How to use mapfragment in a fragment

How to use mapfragment in a fragment - android

Mainly i got a FragmentActivity with a drop down menu that once you choose an item from that menu it makes my private class that extends Fragment to show every time other things on the map it self
Now the problem is that when i make the line inside the fragment class that controls the map :
GoogleMap map = ((MapFragment)getFragmentManager.findFragmentById(R.id.map)).getMap()
It says you cant cast fragment to MapFragment so i tried to extend the MapFragment for the class but when i choose an item inside the dropdown menu i do this section of the code :
Fragment fragment = new MyFragmentClass()();
Bundle args = new Bundle();
args.putInt(PlacesFinder.ARG_SECTION_NUMBER, position + 1);
fragment.setArguments(args);
getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment).commit();
i can only use fragment so how can i use the google map inside the fragment if i cant findview it inside the fragment class and cant extends mapfragment because of the dropdown menu?
Thanks head up :)

You can use a GoogleMap inside a fragment. Looking at just the part of your code that creates the fragment in XML there are errors. Assuming this fragment is the only element in your XML layout this is how it should read:
<fragment xmlns:android="schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment"/>
The last line of your XML, where you have android:name is wrong. You code adding the map within the activity should work
GoogleMap map = ((MapFragment)getFragmentManager.findFragmentById(R.id.map)).getMap();
I have used this code below with no problems before
mapFrag = ((SupportMapFragment) getFragmenManager().findFragmenById(R.id.map)).getMap();
The only difference is (1) I was using a SupportMapFragment; (2) I declared my GoogleMap outside of onCreate.
It sounds to be based on what you're describing with the fragment not being able to be cast to the right class that this is an issue either with the error in the fragment XML or you are not using the right imports. If you are using MapFragment then you need make sure you're using the MapFragment import (not SupportMapFragment or just Fragment).
As to the last part of you're code I'm not sure what the relationship with the dropdown menu is. It looks like you're passing arguments to a fragment? If you can provide more details I will comment on that as well.

Sorry for the delay but This is the main activity:
public class MainActivity extends FragmentActivity implements
ActionBar.OnNavigationListener , LocationListener{
private String [] types;
private ActionBar actionBar;
public static GoogleMap map = null;
public static boolean googlePlayOn = false;
private static final String STATE_SELECTED_NAVIGATION_ITEM = "selected_navigation_item";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
types = getResources().getStringArray(R.array.values);
googlePlayOn = isGooglePlay();
actionBar = getActionBar();
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
// Set up the dropdown list navigation in the action bar.
actionBar.setListNavigationCallbacks(
// Specify a SpinnerAdapter to populate the dropdown list.
new ArrayAdapter<String>(getActionBarThemedContextCompat(),android.R.layout.simple_list_item_1,android.R.id.text1, types), this);
}
/**
* This function checks in the phone operating system that
* the phone got google play services
* #return
*/
private boolean isGooglePlay()
{
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if(status == ConnectionResult.SUCCESS)
return true;
else
((Dialog) GooglePlayServicesUtil.getErrorDialog(status, this, 10)).show();
return false;
}
#TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
private Context getActionBarThemedContextCompat() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
return getActionBar().getThemedContext();
} else {
return this;
}
}
#Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
// Restore the previously serialized current dropdown position.
if (savedInstanceState.containsKey(STATE_SELECTED_NAVIGATION_ITEM)) {
getActionBar().setSelectedNavigationItem(
savedInstanceState.getInt(STATE_SELECTED_NAVIGATION_ITEM));
}
}
#Override
public void onSaveInstanceState(Bundle outState) {
// Serialize the current dropdown position.
outState.putInt(STATE_SELECTED_NAVIGATION_ITEM, getActionBar()
.getSelectedNavigationIndex());
}
#Override
public boolean onNavigationItemSelected(int position, long id) {
// When the given dropdown item is selected, show its contents in the
// container view.
if(position != PlacesFinder.currentTitle)
{
if(!PlacesFinder.created)
{
PlacesFinder.created = true;
Bundle b = new Bundle();
b.putInt(PlacesFinder.ARG_SECTION_NUMBER, position);
Fragment fragment = new PlacesFinder();
fragment.setArguments(b);
getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment).commit();
}
PlacesFinder.newTitleBeenChosenHandler.sendEmptyMessage(0);
}
return true;
}
/**
* A dummy fragment representing a section of the app, but that simply
* displays dummy text.
*/
public static class PlacesFinder extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
public static boolean created = false;
public static final String ARG_SECTION_NUMBER = "section_number";
public static Handler newTitleBeenChosenHandler;
public static int currentTitle = 0;
private Context context;
public PlacesFinder() {
this.context = getActivity();
loadMapFragment();
}
private void loadMapFragment()
{
if(googlePlayOn)
{
if(map == null)
map = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.places_fragment, container , false);
}
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
}
This is the main xml file :
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
tools:ignore="MergeRootFrame" />
This is the mapfragment file :
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.MapFragment"/>
Once i do the line of code
map = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
the apps fails and it says i got a null pointer and i dont have a clue why...

You should use getSupportFragmentManager().
map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
As you're using FragmentActivity, this should work. I'm facing the same problem although I'm using Fragment and that won't do it :(

Related

binary xml file line #0 error when inflating the layout [duplicate]

I have an application with three tabs.
Each tab has its own layout .xml file. The main.xml has its own map fragment. It's the one that shows up when the application first launches.
Everything works fine except for when I change between tabs. If I try to switch back to the map fragment tab, I get this error. Switching to and between other tabs works just fine.
What could be wrong here?
This is my main class and my main.xml, as well as a relevant class that I use ( you will also find the error log at the bottom )
main class
package com.nfc.demo;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.widget.Toast;
public class NFCDemoActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActionBar bar = getActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
bar.addTab(bar
.newTab()
.setText("Map")
.setTabListener(
new TabListener<MapFragment>(this, "map",
MapFragment.class)));
bar.addTab(bar
.newTab()
.setText("Settings")
.setTabListener(
new TabListener<SettingsFragment>(this, "settings",
SettingsFragment.class)));
bar.addTab(bar
.newTab()
.setText("About")
.setTabListener(
new TabListener<AboutFragment>(this, "about",
AboutFragment.class)));
if (savedInstanceState != null) {
bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
}
// setContentView(R.layout.main);
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
}
public static class TabListener<T extends Fragment> implements
ActionBar.TabListener {
private final Activity mActivity;
private final String mTag;
private final Class<T> mClass;
private final Bundle mArgs;
private Fragment mFragment;
public TabListener(Activity activity, String tag, Class<T> clz) {
this(activity, tag, clz, null);
}
public TabListener(Activity activity, String tag, Class<T> clz,
Bundle args) {
mActivity = activity;
mTag = tag;
mClass = clz;
mArgs = args;
// Check to see if we already have a fragment for this tab,
// probably from a previously saved state. If so, deactivate
// it, because our initial state is that a tab isn't shown.
mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
if (mFragment != null && !mFragment.isDetached()) {
FragmentTransaction ft = mActivity.getFragmentManager()
.beginTransaction();
ft.detach(mFragment);
ft.commit();
}
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
if (mFragment == null) {
mFragment = Fragment.instantiate(mActivity, mClass.getName(),
mArgs);
ft.add(android.R.id.content, mFragment, mTag);
} else {
ft.attach(mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
Toast.makeText(mActivity, "Reselected!", Toast.LENGTH_SHORT)
.show();
}
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapFragment"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
relevant class ( MapFragment.java )
package com.nfc.demo;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MapFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
return inflater.inflate(R.layout.main, container, false);
}
public void onDestroy() {
super.onDestroy();
}
}
error
android.view.InflateException: Binary XML file line #7:
Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at com.nfc.demo.MapFragment.onCreateView(MapFragment.java:15)
at android.app.Fragment.performCreateView(Fragment.java:1695)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:885)
at android.app.FragmentManagerImpl.attachFragment(FragmentManager.java:1255)
at android.app.BackStackRecord.run(BackStackRecord.java:672)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException:
Binary XML file line #7: Duplicate id 0x7f040005, tag null, or
parent id 0xffffffff with another fragment for
com.google.android.gms.maps.MapFragment
at android.app.Activity.onCreateView(Activity.java:4722)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
... 19 more

The answer Matt suggests works, but it causes the map to be recreated and redrawn, which isn't always desirable.
After lots of trial and error, I found a solution that works for me:
private static View view;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null)
parent.removeView(view);
}
try {
view = inflater.inflate(R.layout.map, container, false);
} catch (InflateException e) {
/* map is already there, just return view as it is */
}
return view;
}
For good measure, here's "map.xml" (R.layout.map) with R.id.mapFragment (android:id="#+id/mapFragment"):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</LinearLayout>
I hope this helps, but I can't guarantee that it doesn't have any adverse effects.
Edit: There were some adverse effects, such as when exiting the application and starting it again. Since the application isn't necessarily completely shut down (but just put to sleep in the background), the previous code i submitted would fail upon restarting the application. I've updated the code to something that works for me, both going in & out of the map and exiting and restarting the application, I'm not too happy with the try-catch bit, but it seem to work well enough. When looking at the stack trace it occurred to me that I could just check if the map fragment is in the FragmentManager, no need for the try-catch block, code updated.
More edits: It turns out that you need that try-catch after all. Just checking for the map fragment turned out not to work so well after all. Blergh.

The problem is that what you are trying to do shouldn't be done. You shouldn't be inflating fragments inside other fragments. From Android's documentation:
Note: You cannot inflate a layout into a fragment when that layout
includes a <fragment>. Nested fragments are only supported when added
to a fragment dynamically.
While you may be able to accomplish the task with the hacks presented here, I highly suggest you don't do it. Its impossible to be sure that these hacks will handle what each new Android OS does when you try to inflate a layout for a fragment containing another fragment.
The only Android-supported way to add a fragment to another fragment is via a transaction from the child fragment manager.
Simply change your XML layout into an empty container (add an ID if needed):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapFragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
Then in the Fragment onViewCreated(View view, #Nullable Bundle savedInstanceState) method:
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
FragmentManager fm = getChildFragmentManager();
SupportMapFragment mapFragment = (SupportMapFragment) fm.findFragmentByTag("mapFragment");
if (mapFragment == null) {
mapFragment = new SupportMapFragment();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.mapFragmentContainer, mapFragment, "mapFragment");
ft.commit();
fm.executePendingTransactions();
}
mapFragment.getMapAsync(callback);
}

I had the same issue and was able to resolve it by manually removing the MapFragment in the onDestroy() method of the Fragment class. Here is code that works and references the MapFragment by ID in the XML:
#Override
public void onDestroyView() {
super.onDestroyView();
MapFragment f = (MapFragment) getFragmentManager()
.findFragmentById(R.id.map);
if (f != null)
getFragmentManager().beginTransaction().remove(f).commit();
}
If you don't remove the MapFragment manually, it will hang around so that it doesn't cost a lot of resources to recreate/show the map view again. It seems that keeping the underlying MapView is great for switching back and forth between tabs, but when used in fragments this behavior causes a duplicate MapView to be created upon each new MapFragment with the same ID. The solution is to manually remove the MapFragment and thus recreate the underlying map each time the fragment is inflated.
I also noted this in another answer [1].

This is my answer:
1, Create a layout xml like following:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
2, in the Fragment class, add a google map programmatically.
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {#link android.support.v4.app.Fragment} subclass. Activities that
* contain this fragment must implement the
* {#link MapFragment.OnFragmentInteractionListener} interface to handle
* interaction events. Use the {#link MapFragment#newInstance} factory method to
* create an instance of this fragment.
*
*/
public class MapFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
private GoogleMap mMap;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_map, container, false);
SupportMapFragment mMapFragment = SupportMapFragment.newInstance();
mMap = mMapFragment.getMap();
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.add(R.id.map_container, mMapFragment).commit();
return view;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
Log.d("Attach", "on attach");
}
#Override
public void onDetach() {
super.onDetach();
}
}

As mentioned by #Justin Breitfeller, #Vidar Wahlberg solution is a hack which might not work in future version of Android.
#Vidar Wahlberg perfer a hack because other solution might "cause the map to be recreated and redrawn, which isn't always desirable". Map redraw could be prevented by maintaining the old map fragment, rather than creating a new instance every time.
#Matt solution doesn't work for me (IllegalStateException)
As quoted by #Justin Breitfeller, "You cannot inflate a layout into a fragment when that layout includes a . Nested fragments are only supported when added to a fragment dynamically."
My solution:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_map_list, container, false);
// init
//mapFragment = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map);
// don't recreate fragment everytime ensure last map location/state are maintain
if (mapFragment == null) {
mapFragment = SupportMapFragment.newInstance();
mapFragment.getMapAsync(this);
}
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
// R.id.map is a layout
transaction.replace(R.id.map, mapFragment).commit();
return view;
}

Declare SupportMapFragment object globally
private SupportMapFragment mapFragment;
In onCreateView() method put below code
mapFragment = (SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
In onDestroyView() put below code
#Override
public void onDestroyView() {
super.onDestroyView();
if (mapFragment != null)
getFragmentManager().beginTransaction().remove(mapFragment).commit();
}
In your xml file put below code
<fragment
android:id="#+id/map"
android:name="com.abc.Driver.fragment.FragmentHome"
class="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
Above code solved my problem and it's working fine

I would recommend replace() rather than attach()/detach() in your tab handling.
Or, switch to ViewPager. Here is a sample project showing a ViewPager, with tabs, hosting 10 maps.

Another solution:
if (view == null) {
view = inflater.inflate(R.layout.nearbyplaces, container, false);
}
That's it, if not null you don't need to reinitialize it removing from parent is unnecessary step.

You are returning or inflating layout twice, just check to see if you only inflate once.

I have lost hours today to find the reason, fortunately this issue is not because of MapFragment implementation, fnfortunately, this does not work because nested fragments are only supported through support library from rev 11.
My implementation has an activity with actionbar (in tabbed mode) with two tabs (no viewpager), one having the map and the other having a list of entries. Of course I've been quite naive to use MapFragment inside my tab-fragments, et voila the app crashed everytime I switched back to map-tab.
( The same issue I also would have in case my tab-fragment would inflate any layout containing any other fragment ).
One option is to use the MapView (instead of MapFragment), with some overhead though ( see MapView Docs as drop-in replacement in the layout.xml, another option is to use support-library up from rev. 11 but then take programmatic approach since nested fragments are neither supported via layout. Or just working around programmatically by explicitely destroying the fragment (like in the answer from Matt / Vidar), btw: same effect is achieved using the MapView (option 1).
But actually, I did not want to loose the map everytime I tab away, that is, I wanted to keep it in memory and cleanup only upon activity close, so I decided to simply hide/show the map while tabbing, see FragmentTransaction / hide

For those who are still running into this issue, the best way to make sure you don't get this error with a Map in a Tab is to make the Fragment extend SupportMapFragment instead of nesting a SupportMapFragment inside the Fragment used for the Tab.
I just got this working using a ViewPager with a FragmentPagerAdapter, with the SupportMapFragment in the third Tab.
Here is the general structure, note there is no need to override the onCreateView() method, and there is no need to inflate any layout xml:
public class MapTabFragment extends SupportMapFragment
implements OnMapReadyCallback {
private GoogleMap mMap;
private Marker marker;
public MapTabFragment() {
}
#Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
getMapAsync(this);
}
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
setUpMap();
}
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.getUiSettings().setMapToolbarEnabled(false);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng point) {
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
//place marker where user just clicked
marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));
}
});
}
}
Result:
Here is the full class code that I used to test with, which includes the placeholder Fragment used for the first two Tabs, and the Map Fragment used for the third Tab:
public class MainActivity extends AppCompatActivity implements ActionBar.TabListener{
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
final ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return PlaceholderFragment.newInstance(position + 1);
case 1:
return PlaceholderFragment.newInstance(position + 1);
case 2:
return MapTabFragment.newInstance(position + 1);
}
return null;
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
TextView text;
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
text = (TextView) rootView.findViewById(R.id.section_label);
text.setText("placeholder");
return rootView;
}
}
public static class MapTabFragment extends SupportMapFragment implements
OnMapReadyCallback {
private static final String ARG_SECTION_NUMBER = "section_number";
private GoogleMap mMap;
private Marker marker;
public static MapTabFragment newInstance(int sectionNumber) {
MapTabFragment fragment = new MapTabFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public MapTabFragment() {
}
#Override
public void onResume() {
super.onResume();
Log.d("MyMap", "onResume");
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
Log.d("MyMap", "setUpMapIfNeeded");
getMapAsync(this);
}
}
#Override
public void onMapReady(GoogleMap googleMap) {
Log.d("MyMap", "onMapReady");
mMap = googleMap;
setUpMap();
}
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.getUiSettings().setMapToolbarEnabled(false);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng point) {
Log.d("MyMap", "MapClick");
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
//place marker where user just clicked
marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));
Log.d("MyMap", "MapClick After Add Marker");
}
});
}
}
}

I respect all the answers but i found this one liner solution:
If n Is the Number of tabs then:
mViewPager.setOffscreenPageLimit(n);
Example:
In case mentioned :
mViewPager.setOffscreenPageLimit(2);
View pager implements a queue so, you don't have to let it remove that fragment. onCreateView is called only once.

I am a bit late to the party but Non of these answer helped me in my case. I was using Google map as SupportMapFragment and PlaceAutocompleteFragment both in my fragment. As all the answers pointed to the fact that the problem is with SupportMapFragment being the map to be recreated and redrawn.But after digging found out my problem was actually with PlaceAutocompleteFragment
So here is the working solution for those who are facing this problem because of SupportMapFragment and SupportMapFragment
//Global SupportMapFragment mapFragment;
mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.mapFragment);
FragmentManager fm = getChildFragmentManager();
if (mapFragment == null) {
mapFragment = SupportMapFragment.newInstance();
fm.beginTransaction().replace(R.id.mapFragment, mapFragment).commit();
fm.executePendingTransactions();
}
mapFragment.getMapAsync(this);
//Global PlaceAutocompleteFragment autocompleteFragment;
if (autocompleteFragment == null) {
autocompleteFragment = (PlaceAutocompleteFragment) getActivity().getFragmentManager().findFragmentById(R.id.place_autoCompleteFragment);
}
And in onDestroyView clear the SupportMapFragment and SupportMapFragment
#Override
public void onDestroyView() {
super.onDestroyView();
if (getActivity() != null) {
Log.e("res","place dlted");
android.app.FragmentManager fragmentManager = getActivity().getFragmentManager();
android.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.remove(autocompleteFragment);
fragmentTransaction.commit();
//Use commitAllowingStateLoss() if getting exception
autocompleteFragment = null;
}
}

Nested fragments are not currently supported.
Try Support Package, revision 11.

Have you been trying to reference your custom MapFragment class in the layout file?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapFragment"
android:name="com.nfc.demo.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

If you will use only Vidar Wahlberg answer, you get error when you open other activity (for example) and back to map. Or in my case open other activity and then from new activity open map again( without use back button).
But when you combine Vidar Wahlberg solution and Matt solution you will have not exceptions.
layout
<com.example.ui.layout.MapWrapperLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/map_relative_layout">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/root">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
</<com.example.ui.layout.MapWrapperLayout>
Fragment
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
setHasOptionsMenu(true);
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null){
parent.removeView(view);
}
}
try {
view = inflater.inflate(R.layout.map_view, null);
if(view!=null){
ViewGroup root = (ViewGroup) view.findViewById(R.id.root);
...
#Override
public void onDestroyView() {
super.onDestroyView();
Fragment fragment = this.getSherlockActivity().getSupportFragmentManager().findFragmentById(R.id.map);
if (fragment != null)
getFragmentManager().beginTransaction().remove(fragment).commit();
}

I had this in viewPager and the crash was because any fragment had to have its own tag, duplicate tags or ids for same fragment are not allowed.

I think there was some bugs in previous App-Compat lib for child Fragment. I tried #Vidar Wahlberg and #Matt's ans they did not work for me. After updating the appcompat library my code run perfectly without any extra effort.

Things to Note here is your app will crash badly in either of two cases:-
1) In order to reuse fragment with Maps again MapView Fragment must be removed when
your fragment showing Maps got replaced with other fragment in onDestroyView callback.
else when you try to inflate same fragment twice Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragment error will happen.
2) Secondly you must not mix app.Fragment operations with
android.support.v4.app.Fragment API operations eg.do not use
android.app.FragmentTransaction to remove v4.app.Fragment type
MapView Fragment. Mixing this will again result into crash from fragment side.
Here is sample code snippet for correct usage of MapView
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.serveroverload.yago.R;
/**
* #author 663918
*
*/
public class HomeFragment extends Fragment implements LocationListener {
// Class to do operations on the Map
GoogleMap googleMap;
private LocationManager locationManager;
public static Fragment newInstance() {
return new HomeFragment();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.home_fragment, container, false);
Bundle bdl = getArguments();
// setuping locatiomanager to perfrom location related operations
locationManager = (LocationManager) getActivity().getSystemService(
Context.LOCATION_SERVICE);
// Requesting locationmanager for location updates
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 1, 1, this);
// To get map from MapFragment from layout
googleMap = ((MapFragment) getActivity().getFragmentManager()
.findFragmentById(R.id.map)).getMap();
// To change the map type to Satellite
// googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
// To show our current location in the map with dot
// googleMap.setMyLocationEnabled(true);
// To listen action whenever we click on the map
googleMap.setOnMapClickListener(new OnMapClickListener() {
#Override
public void onMapClick(LatLng latLng) {
/*
* LatLng:Class will give us selected position lattigude and
* longitude values
*/
Toast.makeText(getActivity(), latLng.toString(),
Toast.LENGTH_LONG).show();
}
});
changeMapMode(2);
// googleMap.setSatellite(true);
googleMap.setTrafficEnabled(true);
googleMap.setBuildingsEnabled(true);
googleMap.setMyLocationEnabled(true);
return v;
}
private void doZoom() {
if (googleMap != null) {
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(18.520430, 73.856744), 17));
}
}
private void changeMapMode(int mapMode) {
if (googleMap != null) {
switch (mapMode) {
case 0:
googleMap.setMapType(GoogleMap.MAP_TYPE_NONE);
break;
case 1:
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
break;
case 2:
googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
break;
case 3:
googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
break;
case 4:
googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
break;
default:
break;
}
}
}
private void createMarker(double latitude, double longitude) {
// double latitude = 17.385044;
// double longitude = 78.486671;
// lets place some 10 random markers
for (int i = 0; i < 10; i++) {
// random latitude and logitude
double[] randomLocation = createRandLocation(latitude, longitude);
// Adding a marker
MarkerOptions marker = new MarkerOptions().position(
new LatLng(randomLocation[0], randomLocation[1])).title(
"Hello Maps " + i);
Log.e("Random", "> " + randomLocation[0] + ", " + randomLocation[1]);
// changing marker color
if (i == 0)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
if (i == 1)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
if (i == 2)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_CYAN));
if (i == 3)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
if (i == 4)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
if (i == 5)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE));
if (i == 6)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED));
if (i == 7)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
if (i == 8)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_VIOLET));
if (i == 9)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_YELLOW));
googleMap.addMarker(marker);
// Move the camera to last position with a zoom level
if (i == 9) {
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(randomLocation[0], randomLocation[1]))
.zoom(15).build();
googleMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
}
}
}
/*
* creating random postion around a location for testing purpose only
*/
private double[] createRandLocation(double latitude, double longitude) {
return new double[] { latitude + ((Math.random() - 0.5) / 500),
longitude + ((Math.random() - 0.5) / 500),
150 + ((Math.random() - 0.5) * 10) };
}
#Override
public void onLocationChanged(Location location) {
if (null != googleMap) {
// To get lattitude value from location object
double latti = location.getLatitude();
// To get longitude value from location object
double longi = location.getLongitude();
// To hold lattitude and longitude values
LatLng position = new LatLng(latti, longi);
createMarker(latti, longi);
// Creating object to pass our current location to the map
MarkerOptions markerOptions = new MarkerOptions();
// To store current location in the markeroptions object
markerOptions.position(position);
// Zooming to our current location with zoom level 17.0f
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(position,
17f));
// adding markeroptions class object to the map to show our current
// location in the map with help of default marker
googleMap.addMarker(markerOptions);
}
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onDestroyView() {
// TODO Auto-generated method stub
super.onDestroyView();
locationManager.removeUpdates(this);
android.app.Fragment fragment = getActivity().getFragmentManager()
.findFragmentById(R.id.map);
if (null != fragment) {
android.app.FragmentTransaction ft = getActivity()
.getFragmentManager().beginTransaction();
ft.remove(fragment);
ft.commit();
}
}
}
XML
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
Result looks like this :-
Hope it will help Somebody.

In this solution you do not need to take static variable;
Button nextBtn;
private SupportMapFragment mMapFragment;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
if (mRootView != null) {
ViewGroup parent = (ViewGroup) mRootView.getParent();
Utility.log(0,"removeView","mRootView not NULL");
if (parent != null) {
Utility.log(0, "removeView", "view removeViewed");
parent.removeAllViews();
}
}
else {
try {
mRootView = inflater.inflate(R.layout.dummy_fragment_layout_one, container, false);//
} catch (InflateException e) {
/* map is already there, just return view as it is */
e.printStackTrace();
}
}
return mRootView;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
FragmentManager fm = getChildFragmentManager();
SupportMapFragment mapFragment = (SupportMapFragment) fm.findFragmentById(R.id.mapView);
if (mapFragment == null) {
mapFragment = new SupportMapFragment();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.mapView, mapFragment, "mapFragment");
ft.commit();
fm.executePendingTransactions();
}
//mapFragment.getMapAsync(this);
nextBtn = (Button) view.findViewById(R.id.nextBtn);
nextBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Utility.replaceSupportFragment(getActivity(),R.id.dummyFragment,dummyFragment_2.class.getSimpleName(),null,new dummyFragment_2());
}
});
}`

Try setting an id (android:id="#+id/maps_dialog") for your mapView parent layout. Works for me.

Anyone coming here now that's getting this type of error when opening a Dialog or other Fragment with the Google Places AutocompleteSupportFragment, try this one-liner (I don't know how safe this is but it works for me):
autocompleteFragment.getFragmentManager().beginTransaction().remove(autocompleteFragment).commit();
before you dismiss/destroy your fragment.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.google.android.gms.maps.MapView
android:id="#+id/mapview"
android:layout_width="100dip"
android:layout_height="100dip"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/textView1"
android:layout_marginRight="15dp" >
</com.google.android.gms.maps.MapView>
Why don't you insert a map using the MapView object instead of MapFragment ? I am not sure if there is any limitation in MapView,though i found it helpful.

Swiping through unlimited fragments - Confused over ViewPager process

I am trying to create an app that pulls these Ron Swanson quotes from an api and displays them in a fragment. When the fragment is swiped, the app will go to another fragment and display a new quote. This process is supposed to repeat indefinitely.
Instead, the app loads to a blank screen. I have placed a button and TextView on the fragment, each with initial texts to determine if it has loads, but nothing ever appears.
P.S.: you may also notice some comical variable names and comments. I obviously didn't consider that I may need help when writing it (it's just a personal app for learning).
P.P.S.: I'm honestly not certain the site is even still up, but that shouldn't affect anything at this point.
Thanks to anyone who can help. Below is the 1) single java file of the app 2) activity_main.xml file.
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class MainActivity extends FragmentActivity {
#SuppressWarnings("deprecation")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//
ViewPager pagingRon = (ViewPager) findViewById(R.id.pager);
PagerAdapter RonsPagerAdapter = new CustomPagerAdapter(getSupportFragmentManager());
pagingRon.setAdapter(RonsPagerAdapter);
pagingRon.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrollStateChanged(int arg0) {
// TOxDO Auto-generated method stub
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
#Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
}
});
//Initial AsyncTask for setting up first quote of the Great Swan
RonSwanSetup ronSwansonOG = new RonSwanSetup();
ronSwansonOG.execute();
}
private class RonSwanSetup extends AsyncTask<Void, String, Void> {
#Override
protected Void doInBackground(Void... Socialism) {
String Ronquoteson = ""; //Ron's wonderful first quote
String Rondotcom = "http://ron-swanson-quotes.herokuapp.com/quotes"; //the website for fetching Ron's wonderful quotes
String[] Ronsquotes = new String[1]; //Ron only speaks seldomly, which is the pinnacle of wisdom
try {
URL Ronsurl = new URL(Rondotcom);
HttpURLConnection Ronsconnection = (HttpURLConnection) Ronsurl.openConnection();
BufferedReader thanksRon = new BufferedReader(new InputStreamReader(Ronsconnection.getInputStream()));
String current;
while((current = thanksRon.readLine()) != null)
{
Ronquoteson += current;
}
Ronsquotes[0] = Ronquoteson;
} catch (Exception sorryRon) {
Ronsquotes[0] = "The app appears unable to do even the SIMPLEST THINGS CORRECTLY - Maybe try restarting it?";
sorryRon.printStackTrace();
}
publishProgress(Ronsquotes);
return null;
}
protected void onProgressUpdate(String... Ronsquote) {
TextView RonsText = (TextView) findViewById(R.id.text);
String RonQouteson = Ronsquote[0];
RonsText.setText("Not Ron's Quote");//For testing
}
}
public class CustomPagerAdapter extends FragmentPagerAdapter {
public CustomPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
// This method returns the fragment associated with
// the specified position.
// It is called when the Adapter needs a fragment
// and it does not exist.
public Fragment getItem(int position) {
// Create fragment object
RonFragSon fragment = new RonFragSon();
// Attach some data to it that we'll
// use to populate our fragment layouts
Bundle args = new Bundle();
args.putInt("page_position", position + 1);
// Set the arguments on the fragment
// that will be fetched
fragment.setArguments(args);
return fragment;
}
#Override
public int getCount() {
return 3;
}
}
public class RonFragSon extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout resource that'll be returned
View rootView = inflater.inflate(R.layout.swansons_fragment, container, false);
// Get the arguments that was supplied when
// the fragment was instantiated in the
// CustomPagerAdapter
Bundle args = getArguments();
((TextView) rootView.findViewById(R.id.text)).setText("Page");
return rootView;
}
}
}
<HorizontalScrollView
android:id="#+id/horizontal_Swangrid"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="40"
xmlns:android="http://schemas.android.com/apk/res/android">
<!-- I don't think this is necessary, but don't want to get rid of it in case I'm wrong
<LinearLayout
android:id="#+id/Swanson_cant_container"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal" >
<TextView
android:id="#+id/RonSwan1stQuote"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/RonSwan2ndQuote"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="#+id/RonSwan3rdQuote"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
-->
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</HorizontalScrollView>

WebView with FragmentStatePagerAdapter goes blank on calling setCurrentItem

I am working on Swipe Views with Tabs. The code provided in the "EffectiveNavigation" project at the Creating Swipe Views with Tabs page provides a solid starting ground. Experimenting further I added an OnClickListener to the given TextView and added a setCurrentItem to the onClick method. This behaves as expected and the ViewPager jumps to the requested page.
/**
* A dummy fragment representing a section of the app, but that simply displays dummy text.
*/
public static class DemoObjectFragment extends Fragment {
public static final String ARG_OBJECT = "object";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_collection_object, container, false);
Bundle args = getArguments();
((TextView) rootView.findViewById(android.R.id.text1)).setText(
Integer.toString(args.getInt(ARG_OBJECT)));
((TextView) rootView.findViewById(android.R.id.text1)).setOnClickListener(new OnClickListener() {
public void onClick(View v) {
/*
*setCurrentPagerItem(5); -> omitted here to reduce complexity
*/
mViewPager.setCurrentItem(5);
}
});
return rootView;
}
}
As the project I'm working on requires the loading of static webpages instead of text. I replaced the TextView with a WebView to load a different webpage at every swipe. This works perfectly well. Click events from the HTML side are handled by a JavascriptInterface I have implemented.
It is here that I'm facing a problem. The setCurrentPagerItem method works perfectly well when called outside of the JavascriptInterface. When called from within the JavascriptInterface the WebView shows a blank screen and stays so until a swipe to the right or left is made. A swipe to the right displays the next page to the one requested and a swipe to the left displays the requested page. LogCat shows no errors and this behaviour is consistent across a 4.3 based emulator and a Nexus 7 running 4.4.4. I shall provide the entire code below.
public class CollectionDemoActivity extends FragmentActivity {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide fragments representing
* each object in a collection. We use a {#link android.support.v4.app.FragmentStatePagerAdapter}
* derivative, which will destroy and re-create fragments as needed, saving and restoring their
* state in the process. This is important to conserve memory and is a best practice when
* allowing navigation between objects in a potentially large collection.
*/
DemoCollectionPagerAdapter mDemoCollectionPagerAdapter;
/**
* The {#link android.support.v4.view.ViewPager} that will display the object collection.
*/
ViewPager mViewPager;
private static Context context;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_collection_demo);
context = this;
// Create an adapter that when requested, will return a fragment representing an object in
// the collection.
//
// ViewPager and its adapters use support library fragments, so we must use
// getSupportFragmentManager.
mDemoCollectionPagerAdapter = new DemoCollectionPagerAdapter(getSupportFragmentManager());
// Set up action bar.
final ActionBar actionBar = getActionBar();
// Specify that the Home button should show an "Up" caret, indicating that touching the
// button will take the user one step up in the application's hierarchy.
actionBar.setDisplayHomeAsUpEnabled(true);
final OnPageChangeListener mPageChangeListener = new OnPageChangeListener() {
#Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
#Override
public void onPageSelected(int pos) {
final Toast pageNo;
pageNo = Toast.makeText(context,"PAGE "+(Integer.toString(pos+1))+"/100",Toast.LENGTH_SHORT);
pageNo.show();
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
pageNo.cancel();
}
}, 100);
}
};
// Set up the ViewPager, attaching the adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mDemoCollectionPagerAdapter);
mViewPager.setOnPageChangeListener(mPageChangeListener);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This is called when the Home (Up) button is pressed in the action bar.
// Create a simple intent that starts the hierarchical parent activity and
// use NavUtils in the Support Package to ensure proper handling of Up.
Intent upIntent = new Intent(this, MainActivity.class);
if (NavUtils.shouldUpRecreateTask(this, upIntent)) {
// This activity is not part of the application's task, so create a new task
// with a synthesized back stack.
TaskStackBuilder.from(this)
// If there are ancestor activities, they should be added here.
.addNextIntent(upIntent)
.startActivities();
finish();
} else {
// This activity is part of the application's task, so simply
// navigate up to the hierarchical parent activity.
NavUtils.navigateUpTo(this, upIntent);
}
return true;
}
return super.onOptionsItemSelected(item);
}
private void setCurrentPagerItem(int item) {
mViewPager.setCurrentItem(item);
}
/**
* A {#link android.support.v4.app.FragmentStatePagerAdapter} that returns a fragment
* representing an object in the collection.
*/
public static class DemoCollectionPagerAdapter extends FragmentStatePagerAdapter {
public DemoCollectionPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int i) {
Fragment fragment = new DemoObjectFragment();
Bundle args = new Bundle();
args.putInt(DemoObjectFragment.ARG_OBJECT, i + 1); // Our object is just an integer :-P
fragment.setArguments(args);
return fragment;
}
#Override
public int getCount() {
// For this contrived example, we have a 100-object collection.
return 100;
}
#Override
public CharSequence getPageTitle(int position) {
return "OBJECT " + (position + 1);
}
}
/**
* A dummy fragment representing a section of the app, but that simply displays dummy text.
*/
public static class DemoObjectFragment extends Fragment {
public static final String ARG_OBJECT = "object";
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_collection_object, container, false);
Bundle args = getArguments();
final WebView webView = (WebView) rootView.findViewById(R.id.webView);
switch(args.getInt(ARG_OBJECT)) {
case 1 :
webView.loadUrl("file:///android_asset/html/index.html");
break;
default :
webView.loadUrl("file:///android_asset/html/page_"+(Integer.toString(args.getInt(ARG_OBJECT)-1))+".html");
break;
}
WebSettings ws = webView.getSettings();
ws.setJavaScriptEnabled(true);
webView.addJavascriptInterface(new Object()
{
#JavascriptInterface
public void toPage(String pageNo) {
((CollectionDemoActivity) getActivity()).setCurrentPagerItem(4);
}
}, "external");
return rootView;
}
}
}

I could be wrong but it sounds like you are not updating on the UIThread.
You could try something like this.
getActivity().runOnUiThread(new Runnable(){
#Override
public void run() {
((CollectionDemoActivity) getActivity()).setCurrentPagerItem(4);
}
});

Google Maps API v2 Custom MapFragment + SimpleFragment

I need to create a simple application which contain
1. Custom MapFragment which can display current location (LocationListener?), two markers, etc.
2. Simple empty Fragments.
The application must not use support v4 (sdk 11+) / FragmentActivity.
Empty fragment.
XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/black" >
</RelativeLayout>
Class:
public class FirstFragment extends Fragment{
public FirstFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.first_fragment, container, false);
return view;
}
}
Map fragment (try to make it singleton).
XML:
<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment"/>
Class
public class ThirdMapFragment extends MapFragment {
public static MapFragment instance;
#Override
public View onCreateView(LayoutInflater arg0, ViewGroup arg1, Bundle arg2) {
View view;
view = arg0.inflate(R.layout.map_fragment, arg1, false);
return view;
}
public static MapFragment getInstance() {
if (instance == null) {
instance = newInstance();
}
// NullPointerException in getMap() ???
// instance.getMap().addMarker(new MarkerOptions().position(new LatLng(41.1, 39)));
return instance;
}
#Override
public void onCreate(Bundle arg0) {
super.onCreate(arg0);
}
}
Main activity:
public class ActivityMain extends Activity implements OnClickListener {
FragmentManager fragmentManager;
FragmentTransaction transaction;
FirstFragment firstFragment;
MapFragment mapFragment;
// Buttons
Button b4;
int i = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
fragmentManager = getFragmentManager();
transaction = fragmentManager.beginTransaction();
b4 = (Button) findViewById(R.id.button4);
b1.setOnClickListener(this);
firstFragment = new FirstFragment();
mapFragment = ThirdMapFragment.getInstance();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
#Override
public void onClick(View v) {
makeTransaction(v.getId());
}
private void makeTransaction(int id) {
i++;
transaction = fragmentManager.beginTransaction();
if (i == 1) {
transaction.replace(R.id.relativeLayout, firstFragment).commit();
} else if (i == 2) {
transaction.replace(R.id.relativeLayout, secondFragment).commit();
} else {
transaction.replace(R.id.relativeLayout, mapFragment).commit();
i = 0;
}
}
}
R.id.relativeLayout - Layout in main.xml
But I do not see the map (empty screen with zoom buttons) and how to make LocationListener? Thx.

if you are using the support library you have to use the SupportMapFragment class and not the MapFragment for the map fragment. your activity should be a FragmentActivity for the support of the library. as well as for the Fragment manager. you have to getSupportFragmentManager().
Take a look at this code:
import com.google.android.gms.common.GooglePlayServicesUtil;
import android.os.Bundle;
import com.google.android.gms.maps.*;
public class Map extends android.support.v4.app.FragmentActivity
{
private GoogleMap map;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext()) == 0)
{
map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
map.setMapType(GoogleMap.MAP_TYPE_HYBRID);
}
}}
If you still don't see a map after you made those changes. Check your API Console that you have turn on the Google Map ANDROID API V2 and not just the Google Map API V2 that could cause the same result as you describe.

the view is not created yet that's why getMap() returns null, map doesn't exist, put your code in onResume

Put in the manifest, the key for android?
For example:
<application
android:icon="#drawable/android"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<meta-data android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyB2s6isdfsghDfgdfdfgDFGDG-yi4-aAYUma0Owc"/>
https://developers.google.com/maps/documentation/android/start

Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragment

I have an application with three tabs.
Each tab has its own layout .xml file. The main.xml has its own map fragment. It's the one that shows up when the application first launches.
Everything works fine except for when I change between tabs. If I try to switch back to the map fragment tab, I get this error. Switching to and between other tabs works just fine.
What could be wrong here?
This is my main class and my main.xml, as well as a relevant class that I use ( you will also find the error log at the bottom )
main class
package com.nfc.demo;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.widget.Toast;
public class NFCDemoActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActionBar bar = getActionBar();
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
bar.addTab(bar
.newTab()
.setText("Map")
.setTabListener(
new TabListener<MapFragment>(this, "map",
MapFragment.class)));
bar.addTab(bar
.newTab()
.setText("Settings")
.setTabListener(
new TabListener<SettingsFragment>(this, "settings",
SettingsFragment.class)));
bar.addTab(bar
.newTab()
.setText("About")
.setTabListener(
new TabListener<AboutFragment>(this, "about",
AboutFragment.class)));
if (savedInstanceState != null) {
bar.setSelectedNavigationItem(savedInstanceState.getInt("tab", 0));
}
// setContentView(R.layout.main);
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("tab", getActionBar().getSelectedNavigationIndex());
}
public static class TabListener<T extends Fragment> implements
ActionBar.TabListener {
private final Activity mActivity;
private final String mTag;
private final Class<T> mClass;
private final Bundle mArgs;
private Fragment mFragment;
public TabListener(Activity activity, String tag, Class<T> clz) {
this(activity, tag, clz, null);
}
public TabListener(Activity activity, String tag, Class<T> clz,
Bundle args) {
mActivity = activity;
mTag = tag;
mClass = clz;
mArgs = args;
// Check to see if we already have a fragment for this tab,
// probably from a previously saved state. If so, deactivate
// it, because our initial state is that a tab isn't shown.
mFragment = mActivity.getFragmentManager().findFragmentByTag(mTag);
if (mFragment != null && !mFragment.isDetached()) {
FragmentTransaction ft = mActivity.getFragmentManager()
.beginTransaction();
ft.detach(mFragment);
ft.commit();
}
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
if (mFragment == null) {
mFragment = Fragment.instantiate(mActivity, mClass.getName(),
mArgs);
ft.add(android.R.id.content, mFragment, mTag);
} else {
ft.attach(mFragment);
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
if (mFragment != null) {
ft.detach(mFragment);
}
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
Toast.makeText(mActivity, "Reselected!", Toast.LENGTH_SHORT)
.show();
}
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapFragment"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
relevant class ( MapFragment.java )
package com.nfc.demo;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class MapFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
return inflater.inflate(R.layout.main, container, false);
}
public void onDestroy() {
super.onDestroy();
}
}
error
android.view.InflateException: Binary XML file line #7:
Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at com.nfc.demo.MapFragment.onCreateView(MapFragment.java:15)
at android.app.Fragment.performCreateView(Fragment.java:1695)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:885)
at android.app.FragmentManagerImpl.attachFragment(FragmentManager.java:1255)
at android.app.BackStackRecord.run(BackStackRecord.java:672)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1435)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:441)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException:
Binary XML file line #7: Duplicate id 0x7f040005, tag null, or
parent id 0xffffffff with another fragment for
com.google.android.gms.maps.MapFragment
at android.app.Activity.onCreateView(Activity.java:4722)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:680)
... 19 more

The answer Matt suggests works, but it causes the map to be recreated and redrawn, which isn't always desirable.
After lots of trial and error, I found a solution that works for me:
private static View view;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null)
parent.removeView(view);
}
try {
view = inflater.inflate(R.layout.map, container, false);
} catch (InflateException e) {
/* map is already there, just return view as it is */
}
return view;
}
For good measure, here's "map.xml" (R.layout.map) with R.id.mapFragment (android:id="#+id/mapFragment"):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</LinearLayout>
I hope this helps, but I can't guarantee that it doesn't have any adverse effects.
Edit: There were some adverse effects, such as when exiting the application and starting it again. Since the application isn't necessarily completely shut down (but just put to sleep in the background), the previous code i submitted would fail upon restarting the application. I've updated the code to something that works for me, both going in & out of the map and exiting and restarting the application, I'm not too happy with the try-catch bit, but it seem to work well enough. When looking at the stack trace it occurred to me that I could just check if the map fragment is in the FragmentManager, no need for the try-catch block, code updated.
More edits: It turns out that you need that try-catch after all. Just checking for the map fragment turned out not to work so well after all. Blergh.

The problem is that what you are trying to do shouldn't be done. You shouldn't be inflating fragments inside other fragments. From Android's documentation:
Note: You cannot inflate a layout into a fragment when that layout
includes a <fragment>. Nested fragments are only supported when added
to a fragment dynamically.
While you may be able to accomplish the task with the hacks presented here, I highly suggest you don't do it. Its impossible to be sure that these hacks will handle what each new Android OS does when you try to inflate a layout for a fragment containing another fragment.
The only Android-supported way to add a fragment to another fragment is via a transaction from the child fragment manager.
Simply change your XML layout into an empty container (add an ID if needed):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapFragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
Then in the Fragment onViewCreated(View view, #Nullable Bundle savedInstanceState) method:
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
FragmentManager fm = getChildFragmentManager();
SupportMapFragment mapFragment = (SupportMapFragment) fm.findFragmentByTag("mapFragment");
if (mapFragment == null) {
mapFragment = new SupportMapFragment();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.mapFragmentContainer, mapFragment, "mapFragment");
ft.commit();
fm.executePendingTransactions();
}
mapFragment.getMapAsync(callback);
}

I had the same issue and was able to resolve it by manually removing the MapFragment in the onDestroy() method of the Fragment class. Here is code that works and references the MapFragment by ID in the XML:
#Override
public void onDestroyView() {
super.onDestroyView();
MapFragment f = (MapFragment) getFragmentManager()
.findFragmentById(R.id.map);
if (f != null)
getFragmentManager().beginTransaction().remove(f).commit();
}
If you don't remove the MapFragment manually, it will hang around so that it doesn't cost a lot of resources to recreate/show the map view again. It seems that keeping the underlying MapView is great for switching back and forth between tabs, but when used in fragments this behavior causes a duplicate MapView to be created upon each new MapFragment with the same ID. The solution is to manually remove the MapFragment and thus recreate the underlying map each time the fragment is inflated.
I also noted this in another answer [1].

This is my answer:
1, Create a layout xml like following:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/map_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
2, in the Fragment class, add a google map programmatically.
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**
* A simple {#link android.support.v4.app.Fragment} subclass. Activities that
* contain this fragment must implement the
* {#link MapFragment.OnFragmentInteractionListener} interface to handle
* interaction events. Use the {#link MapFragment#newInstance} factory method to
* create an instance of this fragment.
*
*/
public class MapFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
private GoogleMap mMap;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_map, container, false);
SupportMapFragment mMapFragment = SupportMapFragment.newInstance();
mMap = mMapFragment.getMap();
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.add(R.id.map_container, mMapFragment).commit();
return view;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
Log.d("Attach", "on attach");
}
#Override
public void onDetach() {
super.onDetach();
}
}

As mentioned by #Justin Breitfeller, #Vidar Wahlberg solution is a hack which might not work in future version of Android.
#Vidar Wahlberg perfer a hack because other solution might "cause the map to be recreated and redrawn, which isn't always desirable". Map redraw could be prevented by maintaining the old map fragment, rather than creating a new instance every time.
#Matt solution doesn't work for me (IllegalStateException)
As quoted by #Justin Breitfeller, "You cannot inflate a layout into a fragment when that layout includes a . Nested fragments are only supported when added to a fragment dynamically."
My solution:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_map_list, container, false);
// init
//mapFragment = (SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map);
// don't recreate fragment everytime ensure last map location/state are maintain
if (mapFragment == null) {
mapFragment = SupportMapFragment.newInstance();
mapFragment.getMapAsync(this);
}
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
// R.id.map is a layout
transaction.replace(R.id.map, mapFragment).commit();
return view;
}

Declare SupportMapFragment object globally
private SupportMapFragment mapFragment;
In onCreateView() method put below code
mapFragment = (SupportMapFragment) getChildFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
In onDestroyView() put below code
#Override
public void onDestroyView() {
super.onDestroyView();
if (mapFragment != null)
getFragmentManager().beginTransaction().remove(mapFragment).commit();
}
In your xml file put below code
<fragment
android:id="#+id/map"
android:name="com.abc.Driver.fragment.FragmentHome"
class="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
Above code solved my problem and it's working fine

I would recommend replace() rather than attach()/detach() in your tab handling.
Or, switch to ViewPager. Here is a sample project showing a ViewPager, with tabs, hosting 10 maps.

Another solution:
if (view == null) {
view = inflater.inflate(R.layout.nearbyplaces, container, false);
}
That's it, if not null you don't need to reinitialize it removing from parent is unnecessary step.

You are returning or inflating layout twice, just check to see if you only inflate once.

I have lost hours today to find the reason, fortunately this issue is not because of MapFragment implementation, fnfortunately, this does not work because nested fragments are only supported through support library from rev 11.
My implementation has an activity with actionbar (in tabbed mode) with two tabs (no viewpager), one having the map and the other having a list of entries. Of course I've been quite naive to use MapFragment inside my tab-fragments, et voila the app crashed everytime I switched back to map-tab.
( The same issue I also would have in case my tab-fragment would inflate any layout containing any other fragment ).
One option is to use the MapView (instead of MapFragment), with some overhead though ( see MapView Docs as drop-in replacement in the layout.xml, another option is to use support-library up from rev. 11 but then take programmatic approach since nested fragments are neither supported via layout. Or just working around programmatically by explicitely destroying the fragment (like in the answer from Matt / Vidar), btw: same effect is achieved using the MapView (option 1).
But actually, I did not want to loose the map everytime I tab away, that is, I wanted to keep it in memory and cleanup only upon activity close, so I decided to simply hide/show the map while tabbing, see FragmentTransaction / hide

For those who are still running into this issue, the best way to make sure you don't get this error with a Map in a Tab is to make the Fragment extend SupportMapFragment instead of nesting a SupportMapFragment inside the Fragment used for the Tab.
I just got this working using a ViewPager with a FragmentPagerAdapter, with the SupportMapFragment in the third Tab.
Here is the general structure, note there is no need to override the onCreateView() method, and there is no need to inflate any layout xml:
public class MapTabFragment extends SupportMapFragment
implements OnMapReadyCallback {
private GoogleMap mMap;
private Marker marker;
public MapTabFragment() {
}
#Override
public void onResume() {
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
getMapAsync(this);
}
}
#Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
setUpMap();
}
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.getUiSettings().setMapToolbarEnabled(false);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng point) {
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
//place marker where user just clicked
marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));
}
});
}
}
Result:
Here is the full class code that I used to test with, which includes the placeholder Fragment used for the first two Tabs, and the Map Fragment used for the third Tab:
public class MainActivity extends AppCompatActivity implements ActionBar.TabListener{
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
final ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++) {
actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return PlaceholderFragment.newInstance(position + 1);
case 1:
return PlaceholderFragment.newInstance(position + 1);
case 2:
return MapTabFragment.newInstance(position + 1);
}
return null;
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
Locale l = Locale.getDefault();
switch (position) {
case 0:
return getString(R.string.title_section1).toUpperCase(l);
case 1:
return getString(R.string.title_section2).toUpperCase(l);
case 2:
return getString(R.string.title_section3).toUpperCase(l);
}
return null;
}
}
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
TextView text;
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
text = (TextView) rootView.findViewById(R.id.section_label);
text.setText("placeholder");
return rootView;
}
}
public static class MapTabFragment extends SupportMapFragment implements
OnMapReadyCallback {
private static final String ARG_SECTION_NUMBER = "section_number";
private GoogleMap mMap;
private Marker marker;
public static MapTabFragment newInstance(int sectionNumber) {
MapTabFragment fragment = new MapTabFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public MapTabFragment() {
}
#Override
public void onResume() {
super.onResume();
Log.d("MyMap", "onResume");
setUpMapIfNeeded();
}
private void setUpMapIfNeeded() {
if (mMap == null) {
Log.d("MyMap", "setUpMapIfNeeded");
getMapAsync(this);
}
}
#Override
public void onMapReady(GoogleMap googleMap) {
Log.d("MyMap", "onMapReady");
mMap = googleMap;
setUpMap();
}
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.getUiSettings().setMapToolbarEnabled(false);
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
#Override
public void onMapClick(LatLng point) {
Log.d("MyMap", "MapClick");
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
//place marker where user just clicked
marker = mMap.addMarker(new MarkerOptions().position(point).title("Marker")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)));
Log.d("MyMap", "MapClick After Add Marker");
}
});
}
}
}

I respect all the answers but i found this one liner solution:
If n Is the Number of tabs then:
mViewPager.setOffscreenPageLimit(n);
Example:
In case mentioned :
mViewPager.setOffscreenPageLimit(2);
View pager implements a queue so, you don't have to let it remove that fragment. onCreateView is called only once.

I am a bit late to the party but Non of these answer helped me in my case. I was using Google map as SupportMapFragment and PlaceAutocompleteFragment both in my fragment. As all the answers pointed to the fact that the problem is with SupportMapFragment being the map to be recreated and redrawn.But after digging found out my problem was actually with PlaceAutocompleteFragment
So here is the working solution for those who are facing this problem because of SupportMapFragment and SupportMapFragment
//Global SupportMapFragment mapFragment;
mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.mapFragment);
FragmentManager fm = getChildFragmentManager();
if (mapFragment == null) {
mapFragment = SupportMapFragment.newInstance();
fm.beginTransaction().replace(R.id.mapFragment, mapFragment).commit();
fm.executePendingTransactions();
}
mapFragment.getMapAsync(this);
//Global PlaceAutocompleteFragment autocompleteFragment;
if (autocompleteFragment == null) {
autocompleteFragment = (PlaceAutocompleteFragment) getActivity().getFragmentManager().findFragmentById(R.id.place_autoCompleteFragment);
}
And in onDestroyView clear the SupportMapFragment and SupportMapFragment
#Override
public void onDestroyView() {
super.onDestroyView();
if (getActivity() != null) {
Log.e("res","place dlted");
android.app.FragmentManager fragmentManager = getActivity().getFragmentManager();
android.app.FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.remove(autocompleteFragment);
fragmentTransaction.commit();
//Use commitAllowingStateLoss() if getting exception
autocompleteFragment = null;
}
}

Nested fragments are not currently supported.
Try Support Package, revision 11.

Have you been trying to reference your custom MapFragment class in the layout file?
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapFragment"
android:name="com.nfc.demo.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>

If you will use only Vidar Wahlberg answer, you get error when you open other activity (for example) and back to map. Or in my case open other activity and then from new activity open map again( without use back button).
But when you combine Vidar Wahlberg solution and Matt solution you will have not exceptions.
layout
<com.example.ui.layout.MapWrapperLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/map_relative_layout">
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/root">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
</<com.example.ui.layout.MapWrapperLayout>
Fragment
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
setHasOptionsMenu(true);
if (view != null) {
ViewGroup parent = (ViewGroup) view.getParent();
if (parent != null){
parent.removeView(view);
}
}
try {
view = inflater.inflate(R.layout.map_view, null);
if(view!=null){
ViewGroup root = (ViewGroup) view.findViewById(R.id.root);
...
#Override
public void onDestroyView() {
super.onDestroyView();
Fragment fragment = this.getSherlockActivity().getSupportFragmentManager().findFragmentById(R.id.map);
if (fragment != null)
getFragmentManager().beginTransaction().remove(fragment).commit();
}

I had this in viewPager and the crash was because any fragment had to have its own tag, duplicate tags or ids for same fragment are not allowed.

I think there was some bugs in previous App-Compat lib for child Fragment. I tried #Vidar Wahlberg and #Matt's ans they did not work for me. After updating the appcompat library my code run perfectly without any extra effort.

Things to Note here is your app will crash badly in either of two cases:-
1) In order to reuse fragment with Maps again MapView Fragment must be removed when
your fragment showing Maps got replaced with other fragment in onDestroyView callback.
else when you try to inflate same fragment twice Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragment error will happen.
2) Secondly you must not mix app.Fragment operations with
android.support.v4.app.Fragment API operations eg.do not use
android.app.FragmentTransaction to remove v4.app.Fragment type
MapView Fragment. Mixing this will again result into crash from fragment side.
Here is sample code snippet for correct usage of MapView
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMapClickListener;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.serveroverload.yago.R;
/**
* #author 663918
*
*/
public class HomeFragment extends Fragment implements LocationListener {
// Class to do operations on the Map
GoogleMap googleMap;
private LocationManager locationManager;
public static Fragment newInstance() {
return new HomeFragment();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.home_fragment, container, false);
Bundle bdl = getArguments();
// setuping locatiomanager to perfrom location related operations
locationManager = (LocationManager) getActivity().getSystemService(
Context.LOCATION_SERVICE);
// Requesting locationmanager for location updates
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 1, 1, this);
// To get map from MapFragment from layout
googleMap = ((MapFragment) getActivity().getFragmentManager()
.findFragmentById(R.id.map)).getMap();
// To change the map type to Satellite
// googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
// To show our current location in the map with dot
// googleMap.setMyLocationEnabled(true);
// To listen action whenever we click on the map
googleMap.setOnMapClickListener(new OnMapClickListener() {
#Override
public void onMapClick(LatLng latLng) {
/*
* LatLng:Class will give us selected position lattigude and
* longitude values
*/
Toast.makeText(getActivity(), latLng.toString(),
Toast.LENGTH_LONG).show();
}
});
changeMapMode(2);
// googleMap.setSatellite(true);
googleMap.setTrafficEnabled(true);
googleMap.setBuildingsEnabled(true);
googleMap.setMyLocationEnabled(true);
return v;
}
private void doZoom() {
if (googleMap != null) {
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(18.520430, 73.856744), 17));
}
}
private void changeMapMode(int mapMode) {
if (googleMap != null) {
switch (mapMode) {
case 0:
googleMap.setMapType(GoogleMap.MAP_TYPE_NONE);
break;
case 1:
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
break;
case 2:
googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
break;
case 3:
googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
break;
case 4:
googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
break;
default:
break;
}
}
}
private void createMarker(double latitude, double longitude) {
// double latitude = 17.385044;
// double longitude = 78.486671;
// lets place some 10 random markers
for (int i = 0; i < 10; i++) {
// random latitude and logitude
double[] randomLocation = createRandLocation(latitude, longitude);
// Adding a marker
MarkerOptions marker = new MarkerOptions().position(
new LatLng(randomLocation[0], randomLocation[1])).title(
"Hello Maps " + i);
Log.e("Random", "> " + randomLocation[0] + ", " + randomLocation[1]);
// changing marker color
if (i == 0)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));
if (i == 1)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
if (i == 2)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_CYAN));
if (i == 3)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
if (i == 4)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
if (i == 5)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE));
if (i == 6)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_RED));
if (i == 7)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
if (i == 8)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_VIOLET));
if (i == 9)
marker.icon(BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_YELLOW));
googleMap.addMarker(marker);
// Move the camera to last position with a zoom level
if (i == 9) {
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(randomLocation[0], randomLocation[1]))
.zoom(15).build();
googleMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
}
}
}
/*
* creating random postion around a location for testing purpose only
*/
private double[] createRandLocation(double latitude, double longitude) {
return new double[] { latitude + ((Math.random() - 0.5) / 500),
longitude + ((Math.random() - 0.5) / 500),
150 + ((Math.random() - 0.5) * 10) };
}
#Override
public void onLocationChanged(Location location) {
if (null != googleMap) {
// To get lattitude value from location object
double latti = location.getLatitude();
// To get longitude value from location object
double longi = location.getLongitude();
// To hold lattitude and longitude values
LatLng position = new LatLng(latti, longi);
createMarker(latti, longi);
// Creating object to pass our current location to the map
MarkerOptions markerOptions = new MarkerOptions();
// To store current location in the markeroptions object
markerOptions.position(position);
// Zooming to our current location with zoom level 17.0f
googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(position,
17f));
// adding markeroptions class object to the map to show our current
// location in the map with help of default marker
googleMap.addMarker(markerOptions);
}
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onDestroyView() {
// TODO Auto-generated method stub
super.onDestroyView();
locationManager.removeUpdates(this);
android.app.Fragment fragment = getActivity().getFragmentManager()
.findFragmentById(R.id.map);
if (null != fragment) {
android.app.FragmentTransaction ft = getActivity()
.getFragmentManager().beginTransaction();
ft.remove(fragment);
ft.commit();
}
}
}
XML
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
Result looks like this :-
Hope it will help Somebody.

In this solution you do not need to take static variable;
Button nextBtn;
private SupportMapFragment mMapFragment;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
if (mRootView != null) {
ViewGroup parent = (ViewGroup) mRootView.getParent();
Utility.log(0,"removeView","mRootView not NULL");
if (parent != null) {
Utility.log(0, "removeView", "view removeViewed");
parent.removeAllViews();
}
}
else {
try {
mRootView = inflater.inflate(R.layout.dummy_fragment_layout_one, container, false);//
} catch (InflateException e) {
/* map is already there, just return view as it is */
e.printStackTrace();
}
}
return mRootView;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
FragmentManager fm = getChildFragmentManager();
SupportMapFragment mapFragment = (SupportMapFragment) fm.findFragmentById(R.id.mapView);
if (mapFragment == null) {
mapFragment = new SupportMapFragment();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.mapView, mapFragment, "mapFragment");
ft.commit();
fm.executePendingTransactions();
}
//mapFragment.getMapAsync(this);
nextBtn = (Button) view.findViewById(R.id.nextBtn);
nextBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Utility.replaceSupportFragment(getActivity(),R.id.dummyFragment,dummyFragment_2.class.getSimpleName(),null,new dummyFragment_2());
}
});
}`

Try setting an id (android:id="#+id/maps_dialog") for your mapView parent layout. Works for me.

Anyone coming here now that's getting this type of error when opening a Dialog or other Fragment with the Google Places AutocompleteSupportFragment, try this one-liner (I don't know how safe this is but it works for me):
autocompleteFragment.getFragmentManager().beginTransaction().remove(autocompleteFragment).commit();
before you dismiss/destroy your fragment.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.google.android.gms.maps.MapView
android:id="#+id/mapview"
android:layout_width="100dip"
android:layout_height="100dip"
android:layout_alignParentTop="true"
android:layout_alignRight="#+id/textView1"
android:layout_marginRight="15dp" >
</com.google.android.gms.maps.MapView>
Why don't you insert a map using the MapView object instead of MapFragment ? I am not sure if there is any limitation in MapView,though i found it helpful.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

How to use mapfragment in a fragment - android

You should use getSupportFragmentManager(). map = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); As you're using FragmentActivity, this should work. I'm facing the same problem although I'm using Fragment and that won't do it :(

Related

binary xml file line #0 error when inflating the layout [duplicate]

Swiping through unlimited fragments - Confused over ViewPager process

WebView with FragmentStatePagerAdapter goes blank on calling setCurrentItem

Google Maps API v2 Custom MapFragment + SimpleFragment

Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragment

Categories

Resources