Develop Reference

Navigation drawer not working on activities using fragments

I've been trying to add a Nav Drawer to my app. I have this MapsActivty which is my main activity.
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
public GoogleMap mMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
#SuppressWarnings("StatementWithEmptyBody")
public void onMapSearch(View view) {
EditText locationSearch = (EditText) findViewById(R.id.editText);
String location = locationSearch.getText().toString();
List<Address> addressList = null;
if (location != null || !location.equals("")) {
Geocoder geocoder = new Geocoder(this);
try {
addressList = geocoder.getFromLocationName(location, 1);
} catch (IOException e) {
e.printStackTrace();
}
Address address = addressList.get(0);
LatLng latLng = new LatLng(address.getLatitude(), address.getLongitude());
mMap.addMarker(new MarkerOptions().position(latLng).title("Marker"));
mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));
}
}
public void onNormalMap(View view) {
mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
}
public void onSatelliteMap(View view) {
mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
}
public void onTerrainMap(View view) {
mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
}
public void onHybridMap(View view) {
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
}
public static double lng;
public static double lat;
#Override
public void onMapReady(final GoogleMap googleMap) {
mMap = googleMap;
Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
Intent intent = new Intent (v.getContext(), RegistroInfo.class);
intent.putExtra("longitud", String.valueOf(lng));
intent.putExtra("latitud", String.valueOf(lat));
startActivityForResult(intent, 0);
} });
//View v;
mMap.setOnMapLongClickListener(new GoogleMap.OnMapLongClickListener() {
#Override
public void onMapLongClick(LatLng point) {
mMap.addMarker(new MarkerOptions().position(point).title("Custom location").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
RegistroInfo regis = new RegistroInfo();
lng = point.longitude;
lat = point.latitude;
}
});
// Add a marker in Sydney and move the camera
LatLng cusco = new LatLng(-13.537733, -71.903838);
mMap.addMarker(new MarkerOptions().position(cusco).title("Cusco, Peru"));
float zoomLevel = 16; //This goes up to 21
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(cusco, zoomLevel));
mMap.moveCamera(CameraUpdateFactory.newLatLng(cusco));
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
{
return;
}
mMap.getUiSettings().setMyLocationButtonEnabled(true);
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(true);
mMap.getUiSettings().setZoomControlsEnabled(true);
mMap.getUiSettings().setIndoorLevelPickerEnabled(true);}}
NOTICE that a use extends FragmentActivityand i saw that i could use extends MenuActivity from my MenuActivity I tried this post [Same Navigation Drawer in different Activities)
From my Menu Activity i have some items, which are the MapsActivity( nav_MenuPrincipal ), PerfilActivity(another activity showing information of current user) nav_perfil, NormalMap(style of map) nav_normal, SatelliteMap(style of map) nav_satellite, TerrainMap(style of map)nav_terrainmap, HybridMap(style of map)nav_hybrid
Here goes the MenuActivity
public class MenuActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_menu);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#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, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_MenuPrincipal) {
startActivity(new Intent(this, MapsActivity.class));
return true;
}
else if (id == R.id.nav_perfil) {
}
else if (id == R.id.nav_suggestions) {
} else if (id == R.id.nav_normalmap) {
} else if (id == R.id.nav_satellitemap) {
} else if (id == R.id.nav_terrainmap) {
} else if (id == R.id.nav_hybridmap) {
} else if (id == R.id.nav_aboutus) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
Notice that I've tried this if (id == R.id.nav_MenuPrincipal) { startActivity(new Intent(this, MapsActivity.class)); return true; }, it works but not showing the menu bar.
For the items called Normal, Satellite, Terrain, Hybridi just want to change the style of the map for the MapsActivity
Now I'm using a LoginActivity which is already connected to a DB on a Hosting, it has the intent filter. Then i want to show my MainActivity (MapsActivity) but with that Menu (NavigationDrawer)
Thank you very much.
Sorry if I'm not very clear, its my first time here

here is your solution
public class MapsActivity extends AppCompatActivity implements
OnMapReadyCallback, NavigationView.OnNavigationItemSelectedListener,
OnClickListener {
private GoogleMap mMap;
private NavigationView mDrawer;
private DrawerLayout mDrawerLayout;
SupportMapFragment mMapFragment;
private ActionBarDrawerToggle mDrawerToggle;
private Button search;
int PLACE_PICKER_REQUEST = 1;
String placeName, address;
private static final float ALPHA_DIM_VALUE = 0.1f;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
mMapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
try {
manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(myIntent);
overridePendingTransition(R.anim.push_up_in,
R.anim.push_up_out);
} else {
mMapFragment.getMapAsync(this);
overridePendingTransition(R.anim.push_up_out,
R.anim.push_up_in);
}
} catch (Exception e) {
e.printStackTrace();
}
setupDrawer();
mDrawerLayout.addDrawerListener(mDrawerToggle);
mDrawerLayout.post(new Runnable() {
#Override
public void run() {
mDrawerToggle.syncState();
}
});
private void showErrorToast() {
Toast.makeText(getApplicationContext(), getApplicationContext().getString(R.string.Toast_Error), Toast.LENGTH_SHORT).show();
}
private void setupDrawer() {
assert getSupportActionBar() != null;
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
mDrawer = (NavigationView) findViewById(R.id.mNavDrawer);
assert mDrawer != null;
mDrawer.setNavigationItemSelectedListener(this);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.string.DrawerOpen,
R.string.DrawerClose) {
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
super.onDrawerOpened(drawerView);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.addDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
}
#Override
public boolean onNavigationItemSelected(MenuItem item) {
Intent intent = null;
if (item.getItemId() == R.id.navigation_item_1) {
mDrawerLayout.closeDrawer(GravityCompat.START);
intent = new Intent(this, LocationList.class);
startActivity(intent);
overridePendingTransition(R.anim.push_up_in,
R.anim.push_up_out);
finish();
return true;
}
if (item.getItemId() == R.id.navigation_item_2) {
mDrawerLayout.closeDrawer(GravityCompat.START);
intent = new Intent(this, MapsActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.push_up_in,
R.anim.push_up_out);
finish();
return true;
}
mDrawerLayout.closeDrawers();
return true;
}
#Override
protected void onPostCreate(#Nullable Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
if (id == android.R.id.home) {
mDrawerLayout.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
}
just copy reliable code.. and have any doubt about Map then ask me.. i have all your solution regarding map.

Passing data from one fragment to another is not working when passing data

I have a fragment fragmentA on which I have a gridview. The user clicks on a row the grid, I read the value of the first column and pass it to another fragment MapFragment. When I run in debug mode, I can see that the data from fragmentA is passed to the main activity and the app crashes.
What is wrong with code? Am I missing anything?
FATAL EXCEPTION: main
java.lang.NullPointerException
at com.text.MainActivity.SendData(MainActivity.java:51)
at com.test.fragmentAFragment$1.onItemClick(BurnScheduleFragment.java:50)
at android.widget.AdapterView.performItemClick(AdapterView.java:301)
at android.widget.AbsListView.performItemClick(AbsListView.java:1539)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3332)
at android.widget.AbsListView$1.run(AbsListView.java:4554)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5279)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(Native Method)
I have an interface as
`public interface Communicate {
public void SendData(String place);
}
In MapFragment
public class MapFragment extends Fragment {
private MapView map;
HashMap markerMap = new HashMap();
Marker marker;
public MapFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle bundle = this.getArguments();
}
public void Show(String title)
{
Marker showMarkerOnMap = (Marker)markerMap.get(title);
showMarkerOnMap.showInfoWindow();
}
private void CreateMarkers(){
GoogleMap gMap = map.getMap();
gMap.setMyLocationEnabled(true);
gMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
marker = gMap.addMarker(new MarkerOptions().title("One")
.snippet("description")
.position(new LatLng( 0, 0)));
markerMap.put("One", marker);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_map, container, false);
if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity().getApplicationContext()) == ConnectionResult.SUCCESS) {
//Initialze mapview
MapsInitializer.initialize(getActivity());
map = (MapView) view.findViewById(R.id.mapView);
map.onCreate(savedInstanceState);
CreateMarkers();
} else {
Toast.makeText(getActivity(), "Please install google play services", Toast.LENGTH_LONG).show();
}
return view;
}
#Override
public void onResume() {
super.onResume();
map.onResume();
}
#Override
public void onPause() {
super.onPause();
map.onPause();
}
#Override
public void onDestroy() {
super.onDestroy();
map.onDestroy();
}
#Override
public void onLowMemory() {
super.onLowMemory();
map.onLowMemory();
}
}
In My MainAcyivity I have
implemented the SendData as
public void SendData(String place)
{
FragmentManager fragmentManager = getSupportFragmentManager();
MapFragment mapFragment = (MapFragment)fragmentManager.findFragmentById(R.id.mapView);
mapFragment.Show(place);
}
and I have added the method Show in the MapFragment
public void Show(String title)
{
Marker showMarkerOnMap = (Marker)markerMap.get(title);
showMarkerOnMap.showInfoWindow();
}
public class MainActivity extends ActionBarActivity
implements NavigationDrawerFragment.NavigationDrawerCallbacks, Communicate {
private NavigationDrawerFragment mNavigationDrawerFragment;
private CharSequence mTitle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getSupportFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
}
public void SendData(String place)
{
FragmentManager fragmentManager = getSupportFragmentManager();
MapFragment mapFragment = (MapFragment)fragmentManager.findFragmentById(R.id.mapView);
mapFragment.Show(place);
}
#Override
public void onNavigationDrawerItemSelected(int position)
{
// update the main content by replacing fragments
Fragment fragment = null;
switch (position){
case 0:
fragment= new MapFragment();
break;
case 1:
fragment = new BFragment();
break;
case 2:
break;
default:
fragment = new AFragment();
break;
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, fragment)
.commit();
}
public void onSectionAttached(int number) {
switch (number) {
case 1:
mTitle = getString(R.string.title_section1);
break;
case 2:
mTitle = getString(R.string.title_section2);
break;
case 3:
mTitle = getString(R.string.title_section3);
break;
}
}
public void restoreActionBar() {
ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
actionBar.setDisplayShowTitleEnabled(true);
actionBar.setTitle(mTitle);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if (!mNavigationDrawerFragment.isDrawerOpen()) {
// Only show items in the action bar relevant to this screen
// if the drawer is not showing. Otherwise, let the drawer
// decide what to show in the action bar.
getMenuInflater().inflate(R.menu.main, menu);
restoreActionBar();
return true;
}
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
private static final String ARG_SECTION_NUMBER = "section_number";
/**
* Returns a new instance of this fragment for the given section
* number.
*/
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;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
((MainActivity) activity).onSectionAttached(
getArguments().getInt(ARG_SECTION_NUMBER));
}
}
}
`
Map_fragment.xml
<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="fill_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>

Your fragment is null. Otherwise the NullPointerException would be caused by the Fragment and not the Activity. Did you call getFragmentById with the correct ID which is the container ID or the XML-ID?

To pass value from activity to fragment or fragment to fragment, use setArgument.
Bundle bundle = new Bundle();
bundle.putInt(key, value);
fragment.setArguments(bundle);
How to pass values between Fragments
I hope it will help for you.

SupportMapFragment null on SECOND load

There is long time I'm trying to solve this issue. I've read so much questions about similiar issues on stackoverflow and other sources that I'm unable to list all of them.
My problem is different from the others I've read since the first time I try load the fragment with the map all works fine... Is on the second time I try to access the fragment with the map without restarting the app that it crashes with a null pointer on:
googleMap = map.getMap();
because map is null:
map = (SupportMapFragment) myContext.getSupportFragmentManager().
findFragmentById(R.id.map);
The key differences are then:
The first time it works fine
The second time findFragmentById returns null, but no error
I can't debug it because AVD emulator has no Google Play services installed.
MainActivity has a NavigationDrawer, and depending on the option selected, a Fragment or another is selected. Here some of the code related to this issue:
fragment_map.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">
<fragment
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
MyFragment.java:
...
import android.support.v4.app.DialogFragment;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
...
public class MyFragment extends Fragment implements
GooglePlayServicesClient.ConnectionCallbacks,
GooglePlayServicesClient.OnConnectionFailedListener {
private GoogleMap googleMap;
private View fragmentView;
private static WorldFragment fragment;
private FragmentActivity myContext;
...
public static MyFragment getInstance() {
if (fragment == null) {
fragment = new MyFragment();
}
return fragment;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
myContext = (FragmentActivity) activity;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
try {
GlobalState gs = (GlobalState) getActivity().getApplication();
// recover View from previous use
fragmentView = gs.getWorldFragmentView();
if (fragmentView == null) {
fragmentView = inflater.inflate(R.layout.fragment_map,
container, false);
// save View for next use
gs.setFragmentView(fragmentView);
} else {
ViewGroup parent = (ViewGroup) fragmentView.getParent();
parent.removeView(fragmentView);
}
} catch (InflateException e) {
// map is already there, just return view as it is
}
return fragmentView;
}
...
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
// Set up the map fragment
SupportMapFragment map = (SupportMapFragment) myContext.
getSupportFragmentManager().findFragmentById(R.id.map);
/* // If I active this code, no crash, but fragment remains
// in gray background without map.
// At least, if the app crashes, it restarts and the map
// gets loaded the first time
if (map == null) {
Toast.makeText(getActivity(), getString(R.string.maps_not_supported),
Toast.LENGTH_LONG).show();
return;
} */
googleMap = map.getMap();
if (googleMap != null) {
// Enable the current location "blue dot"
googleMap.setMyLocationEnabled(true);
...
} else {
Toast.makeText(getActivity(), getString(R.string.maps_not_supported),
Toast.LENGTH_LONG).show();
}
}
...
}
MainActivity.java:
public class MainActivity extends FragmentActivity implements
NavigationDrawerFragment.NavigationDrawerCallbacks {
#Override
public void onNavigationDrawerItemSelected(int position) {
Fragment contentFragment;
switch (selectedOption) {
case MAP:
contentFragment = MyFragment.getInstance();
break;
case XXX:
...
break;
default:
contentFragment = new OtherFragment();
}
// update the main content by replacing fragments
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.container, contentFragment)
.commit();
}
}
Stacktrace:
java.lang.NullPointerException
at xxx.xxxxx.xxx.fragments.MyFragment.onActivityCreated(MyFragment.java:193)
at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1508)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:958)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:446)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:153)
at android.app.ActivityThread.main(ActivityThread.java:5297)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(NativeStart.java)
Please, let me know if you need some more information.
Thank you very much for your time and attention.
30/12/2014: source code of MainActivity's onCreate() method
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
GlobalState applicationContext = (GlobalState) getApplicationContext();
applicationContext.updateLocale();
NavigationDrawerFragment.setItems(applicationContext.getMenuItems());
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
// Treating incoming notifications
Intent intent = getIntent();
String action = intent.getAction();
if (action != null && !action.isEmpty()) {
ItemType itemType = ItemType.valueOf(action);
String title = applicationContext.getMenuItemByType(itemType).getTitle();
String itemId = null;
try {
JSONObject json = new JSONObject(intent.getExtras().getString("com.parse.Data"));
itemId = json.getString(EXTRA_ITEM_ID);
} catch (JSONException e) {
Crashlytics.logException(e);
}
launchFragment(itemType, null, title, itemId);
}
}

You have to remove the fragment in the onDestroyView() method of your MyFragment class.
Sample code to remove:
#Override
public void onDestroyView() {
SupportMapFragment f = (SupportMapFragment)myContext.getSupportFragmentManager().findFragmentById(R.id.map);
if (f != null) {
try {
myContext.getSupportFragmentManager().beginTransaction().remove(f).commit();
}
catch (Exception e) {
e.printStackTrace();
}
}
super.onDestroyView();
}

Android: Navigation Drawer + Fragment + NestedFragment + SupportMapFragment

I have been reading every possible threads on stackoverflow for the past two days, and I can't figure out where my issue is... Experiencing a new error every time I bring a "fix"
Before the code, the end state: I'm trying to have a navigation drawer between multiple fragments. One of them is a restaurant search that display search results in a SupportMapFragment.
I don't get errors when I first load my fragment that contains the map, but I get error when I switch to another fragment thanks to NavigationDrawer, and I get an error when I'm pressing the back button, plus many other goodies.
Here is my code:
NavigationDrawer.java
public class NavigationDrawerActivity extends FragmentActivity {
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] mListFragments;
public static FragmentManager fragmentManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getSupportFragmentManager();
mTitle = mDrawerTitle = getTitle();
mListFragments = new String[] {"Search","Feed","About","Test"};
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new ArrayAdapter<String>(this,
R.layout.drawer_list_item, mListFragments));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// enable ActionBar app icon to behave as action to toggle nav drawer
getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
) {
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if (savedInstanceState == null) {
selectItem(0);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.navigation_drawer, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
// ActionBarDrawerToggle will take care of this.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action buttons
switch(item.getItemId()) {
default:
return super.onOptionsItemSelected(item);
}
}
public void Logout(MenuItem item) {
SharedPreferences settings = getSharedPreferences(App.PREFS_NAME, 0);
settings.edit().remove("email").apply();
settings.edit().remove("password").apply();
settings.edit().remove("userID").apply();
settings.edit().putBoolean("hasLoggedIn",false).apply();
Intent intent = new Intent(this,LoginActivity.class);
startActivity(intent);
}
/* The click listner for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectItem(position);
}
}
Fragment fragment;
private void selectItem(int position) {
// update the main content by replacing fragments
switch (position){
// Search engine
// case 0:
// if ( fragment!=null) fragment.onDestroy();
// fragment = new RestaurantSearchFragment();
// break;
// Rating feed
case 1:
// fragment = new RatingFeedTabHostFragment();
// break;
// About screen
case 2:
fragment = new AboutFragment();
break;
case 3:
fragment = new RestaurantSearchFragment2();
break;
default:
fragment = new AboutFragment();
break;
}
fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();
// update selected item and title, then close the drawer
mDrawerList.setItemChecked(position, true);
setTitle(mListFragments[position]);
mDrawerLayout.closeDrawer(mDrawerList);
}
#Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
#Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
fragment_restaurant_search.xml
<!-- Your layouts-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<!--The content you want to add-->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_action_search_dark"
android:layout_gravity="center"
android:id="#+id/icon_search"/>
<AutoCompleteTextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:singleLine="true"
android:hint="Enter Restaurant Name"
android:id="#+id/restaurant_search"
android:completionThreshold="1"
android:imeOptions="actionSearch"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button_search"
android:text="Go!"
/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/ic_action_location_found"
android:id="#+id/location_search_image"
android:layout_gravity="center"
/>
<EditText
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:hint="Near Current Location"
android:singleLine="true"
android:imeOptions="actionSearch"
android:id="#+id/location_search"
android:inputType="none"/>
</LinearLayout>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="200dp"
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"/>
<fragment android:name="com.bestpick.bestpickapplication.Screens.NavigationDrawer.RestaurantSearch.RestaurantsListFragment"
android:id="#+id/restaurant_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout="#layout/fragment_restaurants"
/>
</LinearLayout>
RestaurantSearchFragment2.java
public class RestaurantSearchFragment2 extends Fragment
{
// Handles to UI widgets
private EditText locationSearchText;
private AutoCompleteTextView restaurantSearch;
private FragmentActivity context;
// sets context from calling Navigation Drawer Activity (FragmentActivity)
#Override
public void onAttach(Activity activity) {
context=(FragmentActivity) activity;
super.onAttach(activity);
}
public static FragmentManager fragmentManager;
private RestaurantMapFragment restaurantMapFragment;
private RestaurantsListFragment restaurantsListFragment;
#Override
public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View view = inflater.inflate(R.layout.fragment_restaurant_search, container, false);
fragmentManager = getChildFragmentManager();
// setting up the restaurant list fragment
restaurantsListFragment = (RestaurantsListFragment) fragmentManager.findFragmentById(R.id.restaurant_fragment);
if (restaurantsListFragment == null) {
restaurantsListFragment = new RestaurantsListFragment();
fragmentManager.beginTransaction().replace(R.id.restaurant_fragment, restaurantsListFragment).commit();
}
// setting up the restaurant map fragment
restaurantMapFragment = (RestaurantMapFragment) fragmentManager.findFragmentById(R.id.map);
if (restaurantMapFragment==null){
restaurantMapFragment = new RestaurantMapFragment();
fragmentManager.beginTransaction().replace(R.id.map,restaurantMapFragment).commit();
}
return view;
}
}
RestaurantFragmentMap.java
public class RestaurantMapFragment extends Fragment {
private static View view;
/**
* Note that this may be null if the Google Play services APK is not
* available.
*/
private static GoogleMap mMap;
private static Double latitude, longitude;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
return null;
}
view = (RelativeLayout) inflater.inflate(R.layout.location_fragment, container, false);
// Passing harcoded values for latitude & longitude. Please change as per your need. This is just used to drop a Marker on the Map
latitude = 26.78;
longitude = 72.56;
setUpMapIfNeeded(); // For setting up the MapFragment
return view;
}
/***** Sets up the map if it is possible to do so *****/
public static void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) NavigationDrawerActivity.fragmentManager
.findFragmentById(R.id.location_map)).getMap();
// Check if we were successful in obtaining the map.
if (mMap != null)
setUpMap();
}
}
/**
* This is where we can add markers or lines, add listeners or move the
* camera.
* <p>
* This should only be called once and when we are sure that {#link #mMap}
* is not null.
*/
private static void setUpMap() {
// For showing a move to my loction button
mMap.setMyLocationEnabled(true);
// For dropping a marker at a point on the Map
mMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("My Home").snippet("Home Address"));
// For zooming automatically to the Dropped PIN Location
mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(latitude,
longitude), 12.0f));
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
if (mMap != null)
setUpMap();
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) NavigationDrawerActivity.fragmentManager
.findFragmentById(R.id.location_map)).getMap();
// Check if we were successful in obtaining the map.
if (mMap != null)
setUpMap();
}
}
#Override
public void onDetach() {
super.onDetach();
try {
Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
childFragmentManager.setAccessible(true);
childFragmentManager.set(this, null);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
/**** The mapfragment's id must be removed from the FragmentManager
**** or else if the same it is passed on the next time then
**** app will crash ****/
#Override
public void onDestroyView() {
super.onDestroyView();
if (mMap != null) {
RestaurantSearchFragment2.fragmentManager.beginTransaction()
.remove(RestaurantSearchFragment2.fragmentManager.findFragmentById(R.id.location_map)).commitAllowingStateLoss();
mMap = null;
}
}
}
location_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" >
<fragment
android:id="#+id/location_map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment" />
</RelativeLayout>
I have had all the errors in the world, the most fancy that I have right now is:
10-15 23:39:45.786 6568-6568/com.bestpick.bestpickapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.bestpick.bestpickapplication, PID: 6568
java.lang.NullPointerException
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:651)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1484)
at android.support.v4.app.FragmentManagerImpl.dispatchDestroy(FragmentManager.java:1937)
at android.support.v4.app.Fragment.performDestroy(Fragment.java:1721)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1071)
at android.support.v4.app.FragmentManagerImpl.removeFragment(FragmentManager.java:1218)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:639)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1484)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:450)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
and:
10-15 23:34:54.866 6251-6251/com.bestpick.bestpickapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.bestpick.bestpickapplication, PID: 6251
java.lang.RuntimeException: Unable to destroy activity {com.bestpick.bestpickapplication/com.bestpick.bestpickapplication.Screens.NavigationDrawer.NavigationDrawerActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3497)
at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515)
at android.app.ActivityThread.access$1400(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1249)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1360)
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1378)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
at com.bestpick.bestpickapplication.Screens.NavigationDrawer.RestaurantSearch.RestaurantMapFragment.onDestroyView(RestaurantMapFragment.java:120)
at android.support.v4.app.Fragment.performDestroyView(Fragment.java:1709)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1011)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1121)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1103)
at android.support.v4.app.FragmentManagerImpl.dispatchDestroyView(FragmentManager.java:1932)
at android.support.v4.app.Fragment.performDestroyView(Fragment.java:1706)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1011)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1121)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1103)
at android.support.v4.app.FragmentManagerImpl.dispatchDestroy(FragmentManager.java:1938)
at android.support.v4.app.FragmentActivity.onDestroy(FragmentActivity.java:336)
at android.app.Activity.performDestroy(Activity.java:5403)
at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1117)
at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3484)
            at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3515)
            at android.app.ActivityThread.access$1400(ActivityThread.java:135)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1249)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
I googled them all, read blogs, stackoverflow... still can't figure out anything!
Thanks for your much appreciated help

Do this for backpress....
#Override
public void onBackPressed(){
android.support.v4.app.FragmentManager fm = this.getSupportFragmentManager();
if(fm.getBackStackEntryCount() > 0) {
fm.popBackStack();
}
else {
}
}

android.view.InflateException not sure why its force closing

I have an error I am having trouble reproducing. I think it comes about when the app is being used then the user switches aps and of goes to the homescreen for awhile then comes back to my app. The full error is:
android.view.InflateException: Couldn't resolve menu item onClick handler
goToSearch in class android.view.ContextThemeWrapper
at android.view.MenuInflater$InflatedOnMenuItemClickListener
.<init>(MenuInflater.java:202)
at android.view.MenuInflater$MenuState.setItem(MenuInflater.java:402)
at android.view.MenuInflater$MenuState.addItem(MenuInflater.java:436)
at android.view.MenuInflater.parseMenu(MenuInflater.java:173)
at android.view.MenuInflater.inflate(MenuInflater.java:95)
at com.beerportfolio.beerportfoliopro.MainDrawer2.onCreateOptionsMenu(MainDrawer2.java:172)
at android.app.Activity.onCreatePanelMenu(Activity.java:2513)
at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)
at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:415)
at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:770)
at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:3179)
at android.os.Handler.handleCallback(Handler.java:608)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:5060)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(NativeStart.java)
Caused by: java.lang.NoSuchMethodException:
goToSearch [interface android.view.MenuItem]
at java.lang.Class.getConstructorOrMethod(Class.java:460)
at java.lang.Class.getMethod(Class.java:915)
at android.view.MenuInflater$InflatedOnMenuItemClickListener.<init>(MenuInflater.java:200)
at android.view.MenuInflater$MenuState.setItem(MenuInflater.java:402)
at android.view.MenuInflater$MenuState.addItem(MenuInflater.java:436)
at android.view.MenuInflater.parseMenu(MenuInflater.java:173)
at android.view.MenuInflater.inflate(MenuInflater.java:95)
at com.beerportfolio.beerportfoliopro.MainDrawer2.onCreateOptionsMenu(MainDrawer2.java:172)
at android.app.Activity.onCreatePanelMenu(Activity.java:2513)
at android.support.v4.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:224)
at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:415)
at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:770)
at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:3179)
at android.os.Handler.handleCallback(Handler.java:608)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:5060)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(NativeStart.java)
My main drawer2 class looks like this:
public class MainDrawer2 extends FragmentActivity
{
private static final String EXTRA_NAV_ITEM = "extraNavItem";
private static final String STATE_CURRENT_NAV = "stateCurrentNav";
private ActionBarDrawerToggle mDrawerToggle;
private DrawerLayout mDrawerLayout;
private NavDrawerListAdapter mDrawerAdapter;
private ListView mDrawerList;
private CharSequence mTitle;
private CharSequence mDrawerTitle;
private MainNavItem mCurrentNavItem;
public static Intent createLaunchFragmentIntent(
Context context, MainNavItem navItem)
{
return new Intent(context, MainDrawer2.class)
.putExtra(EXTRA_NAV_ITEM, navItem.ordinal());
}
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
Crashlytics.start(this);
mTitle = mDrawerTitle = getTitle();
mDrawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
mDrawerList = (ListView)findViewById(R.id.drawer);
getActionBar().setDisplayHomeAsUpEnabled(true);
enableHomeButtonIfRequired();
mDrawerAdapter = new NavDrawerListAdapter(getApplicationContext());
mDrawerList.setAdapter(mDrawerAdapter);
mDrawerList.setOnItemClickListener(new ListView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent,
View view, int position, long id)
{
displayNavFragment((MainNavItem)parent
.getItemAtPosition(position));
}
});
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, R.string.app_name, R.string.app_name)
{
public void onDrawerClosed(View view)
{
getActionBar().setTitle(mTitle);
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView)
{
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
if(getIntent().hasExtra(EXTRA_NAV_ITEM)){
MainNavItem navItem = MainNavItem.values()
[getIntent().getIntExtra(EXTRA_NAV_ITEM,
MainNavItem.STATISTICS.ordinal())];
displayNavFragment(navItem);
}
else if(savedInstanceState != null){
mCurrentNavItem = MainNavItem.values()
[savedInstanceState.getInt(STATE_CURRENT_NAV)];
setCurrentNavItem(mCurrentNavItem);
}
else{
displayNavFragment(MainNavItem.STATISTICS);
}
}
#TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
private void enableHomeButtonIfRequired()
{
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH){
getActionBar().setHomeButtonEnabled(true);
}
}
public void setActionBarTitle(String title) {
getActionBar().setTitle(title);
}
#Override
public void setTitle(CharSequence title)
{
mTitle = title;
getActionBar().setTitle(mTitle);
}
#Override
protected void onPostCreate(Bundle savedInstanceState)
{
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
#Override
public void onConfigurationChanged(Configuration newConfig)
{
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggles
mDrawerToggle.onConfigurationChanged(newConfig);
}
#Override
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
if (mCurrentNavItem == null) {
}
else{
outState.putInt(STATE_CURRENT_NAV, mCurrentNavItem.ordinal());
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
/*
#Override
public boolean onPrepareOptionsMenu(Menu menu)
{
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
*/
private void displayNavFragment(MainNavItem navItem)
{
//if(navItem == mCurrentNavItem) {
// return;
//}
Fragment fragment = Fragment.instantiate(this,
navItem.getFragClass().getName());
if(fragment != null) {
getSupportFragmentManager().beginTransaction()
.replace(R.id.main, fragment)
.commit();
setCurrentNavItem(navItem);
}
}
private void setCurrentNavItem(MainNavItem navItem)
{
int position = navItem.ordinal();
// If navItem is in DrawerAdapter
if(position >= 0 && position < mDrawerAdapter.getCount()){
//mDrawerList.setItemChecked(position, true);
}
else {
// navItem not in DrawerAdapter, de-select current item
if(mCurrentNavItem != null){
//mDrawerList.setItemChecked(mCurrentNavItem.ordinal(), false);
}
}
//test to keep item not selected
int toClear=mDrawerList.getCheckedItemPosition();
if (toClear >= 0) {
mDrawerList.setItemChecked(toClear, false);
}
mDrawerLayout.closeDrawer(mDrawerList);
setTitle(navItem.getTitleResId());
mCurrentNavItem = navItem;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
if(mDrawerLayout.isDrawerOpen(mDrawerList)) {
mDrawerLayout.closeDrawer(mDrawerList);
}
else {
mDrawerLayout.openDrawer(mDrawerList);
}
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void goToSearch(MenuItem item) {
//go to search page
Fragment Fragment_one;
FragmentManager man= getSupportFragmentManager();
FragmentTransaction tran = man.beginTransaction();
Fragment_one = new Search();
tran.replace(R.id.main, Fragment_one);//tran.
tran.addToBackStack(null);
tran.commit();
}
public void scanBarcode(MenuItem item) {
//open scanner
IntentIntegrator scanIntegrator = new IntentIntegrator(this);
scanIntegrator.initiateScan();
}
public void onActivityResult(int requestCode,
int resultCode, Intent intent) {
//retrieve scan result
IntentResult scanningResult = IntentIntegrator
.parseActivityResult(requestCode, resultCode, intent);
if (scanningResult != null) {
//we have a result
String scanContent = scanningResult.getContents();
//todo: set scan content into setting,
//load new fragment which calls async task below. New
//todo: fragment will have same ui as search. :-)
Fragment Fragment_one;
FragmentManager man= this.getSupportFragmentManager();
FragmentTransaction tran = man.beginTransaction();
Fragment_one = new BarcodeFrag(scanContent);
tran.replace(R.id.main, Fragment_one);//tran.
tran.addToBackStack(null);
//tran.commit();
tran.commitAllowingStateLoss();
}
else {
Toast toast = Toast.makeText(getApplicationContext(),
"No scan data received!", Toast.LENGTH_SHORT);
toast.show();
}
}
}
Lastly my menu xml looks like this:
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".MainActivity" >
<item android:id="#+id/menu_search2"
android:actionViewClass="android.widget.SearchView"
android:title="Search"
android:icon="#android:drawable/ic_menu_search"
android:showAsAction="always|collapseActionView"
android:onClick="goToSearch" />
<item android:id="#+id/action_scan"
android:icon="#drawable/barcode"
android:onClick="scanBarcode"
android:showAsAction="ifRoom|collapseActionView"/>
</menu>
I cannot for the life of me figure out where this error is coming from.

I would recommend using the onOptionsItemSelected mechanism if possible instead of manually wiring the click methods.
Take a look at the documentation:
Android Developer Guide:Menus

You might have found a platform bug. Does it still happen if you set your activity theme to Theme.Holo or Theme.Holo.Light? Specifically, try it with something that isn't based on Theme.Holo.Light.DarkActionBar.
If this fixes your original problem please report this at http://b.android.com.

You have wrong method signature.
This is yours
public void goToSearch(MenuItem item){
}
This is how it should be
public void goToSearch(View v){
}
please see
http://developer.android.com/reference/android/R.attr.html#onClick
for reference