Develop Reference

How Can I move from one fragment to new fragment?

I am trying to move to another fragment by clicking on a button. the current fragment named as FirstFragment and the target fragment named as AttendanceFragment. When I run the app it just crashed.
This is the code of the current fragment
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
/**
* A simple {#link Fragment} subclass.
*/
public class FirstFragment extends Fragment {
public FirstFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_first, container, false);
Button btn1 = (Button) v.findViewById(R.id.btn1);
btn1.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
AttendanceFragment fragment = new AttendanceFragment();
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.register_attendance, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
}
);
return v;
}
}

Make an interface.
public interface FragmentChangeListener{
public void replaceFragment(Fragment fragment);
}
Implements your parent activity with this interface.
public class MainActivity extends Activity implements FragmentChangeListener {
#Override
public void replaceFragment(Fragment fragment) {
FragmentManager fragmentManager = getSupportFragmentManager();;
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
fragmentTransaction.replace(mContainerId, fragment);
fragmentTransaction.addToBackStack(fragment.toString());
fragmentTransaction.commit();
}
}
Call this method from Fragments like this.
//In your fragment - call this method from onClickListener
public void showOtherFragment(){
Fragment fragment=new NewFragmentName();
FragmentChangeListener listener = (FragmentChangeListener)getActivity();
listener.replaceFragment(fragment);
}

Please read Communicating with other Fragments
There you can find elegant version of solution posted by #Sanjog Shrestha. You should register you callback in onAttach(Activity activity) and unregister it in onDetach(). You better be sure that Activity implements interface defined by yourself.

Communication between fragments via interfaces

The fragments are a part of the bottom navigation bar, so far so good on the navigation part. But when i try to pass data from fragment1 to fragment2 the app is crashing. Also I am using the example given by google at this following link
When I use the following code android studio gives me deprecated warning!
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
So I am using CONTEXT instead of ACTIVITY below is my code that crashes :
MainActivity
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import com.br.tron.bottombar.RadioFragment;
import com.br.tron.bottombar.StreamFragment;
import com.br.tron.bottombar.InfoFragment;
public class MainActivity extends AppCompatActivity implements RadioFragment.OnNameSetListener {
BottomNavigationView bottomNavigationView;
private Fragment fragment;
private FragmentManager fragmentManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getSupportFragmentManager();
fragment = new RadioFragment();
final FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.main_container, fragment).commit();
bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigationBar);
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener(){
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_button_one:
fragment = new RadioFragment();
break;
case R.id.nav_button_two:
fragment = new StreamFragment();
break;
case R.id.nav_button_three:
fragment = new InfoFragment();
break;
}
final FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment).commit();
return true;
}
});
}
public void performStreamClick(){
View view = bottomNavigationView.findViewById(R.id.nav_button_two);
view.performClick();
}
#Override
public void setUrl(String url) {
StreamFragment frag=(StreamFragment) getSupportFragmentManager().findFragmentByTag("frag");
frag.getUrl(url);
}
}
RadioFragment(Fragment1 where the data exist)
import android.app.Activity;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
public class RadioFragment extends Fragment implements Button.OnClickListener {
Button buttonman;
View rootView;
String url;
Activity a;
OnNameSetListener onNameSetListener;
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof Activity) {
a = (Activity) context;
try{
onNameSetListener=(OnNameSetListener) context;
}
catch (Exception e){}
}
}
public RadioFragment(){
};
#Override
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_player, container, false);
buttonman = (Button)rootView.findViewById(R.id.buttonman);
buttonman.setOnClickListener(this);
return rootView;
}
#Override
public void onClick(View v) {
/*Fragment fragment = new StreamFragment();
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.main_container, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();*/
url="www.idontknow.com";
onNameSetListener.setUrl(url);
((MainActivity)a).performStreamClick();
}
public interface OnNameSetListener
{
public void setUrl(String url);
}
}
StreamFragment(fragment2 where I want to send the data -from fragment1)
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class StreamFragment extends Fragment {
TextView textViewStream;
public StreamFragment(){};
#Override
public View onCreateView(final LayoutInflater inflater,final ViewGroup container,final Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_stream, container, false);
}
public void getUrl(String url)
{
textViewStream.setText(url);
}
}
LOGCAT
01-06 20:10:23.023 3744-3744/com.br.tron.bottombar E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.br.tron.bottombar, PID: 3744
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.br.tron.bottombar.StreamFragment.getUrl(java.lang.String)' on a null object reference
at com.br.tron.bottombar.MainActivity.setUrl(MainActivity.java:64)
at com.br.tron.bottombar.RadioFragment.onClick(RadioFragment.java:61)
at android.view.View.performClick(View.java:5201)
at android.view.View$PerformClick.run(View.java:21209)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5525)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
01-06 20:10:24.663 3744-3744/? I/Process: Sending signal. PID: 3744 SIG: 9

You never register the frag tag you later search for.
In your MainActivity modify:
final FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.main_container, fragment, "frag").commit();
...
final FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment, "frag").commit();
...
In addition to that within your StreamFragment class you never set the TextViewStream variable after you inflate your layout.
#Override
public View onCreateView(final LayoutInflater inflater,final ViewGroup container,final Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_stream, container, false);
textViewStream = (TextView) view.findViewById(R.id.ID_GOES_HERE);
return view;
}
Edit: Further Errors
You're getting a ClassCastException because you're not checking to see whether the fragment you get in MainActivity.setUrl is a StreamFragment. And it makes sense that it's failing because you register the frag tag for all three types of custom Fragments. Here's a further solution:
fragment = new RadioFragment();
final FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.add(R.id.main_container, fragment, "radio_fragment").commit();
...
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
String tag = "";
case R.id.nav_button_one:
fragment = new RadioFragment();
tag = "radio_fragment";
break;
case R.id.nav_button_two:
fragment = new StreamFragment();
tag = "stream_fragment";
break;
case R.id.nav_button_three:
fragment = new InfoFragment();
tag = "info_fragment";
break;
}
final FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment, tag).commit();
return true;
}
Make the appropriate change in the Tag string in setUrl:
StreamFragment frag=(StreamFragment) getSupportFragmentManager().findFragmentByTag("stream_fragment");
if (frag != null) frag.getUrl(url);

Both of the current answers key in on your crash problem. I expect that will take care of your primary question. #asadmshah seems to have taken care of your next problem. Make sure to up vote his answer & accept it.
Regarding the warning from using Google's example code, here is what AS will currently give you if you tell it to create a new fragment.
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
The point of this is to make sure that the Activity you're attaching to implements the interface you've defined in your fragment.
And on the subject of the interface, all fragment to activity comms should be done through it. It would be better to find a way to call performStreamClick() through the interface as well. (I just realized I made this same mistake on an app I started several months ago but am just finishing up now :).
Lastly, just an FYI, you can get the attached activity of a fragment with getActivity().
EDIT:
1st, it might help to see your current code. I'm going to assume you have what Asad has put in his answer, more or less. Also, what is the expected behavior? I believe that you make a selection in RadioFragment then replace it with StreamFragment. That is, both fragments take the whole nav bar, they don't exist at the same time. If this is wrong, let me know.
If you're still calling setUrl() and performStreamClick() in the same order as before, you're getting null because you've never created a fragment by that name. You can't find a fragment you haven't already created.
Without actually setting this up to test it myself, I believe what you need to do would be to save the url in a global variable in setUrl(), then in your click listener, pass that to the StreamFragment when you create it.
See the "Deliver a Message to a Fragment" section of the link you've sited for doing that
Bundle args = new Bundle();
args.putInt(ArticleFragment.ARG_POSITION, position);
newFragment.setArguments(args);
(obviously, handling your url string instead of the int in the example)
Also, it's not a bad idea to handle null when searching for a fragment that should exist already
StreamFragment frag=(StreamFragment) getSupportFragmentManager().findFragmentByTag("stream_frag");
if(frag == null) {
final FragmentTransaction transaction = fragmentManager.beginTransaction();
StreamFragment fragment = new StreamFragment();
transaction.replace(R.id.main_container, fragment, "stream_frag").commit();
}

You should initialize your textViewStream in the StreamFragment fragment.

Destroy FragmentStatePagerAdapter instance with parent Fragment

I am not sure how to ask this. I tried in here, but I guess I was not clear enough. So, I thought I just write a small App to describe the situation. Please note, the App uses Googles SlidingTabLayout.
Long story short, at any point if I click Button1, the FrameLayout should contain Fragment1, removing Fragment2 (if exists). Therefore, FragmentViewPager should also be destroyed as Fragment2. However, even then if I change the orientation of my device, I get the Toast which is defined in the onCreate() method of FragmentViewPager.
Why FragmentViewPager's onCreate is called even if Fragment2 is paused/destroyed? Is it possible that, the Toast of FragmentViewPager will not be shown when Fragment2 is destroyed?
MainActivity:
package com.abdfahim.testproject;
import android.app.Fragment;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(onClickListener);
Button button2 = (Button) findViewById(R.id.button2);
button2.setOnClickListener(onClickListener);
}
private View.OnClickListener onClickListener = new View.OnClickListener() {
#Override
public void onClick(View v) {
Fragment fragment;
switch (v.getId()){
case R.id.button1:
fragment = new Fragment1();
break;
case R.id.button2:
fragment = new Fragment2();
break;
default:
return;
}
getFragmentManager().beginTransaction().replace(R.id.frame_container, fragment, v.getTag().toString()).addToBackStack(null).commit();
}
};
}
Fragment1
package com.abdfahim.testproject;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment1 extends Fragment {
public Fragment1(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment1,container,false);
setHasOptionsMenu(true);
return rootView;
}
}
Fragment2
package com.abdfahim.testproject;
import android.app.Fragment;
import android.app.FragmentManager;
import android.os.Bundle;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class Fragment2 extends Fragment {
public Fragment2(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment2,container,false);
setHasOptionsMenu(true);
CharSequence titles[]= {"Tab A", "Tab B"};
// Creating The ViewPagerAdapter
ViewPagerAdapter adapter = new ViewPagerAdapter(getActivity().getFragmentManager(), titles, titles.length);
ViewPager pager = (ViewPager) rootView.findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assigning the Sliding Tab Layout View
SlidingTabLayout tabs = (SlidingTabLayout) rootView.findViewById(R.id.tabs);
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
return rootView;
}
static class ViewPagerAdapter extends FragmentStatePagerAdapter {
private CharSequence titles[];
private int numbOfTabs;
public ViewPagerAdapter(FragmentManager fm, CharSequence mTitles[], int mNumbOfTabs) {
super(fm);
this.titles = mTitles;
this.numbOfTabs = mNumbOfTabs;
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
#Override
public Fragment getItem(int position) {
Bundle bundle = new Bundle();
bundle.putString("displayText", "Inside Fragment 2, " + titles[position]);
FragmentViewPager fragment = new FragmentViewPager();
fragment.setArguments(bundle);
return fragment;
}
// This method return the titles for the Tabs in the Tab Strip
#Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
// This method return the Number of tabs for the tabs Strip
#Override
public int getCount() {
return numbOfTabs;
}
}
}
FragmentViewPager
package com.abdfahim.testproject;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
public class FragmentViewPager extends Fragment {
public FragmentViewPager(){}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_view_pager,container,false);
setHasOptionsMenu(true);
Bundle bundle = this.getArguments();
TextView textView = (TextView) rootView.findViewById(R.id.tabText);
textView.setText(bundle.getString("displayText"));
return rootView;
}
#Override
public void onStart() {
super.onStart();
Toast.makeText(getActivity(), "This is View Pager Fragment", Toast.LENGTH_SHORT).show();
}
}

when you use fragment inside another fragment. you use getChildFragmentManager() instead of getFragmentManager. You can call setAdapter() for the ViewPager from onCreateView() or onActivityCreated()
for more detail. have a look at it
Why it is not possible to use ViewPager within a Fragment? It actually is

For every click your OnClickListener creates the instance of Fragment2 and does not create Fragment1. That is due to the misuse of View#getTag.
In MainActivity#onCreate, change the if in the definition of onClickListener to this(using this answer):
switch (v.getId()){
case R.id.button1:
fragment = new Fragment1();
break;
case R.id.button2:
fragment = new Fragment2();
break;
default:
return;
}
In your code, in the if that is checked upon a click (for example after clicking button1) android asks v (the clicked View) for its tag - but as none was set using View#setTag - it returns null which is of course not equal to the String object created for "button1", thus the if reverts to the else every time.

addToBackStack() method is not working without overriding the onBackPressed() method in android

Here is the code of MainActivity which I have written.
I am loading the list of fragment in the first screen. When the user taps on any of the list items, the planet name will be shown to the user in the detail fragment which I have defined in a separate class.
I am adding the transaction of "Fragment Planet List" -> "Fragment Planet Detail" to back stack. So what I expect is when I press the back button from the fragment of planet detail, it should load planet list in the phone. But it is not happening this way.
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.FrameLayout;
import com.meditab.fragments.fragment.FragmentPlanetDetail;
import com.meditab.fragments.fragment.FragmentPlanetList;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends ActionBarActivity implements Callback {
private FrameLayout frmPlanetList;
private FrameLayout frmPlanetDetail;
private boolean isPhone;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
frmPlanetList = (FrameLayout) findViewById(R.id.frmPlanetList);
frmPlanetDetail = (FrameLayout) findViewById(R.id.frmPlanetDetail);
if (null != frmPlanetDetail) {
isPhone = false;
} else {
isPhone = true;
}
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frmPlanetList, new FragmentPlanetList());
fragmentTransaction.commit();
}
#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) {
// 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);
}
#Override
public void onListItemClicked(int intPosition) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
List<String> lstPlanetArray = getPlanetArray();
String strPlanetName = lstPlanetArray.get(intPosition);
FragmentPlanetDetail fragmentPlanetDetail = FragmentPlanetDetail.newInstance(strPlanetName);
if (isPhone) {
fragmentTransaction.addToBackStack(null);
fragmentTransaction.replace(R.id.frmPlanetList, fragmentPlanetDetail);
} else {
fragmentTransaction.replace(R.id.frmPlanetDetail, fragmentPlanetDetail);
}
fragmentTransaction.commit();
}
private List<String> getPlanetArray() {
List<String> lstPlanets = new ArrayList<>(10);
lstPlanets.add("Mercury");
lstPlanets.add("Venus");
lstPlanets.add("Earth");
lstPlanets.add("Mars");
lstPlanets.add("Jupiter");
lstPlanets.add("Saturn");
lstPlanets.add("Uranus");
lstPlanets.add("Neptune");
lstPlanets.add("Saturn");
return lstPlanets;
}
}
However if I override the backPress method and pop the back stack programatically, it works just fine.
#Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount() != 0) {
getFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
Do I need to override the onBackPressed() method this way if I want to achieve this behavour?
It is not documented that you need to override this method in this link.Android Back Press Fragment Documentation
Fragment Planet Detail Class
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.meditab.fragments.R;
/**
* Created by BHARGAV on 25-Dec-14.
*/
public class FragmentPlanetDetail extends Fragment {
private String strPlanetName;
public FragmentPlanetDetail() {
}
public static FragmentPlanetDetail newInstance(String strPlanetName) {
FragmentPlanetDetail fragmentPlanetDetail = new FragmentPlanetDetail();
Bundle bundle = new Bundle();
bundle.putString("Planet_Name", strPlanetName);
fragmentPlanetDetail.setArguments(bundle);
return fragmentPlanetDetail;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle bundle = getArguments();
if (null != bundle) {
strPlanetName = bundle.getString("Planet_Name");
}
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.planet_name, container, false);
TextView txtPlanetName = (TextView) rootView.findViewById(R.id.txtPlanetName);
txtPlanetName.setText(strPlanetName);
return rootView;
}
}
Fragment Planet List Class:
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import com.meditab.fragments.Callback;
import com.meditab.fragments.R;
import java.util.ArrayList;
import java.util.List;
/**
* Created by BHARGAV on 25-Dec-14.
*/
public class FragmentPlanetList extends Fragment {
private ListView listView;
private ArrayAdapter<String> stringArrayAdapter;
private Callback callback;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.listview, container, false);
listView = (ListView) rootView.findViewById(R.id.listView);
stringArrayAdapter = new ArrayAdapter<>(getActivity(),
android.R.layout.simple_list_item_1, getPlanetArray());
listView.setAdapter(stringArrayAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
callback.onListItemClicked(position);
}
});
return rootView;
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
callback = (Callback) activity;
}
private List<String> getPlanetArray() {
List<String> lstPlanets = new ArrayList<>(5);
lstPlanets.add("Mercury");
lstPlanets.add("Venus");
lstPlanets.add("Earth");
lstPlanets.add("Mars");
lstPlanets.add("Jupiter");
lstPlanets.add("Saturn");
lstPlanets.add("Uranus");
lstPlanets.add("Neptune");
lstPlanets.add("Saturn");
return lstPlanets;
}
}
Callback Interface:
/**
* Created by BHARGAV on 26-Dec-14.
*/
public interface Callback {
public void onListItemClicked(int intPosition);
}
Thanks. Please let me know if any additional detail or code is needed.

Ok. So the reason why it is not working is the conflict of ActionBarActivty and Activity class differences.
And the differnce between getSupportFragmentManager() and getFragmentManager() methods of FragmentTransaction.
ActionBarActivity:
I was using ActionBarActivity which is android.support.v7.app.ActionBarActivity. This means I was using v7 compat library
FragmentManager:
Fragment Manager were not from the compat library. It was directly
import android.app.FragmentManager;
import android.app.FragmentTransaction;
as you can see in the MainActivity class.
Fragment:
android.app.Fragment; is the class which is imported in the separate fragment classes.
So once I changed from ActionBarActivity to Activity class, things were working fine.
The same holds true when I changed the FragmentManager,FragmentTransaction and Fragment classes to support library classes.
So after any of the modification, things started working normally.
Thanks.

Of course you don't need to override the onBackPressed() method. It's just a hack.
Your this condition is messing it up.
if (isPhone) {
fragmentTransaction.addToBackStack(null);
why don't you use this statement without condition once to see if it works. You can keep rest as it is. Just move this statement outside of the if condition.

Wierd, but I think
addToBackStack(null)
is the problem
Try replcing it with
addToBackStack("planetDetail");

You are using actionbar activity which extends fragment activity. Now, to have perfect behaviour, you need support fragments to work with actionbar activity.
Here you are using actionbar activity with normal fragments (not support v4 fragments) and that's what is causing the issue. So to have perfect behaviour, change your fragments to support fragments and it should work fine.
Let me know if that doesn't work.

Well I was having the same problem with you. What worked for me and I think its the solution for you too is to change the :
1.fragment with the fragment from the support library :
import android.support.v4.app.Fragment;
and
getFragmentManager() with the getSupportFragmentManager() :

Different when write function in onCreateView and method in class extends from Fragment

In Main class, I declare a StartActivity type variable.StartActivity fragment1 = new StartActivity();
Here is StartActivity class. I call drawTab() method on onCreateView. And It runs OK.
package com.example.android.navigationdrawerexample;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
public class StartActivity extends Fragment {
public static Context appContext;
ActionBar actionbar;
int state = 0;
/** Called when the activity is first created. */
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.main, container, false);
drawTab();
return rootView;
}
// call draw Tab method
public void drawTab() {
// ActionBar
actionbar = getActivity().getActionBar();
actionbar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab PlayerTab = actionbar.newTab().setText("Fragment A");
ActionBar.Tab StationsTab = actionbar.newTab().setText("Fragment B");
Fragment PlayerFragment = new AFragment();
Fragment StationsFragment = new BFragment();
PlayerTab.setTabListener(new MyTabsListener(PlayerFragment));
StationsTab.setTabListener(new MyTabsListener(StationsFragment));
actionbar.addTab(PlayerTab);
actionbar.addTab(StationsTab);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
}
return false;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("tab", getActivity().getActionBar()
.getSelectedNavigationIndex());
}
}
class MyTabsListener implements ActionBar.TabListener {
public Fragment fragment;
public MyTabsListener(Fragment fragment) {
this.fragment = fragment;
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
ft.replace(R.id.fragment_container, fragment);
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
ft.remove(fragment);
}
}
However, it don't need so. I want when I declare a StartActivity type variable StartActivity fragment1 = new StartActivity();
it doesn't call drawTab() method. It only called, when I call:
fragment1.drawTab(). And I tried remove drawTab() method on onCreateView
And in Main class I have:
StartActivity fragment1 = new StartActivity();
fragment1.drawTab();
However ERROR happens. I dont know reason. What is different? I think error happens when I call: actionbar = getActivity().getActionBar(); on drawTab() not onCreateView
help me solve problem? Thanks you!