Android replace the current fragment with another fragment

Question

I just started with fragment design for HoneyComb. I created two fragments. When i click a button in the left side fragment, a new fragment is created in right side. Meanwhile when i click a button in the right fragment(ie. DetialsFragment in my code below should be replaced by another fragment. 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="horizontal" >     <fragment class="com.fragment.example.Titles"         android:id="@+id/titles" android:layout_weight="1"         android:layout_width="0px"         android:layout_height="match_parent" />     <FrameLayout android:id="@+id/details" android:layout_weight="1"         android:layout_width="0px"         android:layout_height="match_parent" />  </LinearLayout> 

FragmentExample.java

public class FragmentExample extends Activity { /** Called when the activity is first created. */     @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);     } } 

Titles.java

public class Titles extends Fragment {     public FragmentTransaction ft;     @Override     public View onCreateView(LayoutInflater inflater,         ViewGroup container, Bundle savedInstanceState) {         View v = inflater.inflate(R.layout.main1, null);         Button button1 = (Button)v.findViewById(R.id.button1);         button1.setText("santhosh");         button1.setOnClickListener(new OnClickListener() {                @Override             public void onClick(View arg0) {                 // TODO Auto-generated method stub                  DetailsFragment details = (DetailsFragment)                             getFragmentManager().findFragmentById(R.id.details);                     if (details == null || details.getShownIndex() != 1) {                         // Make new fragment to show this selection.                         details = DetailsFragment.newInstance(1);                          // Execute a transaction, replacing any existing                         // fragment with this one inside the frame.                         ft                                 = getFragmentManager().beginTransaction();                         ft.add(R.id.details, details, "detail");                         ft.setTransition(                                 FragmentTransaction.TRANSIT_FRAGMENT_FADE);                         ft.commit();                     }             }          });         return v;     } } 

DetailsFragment.java

public class DetailsFragment extends Fragment {     /**      * Create a new instance of DetailsFragment, initialized to      * show the text at 'index'.      */     Titles title = new Titles();     String[] titles = {"Title1", "Title2", "Title3", "Title4"};     public static DetailsFragment newInstance(int index) {         DetailsFragment f = new DetailsFragment();          // Supply index input as an argument.         Bundle args = new Bundle();         args.putInt("index", index);         f.setArguments(args);          return f;     }      public int getShownIndex() {         return getArguments().getInt("index", 0);     }      @Override     public View onCreateView(LayoutInflater inflater,         ViewGroup container, Bundle savedInstanceState) {         if (container == null) {             // Currently in a layout without a container, so no             // reason to create our view.             return null;         }         Button button = new Button(getActivity());         button.setText("Next");         button.setOnClickListener(new OnClickListener() {              @Override             public void onClick(View v) {                 // TODO Auto-generated method stub             }         });         return button;     } } 

Answer 1

Then provided your button is showing and the click event is being fired you can call the following in your click event:

final FragmentTransaction ft = getFragmentManager().beginTransaction();  ft.replace(R.id.details, new NewFragmentToReplace(), "NewFragmentTag");  ft.commit();  

and if you want to go back to the DetailsFragment on clicking back ensure you add the above transaction to the back stack, i.e.

ft.addToBackStack(null); 

Or am I missing something? Alternatively some people suggest that your activity gets the click event for the button and it has responsibility for replacing the fragments in your details pane.