how to go back to previous fragment on pressing manually back button of individual fragment?

Question

I have only one activity and multiple fragments in my application.

Two main fragment A(left) and B(right).

Fragment A1 called from A  B1 called from B  B2 called from B1 

All fragments have individual back buttons.

So when I press back button of fragment A1, it should go back to A, similarly when Back button from B2 is pressed, B1 appears and from B1 to B and so on.

How to implement this type of functionality?

Answer 1

public void onBackPressed() {     FragmentManager fm = getActivity().getSupportFragmentManager();     fm.popBackStack(); } 

Answer 2

I have implemented the similar Scenario just now.

Activity 'A' -> Calls a Fragment 'A1' and clicking on the menu item, it calls the Fragment 'A2' and if the user presses back button from 'A2', this goes back to 'A1' and if the user presses back from 'A1' after that, it finishes the Activity 'A' and goes back.

See the Following Code:

Activity 'A' - OnCreate() Method:

@Override public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activityA);      if (savedInstanceState == null) {         Fragment fragInstance;          //Calling the Fragment newInstance Static method         fragInstance = FragmentA1.newInstance();          getFragmentManager().beginTransaction()                 .add(R.id.container, fragInstance)                 .commit();     } } 

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Fragment : 'A1'

I am replacing the existing fragment with the new Fragment when the menu item click action happens:

@Override public boolean onOptionsItemSelected(MenuItem item) {     if (item.getItemId() == R.id.action_edit_columns) {         //Open the Fragment A2 and add this to backstack         Fragment fragment = FragmentA2.newInstance();         this.getFragmentManager().beginTransaction()                 .replace(R.id.container, fragment)                 .addToBackStack(null)                 .commit();          return true;     }     return super.onOptionsItemSelected(item); } 

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Activity 'A' - onBackPressed() Method:

Since all the fragments have one parent Activity (which is 'A'), the onBackPressed() method lets you to pop fragments if any are there or just return to previous Activity.

@Override public void onBackPressed() {     if(getFragmentManager().getBackStackEntryCount() == 0) {         super.onBackPressed();     }     else {         getFragmentManager().popBackStack();     } } 

If you are looking for Embedding Fragments inside Fragments, please refer the link: http://developer.android.com/about/versions/android-4.2.html#NestedFragments