Programmatically go back to the previous fragment

Question

Say I have an activity that has fragments added programmatically:

private void animateToFragment(Fragment newFragment, String tag) {
    FragmentTransaction ft = getFragmentManager().beginTransaction();
    ft.replace(R.id.fragment_container, newFragment, tag);
    ft.addToBackStack(null);
    ft.commit();
}

What is the best way to return to the previous fragment that was visible?

I found Trigger back-button functionality on button click in Android but I'm thinking simulating a back key event isn't the right way to go about it (and I can't get it to work either):

dispatchKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_BACK));

Calling finish() just closes the activity which I'm not interested in.

Is there a better way to go about this?

Answer 1

To elaborate on the other answers provided, this is my solution (placed in an Activity):

@Override
public void onBackPressed(){
    FragmentManager fm = getFragmentManager();
    if (fm.getBackStackEntryCount() > 0) {
        Log.i("MainActivity", "popping backstack");
        fm.popBackStack();
    } else {
        Log.i("MainActivity", "nothing on backstack, calling super");
        super.onBackPressed();  
    }
}

Answer 2

Add those line to your onBackPressed() Method. popBackStackImmediate() method will get you back to the previous fragment if you have any fragment on back stack `

if(getFragmentManager().getBackStackEntryCount() > 0){
     getFragmentManager().popBackStackImmediate();
}
else{
    super.onBackPressed();
}

`

Answer 3

To make that fragment come again, just add that fragment to backstack which you want to come on back pressed, Eg:

button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Fragment fragment = new LoginFragment();
        //replacing the fragment
        if (fragment != null) {
            FragmentTransaction ft = ((FragmentActivity)getContext()).getSupportFragmentManager().beginTransaction();
            ft.replace(R.id.content_frame, fragment);
            ft.addToBackStack("SignupFragment");
            ft.commit();
        }
    }
});

In the above case, I am opening LoginFragment when Button button is pressed, right now the user is in SignupFragment. So if addToBackStack(TAG) is called, where TAG = "SignupFragment", then when back button is pressed in LoginFragment, we come back to SignUpFragment.

Happy Coding!

Answer 4

Look at the getFragmentManager().popBackStack() methods (there are several to choose from)

http://developer.android.com/reference/android/app/FragmentManager.html#popBackStack()

Answer 5

Programmatically go back to the previous fragment using following code.

if ( getFragmentManager().getBackStackEntryCount() > 0) 
{
          getFragmentManager().popBackStack();
          return;
}
super.onBackPressed();

Answer 6

This solution works perfectly for bottom bar based fragment navigation when you want to close the app when back pressed in primary fragment.

On the other hand when you are opening the secondary fragment (fragment in fragment) which is defined as "DetailedPizza" in my code it will return the previous state of primary fragment. Cheers !

Inside activities on back pressed put this:

Fragment home = getSupportFragmentManager().findFragmentByTag("DetailedPizza");

    if (home instanceof FragmentDetailedPizza && home.isVisible()) {
        if (getFragmentManager().getBackStackEntryCount() != 0) {
            getFragmentManager().popBackStack();
        } else {
            super.onBackPressed();
        }

    } else {
        //Primary fragment
        moveTaskToBack(true);
    }

And launch the other fragment like this:

Fragment someFragment = new FragmentDetailedPizza();
    FragmentTransaction transaction = getFragmentManager().beginTransaction();
    transaction.replace(R.id.container_body, someFragment, "DetailedPizza");
    transaction.addToBackStack("DetailedPizza");
    transaction.commit();