Fragment onKeyDown() not working as intended

Question

I have framgments that are called in the order FragOne calls FragTest and FragTest calls FragBook. When my current fragment is FragBook on pressing the back button, the FragTest is just shown for split second and then the my app is sent to the app tray.

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    FragmentManager fragManager = getSupportFragmentManager();
    Fragment frag = fragManager.findFragmentByTag("Frag_Book");

    if ((keyCode == KeyEvent.KEYCODE_BACK)) {
        if (frag.isVisible()) {
            fragManager.beginTransaction()
                    .replace(R.id.container, Fragment.instantiate(MainActivity.this, fragments[1]),"Frag_Test")
                    .commit();
        }
    }
    return super.onKeyDown(keyCode, event);
}

Where have I gone wrong in the approach? Thanks...

Perhaps you should `return true` after the fragment transaction? — Karakuri, Aug 17 '15 at 06:14
no I called it in my base activity for all the fragments....I was all confused...so it happens it was because of the return statement... — Jerry, Aug 17 '15 at 06:21

score 0 · Accepted Answer · answered Aug 17 '15 at 06:24

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        FragmentManager fragManager = getSupportFragmentManager();
        Fragment frag = fragManager.findFragmentByTag("Frag_Book");

        if ((keyCode == KeyEvent.KEYCODE_BACK)) {
            if (frag.isVisible()) {
                fragManager.beginTransaction()
                        .replace(R.id.container, Fragment.instantiate(MainActivity.this, fragments[1]),"Frag_Test")
                        .commit();
             return true; //"------------- should be add"
            }
        }
        return super.onKeyDown(keyCode, event);
    }

Fragment onKeyDown() not working as intended

1 Answers1