MainActivity to fragment and back to MainActivity on pressing back button

Question

I have a Mainactivity which contains a Layout which is parent of 4 sub layout. on clicking on sub layout i am going to a new fragment replacing main layout. But i cant go ba

Answer 1

Try Like this

    public boolean popFragment() {
    boolean isPop = false;

    Fragment currentFragment = getSupportFragmentManager()
            .findFragmentById(R.id.flContent);

        if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
            isPop = true;
            getSupportFragmentManager().popBackStackImmediate();
        }

    return isPop;
}

@Override
public void onBackPressed() {
    if (!popFragment()) {
        finish();
    }
}

public void replaceFragment(Fragment fragment, boolean addToBackStack) {

    FragmentTransaction transaction = getSupportFragmentManager()
            .beginTransaction();

    if (addToBackStack) {
        transaction.addToBackStack(null);

    } else {
        getSupportFragmentManager().popBackStack(null,
                FragmentManager.POP_BACK_STACK_INCLUSIVE);

    }
    transaction.replace(R.id.fragment_container, fragment);
    transaction.commit();
    getSupportFragmentManager().executePendingTransactions();

}

add above method is in your parent Activity And Use like

 FragmentAboutUs fragmentAboutUs = new FragmentAboutUs();
 replaceFragment(fragmentAboutUs , true);