"Back button" using getSupportActionbar and appcompat v7 toolbar

Question

I'm using the new toolbar from the Appcompat V7 library and I'm making an application with navigation drawer and with fragments.

In some fragments I don't want to show the hamburger icon but the arrow instead... That is fine I did this in this way:

mDrawerToggle.setDrawerIndicatorEnabled(false);

mDrawerToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);

getSupportActionBar().setHomeAsUpIndicator(R.drawable.abc_ic_ab_back_mtrl_am_alpha);

My question is that: How or where i need to set up the home button lisener or what i need to listen for the "back" button ? I want to call the main backpressed method and to set back the navigation drawer icon with the hamburger icon..

Answer 1

Add this method in onCreate():

getSupportActionBar().setDisplayHomeAsUpEnabled(true);

Then override the onOptionItemSelected() as below:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            onBackPressed();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}