How to go back to previous fragment from activity?

Question

I\'ve got an app with nav drawer, which is switching fragments. From inside one of those fragments, I am calling a new activity. When I click back in this activity (in toolbar),

Answer 1

I see, that people are still trying to help me. This answer helped me fix my problem: Android - Navigation Up from Activity to Fragment

Answer 2

What I tend to do is this

@Override
public void onBackPressed() {
    if (getFragmentManager().getBackStackEntryCount() == 0) {
        this.finish();
    } else {
        super.onBackPressed(); //replaced
    }
}

This way it handles the fragment stuff on its own within, but when there's no fragments left to go back to, then it finishes the activity.

EDIT: UP navigation can recreate your previous activity even if it already exists. To prevent that from happening, redefine the Up navigation's event in onOptionsItemSelected like so:

public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            Intent parentIntent = NavUtils.getParentActivityIntent(this);
            if(parentIntent == null) { 
                finish();
                return true;
            } else {
                parentIntent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT | Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
                startActivity(parentIntent);
                finish();
                return true;
            }
    }
    return super.onOptionsItemSelected(item);
}