How do I close a secondary Activity gracefully?

Question

I managed to create a secondary Activity, but now I wonder how I can close it again.

public void button_onClick(View v){
   finish();
}

works when I'm dealing with just one Activity at a time, but how do I let the secondary Activity close the entire application?

Answer 1

You don't "close the entire application" in Android, any more than you "close the entire application" in a Web app. See this answer for more on this topic.

Answer 2

It's work for me. In the FIRST Activity:

private boolean flag = false;

@Override
protected void onResume() {
    if(!flag)
        flag = true;
    else
        finish();
    super.onResume();
}