Finish parent and current activity in Android

Question

I have 3 activities. Activity A which leads to activity B, which in turn can go back to activity A or start activity C. However, if I press back in activity C the app should

Answer 1

This is working perfectly:

btn_back.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v) {

Player.this.finish();
    }
});