How can I close all the activities in Android?

Question

I have two activities: First activity: MainActivity.java

Intent intent = new Intent(MainActivity.this, ChildActivity.class);
.
.
.
startActivity(intent);

Second activity: ChildActivity.java

btnExit.setOnClickListener(new View.OnClickListener(){
          public void onClick(View v)
          {
               //I wanna exit completely app in here, but i can't
                System.exit(0);
          }
  });

I've tried a lot of way on StackOverFlow but it's not working. How can i solve my problem?

Answer 1

start child activity using startActivityForResult(Intent intent, int requestCode);

For closing child activity use setResult(RESULT_OK); finish(); in your child activity.

And when it is returned, use finish(); for the same requestCode in your parent activity:

@Override
onActivityResult(int requestCode, int resultCode, Intent intent){
  if( requestCode == <yourRequestCode> && resultCode == RESULT_OK)
    finish();
}