Question

I have two activities. In first I come to the second activity from first so:

Intent i = new Intent(this, SecondClass.class);
startActivity(i);

but special condition require that I restart first activity because I return to it with same way:

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {

            //...

            Intent i = new Intent(this, FirstClass.class);
            startActivity(i);

            super.onKeyDown(keyCode, event);
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

Because I can’t leave first activity:
If I use

@Override
    public void onBackPressed()
    {
        finish();
        System.exit(0);
        return;
    }

or

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {

        finish();
            System.exit(0);

        return super.onKeyDown(keyCode, event);
    }
            return super.onKeyDown(keyCode, event);
}

It close my application but open second activity.
Help please!

Answer 1

just call finish() after you start a new activity(and only after you start a new activity) and let android do the rest.

Intent i = new Intent(this, SecondClass.class);
startActivity(i);
finish();

It will start the second activity and close the first one. If you press the back key now it will take you to the last open activity ( not necessarily one from your app )