【Android】控制手機上的"back"按鍵

ref:StackOverflow

using  for API level 5

@Override
public void onBackPressed() {
    // your code.
}

and for older then API 5 use this:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        // your code
        return true;
    }

    return super.onKeyDown(keyCode, event);
}