【Android】onKeyDown = 返回上一頁

@Override

public boolean onKeyDown(int keyCode, KeyEvent event) {

    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {

     backButton(findViewById(R.id.imageButton1));

        return false;

    }

    return false;

}

        public void backButton(View v)

{

  Intent intent = new Intent();

  intent.setClass(this, xxx.class);

  Bundle bundle = new Bundle();

  bundle.putString("maptype",maptype);

  intent.putExtras(bundle);

  startActivity(intent);

  finish();

}