现在欧尼create方法外面,写入这两行代码:
@Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK) { if ((System.currentTimeMillis() - mExitTime) > 2000) { Object mHelperUtils; Toast.makeText(this, "再按一次退出程序", Toast.LENGTH_SHORT).show(); mExitTime = System.currentTimeMillis(); } else { finish(); } return true; } return super.onKeyDown(keyCode, event); }
再定义属性:
private long mExitTime;