Android 超好用的两次退出的代码

public class MainActivity extends Activity {   @Override   protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);   }   // 连击次数 2    long[] mHits = new long[2];     public void click(View view) {    System.arraycopy(mHits, 1, mHits, 0, mHits.length - 1);    mHits[mHits.length - 1] = SystemClock.uptimeMillis();    Date date = new Date(SystemClock.uptimeMillis());    // 点击间隔时间    if (mHits[0] >= (SystemClock.uptimeMillis() - 500)) {     Toast.makeText(this, "我被2击了 ", 0).show();    }   }  }