android 超好用的两次退出的代码, 值得收藏

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();
        }
    }
}