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();
		}
	}
}