安卓 毫秒级时间显示APK

写了个毫秒级日期时间显示APK, 用于测试时间延迟，60Hz屏幕上，基本做到16ms刷新一次。

编译好的APK： mstimer.apk_android毫秒计时器-其它文档类资源-CSDN下载

主要代码：

    private static String TAG = "MainActivity";
    private TextView timeView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.i(TAG, "onCreate");
        setContentView(R.layout.activity_main);
        timeView = (TextView)findViewById(R.id.timeView);
        handler = new Handler(MainActivity.this);
    }

    Handler handler;

    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, "onStart");
        handler.sendEmptyMessageDelayed(0, 4);
    }

    @Override
    protected void onStop() {
        super.onStop();
        handler.removeMessages(0);
        Log.i(TAG, "onStop");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        Log.i(TAG, "onDestroy");
    }

    @Override
    public boolean handleMessage(@NonNull Message msg) {
        handler.sendEmptyMessageDelayed(1, 4);
        Calendar calendar = Calendar.getInstance();
        String text = String.format("%02d:%02d:%02d %03d",
                calendar.get(Calendar.HOUR_OF_DAY),
                calendar.get(Calendar.MINUTE),
                calendar.get(Calendar.SECOND),
                calendar.get(Calendar.MILLISECOND % 1000));
        timeView.setText(text);
        return false;
    }