Android Timer usage, androidtimer

Android Timer usage, androidtimer

Timer properties: http://www.apihome.cn/api/java/Timer.html

Statement creation:

1 private Timer mTimer; 2 3 protected void onCreate (Bundle savedInstanceState) {5 super. onCreate (savedInstanceState); 6 this. setContentView (R. layout. main); 7 8 timer = new Timer (); 9 timer. schedule (task, 1000,500 0); 11} 13 14 TimerTask task = new TimerTask () {15 @ Override 16 public void run () {18 Message message = new Message (); 20 message. what = 1; 22 handler. sendMessage (message); 24} 26}; 27 28 fin Al Handler handler = new Handler () {30 public void handleMessage (Message msg) {32 switch (msg. what) {34 case 1: 36 log. e ("Timer", "Timer"); 38 // code of the function to be implemented: update (); 40 break; 42} 44 super. handleMessage (msg); 46} 48}; 49 50 protected void onDestroy () {52 if (timer! = Null) {54 timer. cancel (); 56 timer = null; 58} 60 super. onDestroy (); 62}

The most important thing is that timer. schedule (task, 5000) does not work if it is set to timer. schedule (task.
Because timer. schedule (task, 5000) indicates the task to be executed once.
Timer. schedule (task,) indicates that the recurrence of execution starts 5 seconds after 1 second

1 private Handler handler = new Handler (); 2 3 private Runnable runnable = new Runnable () {4 5 public void run () {6 7 update (); 8 9 handler. postDelayed (this, 1000); // The postDelayed (this, 1000) method schedules a Runnable object to the main thread queue for 10 11} 12 13}; 14 15 handler. postDelayed (runnable, 1000); // start Timer16 17 handler. removeCallbacks (runnable); // stop Timer

(