Android Timer, update data

Make a note of the timer that is commonly used in Android to update the UI data regularly.

1.Handler + runnable Timer

Private Handler Mhandler;

Private Runnable mrunnable;

Mhandler = new Handler ();

mrunnable = new Runnable () {

Public void run () {

Ways to update data

Update ();

}

};

Timed start thread (thread executed, milliseconds)

Mhandler. postdelayed (mrunnable, 4000);

To remove a thread from a handler

Mhandler. Removecallbacks (mrunnable);

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2. Timer+timertask Timer

Timertimer = new Timer ();

Timer.schedule (new timertask () {

@Override

Public void run () {

// method of execution

Sendmsg ();

}

}, 4000); Time of execution milliseconds

3.// Sending message messages

void Sendmsg () {

//handler Message message

Message message = new message ();

Message. what = MSG;

Mhandler. SendMessage (message);

}

------Handler receive the message mechanism ------

class MyHandlerextends Handler {

@Override

Public void handlemessage (Message msg) {

// TODO auto-generated Method Stub

Super. Handlemessage (msg);

if (Msg. what =msg) {

Ways to update data

Update ();

}

}

};

4. timers executed at intervals

private timer timer;

Private Handler Mshowhandler = new Handler ();

Start timer

if (timer = = null) {
Timer = new timer ();
Timer.scheduleatfixedrate (New Refreshtask (), 0, 800); Executes every 800 milliseconds
}

Timer

Class Refreshtask extends TimerTask {

@Override
public void Run () {
You can add a judgment here to determine what situation to perform the update

if (i=0) {
Mshowhandler.post (New Runnable () {

@Override
public void Run () {
Update Data methods

Update ();

}
}

//                    }
});

Stop Timer

if (timer! = null) {
Timer.cancel ();
timer = null;
}

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