3 ways to implement timer in "Go" Android

Original URL: http://www.android-study.com/pingtaikaifa/508.html

In Android development, the timer generally has the following 3 ways to implement:

The sleep (long) method using handler and thread
Second, using handler postdelayed (Runnable, Long) method
Third, the use of handler and timer and TimerTask combination method

Here are the following:

The sleep (long) method using handle and thread

Handler is primarily used to handle received messages. This is only the main method, of course, there are other ways to achieve handler, interested in the API can be checked, there is not too much explanation.

1. Define a handler class to handle the received message.

Handler Handler = new Handler () {public    void Handlemessage (Message msg) {        //things to do        super.handlemessage (msg) ;    }};

2. Create a new thread class that implements the Runnable interface, as follows:

public class MyThread implements Runnable {@Overridepublic void Run () {//TODO auto-generated method Stubwhile (true) {try {Thread.Sleep (10000);//thread pauses 10 seconds, unit milliseconds Message message = new Message (); message.what = 1;handler.sendmessage (message);// Send Message} catch (Interruptedexception e) {//TODO auto-generated catch Blocke.printstacktrace ();}}}

3. Add the following statement where you want to start the thread:

New Thread (New MyThread ()). Start ();

4. After the thread is started, the thread sends a message every 10s.

Second, using handler postdelayed (Runnable, Long) method

This implementation is relatively simple.

1. Define a handler class

Handler handler=new Handler (); Runnable runnable=new Runnable () {    @Override public    void Run () {        //TODO auto-generated Method stub        // What to do        handler.postdelayed (this, a);    }};

2. Start the timer

3. Stop Timer

Third, the use of handler and timer and TimerTask combination method

1. Define timer, timer task and handler handle

Private Final Timer timer = new timer (); Private TimerTask task; Handler Handler = new Handler () {     @Override public     void Handlemessage (Message msg) {         //TODO auto-generated Me Thod stub         //What to do         super.handlemessage (msg);}     };

2. Initializing Timer tasks

task = new TimerTask () {     @Override public     void Run () {         //TODO auto-generated method stub         Message message = new Message ();         Message.what = 1;         Handler.sendmessage (message);     

3. Start the timer

Briefly describe some of the three steps mentioned above:

1. Timer task (TimerTask) as the name implies, that is, when the timer arrives at the specified time to do the work, here is to handler send a message, by the handler class for processing.

2. Java.util.Timer.schedule (timertask task, long delay): This method means that the task is executed after dalay/1000 seconds. Only once.
Java.util.Timer.schedule (timertask task, long delay, long period): This method is to say that the task is executed after delay/1000 seconds and then into period/ 1000 seconds to execute the task again, this is used for looping tasks, executed countless times, of course, you can use Timer.cancel (); Cancel the execution of the timer.

3 ways to implement timer in "Go" Android