Android三种实现定时器的方法

方法一:Handler+Thread

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package com.xunfang.handerDemo;        import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.widget.TextView;        /**  * handler定时器  *   * @author Smalt  *   */ public class HanderDemoActivity extendsActivity {     TextView tvShow;     privateint i = 0;            @Override     publicvoid onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         tvShow = (TextView) findViewById(R.id.tv_show);         newThread(new ThreadShow()).start();     }            // handler类接收数据     Handler handler =new Handler() {         publicvoid handleMessage(Message msg) {             if(msg.what == 1) {                 tvShow.setText(Integer.toString(i++));                 System.out.println("receive....");             }         };     };            // 线程类     classThreadShow implementsRunnable {                @Override         publicvoid run() {             // TODO Auto-generated method stub             while(true) {                 try{                     Thread.sleep(1000);                     Message msg =new Message();                     msg.what =1;                     handler.sendMessage(msg);                     System.out.println("send...");                 }catch (Exception e) {                     // TODO Auto-generated catch block                     e.printStackTrace();                     System.out.println("thread error...");                 }             }         }     } }

方法二:Handler类自带的postDelyed

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package com.xunfang.handerDemo;        import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.widget.TextView;        /**  * handler定时器使用postDelyed实现  *   * @author Smalt  *   */ public class HanderDemoActivity extendsActivity {     TextView tvShow;     privateint i = 0;     privateint TIME = 1000;            @Override     publicvoid onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);         tvShow = (TextView) findViewById(R.id.tv_show);         handler.postDelayed(runnable, TIME);//每隔1s执行     }            Handler handler =new Handler();     Runnable runnable =new Runnable() {                @Override         publicvoid run() {             // handler自带方法实现定时器             try{                 handler.postDelayed(this, TIME);                 tvShow.setText(Integer.toString(i++));                 System.out.println("do...");             }catch (Exception e) {                 // TODO Auto-generated catch block                 e.printStackTrace();                 System.out.println("exception...");             }         }     };        }

方法三:

Handler+Timer+TimerTask

package com.xunfang.handerDemo;

import java.util.Timer;

import java.util.TimerTask;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.widget.TextView;

/**

* 定时器实现:Handler+Timer+TimerTask

*

* @author Smalt

*

*/

public class HanderDemoActivity extends Activity {

TextView tvShow;

private int i = 0;

private int TIME = 1000;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

tvShow = (TextView) findViewById(R.id.tv_show);

timer.schedule(task, 1000, 1000); // 1s后执行task,经过1s再次执行

}

Handler handler = new Handler() {

public void handleMessage(Message msg) {

if (msg.what == 1) {

tvShow.setText(Integer.toString(i++));

}

super.handleMessage(msg);

};

};

Timer timer = new Timer();

TimerTask task = new TimerTask() {

@Override

public void run() {

// 需要做的事:发送消息

Message message = new Message();

message.what = 1;

handler.sendMessage(message);

}

};

}