Android 三种实现定时器详解及实现方法

方法一:Handler+Thread

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 extends Activity {
 TextView tvShow;
 private int i = 0; 

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  tvShow = (TextView) findViewById(R.id.tv_show);
  new Thread(new ThreadShow()).start();
 } 

 // handler类接收数据
 Handler handler = new Handler() {
  public void handleMessage(Message msg) {
   if (msg.what == 1) {
    tvShow.setText(Integer.toString(i++));
    System.out.println("receive....");
   }
  };
 }; 

 // 线程类
 class ThreadShow implements Runnable { 

  @Override
  public void 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

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 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);
  handler.postDelayed(runnable, TIME); //每隔1s执行
 } 

 Handler handler = new Handler();
 Runnable runnable = new Runnable() { 

  @Override
  public void 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);
  }
 };
}

以上就是对Android 定时器的资料整理后续继续补充相关知识，谢谢大家对本站的支持！