Android三种实现定时器的方法

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);

}

};

}