Android实现定时器的方法

来源(博客园)

From: https://www.cnblogs.com/tyjsjl/p/4014285.html

Android实现定时器的方法

一、Handler 和 Thread

package com.lstech.app;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.TextView;

/**
* handler定时器
*
*
*/
public class HandlerActivity 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...");
				}
			}
		}
	}
}


二、Handler的postDelyed方法

package com.lstech.app;

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
*
*/
public class postDelyedActivity extends Activity {
	TextView tvShow;
	private int i = 0;
	private int DELYED= 1000;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		tvShow = (TextView) findViewById(R.id.tv_show);
		handler.postDelayed(runnable, DELYED); //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, DELYED);
				tvShow.setText(Integer.toString(i++));
				System.out.println("do...");
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				System.out.println("exception...");
			}
		}
	};

}



三、Handler + Timer + TimerTask

package com.lstech.app;

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
*  *
*/
public class TimerActivity 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);
		}
	};
}

Link: http://www.asm32.net/article_details.aspx?id=7332


浏览次数 0 发布时间 2018-11-30 01:15:21 从属分类 Android 安卓 【评论】【 】【打印】【关闭
 
| www.asm32.net | 2006版 | 资料中心 | linux | asm/asm32 | C/C++ | VC++ | java | Python | 书签 | ASP.Net书签 | 京ICP备09029108号-1