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Android实现定时器的方法

2024-07-26 06:38:30   215人阅读

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);        }    };}

Android实现定时器的方法


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