Android三种实现定时器的方法

方法一、使用handler和thread（线程）实现定时器

package com.xunfang.handerdemo;
import android.app.activity;
import android.os.bundle;
import android.os.handler;
import android.os.message;
import android.widget.textview;
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() {
            while (true) {
                try {
                    thread.sleep(1000);
                    message msg = new message();
                    msg.what = 1;
                    handler.sendmessage(msg);
                    system.out.println("send...");
                } catch (exception e) {
                    e.printstacktrace();
                    system.out.println("thread error...");
                }
            }
        }
    }
}

方法二、使用handler类自带的postdelyed实现定时器

package com.xunfang.handerdemo;
import android.app.activity;
import android.os.bundle;
import android.os.handler;
import android.widget.textview;
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、使用handler、timer和timertask三个android类实现定时器

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;
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() {
            // 发送消息
            message message = new message();
            message.what = 1;
            handler.sendmessage(message);
        }
    };
}