Android 三种实现定时器详解及实现方法
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2024-03-07 08:18:02
方法一:handler+thread
package com.xunfang.handerdemo;
import android.app.activi...
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!
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