本文实例讲述了android编程开发之seekbar采用handler消息处理操作的方法。分享给大家供大家参考，具体如下：
该案例简单实现进度条可走，可拖拽的功能，下面请看源码：
布局文件：
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<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin" tools:context=".mainactivity" > <seekbar android:id="@+id/seekbar1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignparentleft="true" android:layout_alignparenttop="true" /></relativelayout> |
java文件：
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package com.example.lession16_seekbar;import android.os.bundle;import android.os.handler;import android.os.message;import android.app.activity;import android.view.menu;import android.widget.seekbar;public class mainactivity extends activity { private seekbar seekbar; private static final int max_progress =100; private int current_progress=10; private static final int pro=1; private handler handler; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); seekbar = (seekbar) this.findviewbyid(r.id.seekbar1); seekbar.setmax(max_progress); /* new thread(new runnable() { @override public void run() { while(true){ try { thread.sleep(600); current_progress+=10; seekbar.setprogress(current_progress); } catch (interruptedexception e) { // todo auto-generated catch block e.printstacktrace(); } } } }).start();*/ handler = new handler(){ @override public void handlemessage(message msg) { super.handlemessage(msg); switch (msg.what) { case pro: if(current_progress>=max_progress){ }else{ current_progress+=1; seekbar.incrementprogressby(1); handler.sendemptymessagedelayed(pro, 600); } break; default: break; } } }; current_progress=current_progress>0?current_progress:0; seekbar.setprogress(current_progress); handler.sendemptymessage(pro); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate the menu; this adds items to the action bar if it is present. getmenuinflater().inflate(r.menu.main, menu); return true; }} |
效果图（自动走）：
希望本文所述对大家android程序设计有所帮助。
