Android实战教程第二篇之简单实现两种进度条效果

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="vertical" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 > 
<textview 
 android:layout_width="fill_parent" 
 android:layout_height="wrap_content" 
 android:text="@string/hello" 
 /> 
<progressbar 
 android:id="@+id/firstbar" 
 style="?android:attr/progressbarstylehorizontal" 
 android:layout_width="200dp" 
 android:layout_height="wrap_content" 
 android:visibility="gone" 
 /> 
<progressbar 
 android:id="@+id/secondbar" 
 style="?android:attr/progressbarstyle" 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:visibility="gone" 
 /> 
<button 
 android:id="@+id/mybutton" 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:text="begin" 
 /> 
</linearlayout> 

package ydl.progressbar; 
 
import android.app.activity; 
import android.os.bundle; 
import android.view.view; 
import android.view.view.onclicklistener; 
import android.widget.button; 
import android.widget.progressbar; 
 
public class progressbartest extends activity { 
 /** called when the activity is first created. */ 
 //声明变量 
 private progressbar firstbar =null; 
 private progressbar secondbar = null; 
 private button mybutton = null; 
 private int i = 0 ; 
 @override 
 public void oncreate(bundle savedinstancestate) { 
  super.oncreate(savedinstancestate); 
  setcontentview(r.layout.main); 
  //根据控件的id来取得代表控件的对象 
  firstbar = (progressbar)findviewbyid(r.id.firstbar); 
  secondbar = (progressbar)findviewbyid(r.id.secondbar); 
  mybutton = (button)findviewbyid(r.id.mybutton); 
  mybutton.setonclicklistener(new buttonlistener()); 
 } 
 class buttonlistener implements onclicklistener{ 
   
  @override 
  public void onclick(view v) { 
   if(i == 0) 
   { 
    //设置进度条处于可见的状态 
    firstbar.setvisibility(view.visible); 
    firstbar.setmax(150);//手动设置最大值，默认是100 
    secondbar.setvisibility(view.visible); 
   } 
   else if ( i < firstbar.getmax()){ 
    //设置主进度条的当前值 
    firstbar.setprogress(i); 
    //设置第二进度条的当前值 
    firstbar.setsecondaryprogress(i + 10); 
    //因为默认的进度条无法显示进行的状态 
    //secondbar.setprogress(i); 
     
   } 
   else{ 
    //设置进度条处于不可见状态 
    firstbar.setvisibility(view.gone); 
    secondbar.setvisibility(view.gone); 
   } 
   i = i + 10 ; 
  } 
   
 } 
  
}