自定义ProgressBar的加载效果

三种方式实现自定义圆形页面加载中效果的进度条 

To get a ProgressBar in the default theme that is to be used on white/light back ground, use one of the inverse styles: 
 
 
 

进度条 

 <ProgressBar android:layout_width="fill_parent" android:layout_height="wrap_content" style="?android:attr/progressBarStyleHorizontal"  />

一、通过动画实现 
定义res/anim/loading.xml如下： 

 xml version="1.0" encoding="UTF-8"?>
 <animation-list android:oneshot="false"
   xmlns:android="http://schemas.android.com/apk/res/android">
   <item android:duration="150" android:drawable="@drawable/loading_01" />
   <item android:duration="150" android:drawable="@drawable/loading_02" />
   <item android:duration="150" android:drawable="@drawable/loading_03" />
   <item android:duration="150" android:drawable="@drawable/loading_04" />
   <item android:duration="150" android:drawable="@drawable/loading_05" />
   <item android:duration="150" android:drawable="@drawable/loading_06" />
   <item android:duration="150" android:drawable="@drawable/loading_07" />
 animation-list>

在layout文件中引用如下： 

 <ProgressBar
   android:layout_width="wrap_content"
 android:layout_height="wrap_content"
   android:indeterminate="false"
 android:indeterminateDrawable="@anim/loading" />

二、通过自定义颜色实现 
定义res/drawable/dialog_style_xml_color.xml如下： 

 xml version="1.0" encoding="utf-8"?>
 <rotate xmlns:android="http://schemas.android.com/apk/res/android"
 android:pivotX="50%" android:pivotY="50%" android:fromDegrees="0"
 android:toDegrees="360">
 <shape android:shape="ring" android:innerRadiusRatio="3"
   android:thicknessRatio="8" android:useLevel="false">
   <gradient android:type="sweep" android:useLevel="false"
    android:startColor="#FFFFFF" android:centerColor="#FFDC35"
    android:centerY="0.50" android:endColor="#CE0000" />
 shape>
 rotate>

在layout文件中引用如下： 

 <ProgressBar
   android:layout_width="wrap_content"
 android:layout_height="wrap_content"
   android:indeterminate="false" android:indeterminateDrawable="@drawable/dialog_style_xml_color" />

三、使用一张图片进行自定义 
定义res/drawable/dialog_style_xml_icon.xml如下： 

 xml version="1.0" encoding="utf-8"?>
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
 <item>
   <rotate android:drawable="@drawable/dialog_progress_round"
    android:fromDegrees="0.0"
 android:toDegrees="360.0"
 android:pivotX="50.0%"
    android:pivotY="50.0%" />
 item>
 layer-list>

在layout文件中引用如下： 

 <ProgressBar
   android:layout_width="wrap_content"
 android:layout_height="wrap_content"
   android:indeterminate="false" android:indeterminateDrawable="@drawable/dialog_style_xml_icon" />

或者使用旋转一张图片： 

 <ProgressBar
         style="@android:style/Widget.ProgressBar"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:indeterminateDrawable="@drawable/custom_progress_draw"
         android:indeterminate="false" />

custom_progress_draw.xml: 

 xml version="1.0" encoding="utf-8"?>
 <animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
     android:drawable="@drawable/circular"
     android:pivotX="50%"
     android:pivotY="50%" />

circular就是一张转动效果的静态图片。 

main.xml如下： 

 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" android:gravity="center"
 android:background="#FFF">
 <Button android:text="@string/anim" android:id="@+id/anim"
   android:layout_width="120dip" android:layout_height="wrap_content" />
 <Button android:text="@string/color" android:id="@+id/color"
   android:layout_width="120dip" android:layout_height="wrap_content" />
 <Button android:text="@string/icon" android:id="@+id/icon"
   android:layout_width="120dip" android:layout_height="wrap_content" />
 LinearLayout>

 


新浪下载图片的ProgressBar进度样式源码 
http://www.eoeandroid.com/code/2012/0711/1851.html  


一个绚丽的loading动效分析与实现！ 
http://blog.csdn.net/tianjian4592/article/details/44538605