Android利用android:indeterminateDrawable来实现ProgressBar三种方式

方式1：(效果为补间动画一样)

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1. <ProgressBar  
2.     android:layout_width="wrap_content"  
3.     android:layout_height="wrap_content"  
4.     android:indeterminate="true"  
5.     android:indeterminateDrawable="@anim/loading" />  

其中动画loading:

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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <animation-list android:oneshot="false"  
3.   xmlns:android="http://schemas.android.com/apk/res/android">  
4.   <item android:duration="60" android:drawable="@drawable/load_1" />  
5.   <item android:duration="60" android:drawable="@drawable/load_3" />  
6.   <item android:duration="60" android:drawable="@drawable/load_5" />  
7.   <item android:duration="60" android:drawable="@drawable/load_7" />  
8.   <item android:duration="60" android:drawable="@drawable/load_9" />  
9.   <item android:duration="60" android:drawable="@drawable/load_11" />  
10.   <item android:duration="60" android:drawable="@drawable/load_13" />  
11.   <item android:duration="60" android:drawable="@drawable/load_15" />  
12. </animation-list>  

方式2：（效果为自定义图片让其不断的旋转）

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1. <ProgressBar  
2.     android:layout_width="wrap_content"  
3.     android:layout_height="wrap_content"  
4.     android:indeterminate="true"  
5.     android:indeterminateDrawable="@drawable/progressbar" />  

其中progressbar:

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1. <?xml version="1.0" encoding="utf-8"?>  
2. <layer-list xmlns:android="http://schemas.android.com/apk/res/android" >  
3.   
4.     <item>  
5.         <rotate  
6.             android:drawable="@drawable/load"  
7.             android:fromDegrees="0.0"  
8.             android:pivotX="50.0%"  
9.             android:pivotY="50.0%"  
10.             android:toDegrees="360.0" />  
11.      <span style="white-space:pre">   </span>    <!-- 其中360.0值越大，转的圈圈越快 -->  
12.     </item>  
13.   
14. </layer-list>  

方式三：（效果为自定义颜色让其不断的旋转）

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1. <ProgressBar  
2.     android:layout_width="wrap_content"  
3.     android:layout_height="wrap_content"  
4.     android:indeterminate="true"  
5.     android:indeterminateDrawable="@drawable/progressbar2" />  

其中progressbar2:

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1. <pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>  
2. <rotate xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:fromDegrees="0"  
4.     android:pivotX="50%"  
5.     android:pivotY="50%"  
6.     android:toDegrees="360" >  
7.     <shape  
8.         android:innerRadiusRatio="3"  
9.         android:shape="ring"  
10.         android:thicknessRatio="8"  
11.         android:useLevel="false" >  
12.         <gradient  
13.             android:centerColor="#FFFFFF"  
14.             android:centerY="0.50"  
15.             android:endColor="#1E90FF"  
16.             android:startColor="#000000"  
17.             android:type="sweep"  
18.             android:useLevel="false" />  
19.     </shap