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

其中动画loading:

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<?xml version="1.0" encoding="UTF-8"?>  
<animation-list android:oneshot="false"  
  xmlns:android="http://schemas.android.com/apk/res/android">  
  <item android:duration="60" android:drawable="@drawable/load_1" />  
  <item android:duration="60" android:drawable="@drawable/load_3" />  
  <item android:duration="60" android:drawable="@drawable/load_5" />  
  <item android:duration="60" android:drawable="@drawable/load_7" />  
  <item android:duration="60" android:drawable="@drawable/load_9" />  
  <item android:duration="60" android:drawable="@drawable/load_11" />  
  <item android:duration="60" android:drawable="@drawable/load_13" />  
  <item android:duration="60" android:drawable="@drawable/load_15" />  
</animation-list>  

方式2：（效果为自定义图片让其不断的旋转）

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<ProgressBar  
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"  
    android:indeterminate="true"  
    android:indeterminateDrawable="@drawable/progressbar" />  

其中progressbar:

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

方式三：（效果为自定义颜色让其不断的旋转）

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<ProgressBar  
    android:layout_width="wrap_content"  
    android:layout_height="wrap_content"  
    android:indeterminate="true"  
    android:indeterminateDrawable="@drawable/progressbar2" />  

其中progressbar2:

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<pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>  
<rotate xmlns:android="http://schemas.android.com/apk/res/android"  
    android:fromDegrees="0"  
    android:pivotX="50%"  
    android:pivotY="50%"  
    android:toDegrees="360" >  
    <shape  
        android:innerRadiusRatio="3"  
        android:shape="ring"  
        android:thicknessRatio="8"  
        android:useLevel="false" >  
        <gradient  
            android:centerColor="#FFFFFF"  
            android:centerY="0.50"  
            android:endColor="#1E90FF"  
            android:startColor="#000000"  
            android:type="sweep"  
            android:useLevel="false" />  
    </shap