Android自定义view实现进度条指示效果

<framelayout
 android:layout_width="match_parent"
 android:layout_marginleft="10dp"
 android:layout_marginright="10dp"
 android:layout_height="wrap_content">

 <progressbar
  android:id="@+id/pb_process"
  style="@style/progressstyle"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:indeterminate="false" />

 <textview
  android:id="@+id/tv_progress"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center"
  android:textcolor="@color/white"/>

</framelayout>

<style name="trainprogressstyle" parent="@android:style/widget.progressbar.horizontal">
 <item name="android:progressdrawable">@drawable/my_progress</item>
</style>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

 <item android:id="@android:id/background">
  <shape>
   <corners android:radius="5dip" />
   <gradient
    android:angle="270"

    android:centery="0.75"
    android:endcolor="@color/gray_bb"
    android:startcolor="@color/gray_bb" />
  </shape>
 </item>

 <item android:id="@android:id/secondaryprogress">
  <clip>
   <shape>
    <corners android:radius="5dip" />
    <gradient
     android:angle="270"
     android:centercolor="#f69200"
     android:centery="0.75"
     android:endcolor="#ff9800"
     android:startcolor="#ff9800" />
   </shape>
  </clip>
 </item>

 <item android:id="@android:id/progress">
  <level-list>
   <!-- 进度满时 level = 10000-->
   <item
    android:maxlevel="10000"
    android:minlevel="10000">
    <clip>
     <shape>
      <corners android:radius="5dip" />
      <gradient
       android:angle="270"
       android:centercolor="#21a837"
       android:centery="0.75"
       android:endcolor="#22ac38"
       android:startcolor="#22ac38" />
     </shape>
    </clip>
   </item>
   <!-- 进度未满时 level < 10000-->
   <item
    android:minlevel="0"
    android:maxlevel="9999"
    >
    <clip>
     <shape>
      <corners android:radius="5dip" />
      <gradient
       android:angle="270"
       android:centercolor="#f69200"
       android:centery="0.75"
       android:endcolor="#ff9800"
       android:startcolor="#ff9800" />
     </shape>
    </clip>
   </item>
  </level-list>
 </item>

</layer-list>

pb_progress.setmax();
pb_progress.setprogress();