<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <!--3个层的顺序即为显示时的叠加顺序-->
  <!--背景色-->
  <item android:id="@android:id/background">
    <shape>
      <corners android:radius="5dip" />
      <solid android:color="#CCCCCC" />
    </shape>
  </item>
  <!--二级进度条的颜色-->
  <item android:id="@android:id/secondaryProgress">
    <clip>
      <shape>
        <corners android:radius="5dip" />
        <solid android:color="#88F56100" />
      </shape>
    </clip>
  </item>
  <!--一级进度条的颜色，也可以直接替换成图片-->
  <item android:id="@android:id/progress">
    <clip>
      <shape>
        <corners android:radius="5dip" />
        <solid android:color="#F56100" />
      </shape>
    </clip>
  </item>
</layer-list>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <ProgressBar
    android:id="@+id/progress_bar"
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="100dp"
    android:minHeight="20dp"
    android:padding="10dp"
    android:progressDrawable="@drawable/progressbar_bg" />
</LinearLayout>