Android自定义SeekBar式样

test_component.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical" >

    <SeekBar
        android:id="@+id/sb_detail_play_progress"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:maxHeight="4dp"  
        android:minHeight="4dp"  
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        android:progressDrawable="@drawable/progress_holo_light"
        android:thumb="@drawable/seekbar_thumb" />

</LinearLayout>

progress_holo_light.xml:

<?xml version="1.0" encoding="utf-8"?>
<layer-list
    xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- 未选中 -->
    <item
        android:id="@android:id/background"
        android:drawable="@drawable/seekbar_bg"/>
    <!-- 中 -->
    <item
        android:id="@android:id/progress"
        android:drawable="@drawable/seekbar_pg"/>
    <item
        android:id="@android:id/secondaryProgress"
        android:drawable="@drawable/seekbar_pg"/>
</layer-list>