定义SeekBar



   <SeekBar
        android:id="@+id/seekbar"
        android:layout_width="300dip"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_gravity="center"
        android:layout_marginTop="0dip"
        android:progressDrawable="@drawable/seekbar_img"
        android:thumb="@drawable/media_player_progress_button" />

media_player_progress_button.png

seekbar_img.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+android:id/background" android:drawable="@drawable/fast_seek_progress" />
<item android:id="@+android:id/progress" android:drawable="@drawable/media_player_progress_bg" />
</layer-list>  

fast_seek_progress.png

media_player_progress_bg.png