android自定义SeekBar

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">

<!--<SeekBar android:id="@+id/now_playing_seekbar_music_playing"
		android:progressDrawable="@drawable/play_seekbar_port_style"
		android:layout_marginLeft="31px" 
		android:layout_width="418px"
		android:layout_height="wrap_content" 
		android:paddingLeft="0px"
		android:paddingRight="0px"
		android:minHeight="7px"
		android:maxHeight="7px" 
		android:progress="0" 
		android:max="1000"
		android:layout_marginBottom="266px"
		android:layout_alignParentBottom="true" />
 -->

	<SeekBar 
	    android:id="@+id/now_playing_seekbar_music_playing"
		android:layout_width="400px"
		android:layout_height="wrap_content" 
		android:progress="0" 
		android:max="1000" 
		android:minHeight="7px"
		android:maxHeight="7px" 
		android:paddingLeft="0px"
		android:paddingRight="0px"
		android:progressDrawable="@drawable/play_seekbar_port_style"
		android:thumb="@drawable/thumb" 
		android:layout_marginBottom="266px"
		android:layout_alignParentBottom="true" />
</LinearLayout>