修改拖动条的外观

<?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/cat" />

<item
android:id="@android:id/progress"
android:drawable="@drawable/late" />
</layer-list>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<bitmap
android:gravity="center"
android:src="@drawable/cat" />
</item>

<item
android:left="20dp"
android:top="20dp">
<bitmap
android:gravity="center"
android:src="@drawable/cat" />
</item>
</layer-list>

<SeekBar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:max="100"
android:progressDrawable="@drawable/bar" />