<layer-list xmlns:android="http://schemas.android.com/apk/res/android"> 
<item android:id="@android:id/background">
<shape>
<corners android:radius="5dip" />
<gradient
android:startColor="@color/gray_cc"
android:centerColor="@color/gray_cc"
android:centerY="0.75"
android:endColor="@color/gray_cc"
android:angle="270"/>
</shape>
</item>
< !-- 我的没有第二背景，故第二背景图没有画 -->
<item android:id="@android:id/secondaryProgress">
<clip>
<shape>
<corners android:radius="5dip" />
<gradient
android:startColor="#80ffd300"
android:centerColor="#80ffb600"
android:centerY="0.75"
android:endColor="#a0ffcb00"
android:angle="270"/>
</shape>
</clip>
</item>
<item android:id="@android:id/progress">
<clip>
<shape>
<corners android:radius="5dip" />
<gradient
android:startColor="@color/gray_cc"
android:centerColor="@color/gray_cc"
android:centerY="0.75"
android:endColor="@color/gray_cc"
android:angle="270"/>
</shape>
</clip>
</item>
</layer-list>

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/seekbar_thumb_gray" android:state_focused="true" android:state_pressed="true" />
<item android:drawable="@drawable/seekbar_thumb_gray" android:state_focused="false" android:state_pressed="false" />
<item android:drawable="@drawable/seekbar_thumb_gray" android:state_focused="true" android:state_pressed="false" />
<item android:drawable="@drawable/seekbar_thumb_gray" android:state_focused="true" />
</selector>

android:progressDrawable="@drawable/seekbar_light"
android:thumb="@drawable/seekbar_thumb"

android:maxHeight="5dp"
android:minHeight="5dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"

//获取seerbar层次drawable对象
LayerDrawable layerDrawable = (LayerDrawable) sb.getProgressDrawable();
// 有多少个层次（最多三个）
int layers = layerDrawable.getNumberOfLayers();
Drawable[] drawables = new Drawable[layers];
for (int i = 0; i < layers; i++) {
switch (layerDrawable.getId(i)) {
// 如果是seekbar背景
case android.R.id.background:
drawables[i] = layerDrawable.getDrawable(0);
break;
// 如果是拖动条第一进度
case android.R.id.progress:
//这里为动态的颜色值
drawables[i] = new PaintDrawable(progressColor);
drawables[i].setBounds(layerDrawable.getDrawable(0).getBounds());
break;
...
}
}
sb.setProgressDrawable(new LayerDrawable(drawables));
sb.setThumb(thumb);
sb.invalidate();

//获取seerbar层次drawable对象
LayerDrawable layerDrawable = (LayerDrawable) sb.getProgressDrawable();
//因为画背景图时候第二进度背景图没有画,所以直接为1
Drawable drawable = layerDrawable.getDrawable(1);
drawable.setColorFilter(progressColor, PorterDuff.Mode.SRC);
//获取滑块背景
Drawable thumb = sb.getThumb();
thumb.setColorFilter(thumbColor, PorterDuff.Mode.SRC);
sb.invalidate();