自定义圆形进度ProgressBar的颜色和图片

首先配置一个在drawable中的myProgressDrawable.xml，
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:pivotX="50%" android:pivotY="50%" android:fromDegrees="0"
android:toDegrees="360">
<shape android:shape="ring" android:innerRadiusRatio="3"
android:thicknessRatio="8" android:useLevel="false">
<gradient android:type="sweep" android:useLevel="false"
android:startColor="#000000" android:centerColor="#FFFFFF"
android:centerY="0.50" android:endColor="#FFFF00" />
</shape>
</rotate>

然后在配置布局文件里这样写：
<ProgressBar
android:id="@+id/about_dialog_webview_progress"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:indeterminate="false"

android:indeterminateDrawable="@drawable/myProgressDrawable"/>

改一下,startColor, centerColor, endColor的颜色就明白怎么回事了。
大功告成

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:pivotX="50%" android:pivotY="50%" android:fromDegrees="0"
android:toDegrees="360">
<shape android:shape="ring" android:innerRadiusRatio="3"
android:thicknessRatio="8" android:useLevel="false">
<gradient android:type="sweep" android:useLevel="false"
android:startColor="#FFFFFF" android:centerColor="#FFDC35"
android:centerY="0.50" android:endColor="#CE0000" />
</shape>
</rotate>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<rotate android:drawable="@drawable/progress_round"
android:fromDegrees="0.0" android:toDegrees="360.0" android:pivotX="50.0%"
android:pivotY="50.0%" />
</item>
</layer-list>