相关疑难解决方法(0)

阅读Google提供的有限文档后,我感觉可以通过简单地创建一个新样式并将其分配给ProgressBar的样式属性来更改ProgressBar/ProgressDialog的外观(可绘制).但我不能让它正常工作.这是我到目前为止所做的:

我创建了这样的形状(mp2.xml)

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="ring"
  android:innerRadiusRatio="4"
  android:thicknessRatio="4"
  android:useLevel="false">
 <size android:width="50dip" android:height="50dip" />
 <gradient android:type="sweep" android:useLevel="false" android:startColor="#300000ff" android:centerColor="#500000ff" android:endColor="#ff0000ff" />
</shape>

然后像这样创建了一个动画(mp3.xml):

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:oneshot="false">
 <item android:duration="70">
  <rotate xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/mp2" android:pivotX="50%" android:pivotY="50%" android:fromDegrees="0" android:toDegrees="30" android:repeatCount="1" />
 </item>
 <item android:duration="70">
  <rotate xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/mp2" android:pivotX="50%" android:pivotY="50%" android:fromDegrees="30" android:toDegrees="60" android:repeatCount="1" />
 </item>
 <item android:duration="70">
  <rotate xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/mp2" android:pivotX="50%" android:pivotY="50%" android:fromDegrees="60" android:toDegrees="90" android:repeatCount="1" />
 </item>
 <item android:duration="70">
  <rotate xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/mp2" android:pivotX="50%" android:pivotY="50%" android:fromDegrees="90" android:toDegrees="120" android:repeatCount="1" />
 </item>
 <item android:duration="70"> …