自定义ProgressBar的style

1.在anim文件夹下创建旋转动画xml

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/loading"
    android:fromDegrees="0"
    android:toDegrees="360"
    android:pivotX="50%"
    android:pivotY="50%">
</rotate>

2.在style.xml文件夹下创建新的style

<style name="progressbar">
     <item name="android:indeterminateDrawable">@drawable/progress</item>
     <item name="android:minWidth">80dp</item>
     <item name="android:maxWidth">80dp</item>
     <item name="android:minHeight">80dp</item>
     <item name="android:maxHeight">80dp</item>
</style>

3.布局文件中引用创建的style给progressbar

<ProgressBar
      style="@style/progressbar"
      android:indeterminateDuration="1000"
      android:layout_width="200dp"
      android:layout_height="200dp" />