Android 显示进度条
<ProgressBar android:id="@+id/progressBar" style="?android:attr/progressBarStyleLarge" android:layout_width="50dp" android:layout_height="50dp" mce_style="?android:attr/progressBarStyleLarge" android:indeterminateDrawable="@drawable/progressbar2" /> <!-- mce_style="?android:attr/progressBarStyleLarge" -->
progressbar2.xml 在Drawable文件夹
<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android" android:drawable="@drawable/loadingbar" android:pivotX="50%" android:pivotY="50%" />