Android：如何只旋转imageView的可绘制部分？

Question

I have an ImageView object where both its Background and drawable attributes are set. I need to animate the drawable part of the ImageView while the background stay still.

I can't find a way to do it...

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/linear_interpolator"
    android:drawable="@drawable/ic_popup_sync_1"
    android:fromDegrees="0"
    android:pivotX="50%"
    android:pivotY="50%"
    android:repeatCount="infinite"
    android:duration="1200"
    android:toDegrees="360" />

imageView.startAnimation(AnimationUtils.loadAnimation(context, animId));

Both the drawable and the background are rotating at the same time...

Answer 1

Set the background to a separate layout that sits behind the ImageView . Put both into a RelativeLayout where the background View is aligned to the ImageView by left, right, top, and bottom so that the background stays within the image's bounds. Then you can rotate the image freely.

EDIT:

Better yet, but the ImageView inside a layout and set the layout to WRAP_CONTENT . Set the layout's background to your background image.