【Android】Button 旋轉 90 度 (角度旋轉)

layout

In res/anim/rotate_anim.xml:

<?xml version="1.0" encoding="utf-8"?>
<rotate  xmlns:android="http://schemas.android.com/apk/res/android"
       android:fromDegrees="0" 
       android:toDegrees="-90"
       android:pivotX="50%"
       android:pivotY="50%"
       android:duration="0" />

Java Code

        Button b = (Button) findViewById(R.id.pageBack);

        RotateAnimation ranim = (RotateAnimation) AnimationUtils.loadAnimation(this, R.anim.rotatie_anim);
        ranim.setFillAfter(true); //For the button to remain at the same place after the rotation
        b.setAnimation(ranim);