android - Why is my rotate animation all wonky when applied to an Activity transition? -

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what below animation supposed do?

<?xml version="1.0" encoding="utf-8"?> <rotate xmlns:android="http://schemas.android.com/apk/res/android"     android:fromdegrees="0"     android:todegrees="360"     android:pivotx="50%"     android:pivoty="50%"     android:interpolator="@android:anim/linear_interpolator"     android:duration="1000" />

easy enough. should represent clockwise rotation centre. spin around once, stop. right?

and does... when apply view.

but when animate activity transition instead, entirely different happens. activity starts rotate counterclockwise, @ same time flies off top right of screen. comes back, still rotating counterclockwise , upside-down, , flies off bottom left of screen. finally, comes , ends rotation upright.

no matter specify pivotx , pivoty, behaviour same. seem ignored completely. , either way, thing not rotating around fixed pivot @ all!

what kind of nonsense this? bug?

for completeness, saved animation res/anim/spin.xml, , invoke follows:

startactivity(intent); overridependingtransition(r.anim.spin, r.anim.spin);

(using same animation both in , out makes no sense, minimal example.)

update: demo app reproduce issue

i've put minimal android project demonstrates problem. main activity looks this:

package com.example.animtest;  import android.app.activity; import android.content.intent; import android.os.bundle; import android.view.view; import android.view.animation.animation; import android.view.animation.animationutils;  public class mainactivity extends activity {      private view rootview;      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         rootview = getlayoutinflater().inflate(r.layout.main, null);         setcontentview(rootview);     }      public void animaterootview(view view) {         animation spin = animationutils.loadanimation(getapplicationcontext(), r.anim.spin);         rootview.setanimation(spin);         spin.start();     }      public void animateactivity(view view) {         intent intent = new intent();         intent.setclassname("com.example.animtest", "com.example.animtest.mainactivity");         startactivity(intent);         overridependingtransition(r.anim.spin, r.anim.spin);     }  }

here zip file project source , runnable apk file. tested on nexus one, android 2.2.2.

known issue .. till 2.3.4 nothing has been done :( http://code.google.com/p/android/issues/detail?id=10402


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