为什么动画在屏幕上重新启动然后又关闭又打开？

Question

I am using a landscape-only app. There is an activity and animation. Animation is started in onCreate via startAnimation() method. So nothing unusual and nothing unordinary.

When animation ends, I turn screen off and then on, and the animations restarts !

Why is this happening and how to prevent this?

Since the app in in landscape only mode and Android screen off is in portrait, is this causing animation restart?

I haven't found such cases on the net.

Answer 1

Turning screen OFF and then ON indeed restarts the Activity .

So anyone facing the same problems, just add the usual attribute into the Manifest file next to the Activity where the animations occur.

Like this:

<activity android:name=".MyActivity" 
          android:configChanges="orientation|keyboardHidden" /> 

Answer 2

A simple way to check all this is to put Log in all onCreate , onResume , ... methods. Then, you should be able to see which methods are called during your tests.

Anyway, passing from Portrait to Landscape (or from Landscape to Portrait) and turning your screen off and on will probably restart the activity.