Crashes when switching back to foreground

[SaschaHa]

Hey Daniel,

thanks for this great library! I use it in one of my apps :-)

I've noticed some crashes when switching back to my app. It happens not often, but sometimes. I've noticed the same issue in the sample app.

I haven't found the issue by myself. Maybe you know what's wrong. Thanks!

Best regards,
Sascha

Here is the log I got from my users:

java.lang.IllegalStateException: Matrix can not be modified
at android.graphics.Matrix$1.oops(Matrix.java:40)
at android.graphics.Matrix$1.postTranslate(Matrix.java:154)
at com.saschaha.base.Libs.Depth.DepthLayout.b(Unknown Source)
at com.saschaha.base.Libs.Depth.c.onPreDraw(Unknown Source)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:879)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2129)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1234)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6465)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:803)
at android.view.Choreographer.doCallbacks(Choreographer.java:603)
at android.view.Choreographer.doFrame(Choreographer.java:573)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:789)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:157)
at android.app.ActivityThread.main(ActivityThread.java:5356)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
at dalvik.system.NativeStart.main(Native Method)