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Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference	at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:658)	at wear.trombettonj.prova2.AnalogWatchface$Engine.onSurfaceChanged(AnalogWatchface.java:126)	at android.service.wallpaper.WallpaperService$Engine.updateSurface(WallpaperService.java:770)	at android.service.wallpaper.WallpaperService$Engine.attach(WallpaperService.java:878)	at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:1165)	at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:37)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:154)	at android.app.ActivityThread.main(ActivityThread.java:5974)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:801)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:691)