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Attempt to invoke virtual method 'android.view.Window android.app.Activity.getWindow()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.Window android.app.Activity.getWindow()' on a null object reference	at android.support.v7.app.ActionBarDrawerToggle$DrawerArrowDrawableToggle.isLayoutRtl(ActionBarDrawerToggle.java:489)	at android.support.v7.app.DrawerArrowDrawable.draw(DrawerArrowDrawable.java:113)	at android.widget.ImageView.onDraw(ImageView.java:1246)	at android.view.View.draw(View.java:16187)	at android.view.View.updateDisplayListIfDirty(View.java:15184)