NullPointerException: Attempt to invoke virtual method 'android.graphics.drawable.Drawable android.graphics.drawable.Drawable$ConstantState.newDrawable(android.content.res.Resources)' on a null object reference
    at android.graphics.drawable.DrawableContainer$DrawableContainerState.createAllFutures(DrawableContainer.java:875)
    at android.graphics.drawable.DrawableContainer$DrawableContainerState.getOpacity(DrawableContainer.java:1158)
    at android.graphics.drawable.DrawableContainer.getOpacity(DrawableContainer.java:433)
    at android.graphics.drawable.InsetDrawable.getOpacity(InsetDrawable.java:258)
    at android.view.View.computeOpaqueFlags(View.java:18174)
...
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Attempt to invoke virtual method 'android.graphics.drawable.Drawable android.graphics.drawable.Drawable$ConstantState.newDrawable(android.content.res.Resources)' on a null object reference