How to change StartDrawable and EndDrawable res programly?

[Kolyall]

I tried:

 mButton.setStartDrawable(VectorDrawable.getDrawable(this, R.drawable.ic_play));
 mButton.setEndDrawable(VectorDrawable.getDrawable(this, R.drawable.ic_pause));

Error is:

 java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Rect android.graphics.drawable.Drawable.getBounds()' on a null object reference

I tried:

 mButton.setStartDrawable(AnimatedVectorDrawable.getDrawable(this, R.drawable.ic_play_animatable));
 mButton.setEndDrawable(AnimatedVectorDrawable.getDrawable(this, R.drawable.ic_pause_animatable));

Error is:

 java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Rect android.graphics.drawable.Drawable.getBounds()' on a null object reference