NPE when using in NavigationView

[naman14]

MaterialDrawableBuilder drawable = MaterialDrawableBuilder.with(this).setColor(Color.WHITE).setIcon(MaterialDrawableBuilder.IconValue.LIBRARY_MUSIC).build();
 navigationView.getMenu().findItem(R.id.nav_library).setIcon(drawable);

Doing this results in NullPointerException in NavgationMenuItemView

java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.drawable.Drawable android.graphics.drawable.Drawable$ConstantState.newDrawable()' on a null object reference
            at android.support.design.internal.NavigationMenuItemView.setIcon(NavigationMenuItemView.java:114)
            at android.support.design.internal.NavigationMenuItemView.setIconTintList(NavigationMenuItemView.java:144)
            at android.support.design.internal.NavigationMenuPresenter$NavigationMenuAdapter.getView(NavigationMenuPresenter.java:325)

This only happens with design support lib 22.2.0.+. Worked fine till 22.2.0. Also broken on v23.

[code-mc]

The MaterialDrawableBuilder drawable should be Drawable drawable but that probably isn't the reason it's doing that I guess if it worked before. What exactly is this referring to, an activity?

[naman14]

My bad ,it should be Drawable but yeah that's a typo here.
this is a Activity. BTW this issue is also reported here-https://code.google.com/p/android/issues/detail?id=180481
And here-
http://stackoverflow.com/questions/31494946/getting-nullpointer-exception-after-updating-to-android-design-support-22-2-1

From what i understand, Drawable.ConstantState always returns null in default behavior. Probably have to override getConstantState() in MaterialDrawable

[code-mc]

This one is hard for me to justify fixing as the default framework behavior is what it currently does. If the support lib uses one of the methods wrong than the report over there is probably the only thing that will fix it in the long run.

A temporary fix would be overriding the MaterialDrawable class and implementing the getConstantState() method there yourself. Cast the Drawable to that overridden one and it should work if I understood everything correctly.

[code-mc]

I have starred the issue btw, I hope it gets fixed asap :)