ShareActionProvider is null

Question

I have been searching for 3 or 4 days about a solution on this. I have tried: Null Pointer exception in using support library share action provider or why MenuItemCompat.getAct

Answer 1

You have wrong namespace usage in XML:

android="http://schemas.android.com/apk/res/android"             xmlns:app="http://schemas.android.com/apk/res-auto">

  android:actionProviderClass="android.support.v7.widget.ShareActionProvider"

should be app:actionProviderClass (the provider class is from apk resources, not native android classes).

See https://stackoverflow.com/a/32602896/907576