Null Pointer exception in using support library share action provider

Question

Below is the code of my Activity . In this I am using the support library appcompat

   import android.content.Intent;
   import android.os.Bundle;
   import          


        

Answer 1

If this line

shareAction.setShareIntent(shareIntent);

is throwing a NullPointerException, this sentence

(ShareActionProvider) MenuItemCompat.getActionProvider(item);

must be returning null.

Have a look at the post below, which talks about reasons why this would happen.

NullPointerException on setShareIntent using ActionBarSherlock

Answer 2

I found the error. The problem was that support library requires to have a custom prefix and not android:actionProviderClass . What i was doing wrong that i used android:actionProviderClass instead of customprefix:actionProviderClass

See here: https://developer.android.com/training/basics/actionbar/adding-buttons.html

Answer 3

I changed this

android:actionProviderClass=widget.ShareActionProvider" />

To this

app:actionProviderClass=support.v7.widget.ShareActionProvider" />