why MenuItemCompat.getActionProvider returns null?

Question

I tried to use android.support.v7.widget.ShareActionProvider on actionbar in my app. So I followed the example from android document but got some issues.
Here\'s my m

Answer 1

After some reading and that includes probably some of you responses, finally this issued is solved:

1. Share_Menu.xml. Make sure you have a custom namespace and the actionProvider class is from that custom namespace as well as the correct value: android.support.v7.widget.ShareActionProvider

2. Detail_Activity.java
   2.1. Inherit from ActionBarActivity instead of Activity
   2.2. Add the correct imports

   import android.support.v4.app.Fragment; import android.support.v4.view.MenuItemCompat; import android.support.v7.app.ActionBarActivity; import android.support.v7.widget.ShareActionProvider;

3. AndroidManifest.xml Add the android:theme="@style/Theme.AppCompat.Light"

4. Build.gradle
   4.1. In my case just to stay in the safe side I turn offf ProGuard in Debug.

   debug { runProguard false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' }

4.2. Make sure that you have the following compile section in dependencies

`compile 'com.android.support:appcompat-v7:20.0.+'`