try mContext = this;
That would then be an activity context, not an application context. Although
it might work for the case required (I doubt it - see below), there are
reasons for using one over the other.
http://android-developers.blogspot.co.uk/2009/01/avoiding-memory-leaks.html
It also doesn't help solve the problem of why the OP is getting a
NullPointerException when trying to use the context they collected (if that
is the actual problem they are getting).
Note the first line of the second paragraph:
http://developer.android.com/guide/topics/providers/content-providers.html
"When you want to access data in a content provider, you use the
ContentResolver object in your *application's* Context"
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