AsyncTask + database attempt to invoke virtual method on a null object reference
49
What is a NullPointerException, and how do I fix it?
134746
Where do "pure virtual function call" crashes come from?
60930
How to call asynchronous method from synchronous method in C#?
144423
"No enclosing instance of type" error while calling method from another class in Android
95
Calling virtual functions inside constructors
45196
Calling class method through NULL class pointer
108336
Nullable Object must have a value #2
144658
System.NullPointerException: Attempt to de-reference a null object ,sravn
149666
Why can't a null-reference exception name the object that has a null reference?
98645
How to unit test an object with database queries
3984
How to fix 'android.os.NetworkOnMainThreadException'?
114081
How can I pass a non final variable to an anonymous inner class?
114816
Is null reference possible?
28055
Running multiple AsyncTasks at the same time -- not possible?
12296
How can I return NULL from a generic method in C#?
37552
Using AsyncTask to load Images in ListView
35129
Why does String.valueOf(null) throw a NullPointerException?