How to use getContentResolver() inside non activity class?

Question

I am trying to create a method which retrieves contact name for the given input string. For that I have to use getContentResolver method. To use the context I am passing the context as the parameter. But still the following error is populating.

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.ContentResolver android.content.Context.getContentResolver()' on a null object reference

public class GetContactName {

    public static String getContactName(Context context, String phoneNumber) {
        Uri uri = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneNumber));

        String[] projection = new String[]{ContactsContract.PhoneLookup.DISPLAY_NAME};

        String contactName = "";
        Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null);

        if (cursor != null) {
            if (cursor.moveToFirst()) {
                contactName = cursor.getString(0);
            }
            cursor.close();
        }

        return contactName;
    }

}

Please help me to solve this

You are passing `null` as context in `getContactName`. – ADM Jan 08 '20 at 09:39 — ADM, Jan 08 '20 at 09:39
From where are you calling this method .. – ADM Jan 08 '20 at 09:43 — ADM, Jan 08 '20 at 09:43

Hari Krishnan · Accepted Answer · 2020-01-08T09:56:04.270

2

While calling getContactName(), call that with non null attribute

getContactName(getActivity(), phoneNumber);

where getActivity() represents the context of the class from where you are calling this method. You may be passing a null reference instead of passing the proper context.

edited Jan 08 '20 at 09:56

answered Jan 08 '20 at 09:44

Hari Krishnan

5,992
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If I use `this` it says `Change 1st parameter of method from Context to MyFragment` So I created a global context variable and used here – deluxan Jan 08 '20 at 09:51
1

So you are calling this function from a fragment. Then instead of passing 'this' pass the context of the class from where you are calling the fragment. – Hari Krishnan Jan 08 '20 at 09:54
1

@deluxan use `getActivity()` in `fragment` instead of this i.e `getContactName(getActivity(), phoneNumber);` – Shadow Droid Jan 08 '20 at 09:56
1

I have edited the answer. please check. – Hari Krishnan Jan 08 '20 at 09:56

score 0 · Answer 2 · answered Jan 08 '20 at 09:48

0

you can create one singleton class for the app form it's instance you can access contentResolver()

answered Jan 08 '20 at 09:48

Black mamba

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How to use getContentResolver() inside non activity class?

2 Answers2