android - Adding rows into Cursor manually

Question

I have an array of phone numbers and I want to get the corresponding contact names from the contacts database.

In the array of phone numbers, I also have some numbers that are not saved before to the contact database. For example;

• 3333333 -> Tim
• 5555555 -> Jim
• 1111111 -> unknown

I have the array containing the phone numbers shown above, namely phoneArr.

int size=phoneArr.size();
if(size>0){
        Cursor[] cursors=new Cursor[size];
        for(int i=0;i<size;i++){
            Uri contactUri1 = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneArr.get(i)));
            cursors[i] = getContentResolver().query(contactUri1, PEOPLE_PROJECTION, null, null, " _id asc limit 1");
        }
        Cursor phones=new MergeCursor(cursors);

phones.getCount() returns 2 in the above scenario. When the phone number does not appear in the contact list the cursor becomes empty and somehow when I merge them it doesn't contribute anything at all. What I want is to have a cursor as follows

Cursor phones -> {Tim, Jim, 1111111}

I think I can do this by adding the row manually as follows:

Uri contactUri1 = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneArr.get(i)));
cursors[i] = getContentResolver().query(contactUri1, PEOPLE_PROJECTION, null, null, " _id asc limit 1");
if(cursors[i].getCount()==0)
    // add the phone number manually to the cursor

How can I achieve this?

Here is the PEOPLE_PROJECTION

private static final String[] PEOPLE_PROJECTION = new String[] {
    ContactsContract.PhoneLookup._ID,
    ContactsContract.PhoneLookup.DISPLAY_NAME,
    ContactsContract.PhoneLookup.NUMBER
};

Answer 1

Easiest way to add rows in a cursor is to use a MatrixCursor and a MergeCursor. Those two classes are from the SDK and here to solve that kind of problems.

Basically what you do is :

1. Put the rows you want to add in a MatrixCusror
2. Merge your cursor and your matrixCursor using a MergeCursor

Something like:

// Create a MatrixCursor filled with the rows you want to add.
MatrixCursor matrixCursor = new MatrixCursor(new String[] { colName1, colName2 });
matrixCursor.addRow(new Object[] { value1, value2 });

// Merge your existing cursor with the matrixCursor you created.
MergeCursor mergeCursor = new MergeCursor(new Cursor[] { matrixCursor, cursor });

// Use your the mergeCursor as you would use your cursor.