CODEWITHSUNDEEP
androidsqliteandroid-cursoradapter
Enovyne
Enovyne

Reputation: 195

The constructor CursorLoader is undefined

I am trying to retrieve rows of locations from my SQLiteTable but I ran into a compilation error, the constructor CursorLoader is undefined. 

@Override
public Loader<Cursor> onCreateLoader(int arg0,
    Bundle arg1) {

    // Uri to the content provider LocationsContentProvider
    Uri uri = LocationsContentProvider.CONTENT_URI;

    // Fetches all the rows from locations table

    //return new CursorLoader(null);
   //(Context context, Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder)

    /ERROR HERE
    return new CursorLoader(this, null, null, null, null);
}

In LocationsContentProvider.java

 /** A callback method which is invoked by default content uri */
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {

    if(uriMatcher.match(uri)==LOCATIONS){
        return mLocationsDB.getAllLocations();
    }
    return null;
}

Upvotes: 0

Views: 139

Answers (2)

Shayan Pourvatan
Shayan Pourvatan

Reputation: 11948

Cursor Loader constructor get following property :

public CursorLoader(Context context, Uri uri, String[] projection, String selection,
            String[] selectionArgs, String sortOrder) {
        super(context);
        mObserver = new ForceLoadContentObserver();
        mUri = uri;
        mProjection = projection;
        mSelection = selection;
        mSelectionArgs = selectionArgs;
        mSortOrder = sortOrder;
    }

you miss one property. you can add one null or define your order and pass to the constructor.

and as CommonsWar said, you must pass your URI as a second argument,

Upvotes: 1

CommonsWare
CommonsWare

Reputation: 1007554

CursorLoader does not have a five-parameter constructor. More importantly, you need to provide the Uri pointing to the collection on the ContentProvider that you are trying to query. You are welcome to say that the final four parameters are null, but add the Uri as the second parameter to the constructor.

You may wish to read the documentation for the six-parameter CursorLoader constructor that you will be using.

Also note that the code in your first code snippet will not compile, as you are missing a comma between two of the null values.

Upvotes: 1

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