ItemContentProvider

public class ItemContentProvider extends ContentProvider {

   @Override

   public boolean onCreate() { return true; }

   @Nullable

   @Override

   public Cursor query(@NonNull Uri uri, @Nullable String[] projection, @Nullable String selection, @Nullable String[] selectionArgs, @Nullable String sortOrder) {

      return null;

   }

   @Nullable

   @Override

   public String getType(@NonNull Uri uri) {

      return null;

   }

   @Nullable

   @Override

   public Uri insert(@NonNull Uri uri, @Nullable ContentValues contentValues) {

      return null;

   }

   @Override

   public int delete(@NonNull Uri uri, @Nullable String s, @Nullable String[] strings) {

      return 0;

   }

   @Override

   public int update(@NonNull Uri uri, @Nullable ContentValues contentValues, @Nullable String s, @Nullable String[] strings) {

      return 0;

   }

}