What is cursor.setNotificationUri() used for?

Question

I did research on how to use ContentProviders and Loaders from this tutorial

How I see it: We have an Activity with ListView,

Answer 1

I use one URI for the cursor adaptor.

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    Bundle args = new Bundle();
    Uri uri = TemperatureContract.SensorEntry.buildSensorID0AddressUri(mDeviceAddress);
    args.putParcelable("URI", uri);
    getSupportLoaderManager().initLoader(0, args, this);

}

@Override
public Loader onCreateLoader(int id, Bundle args) {
    if (args != null) {
        Uri mUri = args.getParcelable("URI");
        return new CursorLoader(this,
                mUri,
                null, // projection
                null, // selection
                null, // selectionArgs
                null); // sortOrder
    } else {
        return null;
    }
}

On another class, I use a different URI to change the database contents. To have my view updated, I had to change the default implementation of the data provider's update method. The default implementation only notifies the same URI. I have to notify another URI.

I ended up by calling the notifyChange() twice on my data provider class, on the update method:

@Override
public int update(
        Uri uri, ContentValues values, String selection, String[] selectionArgs) {
    final SQLiteDatabase db = mOpenHelper.getWritableDatabase();
    final int match = sUriMatcher.match(uri);
    int rowsUpdated;
    switch (match) {
        case ...:
            break;
        case SENSOR_BY_ID_AND_ADDRESS:
            String sensorId = TemperatureContract.SensorEntry.getSensorIdFromUri(uri);
            String sensorAddress = TemperatureContract.SensorEntry.getSensorAddressFromUri(uri);
            rowsUpdated = db.update(
                    TemperatureContract.SensorEntry.TABLE_NAME, values, "sensorid = ? AND address = ?", new String[]{sensorId, sensorAddress});
            if (rowsUpdated != 0) {
                Uri otheruri = TemperatureContract.SensorEntry.buildSensorID0AddressUri(sensorAddress);
                getContext().getContentResolver().notifyChange(otheruri, null);
            }
            break;
        case ...:
            break;
        default:
            throw new UnsupportedOperationException("Unknown uri: " + uri);
    }
    if (rowsUpdated != 0) {
        getContext().getContentResolver().notifyChange(uri, null);
    }
    return rowsUpdated;

I did the same for the insertand delete methods.