App Folder files not visible after un-install / re-install

Question

I noticed this in the debug environment where I have to do many re-installs in order to test persistent data storage, initial settings, etc... It may not be relevant in prod

Answer 1

Try this approach:

Use requestSync() in onConnected() as:

@Override
public void onConnected(Bundle connectionHint) {
    super.onConnected(connectionHint);
    Drive.DriveApi.requestSync(getGoogleApiClient()).setResultCallback(syncCallback);
}

Then, in its callback, query the contents of the drive using:

final private ResultCallback syncCallback = new ResultCallback() {
    @Override
    public void onResult(@NonNull Status status) {
        if (!status.isSuccess()) {
            showMessage("Problem while retrieving results");
            return;
        }
        query = new Query.Builder()
                .addFilter(Filters.and(Filters.eq(SearchableField.TITLE, "title"),
                        Filters.eq(SearchableField.TRASHED, false)))
                .build();
        Drive.DriveApi.query(getGoogleApiClient(), query)
                .setResultCallback(metadataCallback);
    }
};

Then, in its callback, if found, retrieve the file using:

final private ResultCallback metadataCallback =
        new ResultCallback() {
    @SuppressLint("SetTextI18n")
    @Override
    public void onResult(@NonNull DriveApi.MetadataBufferResult result) {
        if (!result.getStatus().isSuccess()) {
            showMessage("Problem while retrieving results");
            return;
        }

        MetadataBuffer mdb = result.getMetadataBuffer();
        for (Metadata md : mdb) {
            Date createdDate = md.getCreatedDate();
            DriveId driveId = md.getDriveId();
        }

        readFromDrive(driveId);
    }
};

Job done!

Hope that helps!