Google Drive Android API onChildrenRetrievedCallback - google-drive-api

Question

I'm building an app and trying to view a PDF stored in a shared Google Drive folder in-app. I've already connected to the Drive and I have a GoogleApiClient already set up. Right now I'm querying the database and trying to handle the results, but I'm having trouble with this code:
Query query = new Query.Builder().addFilter(Filters.and(
Filters.eq(SearchableField.TITLE, "sample_pdf.pdf"),
Filters.eq(SearchableField.MIME_TYPE, "application/vnd.google-apps.file")))
.build();
Drive.DriveApi.query(googleApiClient, query)
.setResultCallback(new OnChildrenRetrievedCallback() {
#Override
public void onChildrenRetrieved(MetadataBufferResult result) {
// Iterate over the matching Metadata instances in mdResultSet
}
});
Android Studio is not able to resolve the class OnChildrenRetrievedCallback. I have imported the com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks package but I'm not sure what else to do here. Any help?

Answer 1

Try this:
/********************************************************************
* find file/folder in GOODrive
* #param prnId parent ID (optional), null searches full drive, "root" searches Drive root
* this is a String representation of DriveId (DriveId.encodeToString()
* #param titl file/folder name (optional)
* #param mime file/folder mime type (optional)
* #return void (arraylist of found objects in callback)
*/
static void find(String prnId, String titl, String mime) {
// add query conditions, build query
ArrayList<Filter> fltrs = new ArrayList<>();
if (prnId != null){
fltrs.add(Filters.in(SearchableField.PARENTS,
prnId.equalsIgnoreCase("root") ?
Drive.DriveApi.getRootFolder(mGAC).getDriveId() : DriveId.decodeFromString(prnId)));
}
if (titl != null) fltrs.add(Filters.eq(SearchableField.TITLE, titl));
if (mime != null) fltrs.add(Filters.eq(SearchableField.MIME_TYPE, mime));
Query qry = new Query.Builder().addFilter(Filters.and(fltrs)).build();
// fire the query
Drive.DriveApi.query(mGAC, qry).setResultCallback(new ResultCallback<MetadataBufferResult>() {
#Override
public void onResult(MetadataBufferResult rslt) {
if (rslt.getStatus().isSuccess()) {
MetadataBuffer mdb = null;
try {
mdb = rslt.getMetadataBuffer();
for (Metadata md : mdb) {
if (md == null || !md.isDataValid() || md.isTrashed()) continue;
// collect files
DriveId driveId = md.getDriveId();
String dId = driveId.encodeToString();
String mime = md.getMimeType();
//.....
}
} finally { if (mdb != null) mdb.close(); } // don't know if necessary
}
}
});
}
Your mimeType filter doesn't look right, either. I suggest skipping the mimeType filter, search by name(title) only and double-check the mime type you're getting (the md.getMimeType() in the code above).
BEWARE! File name/title IS NOT UNIQUE IDENTIFIER in the GooDrive universe
ONE MORE BEWARE! You will not see the file if t was not created by your Android App (see GDAA supported SCOPES).
Good Luck