Google API v3 checking exist folder by passing folder name

Question

I'm using google API v3 for check exist folder. If folder does not exist, then create the new folder. This is my code for creating folder

 private void createFolderInDrive() throws IOException {
        boolean existed = checkExistedFolder("MyFolder");

        if (existed = false) {
            File fileMetadata = new File();
            fileMetadata.setName("MyFolder");
            fileMetadata.setMimeType("application/vnd.google-apps.folder");

            File file = mService.files().create(fileMetadata)
                    .setFields("id")
                    .execute();
            System.out.println("Folder ID: " + file.getId());

            Log.e(this.toString(), "Folder Created with ID:" + file.getId());



       Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(getApplicationContext(),
                    "Folder is existed already", Toast.LENGTH_SHORT).show();
        }


    }

and here is the code for checking exist file

private boolean checkExistedFolder(String folderName) {
        //File file = null;
        boolean existedFolder = true;
        // check if the folder exists already
        try {
            //String query = "mimeType='application/vnd.google-apps.folder' and trashed=false and title='" + "Evacuation Kit" + "'";
            String query = "mimeType='application/vnd.google-apps.folder' and trashed=false and name='Evacuation Kit'";
            // add parent param to the query if needed
            //if (parentId != null) {
            //query = query + " and '" + parentId + "' in parents";
            // }

            Drive.Files.List request = mService.files().list().setQ(query);
            FileList fileList = request.execute();

            if (fileList.getFiles().size() == 0 ) {
                // file = fileList.getFiles().get(0);
                existedFolder = false;

            }


        } catch (IOException e) {
            e.printStackTrace();

        }
        return existedFolder;

fileList.getFiles().size() keep returning 3, even there is no folder on g drive. Can you guys tell me where am I doing wrong?

score 1 · Answer 1 · answered Jun 18 '19 at 18:40

In the code you show, checkExistedFolder is always looking for the name "Evacuation Kit" and not using the argument folderName. Maybe this is the main reason you're always getting 3 from fileList.getFiles().size().

Also there's an assignment in if (existed = false), you should use if ( false == existed ) -using the static value in the left side of the comparison helps avoiding such mistakes-, or if (!existed). Note that it's important to check the nextPageToken when calling Files:list to check if there is more pages to look for the file. See more here https://developers.google.com/drive/api/v3/reference/files/list and Create folder if it does not exist in the Google Drive

Niraj Prajapati · Answer 2 · 2018-05-14T09:54:13.277

This code will check if folder exist on drive. if exists, it will return id else create folder and returns id.

private DriveFile file;

GoogleApiClient mGoogleApiClient;

@Override
public void onConnected(@Nullable Bundle bundle) {
    Log.e(TAG, "connected");
    new Thread(new Runnable() {
        @Override
        public void run() {
            DriveId Id = getFolder(Drive.DriveApi.getRootFolder(mGoogleApiClient).getDriveId(), "FOLDER_NAME");
            Log.e(TAG, "run: " + Id);
        }
    }).start();
}

DriveId getFolder(DriveId parentId, String titl) {
    DriveId dId = null;
    if (parentId != null && titl != null) try {
        ArrayList<Filter> fltrs = new ArrayList<>();
        fltrs.add(Filters.in(SearchableField.PARENTS, parentId));
        fltrs.add(Filters.eq(SearchableField.TITLE, titl));
        fltrs.add(Filters.eq(SearchableField.MIME_TYPE, DriveFolder.MIME_TYPE));
        Query qry = new Query.Builder().addFilter(Filters.and(fltrs)).build();

        MetadataBuffer mdb = null;
        DriveApi.MetadataBufferResult rslt = Drive.DriveApi.query(mGoogleApiClient, qry).await();
        if (rslt.getStatus().isSuccess()) try {
            mdb = rslt.getMetadataBuffer();
            if (mdb.getCount() > 0)
                dId = mdb.get(0).getDriveId();
        } catch (Exception ignore) {
        } finally {
            if (mdb != null) mdb.close();
        }

        if (dId == null) {
            MetadataChangeSet meta = new MetadataChangeSet.Builder().setTitle(titl).setMimeType(DriveFolder.MIME_TYPE).build();
            DriveFolder.DriveFolderResult r1 = parentId.asDriveFolder().createFolder(mGoogleApiClient, meta).await();
            DriveFolder dFld = (r1 != null) && r1.getStatus().isSuccess() ? r1.getDriveFolder() : null;
            if (dFld != null) {
                DriveResource.MetadataResult r2 = dFld.getMetadata(mGoogleApiClient).await();
                if ((r2 != null) && r2.getStatus().isSuccess()) {
                    dId = r2.getMetadata().getDriveId();
                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return dId;
}

out of date API see https://stackoverflow.com/a/63922175/6352712 — Serg Burlaka, Sep 16 '20 at 14:25

score 0 · Answer 3 · answered Sep 16 '20 at 14:25

The code working for me with updated API on Kotlin:

 override fun createFolder(name: String): Task<GoogleDriveFileHolder> {

        check(googleDriveService != null) { "You have to init Google Drive Service first!" }
        check(search(name, FOLDER_MIME_TYPE).not()){"folder already exist"}

        return Tasks.call<GoogleDriveFileHolder>(
            mExecutor,
            Callable<GoogleDriveFileHolder> {

                val metadata = File()
                    .setMimeType(FOLDER_MIME_TYPE)
                    .setName(name)

                GoogleDriveFileHolder(
                    googleDriveService!!.files()
                        .create(metadata)
                        .setFields("id")
                        .execute() ?: throw IOException("Null result when requesting file creation.")
                )
            })
    }

    private fun search(name: String, mimeType:String): Boolean {

        var pageToken: String? = null

        do {

            val result: FileList =
                googleDriveService!!
                    .files()
                    .list()
                    .setQ("mimeType='$FOLDER_MIME_TYPE'")
                    .setSpaces("drive")
                    .setFields("nextPageToken, files(id, name)")
                    .setPageToken(pageToken)
                    .execute()

            for (file in result.files) {
                Log.d(TAG_UPLOAD_FILE , "Found file: %s (%s)\n ${file.name}, ${file.id} ")
                if (name == file.name) return true
            }

            pageToken = result.nextPageToken

        } while (pageToken != null)

        return false
    }

private const val FOLDER_MIME_TYPE= "application/vnd.google-apps.folder"

Google API v3 checking exist folder by passing folder name

3 Answers3