Unable to retrieve Google Drive files and folders using new Drive API
android, google-api-java-client, google-drive-api
Solution
The Drive API grants access only to two classes of files:
- Files that a user has created with a given Drive app
- Files that a user opens with a given Drive app
For security reasons, there's no method to list all files in a user Drive account:
https://developers.google.com/drive/apps_overview#granting_file-level_access
For more options in the Android environment, check out these other answers:
- Android API for Google Drive?
- Google Drive\Docs API for Android
Problem
I am trying to get a list of Files in a Folder from Google Drive from my Android app but have been unsuccessful so far. I'm using google-api-drive-v1-rev4-java-1.6.0-beta and google-api-client-1.9.0. I'm also building my code similar to calendar-android-sample and tasks-android-sample from the samples at http://code.google.com/p/google-api-java-client/wiki/Android. I cant seem to find how to use files() to get a list of folders or even the id of the folder I want. The tasks-android-sample uses '@default' in the get() method to get a list of tasks. What would I use in the get method to get a list of folders first, search for my folder, get the id, then get a list of files in that folder? AsyncLoadDocs.java: (Note: I'm using getFields() just to see if the Get object contains any metadata, which at this point doesn't.) ``` package com.mysite.myapp.docs; import com.google.api.services.drive.Drive; import com.google.api.services.drive.Drive.Files; import com.google.api.services.drive.Drive.Files.Get; import com.google.api.services.drive.model.File; import android.app.ProgressDialog; import android.os.AsyncTask; import android.util.Log; import android.widget.ArrayAdapter; import java.io.IOException; import java.util.ArrayList; import java.util.Collections; import java.util.List; /** * Asynchronously load the docs with a progress dialog. * * @author ms */ class AsyncLoadDocs extends AsyncTask<Void, Void, List<String>> { private static final String TAG = "AsyncLoadDocs"; private final GDocsSync gDocsSync; private final ProgressDialog dialog; private final Drive entry = null; private com.google.api.services.drive.Drive service; AsyncLoadDocs(GDocsSync gDocsSync) { this.gDocsSync = gDocsSync; service = gDocsSync.driveClient; dialog = new ProgressDialog(gDocsSync); } @Override protected void onPreExecute() { dialog.setMessage("Loading docs..."); dialog.show(); } @Override protected List<String> doInBackground(Void... arg0) { try { List<String> folderNames = new ArrayList<String>(); Get get = service.files().get("@default").setProjection("FULL"); String fields = get.getFields(); Log.d(TAG, "Fields: " + fields); return folderNames; } catch (IOException e) { gDocsSync.handleGoogleException(e); return Collections.singletonList(e.getMessage()); } finally { gDocsSync.onRequestCompleted(); } } @Override protected void onPostExecute(List<String> result) { dialog.dismiss(); } } ``` Any help would be appreciated. Both Calendar and Tasks samples successfully retrieve data from Google using my API key, why doesn't this Drive code?