List all files in Drive

Question

I want to list all files in Root folder of user's Drive using Google Drive API for Android.

What I've tried:

1. Use SCOPE_FILE and listChildren:

   mGoogleApiClient = new GoogleApiClient.Builder(this)
           .addApi(Drive.API)
           .addScope(Drive.SCOPE_FILE)
           .addConnectionCallbacks(this)
           .addOnConnectionFailedListener(this)
           .build();
   

Then list files:

Drive.DriveApi.getRootFolder(mGoogleApiClient)
    .listChildren(mGoogleApiClient)
    .setResultCallback(new ResultCallback<DriveApi.MetadataBufferResult>() {
        @Override
        public void onResult(DriveApi.MetadataBufferResult result) {
            if (!result.getStatus().isSuccess()) {
                Log.v("DKDK", "Request failed");
                return;
            }
            MetadataBuffer metadataBuffer = result.getMetadataBuffer(); // empty!
        }
    }

I've found that SCOPE_FILE only list files that were created by the app, not all files.

2. Use https://www.googleapis.com/auth/drive scope

   mGoogleApiClient = new GoogleApiClient.Builder(this)
           .addApi(Drive.API)
           .addScope(new Scope("https://www.googleapis.com/auth/drive"))
           .addConnectionCallbacks(this)
           .addOnConnectionFailedListener(this)
           .build();
   

Fails with exception:

com.google.android.gms.drive.auth.c: Authorization failed: Unsupported scope: https://www.googleapis.com/auth/drive
at com.google.android.gms.drive.auth.g.a(SourceFile:86)
at com.google.android.gms.drive.api.e.<init>(SourceFile:230)
at com.google.android.gms.drive.api.a.q.a(SourceFile:71)
at com.google.android.gms.common.service.f.run(SourceFile:176)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
at com.google.android.gms.common.util.a.c.run(SourceFile:17)
at java.lang.Thread.run(Thread.java:856)

Is it intended to work this way, or I'm missing something?

Answer 1

You can't list all files (files that wasn't created by your app) with Google Drive API (Android library). You should use Google Drive REST API.

The scope that you are trying to use is for REST API.

Here is from docs page:

Note: The Android Drive API only works with the https://www.googleapis.com/auth/drive.file scope. This means that only files which a user has opened or created with your application can be matched by a query.

https://developers.google.com/drive/android/queries