Using the Google Drive API - how to show the list of folders in the root folder

Question

I’m trying to create an Android application so that the user can browse and select files from their Google Drive.

I am completely new to Android, and I tried to use samples. When I launch the APK on my phone, authentication seems to work fine, but I'm not sure how to retrieve and display Drive folders.

• How can they be found?
• What should they appear in ( ListView?) So that users can navigate through files?

My onConnected code is working fine, but I think the problem is with DriveId not populating correctly.

@Override
    public void onConnected(Bundle connectionHint) {
        Log.i(TAG, "API client connected.");
        super.onCreate(connectionHint);
        setContentView(R.layout.activity_listfiles);
        mResultsListView = (ListView) findViewById(R.id.listViewResults);
        mResultsAdapter = new ResultsAdapter(this);
        mResultsListView.setAdapter(mResultsAdapter);


        Drive.DriveApi.fetchDriveId(getGoogleApiClient(), EXISTING_FOLDER_ID)
                .setResultCallback(idCallback);

    }

I have a layout called "activity_listfiles.xml". On this layout, it's just a ListView called: @ id / listViewResults

, DriveID: DriveId. ?

final private ResultCallback<DriveIdResult> idCallback = new ResultCallback<DriveIdResult>() {
    @Override
    public void onResult(DriveIdResult result) {
        if (!result.getStatus().isSuccess()) {
            showMessage("Cannot find DriveId. Are you authorized to view this file?");
            return;
        }
        DriveFolder folder = Drive.DriveApi.getFolder(getGoogleApiClient(), result.getDriveId());
        folder.listChildren(getGoogleApiClient())
                .setResultCallback(metadataResult);
    }
};

- ? : https://github.com/googledrive/android-demos/tree/master/src/com/google/android/gms/drive/sample/demo

java ResultsAdapter, , :

public class ResultsAdapter extends DataBufferAdapter<Metadata> {

    public ResultsAdapter(Context context) {
        super(context, android.R.layout.simple_list_item_1);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = View.inflate(getContext(),
                    android.R.layout.simple_list_item_1, null);
        }
        Metadata metadata = getItem(position);
        TextView titleTextView =
                (TextView) convertView.findViewById(android.R.id.text1);
        titleTextView.setText(metadata.getTitle());
        return convertView;
    }
}

, String EXISTING_FOLDER_ID BaseActivity.java, :

public static final String EXISTING_FOLDER_ID = "0B2EEtIjPUdX6MERsWlYxN3J6RU0";

, - ?

:

    EXISTING_FOLDER_ID =  Drive.DriveApi.getRootFolder(getGoogleApiClient()).getDriveId().toString();

    showMessage(EXISTING_FOLDER_ID);

   Drive.DriveApi.fetchDriveId(getGoogleApiClient(),EXISTING_FOLDER_ID)
            .setResultCallback(idCallback);

showMessage DOES , , - - "Can not find DriveID".

, fetchDriveID ?

Answer 1

README https://github.com/googledrive/android-demos/blob/master/README.md

EXISTING_FOLDER_ID, , . , , .