使用Google Drive API - 如何在根文件夹中显示文件夹列表

Question

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

I am totally new to Android and I have been mostly trying to use the samples. When I run the APK on my phone, the authentication seems to work ok, but I am not sure how to retrieve and display the Drive folders.

1. How can they be retrieved?
2. What should they be displayed in ( ListView ?) so that users can navigate to the files?

My onConnected code is working ok, but I think the problem is to do with the DriveId not being populated 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 that layout is it just a ListView called: @id/listViewResults

The code is going into this method as I am getting the DriveID error message: Cannot find DriveId. Are you authorized to view this file?

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);
    }
};

Can anyone point me in the right direction? I am using the following as a guide: https://github.com/googledrive/android-demos/tree/master/src/com/google/android/gms/drive/sample/demo

Here is the ResultsAdapter java file, I'm not sure what it does or if I need to change it:

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;
    }
}

I should add that the String EXISTING_FOLDER_ID is in a BaseActivity.java, and the line of code looks like:

public static final String EXISTING_FOLDER_ID = "0B2EEtIjPUdX6MERsWlYxN3J6RU0";

I take it I need to populate this with an ID somehow?

I tried using:

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

    showMessage(EXISTING_FOLDER_ID);

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

The showMessage DOES display an ID - so it IS fetching the root folder ID, but for some reason it still shows the "Cannot find DriveID" message.

So the fetchDriveID is failing?

Answer 1

Please see the need of the README here https://github.com/googledrive/android-demos/blob/master/README.md

You need to change EXISTING_FOLDER_ID to point to a the resource id of a Drive folder that your application has access to. For example, you could create a new folder and then use that ID.