Upload JSON file to Google Drive using Google Drive API for android programatically

Question

I know from the sample code how to upload a text file into the Drive AppFolder, but from the docs is not clear how to extend it to JSON, if it's possible at all.

Here is the code for uploading a Text File:

final private ResultCallback<DriveContentsResult> driveContentsCallback = new
        ResultCallback<DriveContentsResult>() {
    @Override
    public void onResult(DriveContentsResult result) {
        if (!result.getStatus().isSuccess()) {
            showMessage("Error while trying to create new file contents");
            return;
        }
        final DriveContents driveContents = result.getDriveContents();

        // Perform I/O off the UI thread.
        new Thread() {
            @Override
            public void run() {
                // write content to DriveContents
                OutputStream outputStream = driveContents.getOutputStream();
                Writer writer = new OutputStreamWriter(outputStream);
                try {
                    writer.write("Hello World!");
                    writer.close();
                } catch (IOException e) {
                    Log.e(TAG, e.getMessage());
                }

                MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
                        .setTitle("New file")
                        .setMimeType("text/plain")
                        .setStarred(true).build();

                // create a file on root folder
                Drive.DriveApi.getRootFolder(getGoogleApiClient())
                        .createFile(getGoogleApiClient(), changeSet, driveContents)
                        .setResultCallback(fileCallback);
            }
        }.start();
    }
};

I need to change the .setMimeType() and the outputStream, but to what exactly?

my JSON String is declared as follows:

String json = gson.toJson(activeSubs); //activeSubs being an ArrayList

Any help is appreciated.

Answer 1

This fixed it for me:

String json = gson.tojson(activeSubs);

final private ResultCallback<DriveContentsResult> driveContentsCallback = new
        ResultCallback<DriveContentsResult>() {
    @Override
    public void onResult(DriveContentsResult result) {
        if (!result.getStatus().isSuccess()) {
            showMessage("Error while trying to create new file contents");
            return;
        }
        final DriveContents driveContents = result.getDriveContents();

        // Perform I/O off the UI thread.
        new Thread() {
            @Override
            public void run() {
                // write content to DriveContents
                OutputStream outputStream = driveContents.getOutputStream();
                Writer writer = new OutputStreamWriter(outputStream);
                try {
                    writer.write(json);
                    writer.close();
                } catch (IOException e) {
                    Log.e(TAG, e.getMessage());
                }

                MetadataChangeSet changeSet = new MetadataChangeSet.Builder()
                        .setTitle("New file.txt")
                        .setMimeType("json")
                        .setStarred(true).build();

                // create a file on root folder
                Drive.DriveApi.getRootFolder(getGoogleApiClient())
                        .createFile(getGoogleApiClient(), changeSet, driveContents)
                        .setResultCallback(fileCallback);
            }
        }.start();
    }
};