Task<DriveContents> openFileTask =
        getDriveResourceClient().openFile(file, DriveFile.MODE_READ_ONLY);

   Task<DriveContents> createContentsTask = getDriveResourceClient().createContents();
    createContentsTask
            .continueWithTask(new Continuation<DriveContents, Task<IntentSender>>() {
                @Override
                public Task<IntentSender> then(@NonNull Task<DriveContents> task)
                        throws Exception {
                    DriveContents contents = task.getResult();
                    OutputStream outputStream = contents.getOutputStream();
                    try (Writer writer = new OutputStreamWriter(outputStream)) {
                        writer.write("Hello World!");
                    }

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

                    CreateFileActivityOptions createOptions =
                            new CreateFileActivityOptions.Builder()
                                    .setInitialDriveContents(contents)
                                    .setInitialMetadata(changeSet)
                                    .build();
                    return getDriveClient().newCreateFileActivityIntentSender(createOptions);
                }
            })
            .addOnSuccessListener(this,
                    new OnSuccessListener<IntentSender>() {
                        @Override
                        public void onSuccess(IntentSender intentSender) {
                            try {
                                startIntentSenderForResult(
                                        intentSender, REQUEST_CODE_CREATE_FILE, null, 0, 0, 0);
                            } catch (IntentSender.SendIntentException e) {
                                Log.e(TAG, "Unable to create file", e);
                                showMessage(getString(R.string.file_create_error));
                                finish();
                            }
                        }
                    })
            .addOnFailureListener(this, new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    Log.e(TAG, "Unable to create file", e);
                    showMessage(getString(R.string.file_create_error));
                    finish();
                }
            });