commentFile.java

private void commentFile() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    if (mAccessToken == null) {
                        Log.d(TAG, "need to sign in first");
                        return;
                    }
                    if (fileSearched == null) {
                        Log.d(TAG, "query file first");
                        return;
                    }
                    if (StringUtils.isNullOrEmpty(et_comment.getText().toString())) {
                        Log.d(TAG, "file name is required to comment");
                        return;
                    }

                    Drive drive = buildDrive();
                    Comment comment = new Comment();
                    comment.setDescription(et_comment.getText().toString());
                    mComment = drive.comments()
                            .create(fileSearched.getId(), comment)
                            .setFields("*")
                            .execute();

                    if (mComment != null && mComment.getId() != null) {
                        Log.d(TAG, "add comment success");
                    } else {
                        Log.d(TAG, "add comment failed");
                    }

                } catch (Exception e) {
                    Log.d(TAG, "add comment failed" + e.toString());
                }
            }
        }).start();
    }