// google
    static final int REQUEST_ACCOUNT_PICKER = 1;
    static final int REQUEST_AUTHORIZATION = 2;
    static final int CAPTURE_IMAGE = 3;
    private GoogleAccountCredential credential;
    private static Uri fileUri;
    private static Drive service;

    public void onLoginGoogle(View v) {
        credential = GoogleAccountCredential.usingOAuth2(this, DriveScopes.DRIVE);
        startActivityForResult(credential.newChooseAccountIntent(), REQUEST_ACCOUNT_PICKER);
    }

    public void onUploadGoogle(View v) {
        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    // File's binary content
                    java.io.File fileContent = new java.io.File("/sdcard/a.jpg");
                    FileContent mediaContent = new FileContent("image/jpeg", fileContent);

                    // File's metadata.
                    com.google.api.services.drive.model.File body = new com.google.api.services.drive.model.File();
                    body.setTitle(fileContent.getName());
                    body.setMimeType("image/jpeg");

                    com.google.api.services.drive.model.File file = service.files().insert(body, mediaContent).execute();
                    if (file != null) {
                        showToast("Photo uploaded: " + file.getTitle());
                        // startCameraIntent();
                    }
                } catch (UserRecoverableAuthIOException e) {
                    startActivityForResult(e.getIntent(), REQUEST_AUTHORIZATION);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
        t.start();
    }

    public void onDownloadGoogle(View v) {
        downloadFile();
    }

    private void downloadFile() {
        Thread thread = new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    com.google.api.services.drive.model.File file = service.files().get("0B-Iak7O9SfIpYk9zTjZvY2xreVU").execute();
                    // FileList file = service.files().list().execute();
                    // List<com.google.api.services.drive.model.File> fileList =
                    // file.getItems();
                    // com.google.api.services.drive.model.File fileItem =
                    // fileList.get(0);
                    // Log.d("FileID" , fileItem.getId());
                    // Log.d("Count", "Retreived file list");
                    if (file.getDownloadUrl() != null && file.getDownloadUrl().length() > 0) {
                        HttpResponse resp = service.getRequestFactory().buildGetRequest(new GenericUrl(file.getDownloadUrl())).execute();
                        InputStream inputStream = resp.getContent();
                        // writeToFile(inputStream);
                    }
                } catch (IOException e) {
                    Log.e("WriteToFile", e.toString());
                    e.printStackTrace();
                }
            }
        });
        thread.start();
    }

    List<File> mGFile;

    public void onListGoogle(View v) {
        AsyncTask<Void, Void, String> task = new AsyncTask<Void, Void, String>() {

            @Override
            protected String doInBackground(Void... arg0) {
                // TODO Auto-generated method stub
                try {
                    mGFile = retrieveAllFiles();
                    int i = 0;
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                return null;
            }

            protected void onPostExecute(String result) {
                Log.d("Dolphin get glist", String.valueOf(mGFile.size()));
            };
        };
        task.execute();
        Log.d("Dolphin counting", "aa");
    }

    private List<File> retrieveAllFiles() throws IOException {
        List<File> result = new ArrayList<File>();
        Files.List request = service.files().list();

        do {
            try {
                FileList files = request.execute();

                result.addAll(files.getItems());
                request.setPageToken(files.getNextPageToken());
            } catch (IOException e) {
                System.out.println("An error occurred: " + e);
                request.setPageToken(null);
            }
        } while (request.getPageToken() != null && request.getPageToken().length() > 0);

        return result;
    }

    private Drive getDriveService(GoogleAccountCredential credential) {
        return new Drive.Builder(AndroidHttp.newCompatibleTransport(), new GsonFactory(), credential).build();
    }

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        switch (requestCode) {
        case REQUEST_ACCOUNT_PICKER:
            if (resultCode == RESULT_OK && data != null && data.getExtras() != null) {
                String accountName = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
                if (accountName != null) {
                    credential.setSelectedAccountName(accountName);
                    service = getDriveService(credential);
                }
            }
            break;
        case REQUEST_AUTHORIZATION:
            if (resultCode == Activity.RESULT_OK) {
                // saveFileToDrive();
                Toast.makeText(this, "Login complete", Toast.LENGTH_SHORT);
            } else {
                startActivityForResult(credential.newChooseAccountIntent(), REQUEST_ACCOUNT_PICKER);
            }
            break;
        }
    }