gistfile1.java

public void connectFit() {
        if (TextUtils.isEmpty(mGoogleMail)) {
            Intent intent = AccountPicker.newChooseAccountIntent(null, null, new String[]{"com.google"},
                    false, null, null, null, null);
            startActivityForResult(intent, GOOGLE_ACCOUNT_PICKER_REQUEST);
            return;
        }

        new AsyncTask<Void, Void, String>() {
            @Override
            protected String doInBackground(Void... params) {
                try {
                    return GoogleAuthUtil.getToken(Help.appCtx(), mGoogleMail,
                            "oauth2:https://www.googleapis.com/auth/fitness");
                } catch (IOException transientEx) {
                    // network or server error, the call is expected to succeed if you try again later.
                    // Don't attempt to call again immediately - the request is likely to
                    // fail, you'll hit quotas or back-off.
                    transientEx.printStackTrace();
                    return null;
                } catch (UserRecoverableAuthException e) {
                    // Requesting an authorization code will always throw
                    // UserRecoverableAuthException on the first call to GoogleAuthUtil.getToken
                    // because the user must consent to offline access to their data.  After
                    // consent is granted control is returned to your activity in onActivityResult
                    // and the second call to GoogleAuthUtil.getToken will succeed.
                    startActivityForResult(e.getIntent(), GOOGLE_TOKEN_REQUEST);
                    return null;
                } catch (GoogleAuthException authEx) {
                    // Failure. The call is not expected to ever succeed so it should not be
                    // retried.
                    authEx.printStackTrace();
                    return null;
                }
            }

            @Override
            protected void onPostExecute(String token) {
                if (TextUtils.isEmpty(token)) {
                    //TODO Handle Error properly
                    return;
                }
                SharedPrefUtils.DEFAULT.save(GOOGLE_FIT_TOKEN, token);
                linkToGoogleFit(token);
            }
        }.execute();
    }