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Facebook android

HI Guys I need to implement facebook login for my android application. I also use andengine, so I cannot use the login button provided by facebook. I also need the user's email address.

I created an action for this purpose called facebookActivity.

public class FacebookActivity extends BaseGameActivity{ private static final int CAMERA_WIDTH = 480; private static final int CAMERA_HEIGHT = 720; private Scene scene; private StatusCallback callback; @SuppressLint("NewApi") @Override public EngineOptions onCreateEngineOptions() { int SDK_INT = android.os.Build.VERSION.SDK_INT; if (SDK_INT>8){ StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); } final Camera camera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT); return new EngineOptions(true, ScreenOrientation.PORTRAIT_SENSOR, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), camera); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data); } @Override public void onCreateResources( OnCreateResourcesCallback pOnCreateResourcesCallback) throws Exception { pOnCreateResourcesCallback.onCreateResourcesFinished(); // TODO Auto-generated method stub } @Override public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback) throws Exception { scene = new Scene(); scene.setBackground(new Background(HelperMethods.getColorFromHex("#372108"))); pOnCreateSceneCallback.onCreateSceneFinished(scene); } @Override public void onPopulateScene(Scene pScene, OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception { callback = new Session.StatusCallback() { // callback when session changes state @Override public void call(Session session, SessionState state, Exception exception) { if (session.isOpened()) { // make request to the /me API Request.executeMeRequestAsync(session, new Request.GraphUserCallback() { // callback after Graph API response with user object @Override public void onCompleted(GraphUser user, Response response) { if (user != null) { Log.d("text","Hello " + user.getName() + " " + user.getInnerJSONObject()); } } }); } else{ } } }; final OpenRequest openRequest = new OpenRequest(this); List<String> readPermissions = new ArrayList<String>(); readPermissions.add("email"); openRequest.setPermissions(readPermissions); openRequest.setLoginBehavior(SessionLoginBehavior.SSO_WITH_FALLBACK); openRequest.setCallback(callback); runOnUiThread(new Runnable(){ @Override public void run() { new Session(FacebookActivity.this).openForRead(openRequest); } }); pOnPopulateSceneCallback.onPopulateSceneFinished(); } }

When I run this code, I get a NullPointerException

 java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=64206, result=-1, data=Intent { (has extras) }} to activity {com.vocabtrainer.code/com.vocabtrainer.code.FacebookActivity}: java.lang.NullPointerException

I tried debugging and found that inside onActivityResult Session.getActiveSession () is NULL. but my application is actually posting to facebook and I allow you permission. Am I missing something? Guys please check

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3 answers
  protected void onFacebookLoginClicked() { Session.openActiveSession(SplashActivity.this, true, permissions, new Session.StatusCallback() { @Override public void call(Session session, SessionState state, Exception exception) { if (session.isOpened()) { Request.newMeRequest(session, new Request.GraphUserCallback() { @Override public void onCompleted(GraphUser user, com.facebook.Response response) { if (user != null) { final Session curSession = Session .getActiveSession(); fbUserid = user.getId(); fbEmail = user.asMap() .get("email") .toString(); fbtoken = curSession .getAccessToken(); fbFirstName = user .getFirstName(); fbLastName = user.getLastName(); fbLink = "https://graph.facebook.com/" + fbUserid + "/picture"; enter code here } } }).executeAsync(); } } }); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); Session.getActiveSession().onActivityResult(this, requestCode, resultCode, data); }
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 private Context context; private Fragment mFragment; private ShareDialog mShareDialog; /** * @param context */ public FacebookLoginManager(Context context, Fragment fragment) { this.context = context; this.mFragment = fragment; } /** * @param context */ public FacebookLoginManager(Context context) { this.context = context; } /** * The purpose of this method is to initialize the facebook sdk * * @param callbackManager */ public void initializedFacebook(CallbackManager callbackManager) { if (FacebookSdk.isInitialized()) { performFacebookLogin(callbackManager); } else { FacebookSdk.sdkInitialize(getApplicationContext()); performFacebookLogin(callbackManager); } } /** * The purpose of this method is to initialize the facebook data from the server * * @param callbackManager */ private void performFacebookLogin(CallbackManager callbackManager) { try { LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() { @Override public void onSuccess(LoginResult loginResult) { final String accessToken = "" + loginResult.getAccessToken().getToken(); Log.e("accessToken", accessToken); GraphRequest request = GraphRequest.newMeRequest( AccessToken.getCurrentAccessToken(), new GraphRequest.GraphJSONObjectCallback() { @Override public void onCompleted( JSONObject object, GraphResponse response) { try { final FacebookResponseBean mFacebookResponseBean = new FacebookResponseBean(); if (object != null) { if (object.has(FacebookConstants.ID) && object.get(FacebookConstants.ID) != null) { mFacebookResponseBean.setUserId(object.get(FacebookConstants.ID) + ""); } if (object.has(FacebookConstants.NAME) && object.get(FacebookConstants.NAME) != null) { mFacebookResponseBean.setName(object.get(FacebookConstants.NAME) + ""); } if (object.has(FacebookConstants.EMAIL) && object.get(FacebookConstants.EMAIL) != null) { mFacebookResponseBean.setEmail(object.get(FacebookConstants.EMAIL) + ""); } if (object.has(FacebookConstants.GENDER) && object.get(FacebookConstants.GENDER) != null) { mFacebookResponseBean.setGender(object.get(FacebookConstants.GENDER) + ""); } if (object.has(FacebookConstants.BIRTHDAY) && object.get(FacebookConstants.BIRTHDAY) != null) { mFacebookResponseBean.setBirthday(object.get(FacebookConstants.BIRTHDAY) + ""); } if (object.has(FacebookConstants.AGE_RANGE) && object.get(FacebookConstants.AGE_RANGE) != null) { mFacebookResponseBean.setAgerange(object.get(FacebookConstants.AGE_RANGE) + ""); } if (object.has(FacebookConstants.TIMEZONE) && object.get(FacebookConstants.TIMEZONE) != null) { mFacebookResponseBean.setTimezone(object.get(FacebookConstants.TIMEZONE) + ""); } if (object.has(FacebookConstants.VERIFIED) && object.get(FacebookConstants.VERIFIED) != null) { mFacebookResponseBean.setVerified(object.get(FacebookConstants.VERIFIED) + ""); } if (object.has(FacebookConstants.UPDATED_TIME) && object.get(FacebookConstants.UPDATED_TIME) != null) { mFacebookResponseBean.setUpdatedtime(object.get(FacebookConstants.UPDATED_TIME) + ""); } if (object.has(FacebookConstants.LOCALE) && object.get(FacebookConstants.LOCALE) != null) { mFacebookResponseBean.setLocale(object.get(FacebookConstants.LOCALE) + ""); } if (object.has(FacebookConstants.FIRST_NAME) && object.get(FacebookConstants.FIRST_NAME) != null) { mFacebookResponseBean.setFirstName(object.get(FacebookConstants.FIRST_NAME) + ""); } if (object.has(FacebookConstants.LAST_NAME) && object.get(FacebookConstants.LAST_NAME) != null) { mFacebookResponseBean.setLastName(object.get(FacebookConstants.LAST_NAME) + ""); } if (object.has(FacebookConstants.PICTURE) && object.get(FacebookConstants.PICTURE) != null) { JSONObject picture = object.getJSONObject(FacebookConstants.PICTURE); JSONObject data = picture.getJSONObject("data"); if (data.has("url") && data.get("url") != null) { mFacebookResponseBean.setPhotolink(data.get("url") + ""); Logger.error("image", data.get("url") + ""); } } } if (context instanceof LoginActivity) { ((LoginActivity) context).setFaceBookResponse(mFacebookResponseBean); } else if (context instanceof RegistrationActivity) { ((RegistrationActivity) context).setFaceBookResponse(mFacebookResponseBean); } else if (context instanceof UserProfileActivity) { ((UserProfileActivity) context).setFaceBookResponse(mFacebookResponseBean); } else if (mFragment != null && mFragment instanceof FragmentLinkAccounts) { ((FragmentLinkAccounts) mFragment).setFaceBookResponse(mFacebookResponseBean); } } catch (JSONException e) { e.printStackTrace(); } } }); Bundle parameters = new Bundle(); parameters.putString("fields", FacebookConstants.PERMISSION); request.setParameters(parameters); request.executeAsync(); } @Override public void onCancel() { } @Override public void onError(FacebookException exception) { exception.printStackTrace(); if (exception instanceof FacebookAuthorizationException) { if (AccessToken.getCurrentAccessToken() != null) { LoginManager.getInstance().logOut(); } } } }); } catch (Exception e) { e.printStackTrace(); } } /** * The purpose of this method is to share the image and content on facebook * * @param activity * @param manager * @param image * @param isShareRequest * @param id */ public void shareContent(final Activity activity, CallbackManager manager, View image, final boolean isShareRequest, int id) { mShareDialog = new ShareDialog(activity); String time = GlobalAcess.getDateTime(); mShareDialog.registerCallback(manager, new FacebookCallback<Sharer.Result>() { @Override public void onSuccess(Sharer.Result result) { if (isShareRequest) ToastMessage.getInstance(activity).showLongMessage(activity.getString(R.string.msg_request_posted)); else ToastMessage.getInstance(activity).showLongMessage(activity.getString(R.string.msg_trip_posted)); } @Override public void onCancel() { } @Override public void onError(FacebookException error) { error.printStackTrace(); } }); String url = ""; if (isShareRequest) { url = NetworkConstants.SHARE_REQUEST_URL + "id=" + id + "?t=" + time; } else { url = NetworkConstants.SHARE_TRIP_URL + "id=" + id + "?t=" + time; } if (ShareDialog.canShow(ShareLinkContent.class)) { ShareLinkContent content = new ShareLinkContent.Builder() .setContentUrl(Uri.parse(url)) .build(); mShareDialog.show(content); } }

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You can create a Helper class for facebook login:

 public class FbSignInHelper implements FacebookCallback<LoginResult>, GraphRequest.GraphJSONObjectCallback { private final LoginManager loginManager; private FbSignInCompletionListener fbSignInCompletionListener; private final Fragment fragment; private String accessToken; private PrefManager prefManager = PrefManager.getInstance(); public FbSignInHelper(@NonNull LoginManager loginManager, @NonNull CallbackManager callbackManager, Fragment fragment) { this.loginManager = loginManager; this.fragment = fragment; loginManager.registerCallback(callbackManager, this); } public void loginUsingFb(FbSignInCompletionListener fbSignInCompletionListener) { this.fbSignInCompletionListener = fbSignInCompletionListener; loginManager.logInWithReadPermissions(fragment, Arrays.asList("public_profile", "email")); } @Override public void onSuccess(LoginResult loginResult) { loginResult.getAccessToken(); accessToken = loginResult.getAccessToken().getToken(); if (loginResult.getRecentlyDeniedPermissions().contains("email")) { fbSignInCompletionListener.onFbPermissionDenied(); return; } GraphRequest request = GraphRequest.newMeRequest(loginResult.getAccessToken(), this); Bundle parameters = new Bundle(); parameters.putString("fields", "name,picture,email,first_name,last_name"); request.setParameters(parameters); request.executeAsync(); } @Override public void onCancel() { fbSignInCompletionListener.onFbSignInError(R.string.error_msg_fb_error); } @Override public void onError(FacebookException error) { if (error instanceof FacebookAuthorizationException) { if (AccessToken.getCurrentAccessToken() != null) { LoginManager.getInstance().logOut(); } } fbSignInCompletionListener.onFbSignInError(R.string.error_msg_fb_error); } @Override public void onCompleted(JSONObject object, GraphResponse response) { FacebookRequestError error = response.getError(); if (error != null) { fbSignInCompletionListener.onFbSignInError(R.string.error_msg_fb_error); return; } if (!object.has("email")) { fbSignInCompletionListener.emailEmpty(accessToken, object.optString("id")); final String first_name = object.optString("first_name"); final String last_name = object.optString("last_name"); return; } if (!object.has("email") || !object.has("id")) { fbSignInCompletionListener.onFbSignInError(R.string.error_msg_fb_error); return; } try { final String email = object.getString("email"); final String profilePhoto = object.getJSONObject("picture"). getJSONObject("data").optString("url"); final String name = object.optString("name"); final String first_name = object.optString("first_name"); final String last_name = object.optString("last_name"); final String id = object.optString("id"); prefManager.setUserName(first_name + " " + last_name); FacebookUser facebookUser = new FacebookUser(first_name, last_name, email, profilePhoto, id, accessToken); fbSignInCompletionListener.onFbSignInSuccess(facebookUser); } catch (JSONException e) { Log.e("exception", "unable to parse response from facebook with error message ->%s" + e.getMessage()); //report error to the presenter fbSignInCompletionListener.onFbSignInError(R.string.error_msg_fb_error); } // Log.d("response ->%s", response.getRawResponse()); } }
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