Clever Geek Handbook

Android Facebook Login: how to validate login with LoginManager without login in XML format

I have done facebook login validation in my android app using LoginButton, but I want to validate using LoginManager. How can I change my code to work this way?

   LoginButton loginButton = (LoginButton) findViewById(R.id.fb_login_button);
    loginButton.setReadPermissions("user_friends");

    shareDialog = new ShareDialog(this);

    //Login Callback registration
    LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            Toast.makeText(getApplicationContext(), "in LoginResult on success", Toast.LENGTH_LONG).show();

            //Login success - process to Post
            if (ShareDialog.canShow(ShareLinkContent.class)) {
                String description = "description";
                ShareLinkContent linkContent = new ShareLinkContent.Builder()
                        .setContentTitle("title")
                        .setContentDescription(description)
                        .setContentUrl(Uri.parse("http://google.com"))
                        .setImageUrl(Uri.parse("http://google.com"))
                        .build();

                shareDialog.show(linkContent, ShareDialog.Mode.FEED);
            }

        }

        @Override
        public void onCancel() {
            Toast.makeText(getApplicationContext(), "in LoginResult on cancel", Toast.LENGTH_LONG).show();
        }

        @Override
        public void onError(FacebookException exception) {
            Toast.makeText(getApplicationContext(), "in LoginResult on error", Toast.LENGTH_LONG).show();
        }
    });

Also I want to open the Facebook login dialog if the user is not logged in before opening the Share dialog. The Login dialog must match the Shared dialog (pop-up). How to do it?

Thank!

+3


source to share


3 answers


You can check if the user is logged in by calling the method Loginmanger

. logInWithReadPermissions to manually start the login process, without a button, you can do it in the method onCreate

. If the user is logged in, it immediately invokes the callback method onSuccess

where you can call yours shareDialog

. If the user is not registered, it will display the login screen. And if it was successful (for example, the user logged in), the method will be called onSuccess

;

Actually, you can remove all login button

mentions from your code and add one line at the end:

LoginManager.getInstance().logInWithReadPermissions(this, "user_friends"); //Log in to FB


You can also use WritePermissions. You can read about the required permissions here .

Here's your code, but completed as a login method, without any instances of the login button. You can call him anywhere when you need to check if the user is registered.

public void checkLogin() {
    //Login Callback registration
    LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            Toast.makeText(getApplicationContext(), "in LoginResult on success", Toast.LENGTH_LONG).show();

            //Login success - process to Post
            if (ShareDialog.canShow(ShareLinkContent.class)) {
                String description = "description";
                ShareLinkContent linkContent = new ShareLinkContent.Builder()
                        .setContentTitle("title")
                        .setContentDescription(description)
                        .setContentUrl(Uri.parse("http://google.com"))
                        .setImageUrl(Uri.parse("http://google.com"))
                        .build();

                shareDialog.show(linkContent, ShareDialog.Mode.FEED);
            }

        }

        @Override
        public void onCancel() {
            Toast.makeText(getApplicationContext(), "in LoginResult on cancel", Toast.LENGTH_LONG).show();
        }

        @Override
        public void onError(FacebookException exception) {
            Toast.makeText(getApplicationContext(), "in LoginResult on error", Toast.LENGTH_LONG).show();
        }
    });

    LoginManager.getInstance().logInWithReadPermissions(this, "user_friends"); //Log in to FB
}
+3


source


You can get user profile for this, try,

    Profile dd = Profile.getCurrentProfile().getCurrentProfile();
    if(dd != null)
    {
        //user has logged
    }
    else
    {
        //not logged
    }

You can re-initiate login without LoginButton as follows,



LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList(<required permissions>));

Also you need to implement a callback for the above request

+1


source


You can use ProfileTracker in the same way as to track changes in the current profile:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    FacebookSdk.sdkInitialize(this.getApplicationContext());
    callbackManager = CallbackManager.Factory.create();

    profileTracker = new ProfileTracker() {
        @Override
        protected void onCurrentProfileChanged(
                Profile oldProfile,
                Profile currentProfile) {
            // here if session exist
        }
    };
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    callbackManager.onActivityResult(requestCode, resultCode, data);
}

@Override
public void onDestroy() {
    super.onDestroy();
    profileTracker.stopTracking();
}

Source from here: https://developers.facebook.com/docs/facebook-login/android/v2.3#get_current

0


source






More articles:


All Articles