如果未安装应用程序，则Facebook登录无法启动第二个活动

Question

I'm trying to implement the Facebook Login on an Android app. I followed the Facebook Developer guide and it's working but if Facebook app is not installed then it takes login details,logs in and stays on same activity and just show logout button, if I close application and start again then it works perfectly fine.

public class MainActivity extends AppCompatActivity {

    LoginButton loginButton;
    CallbackManager callbackManager;


    @Override
    protected void onCreate(Bundle savedInstanceState) {

        FacebookSdk.sdkInitialize(getApplicationContext());
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        isLoggedIn();

        loginButton = (LoginButton) findViewById(R.id.login_button);

        callbackManager = CallbackManager.Factory.create();

        LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                AccessToken   accessToken = loginResult.getAccessToken();
                Profile profile = Profile.getCurrentProfile();
                nextActivity(profile);

            }

            @Override
            public void onCancel() {

            }

            @Override
            public void onError(FacebookException error) {

            }
        });

        loginButton.setReadPermissions("user_friends");



    }

    protected void onActivityResult(int requestCode, int responseCode, Intent intent) {
        super.onActivityResult(requestCode, responseCode, intent);
        //Facebook login
        callbackManager.onActivityResult(requestCode, responseCode, intent);

    }

    public void isLoggedIn() {

        AccessToken accessToken = AccessToken.getCurrentAccessToken();
        if (accessToken!=null) {

            Profile profile=Profile.getCurrentProfile();

            nextActivity(profile);
        }
    }

    private void nextActivity(Profile profile) {
        if (profile != null) {                                                                                        Intent main = new Intent(MainActivity.this, Result.class);
            main.putExtra("Name", profile.getFirstName());
            main.putExtra("Surname", profile.getLastName());
            startActivity(main);
            finish();
        }
    }
}

Answer 1

Instead of using LoginManager.getInstance().registerCallback() use loginButton.registerCallback()

EDIT:

Inside onSuccess have following code:

    @Override
    public void onSuccess(LoginResult loginResult) {
        AccessToken accessToken = loginResult.getAccessToken();
        if(Profile.getCurrentProfile() == null) {
                ProfileTracker profileTracker = new ProfileTracker() {
                        @Override
                        protected void onCurrentProfileChanged(Profile oldProfile, Profile currentProfile) {
                               this.stopTracking();
                               nextActivity(currentProfile);
                        }
                };
                profileTracker.startTracking();
        }else{
               Profile profile = Profile.getCurrentProfile();
               nextActivity(profile);
        }