Facebook Login in android

build.gradle

dependencies{
  ....
  compile 'com.facebook.android:facebook-android-sdk:4.+'
  ....
}

FacebookLogin.java

 
    private CallbackManager callbackManager;
    private LoginManager loginManager;
    
    private ProgressDialog mProgressDialog; 
 
    public FragmentLogin() {
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_login_container, null);
        return view;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getActivity());
        setUpFacebook();
         

    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        ButterKnife.bind(this, view);
        signup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
               //your code
            }
        });

    }

    @Override
    public void onStart() {
        super.onStart();

    } 

    @OnClick(R.id.fb_login)
    void connectToFacebook() {

        if (AccessToken.getCurrentAccessToken() == null)
            loginManager.logInWithReadPermissions(FragmentLogin.this, Arrays.asList("public_profile", "email", "user_birthday"));
        else {
            getFbDetails(AccessToken.getCurrentAccessToken());
        }

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

        if (requestCode == RC_SIGN_IN && resultCode == Activity.RESULT_OK) {
            try {
                GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
                handleSignInResult(result);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }  
        Log.e("succes", "in fragment");
    }


    private void setUpFacebook() {
        callbackManager = CallbackManager.Factory.create();
        loginManager = LoginManager.getInstance();
        loginManager.registerCallback(callbackManager,
                new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(LoginResult loginResult) {
                        Log.e("email is", "successs");
                        final AccessToken accessToken = loginResult.getAccessToken();
                        getFbDetails(accessToken);
                    }

                    @Override
                    public void onCancel() {
                        // App code
                    }

                    @Override
                    public void onError(FacebookException exception) {
                        Toast.makeText(getActivity(), "error", Toast.LENGTH_LONG).show();
                        // App code
                    }
                });

    }

    private void getFbDetails(AccessToken accessToken) {
        Myutils.Showprogressbar(getActivity());
        GraphRequest request = GraphRequest.newMeRequest(accessToken, new GraphRequest.GraphJSONObjectCallback() {
            @Override
            public void onCompleted(JSONObject user, GraphResponse graphResponse) {

                JSONObject jsonObject = graphResponse.getJSONObject();
                try {
                    String profilePicUrl = jsonObject.getJSONObject("picture").getJSONObject("data").getString("url");
                    String email = user.optString("email");
                    String name = user.optString("name");
                    String id = user.optString("id");
                    Log.e("email is", "" + user.optString("email"));
                    Log.e("link is", "" + user.optString("link"));
                    Log.d("response is", "" + user);
                    socialLogin(email, id, profilePicUrl, "facebook", name);
                } catch (JSONException e) {
                    e.printStackTrace();
                }

                // Toast.makeText(getActivity(), "link:" + (user.optString("picture")), Toast.LENGTH_LONG).show();
                // Toast.makeText(getActivity(), "link:" + (user), Toast.LENGTH_LONG).show();
            }
        });

        Bundle bundle = new Bundle();
        bundle.putString("fields", "id,email,name,birthday,link,picture.type(large)");
        request.setParameters(bundle);
        request.executeAsync();
    }
 

    @Override
    public void onStop() {
        super.onStop();
        if (mProgressDialog != null) {
            mProgressDialog.dismiss();
        }
    }

    private void showProgressDialog() {
        if (mProgressDialog == null) {
            mProgressDialog = new ProgressDialog(getActivity());
            mProgressDialog.setMessage(getString(R.string.loading));
            mProgressDialog.setIndeterminate(true);
        }

        mProgressDialog.show();
    }

    private void hideProgressDialog() {
        if (mProgressDialog != null && mProgressDialog.isShowing()) {
            mProgressDialog.hide();
        }
    }