FIrebase facebook login button (custom button)

gistfile1.txt

        Button btnFacebook = findViewById(R.id.btn_facebook);
        Drawable leftDrawable = AppCompatResources.getDrawable(this, R.drawable.baseline_power_settings_new_black_18dp);
        btnFacebook.setCompoundDrawablesWithIntrinsicBounds(leftDrawable, null, null, null);

        // Start Facebook integration
        LoginManager fbLoginManager = com.facebook.login.LoginManager.getInstance();
        mCallbackManager = CallbackManager.Factory.create();
        fbLoginManager.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Log.d(TAG, "facebook:onSuccess:" + loginResult);
                handleFacebookAccessToken(loginResult.getAccessToken());
            }

            @Override
            public void onCancel() {
                Log.d(TAG, "facebook:onCancel");
                // ...
            }

            @Override
            public void onError(FacebookException error) {
                Log.d(TAG, "facebook:onError", error);
                // ...
            }
        });

        btnFacebook.setOnClickListener(v -> fbLoginManager.logInWithReadPermissions(
                this,
                Arrays.asList("email", "public_profile", "user_birthday")));