如何在android的登录屏幕上使用Facebook开发工具包进行会话？

implementation 'com.facebook.android:facebook-android-sdk:5.15.3'

<uses-permission android:name="android.permission.INTERNET" />

<application>
    <meta-data
        android:name="com.facebook.sdk.ApplicationId"
        android:value="@string/facebook_app_id" />

    <activity
        android:name="com.facebook.FacebookActivity"
        android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:label="@string/app_name" />

    <activity
        android:name="com.facebook.CustomTabActivity"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />

            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />

            <data android:scheme="@string/fb_login_protocol_scheme" />
        </intent-filter>
    </activity>
</application>

<com.facebook.login.widget.LoginButton
    android:id="@+id/facebook_login_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:layout_marginTop="16dp"
    android:layout_marginBottom="16dp" />

import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;

public class LoginActivity extends AppCompatActivity {

    private CallbackManager callbackManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        callbackManager = CallbackManager.Factory.create();

        LoginButton loginButton = findViewById(R.id.facebook_login_button);
        loginButton.setPermissions("email", "public_profile");
        loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                // 处理登录成功的逻辑
            }

            @Override
            public void onCancel() {
                // 处理用户取消登录的逻辑
            }

            @Override
            public void onError(FacebookException error) {
                // 处理登录错误的逻辑
            }
        });
    }

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