如何在android中创建facebook SignIn和google SignIn按钮作为浮动操作按钮？

// 导入相关库和依赖
// ...

public class LoginActivity extends AppCompatActivity {
    private CallbackManager callbackManager;
    private GoogleSignInClient googleSignInClient;

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

        // 初始化Facebook SDK
        FacebookSdk.sdkInitialize(getApplicationContext());
        callbackManager = CallbackManager.Factory.create();

        // 初始化Google SignIn API
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail()
                .build();
        googleSignInClient = GoogleSignIn.getClient(this, gso);

        // 创建浮动操作按钮
        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // 调用Facebook登录方法
                LoginManager.getInstance().logInWithReadPermissions(LoginActivity.this, Arrays.asList("public_profile", "email"));
                
                // 调用Google登录方法
                Intent signInIntent = googleSignInClient.getSignInIntent();
                startActivityForResult(signInIntent, RC_SIGN_IN);
            }
        });
    }

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

        // Facebook登录回调
        callbackManager.onActivityResult(requestCode, resultCode, data);

        // Google登录回调
        if (requestCode == RC_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleGoogleSignInResult(task);
        }
    }

    // 处理Google登录结果
    private void handleGoogleSignInResult(Task<GoogleSignInAccount> completedTask) {
        try {
            GoogleSignInAccount account = completedTask.getResult(ApiException.class);
            // 登录成功，处理用户信息
            // ...

        } catch (ApiException e) {
            // 登录失败
            // ...
        }
    }
}