我试图创建登录选项使用FirebaseUi得到这个错误
无法解析符号"AuthUI"，无法解析符号"FirebaseAuth"
这是密码：

public class SplashScreenActivity extends AppCompatActivity {

    private final static int LOGIN_REQUEST_CODE = 7898;
    private List<AuthUI.IdpConfig> providers;
    private FirebaseAuth firebaseAuth;
    private FirebaseAuth.Authstatetistener listener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        delaySplashScreen();
        init();
    }
private void init(){
        providers = Arrays.asList(
                new AuthUi.IdpConfig.PhoneBuilder().build(),
                new AuthUi.IdpConfig.GoogleBuilder().build());

}

    @SuppressLint("CheckResult")
    private void  delaySplashScreen(){
        Completable.timer(5, TimeUnit.SECONDS, AndroidSchedulers.mainThread()).subscribe(() -> Toast.makeText(SplashScreenActivity.this, "Splash Screen Done", Toast.LENGTH_SHORT).show());

        
    }
}

我正在使用此依赖项

dependencies {

    implementation 'androidx.appcompat:appcompat:1.6.1'
    implementation 'com.google.android.material:material:1.8.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    implementation 'com.google.firebase:firebase-auth:21.1.0'
    implementation 'com.google.android.gms:play-services-gcm:17.0.0'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'

    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
    implementation 'io.reactivex.rxjava2:rxjava:2.2.6'

    implementation 'com.firebaseui:firebase-ui-auth:8.0.2'

}

帮助我解决这个问题，为什么AuthUi是不是在这里工作，以及FirebaseAuth。请给我一些建议，如何解决这个问题。