如何将firebase in-app-messaging-display api的源代码导入到我的android项目中？

buildscript {
    repositories {
        google()
        // 其他仓库
    }
    dependencies {
        // 添加Google服务插件依赖
        classpath 'com.google.gms:google-services:4.3.8'
    }
}

// 其他配置和插件

dependencies {
    // 添加Firebase In-App Messaging库依赖
    implementation 'com.google.firebase:firebase-inappmessaging-display:20.4.0'
}

// 应用Google服务插件
apply plugin: 'com.google.gms.google-services'

import com.google.firebase.inappmessaging.display.FirebaseInAppMessagingDisplay;
import com.google.firebase.inappmessaging.display.FirebaseInAppMessagingDisplayCallbacks;
import com.google.firebase.inappmessaging.display.FirebaseInAppMessagingDisplayErrorReason;
import com.google.firebase.inappmessaging.display.FirebaseInAppMessagingDisplayImpl;

public class CustomInAppMessagingDisplay implements FirebaseInAppMessagingDisplay {
    // 实现自定义样式和行为的相关方法
}

import com.google.firebase.FirebaseApp;
import com.google.firebase.inappmessaging.FirebaseInAppMessaging;

public class MyApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        FirebaseApp.initializeApp(this);
        FirebaseInAppMessaging.getInstance().setDisplay(new CustomInAppMessagingDisplay());
    }
}