等待HTTP请求内的Firebase存储调用以继续

Posted 2023-01-26

我有点困在这里。我已将一些具有唯一ID的图像上传到我的Firebase存储中，这些ID已通过HTTP（带有标题等）发送到了外部服务器。现在，我想在手机屏幕上看到这些图像，因此我必须使用HTTP来检索uid的ID，然后搜索存储中的每个图像：

package com.app.chotuve.home

import android.util.Log
import com.app.chotuve.context.ApplicationContext
import com.github.kittinunf.fuel.Fuel
import com.github.kittinunf.fuel.core.extensions.jsonBody
import com.github.kittinunf.fuel.json.responseJson
import com.github.kittinunf.result.Result
import com.google.firebase.storage.FirebaseStorage
import org.json.JSONArray


class VideoDataSource 

    companion object 
        private val TAG: String = "Video Data Source"
        private const val serverURL: String = "https://localhost:8081/videos"
        fun createDataSet(): ArrayList<ModelVideo> 
            val storage = FirebaseStorage.getInstance().reference
            val list = ArrayList<ModelVideo>()
            Fuel.get(serverURL)
                .jsonBody(" \"user\" : \"$ApplicationContext.getConnectedUsername()\"," +
                        " \"token\" : \"$ApplicationContext.getConnectedUsername()\"" +
                        "") #Ignore this, it is to check if the connected user is valid.
                .responseJson  request, response, result ->
                    when (result) 
                        is Result.Success -> 
                            val body = response.body()
                            val jsonList = JSONArray(body.asString("application/json"))
                            for (i in 0 until jsonList.length()) 
                                val item = jsonList.getJSONObject(i)
                                val date = item["date"] as String
                                val title = item["title"] as String
                                val user = item["user"] as String
                                val thumbURL: String = item["thumbnail"] as String

                                storage.child("thumbnails/").child(thumbURL).downloadUrl
                                    .addOnSuccessListener 
                                        var url = it.toString()
                                        list.add(
                                            ModelVideo(
                                                title,
                                                user,
                                                url,
                                                date
                                            )
                                        )
                                        Log.d(TAG, "Success $url.")
                                    .addOnFailureListener 
                                        Log.d(TAG, "Error obtaining Video: $it.message.")
                                    
                            
                        
                        is Result.Failure -> 
                            //Look up code and choose what to do.
                            Log.d(TAG, "Error obtaining Videos.")
                        
                    
                
            return list
        
    

由于Firebase和Fuel都是异步的，所以数据列表总是返回空，我似乎找不到等待完整响应的方法。

免责声明：HTTP是必需的。我无法将这种逻辑转移到Firebase数据库（如我所愿）。

答案

也许您可以像这样使用阻塞的HTTP请求？

...
val list = ArrayList<ModelVideo>()
val (request, response, result) = serverURL.httpGet()
    .jsonBody(
        " \"user\" : \"$ApplicationContext.getConnectedUsername()\"," +
                " \"token\" : \"$ApplicationContext.getConnectedUsername()\"" +
                ""
    )
    .responseJson()
when (result) 
...