防火墙存储的OnSuccessListener回调不调用

Question

当通过Firebase存储上传文件时，onSuccess方法不会调用。

我目前正在使用'com.google.firebase:firebase-storage:10.2.6'.运行AndroidStudio3.0Canary2

fun uploadImage(pathToImage: String, downloadCallback: FirebaseCallback<String?>) {
        val file = Uri.fromFile(File(pathToImage))
        val ref = mStorRef.child("images/"+file.lastPathSegment)

        ref.putFile(file).addOnSuccessListener {
            object : OnSuccessListener<UploadTask.TaskSnapshot> {
                override fun onSuccess(taskSnapshot: UploadTask.TaskSnapshot?) {
                    val url = taskSnapshot?.downloadUrl
                    Log.d("FirebaseManager", "Upload Successful")
                    downloadCallback.callback(url.toString())
                }
            }
        }
    }

Answer 1

通过使用{}，您可以通过山姆转换作为侦听器传入lambda。在这个lambda中，您定义了在成功时应该发生什么:您正在创建一个从未使用过的object。若要作为侦听器传入object，请使用()

ref.putFile(file).addOnSuccessListener (
    object : OnSuccessListener<UploadTask.TaskSnapshot> {
        override fun onSuccess(taskSnapshot: UploadTask.TaskSnapshot?) {
            val url = taskSnapshot?.downloadUrl
            Log.d("FirebaseManager", "Upload Successful")
            downloadCallback.callback(url.toString())
        }
    }
)

或者只进行SAM转换，而不显式地创建object：

ref.putFile(file).addOnSuccessListener { taskSnapshot ->
    val url = taskSnapshot?.downloadUrl
    Log.d("FirebaseManager", "Upload Successful")
    downloadCallback.callback(url.toString())
}