将多个图像从 Firebase 实时数据库下载到设备存储

Question

我有一个 recyclerview，它显示来自 Firebase 实时数据库的多个图像。 recyclerview 里面也有一个按钮。我希望此按钮允许用户在点击后一次一张下载这些图片。

一旦用户单击“下载”，我希望将图像保存到他们的设备存储中。我为此尝试了多种解决方案，但它们对 Firestore 数据库都没有帮助，或者只允许下载一个图像。

代码

class AbstractAdapter(private val mContext: Context, private val abstractList: List<Abstract>) :
RecyclerView.Adapter<AbstractAdapter.ViewHolder>() {

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    val view = LayoutInflater.from(parent.context).inflate(R.layout.abstract_image_view, parent, false)
    return ViewHolder(view)
}

override fun onBindViewHolder(holder: ViewHolder, position: Int) {


    holder.download_btn.setOnClickListener {
        downloadFile()


    }

    Glide.with(mContext)
        .load(abstractList[position].abstract)
        .into(holder.imageView)
}

override fun getItemCount(): Int {
    return abstractList.size
}

class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
    val imageView: ImageView = itemView.findViewById(R.id.abstractImageView)
    val download_btn: Button = itemView.findViewById(R.id.abstractDownloadBtn)

}

private fun downloadFile() {
    val storage = FirebaseStorage.getInstance()
    val storageRef = storage.getReferenceFromUrl("https://notes-72413.firebaseio.com/")
    val islandRef = storageRef.child("Abstract")
    val rootPath = File(Environment.getExternalStorageDirectory(), "abstract")
    if (!rootPath.exists()) {
        rootPath.mkdirs()
    }
    val localFile = File(rootPath, "imageName.jpeg")
    islandRef.getFile(localFile)
        .addOnSuccessListener(OnSuccessListener<FileDownloadTask.TaskSnapshot?> {
            Log.e("firebase ", ";local tem file created  created $localFile")
            //  updateDb(timestamp,localFile.toString(),position);
        }).addOnFailureListener(OnFailureListener { exception ->
            Log.e(
                "firebase ",
                ";local tem file not created  created $exception"
            )
        })
}


companion object {
    private const val Tag = "RecyclerView"
}

我试过这段代码，但是一旦我点击“下载”按钮，它立即崩溃，Logcat 说Firebase Storage URLs must point to an object in your Storage Bucket. Please obtain a URL using the Firebase Console or getDownloadUrl()

我的 Firebase 实时数据库

共有 64 个文件

总结

我有一个显示来自 Firebase 实时数据库的图像的回收视图。一旦用户点击“下载”按钮，它一次只会将一张图片下载到他们的设备存储中。

更新

private fun downloadFile() {
    val storage = FirebaseStorage.getInstance()
    val storageRef = storage.getReferenceFromUrl("abstract")

    val rootPath = File(Environment.getExternalStorageDirectory(), "abstract")
    if (!rootPath.exists()) {
        rootPath.mkdirs()
    }

    val localFile = File(rootPath, "imageName.jpeg")
    storageRef.child("Abstract").downloadUrl.addOnSuccessListener { Log.e("firebase ", ";local tem file created  created $localFile")

    }.addOnFailureListener(OnFailureListener { exception ->
            Log.e("firebase ", ";local tem file not created  created $exception")
        })
}

这些是我对 downloadFile 函数所做的更改，但我仍然收到错误：

The storage Uri could not be parsed

Answer 1

As you are downloading based on your storage URLs so need to use getDownloadUrl() method.
storageRef.child("Abstract").getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
    @Override
    public void onSuccess(Uri uri) {
      ...Uri
    }
}).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        // To handle error
    }
});