如何从Firebase Storage获取下载URL? [英] How to get the download url from Firebase Storage?

问题描述

我想从Firebase的uploadTask.addOnProgressListener方法获取下载地址.如何使用以下代码获取下载网址?

I want to get the Download Url from uploadTask.addOnProgressListener method of Firebase. How can I get the Download Url using following code?

    UploadTask uploadTask = storageRef.putBytes(data);

    uploadTask.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>()
    {
        @Override
        public void onProgress(UploadTask.TaskSnapshot taskSnapshot)
        {
            Log.d("aaaaasessin",""+taskSnapshot.getTask().getResult());
        }
    });

我使用了taskSnapshot.getTask().getResult()，但是没有用.

I used taskSnapshot.getTask().getResult() but that is not working.

推荐答案

编辑2019年8月22日:

Android SDK中最近在StorageReference的类中添加了一种名为

There is a new method recently added to StorageReference's class in the Android SDK named list().

要解决此问题，您需要遍历ListResult并调用getDownloadUrl()以获取每个文件的下载URL.请记住，getDownloadUrl()方法是异步的，因此它返回一个Task对象.请参阅下面的详细信息.

To solve this, you need to loop over the ListResult and call getDownloadUrl() to get the download URLs of each file. Rememeber that getDownloadUrl() method is asynchronous, so it returns a Task object. See below details.

要获取下载网址，您需要使用addOnSuccessListener，如以下代码行所示:

In order to get the download url, you need to use addOnSuccessListener, like in the following lines of code:

uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
    @Override
    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
        storageRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
            @Override
            public void onSuccess(Uri uri) {
                String url = uri.toString();

                //Do what you need to do with url
            }
        });
    }
});

在2018年5月23日的 Firebase发行说明中提到

As in the Firebase release notes on May 23, 2018 is mentioned that:

云存储版本16.0.1

Cloud Storage version 16.0.1

删除了不推荐使用的StorageMetadata.getDownloadUrl()和UploadTask.TaskSnapshot.getDownloadUrl()方法.要获取当前的下载URL，请使用StorageReference.getDownloadUr().

Removed the deprecated StorageMetadata.getDownloadUrl() and UploadTask.TaskSnapshot.getDownloadUrl() methods. To get a current download URL, use StorageReference.getDownloadUr().

现在，当调用在 StorageReference 对象，它将返回Task对象，而不再不再一个Uri对象.

So now when calling getDownloadUrl() on a StorageReference object it returns a Task object and not an Uri object anymore.

也请记住，如果您的设备无法访问Firebase Storage后端，则不会调用成功侦听器或失败侦听器(如果您打算使用它).仅在数据提交到Firebase服务器或被Firebase服务器拒绝后，才会调用成功/失败侦听器.

Please also rememeber, neither the success listener nor the failure listener (if you intend to use it), will be called if your device cannot reach Firebase Storage backend. The success/failure listeners will only be called once the data is committed to, or rejected by the Firebase servers.

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