如何从Firebase存储getDownloadURL获取URL
如何从Firebase存储getDownloadURL获取URL
提问于 2016-05-22 13:16:08
我正在尝试获取“长期持久下载链接”到我们的Firebase存储桶中的文件。我已经把这个权限改为
service firebase.storage {
match /b/project-xxx.appspot.com/o {
match /{allPaths=**} {
allow read, write;
}
}
}我的javacode如下所示：
private String niceLink (String date){
String link;
// Points to the root reference
StorageReference storageRef = FirebaseStorage.getInstance().getReference();
StorageReference dateRef = storageRef.child("/" + date+ ".csv");
link = dateRef.getDownloadUrl().toString();
return link;
}当我运行这个程序时，我会得到一个uri链接，它看起来类似于com.google.android.gms.tasks.zzh@xxx
问题1.可以从这里获得类似于：https://firebasestorage.googleapis.com/v0/b/project-xxxx.appspot.com/o/20-5-2016.csv?alt=media&token=b5d45a7f-3ab7-4f9b-b661-3a2187adxxxx的下载链接吗？
在尝试获取上面的链接时，我在返回之前更改了最后一行，如下所示：
private String niceLink (String date){
String link;
// Points to the root reference
StorageReference storageRef = FirebaseStorage.getInstance().getReference();
StorageReference dateRef = storageRef.child("/" + date+ ".csv");
link = dateRef.getDownloadUrl().getResult().toString();
return link;
}但是当我这样做的时候，我得到了一个403错误，并且应用程序崩溃了。consol告诉我这是bc用户没有登录到/auth中。“请先签到，再索要代币”
问题2.如何解决这个问题？
回答 13
Stack Overflow用户
回答已采纳
发布于 2016-05-22 20:21:24
请参阅获取下载URL的文档。
调用getDownloadUrl()时，调用是异步的，必须订阅成功的回调才能获得结果：
// Calls the server to securely obtain an unguessable download Url
private void getUrlAsync (String date){
// Points to the root reference
StorageReference storageRef = FirebaseStorage.getInstance().getReference();
StorageReference dateRef = storageRef.child("/" + date+ ".csv");
dateRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>()
{
@Override
public void onSuccess(Uri downloadUrl)
{
//do something with downloadurl
}
});
}这将返回一个公众无法猜测的下载网址。如果您刚刚上传了一个文件，这个公共url将位于上传的成功回调中(上传后不需要调用另一个异步方法)。
但是，如果您只需要引用的String表示，则只需调用.toString()
// Returns a Uri of the form gs://bucket/path that can be used
// in future calls to getReferenceFromUrl to perform additional
// actions
private String niceRefLink (String date){
// Points to the root reference
StorageReference storageRef = FirebaseStorage.getInstance().getReference();
StorageReference dateRef = storageRef.child("/" + date+ ".csv");
return dateRef.toString();
}Stack Overflow用户
发布于 2018-11-08 00:12:45
//Firebase存储-易于上载和下载。
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable final Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == RC_SIGN_IN){
if(resultCode == RESULT_OK){
Toast.makeText(this,"Signed in!", LENGTH_SHORT).show();
} else if(resultCode == RESULT_CANCELED){
Toast.makeText(this,"Signed in canceled!", LENGTH_SHORT).show();
finish();
}
} else if(requestCode == RC_PHOTO_PICKER && resultCode == RESULT_OK){
// HERE I CALLED THAT METHOD
uploadPhotoInFirebase(data);
}
}
private void uploadPhotoInFirebase(@Nullable Intent data) {
Uri selectedImageUri = data.getData();
// Get a reference to store file at chat_photos/<FILENAME>
final StorageReference photoRef = mChatPhotoStorageReference
.child(selectedImageUri
.getLastPathSegment());
// Upload file to Firebase Storage
photoRef.putFile(selectedImageUri)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
// Download file From Firebase Storage
photoRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri downloadPhotoUrl) {
//Now play with downloadPhotoUrl
//Store data into Firebase Realtime Database
FriendlyMessage friendlyMessage = new FriendlyMessage
(null, mUsername, downloadPhotoUrl.toString());
mDatabaseReference.push().setValue(friendlyMessage);
}
});
}
});
}Stack Overflow用户
发布于 2019-02-14 18:12:38
在这里，我同时上传和获取图像url .
final StorageReference profileImageRef = FirebaseStorage.getInstance().getReference("profilepics/" + System.currentTimeMillis() + ".jpg");
if (uriProfileImage != null) {
profileImageRef.putFile(uriProfileImage)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
// profileImageUrl taskSnapshot.getDownloadUrl().toString(); //this is depreciated
//this is the new way to do it
profileImageRef.getDownloadUrl().addOnCompleteListener(new OnCompleteListener<Uri>() {
@Override
public void onComplete(@NonNull Task<Uri> task) {
String profileImageUrl=task.getResult().toString();
Log.i("URL",profileImageUrl);
}
});
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
progressBar.setVisibility(View.GONE);
Toast.makeText(ProfileActivity.this, "aaa "+e.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/37374868
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