我正在努力获取Firebase存储桶中文件的“长期持久下载链接”。我已将此权限更改为
service firebase.storage {
match /b/project-xxx.appspot.com/o {
match /{allPaths=**} {
allow read, write;
}
}
}
我的javacode看起来像这样：
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;
}
当我运行这个时，我得到的uri链接看起来像com.google.android.gms.tasks.zzh@xxx
问题1.我可以从此获得类似的下载链接：https://firebasestorage.googleapis.com/v0/b/project-xxxx.appspot.com/o/20-5-2016.csv?alt=media&token=b5d45a7f-3ab7-4f9b-b661-3a2187adxxxx
当我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;
}
但是当这样做时我得到403错误，并且应用程序崩溃了。控制台告诉我这是bc用户未登录/ auth。 “在请求令牌之前请先登录”
问题2.我该如何解决这个问题？
请参考documentation for getting a download URL。
当你调用getDownloadUrl()时，调用是异步的，你必须订阅成功回调才能获得结果：
// 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
}
});
}
这将返回一个公共的不可思议的下载URL。如果你刚上传了一个文件，那么这个公共网址将在上传的成功回调中（你上传后不需要调用另一个异步方法）。
但是，如果你想要的只是参考的String表示，你可以调用.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();
}
// Firebase easy和工作上传和下载。
@覆盖
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);
}
});
}
});
}
StorageReference mStorageRef = FirebaseStorage.getInstance().getReference();
final StorageReference fileupload=mStorageRef.child("Photos").child(fileUri.getLastPathSegment());
UploadTask uploadTask = fileupload.putFile(fileUri);
Task<Uri> urlTask = uploadTask.continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
@Override
public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
if (!task.isSuccessful()) {
throw task.getException();
}
return ref.getDownloadUrl();
}
}).addOnCompleteListener(new OnCompleteListener<Uri>() {
@Override
public void onComplete(@NonNull Task<Uri> task) {
if (task.isSuccessful()) {
Uri downloadUri = task.getResult();
Picasso.get().load(downloadUri.toString()).into(image);
} else {
// Handle failures
}
}
});
在这里我上传并同时获取图像网址...
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();
}
});
}
Clean And Simple
private void putImageInStorage(StorageReference storageReference, Uri uri, final String key) {
storageReference.putFile(uri).addOnCompleteListener(MainActivity.this,
new OnCompleteListener<UploadTask.TaskSnapshot>() {
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if (task.isSuccessful()) {
task.getResult().getMetadata().getReference().getDownloadUrl()
.addOnCompleteListener(MainActivity.this,
new OnCompleteListener<Uri>() {
@Override
public void onComplete(@NonNull Task<Uri> task) {
if (task.isSuccessful()) {
FriendlyMessage friendlyMessage =
new FriendlyMessage(null, mUsername, mPhotoUrl,
task.getResult().toString());
mFirebaseDatabaseReference.child(MESSAGES_CHILD).child(key)
.setValue(friendlyMessage);
}
}
});
} else {
Log.w(TAG, "Image upload task was not successful.",
task.getException());
}
}
});
}
在大于11.0.5的firebase版本中删除了getDownloadUrl方法。我建议使用仍然使用此方法的版本11.0.2。
对我来说，我在Kotlin中完成了我的代码，我遇到了同样的错误“getDownload（）”。以下是对我有用的依赖项和Kotlin代码。
implementation 'com.google.firebase:firebase-storage:18.1.0' firebase存储依赖项
这是我添加的，它在Kotlin中为我工作。 Storage（）将在Download（）之前出现
profileImageUri = taskSnapshot.storage.downloadUrl.toString()
getDownloadUrl方法现已在新的firebase更新中折旧。而是使用以下方法。 taskSnapshot.getMetadata（）。getReference（）。getDownloadUrl（）。的toString（）