getDownloadUrl函数未返回正确的url
getDownloadUrl函数未返回正确的url
提问于 2018-06-05 01:22:30
我正在上传一个pdf到Firebase存储，并想得到它的下载网址。我使用了以下代码：
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case 1212:
if (resultCode == RESULT_OK) {
String FilePath = data.getDataString();
t.setText(FilePath);
Uri pdfuri = data.getData();
final StorageReference mp = mpdf.child("pdf").child(random()+".pdf");
mp.putFile(pdfuri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if(task.isSuccessful())
{
String download_url = task.getResult().getMetadata().getReference().getDownloadUrl().toString();
String parent = getIntent().getStringExtra("type").toString();
String ch = getIntent().getStringExtra("value").toString();
GeologicDatabase.modifySingle(parent,ch,download_url);
Toast.makeText(modifypdf.this,download_url , Toast.LENGTH_SHORT).show();
finish();
}
else {
Toast.makeText(modifypdf.this,"Faild" , Toast.LENGTH_SHORT).show();
}
}
});
}
break;
}
super.onActivityResult(requestCode, resultCode, data);
}行的结果
String download_url = task.getResult().getMetadata().getReference().getDownloadUrl().toString();"com.google.android.gms.tasks.zzu@7f93358“是否不是正确的url
问题的解决方案是使用upload任务，在它的完整监听器中编写代码，以Uri的形式获取任务的结果，并将其转换为字符串
final String name = random() + ".pdf";
dp = mpdf.child("pdf").child(name);
UploadTask uploadTask = dp.putFile(pdfuri);
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();
}
// Continue with the task to get the download URL
return dp.getDownloadUrl();
}
}).addOnCompleteListener(new OnCompleteListener<Uri>() {
@Override
public void onComplete(@NonNull Task<Uri> task) {
if (task.isSuccessful()) {
tt = title.getText().toString();
Uri downloadUri = task.getResult();
String download_url = downloadUri.toString();
String parent = getIntent().getStringExtra("type").toString();
String ch = getIntent().getStringExtra("value").toString();
GeologicDatabase.updateChild(parent, ch, "url",download_url,tt);
GeologicDatabase.updateChild(parent,ch,"name",name,tt);
Toast.makeText(addpdf.this, download_url, Toast.LENGTH_SHORT).show();
finish();
} else {
// Handle failures
// ...
}
}
});回答 2
Stack Overflow用户
回答已采纳
发布于 2018-06-05 01:27:55
getDownloadUrl()不返回URL。正如您在the javadoc中看到的那样，它返回一个产生URL的任务。您必须等待此任务完成，才能获得最终的URL。
Stack Overflow用户
发布于 2018-09-04 18:24:47
//试试这个
Task<Uri> newTask = task.getResult().getMetadata().getReference().getDownloadUrl();
newTask.addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
yourUriVariable= uri;
}
});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/50685756
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