Firebase 文本文件下载错误

Posted 2023-03-14

【中文标题】Firebase 文本文件下载错误

【英文标题】：Firebase Text File download error

【发布时间】：2017-01-24 02:59:56

【问题描述】：

我是 android 和 Firebase 的新手。基本上，我正在尝试从 Firebase 下载文件并将其存储在 Android 存储中，但我收到了一个奇怪的错误 "ENOENT: No such file or directory error"。我也有写存储权限。

代码：

public class MainActivity extends AppCompatActivity


private StorageReference mStorageRef;
@Override
protected void onCreate(Bundle savedInstanceState)

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mStorageRef = FirebaseStorage.getInstance().getReference().child("20JAN2017.txt");
    System.out.println("......"+mStorageRef);
    Uri url;

    mStorageRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() 
        @Override
        public void onSuccess(Uri uri)
        
            FileDownloadTask file = mStorageRef.getFile(uri);

            file.addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() 
                @Override
                public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) 
                    System.out.println("task snapshot..."+taskSnapshot.getStorage());
                
            );
            file.addOnFailureListener(new OnFailureListener() 
                @Override
                public void onFailure(@NonNull Exception e) 
                    System.out.println("Error:"+e);

                
            );
            file.addOnCompleteListener(new OnCompleteListener<FileDownloadTask.TaskSnapshot>() 
                @Override
                public void onComplete(@NonNull Task<FileDownloadTask.TaskSnapshot> task) 
                    System.out.println("task completed");
                
            );
        
    );

错误：

01-23 21:53:19.502 10974-11033/indian.stock.screener E/FileDownloadTask: Exception occurred during file download
                                                                         java.io.IOException: open failed: ENOENT (No such file or directory)
                                                                             at java.io.File.createNewFile(File.java:946)
                                                                             at com.google.firebase.storage.FileDownloadTask.run(Unknown Source)
                                                                             at com.google.firebase.storage.StorageTask$8.run(Unknown Source)
                                                                             at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
                                                                             at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
                                                                             at java.lang.Thread.run(Thread.java:841)
                                                                          Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
                                                                             at libcore.io.Posix.open(Native Method)
                                                                             at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
                                                                             at java.io.File.createNewFile(File.java:939)
                                                                             at com.google.firebase.storage.FileDownloadTask.run(Unknown Source) 
                                                                             at com.google.firebase.storage.StorageTask$8.run(Unknown Source) 
                                                                             at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) 
                                                                             at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) 
                                                                             at java.lang.Thread.run(Thread.java:841) 
01-23 21:53:19.712 10974-11033/indian.stock.screener E/StorageException: StorageException has occurred.
                                                                         An unknown error occurred, please check the HTTP result code and inner exception for server response.
                                                                          Code: -13000 HttpResult: 200

任何帮助将不胜感激。

【问题讨论】：

您想将该文件保存在哪里？输入显示保存文件的绝对路径的代码。

【参考方案1】：

mStorageRef.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() 
    @Override
    public void onSuccess(Uri uri) 
        FileDownloadTask file = mStorageRef.getFile(uri);
        ...
);

是你的问题。 getDownloadUrl() 返回类似：https://firebasestorage.googleapis.com/... 而 getFile() 的参数期望本地文件系统可以解析 file:///tmp/...。

contentResolver 无法解析 HTTPS URL，因为它无法写入 URL（它不是文件系统可以访问的文件）。

真的，你只想使用reference.getFile(/* appropriate local file */)，而不是获取下载URL，或者通过getBytes()或getStream()在内存中下载；