Question

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"。我也有写入存储权限。

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

非常感谢任何帮助。

Answer 1

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

你的问题。 getDownloadUrl()返回类似于https://firebasestorage.googleapis.com/...的内容，而getFile()的参数则需要本地文件系统可以解析的内容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，您只想使用reference.getFile(/* appropriate local file */)，而不是获取下载网址，或通过getBytes()或getStream()在内存中下载;

Firebase文本文件下载错误

1 个答案: