Question

我已在Firebase上存储了一些图片，当我尝试下载这些图片时，我收到了以下错误：E/StorageException: StorageException has occurred. User does not have permission to access this object. Code: -13021 HttpResult: 403。我也在使用Google身份验证。

以下是我上传图片的方式：

StorageReference storageReference = firebaseStorage.getReferenceFromUrl("gs://appname-e2a32.appspot.com").child("hImage");

UploadTask uploadTask = storageReference.putBytes(data);
uploadTask.addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        Toast.makeText(getBaseContext(), exception.getMessage(), Toast.LENGTH_SHORT).show();
        // Handle unsuccessful uploads
    }
}).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
    @Override
    public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
        // taskSnapshot.getMetadata() contains file metadata such as size, content-type, and download URL.
        Uri downloadUrl = taskSnapshot.getDownloadUrl();
        savingHelpRequest.dismiss();
        Toast.makeText(getBaseContext(), "image uploaded", Toast.LENGTH_SHORT).show();
    }
});

以下是我尝试下载的方式：

FirebaseStorage firebaseStorage = FirebaseStorage.getInstance();

storageReference = firebaseStorage.getReferenceFromUrl("gs://appname-e2a32.appspot.com").child("hImage");

storageReference.getBytes(Long.MAX_VALUE).addOnSuccessListener(new OnSuccessListener<byte[]>() {
    @Override
    public void onSuccess(byte[] bytes) {
        // Use the bytes to display the image
        ByteArrayOutputStream baoStream = new ByteArrayOutputStream();
        bytes = baoStream.toByteArray();
        bmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

    }
    }).addOnFailureListener(new OnFailureListener() {
    @Override
    public void onFailure(@NonNull Exception exception) {
        // Handle any errors
        Toast.makeText(getBaseContext(), exception.getMessage(), Toast.LENGTH_LONG).show();
    }
});

以下是安全规则：

service firebase.storage {
     match /b/appname-e2a32.appspot.com/o {
     match /{allPaths=**} {
     allow read, write;
    }
 }
}

请让我知道如何摆脱此错误并成功下载图片？

Answer 1

在Android 6.0或API 23中，我们必须从用户那里获得运行时权限，仅在清单中声明权限是不够的。

  public class SampleActivity extends AppCompatActivity {
        private static final int REQUEST_RUNTIME_PERMISSION = 1;


        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_login);
            checkPremission();
            //SomeTask(); which need permission will become like below in API 23
        }

        void checkPremission() {
            //select which permission you want
            final String permission = Manifest.permission.WRITE_EXTERNAL_STORAGE;
            if (ContextCompat.checkSelfPermission(SampleActivity.this, permission)
                    != PackageManager.PERMISSION_GRANTED) {
                if (ActivityCompat.shouldShowRequestPermissionRationale(SampleActivity.this, permission)) {
                } else {
                    ActivityCompat.requestPermissions(SampleActivity.this, new String[]{permission}, REQUEST_RUNTIME_PERMISSION);
                }
            } else {
                // you have permission go ahead launch service
                SomeTask();
            }
        }

        @Override
        public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
            switch (requestCode) {
                case REQUEST_RUNTIME_PERMISSION:
                    final int numOfRequest = grantResults.length;
                    final boolean isGranted = numOfRequest == 1
                            && PackageManager.PERMISSION_GRANTED == grantResults[numOfRequest - 1];
                    if (isGranted) {
                        // you have permission go ahead
                        SomeTask();
                    } else {
                        // you dont have permission show toast
                    }
                    break;
                default:
                    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            }
        }


        void SomeTask() {
            FirebaseStorage firebaseStorage = FirebaseStorage.getInstance();
            storageReference = firebaseStorage.getReferenceFromUrl("gs://appname-e2a32.appspot.com");
            storageReference.getBytes(Long.MAX_VALUE).addOnSuccessListener(new OnSuccessListener<byte[]>() {
                @Override
                public void onSuccess(byte[] bytes) {
                    // Use the bytes to display the image
                    ByteArrayOutputStream baoStream = new ByteArrayOutputStream();
                    bytes = baoStream.toByteArray();
                    bmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
                }
            }).addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception exception) {
                    // Handle any errors
                    Toast.makeText(getBaseContext(), exception.getMessage(), Toast.LENGTH_LONG).show();
                }
            });
        }
    }

即使将我的规则设置为公共，也会获得“StorageException”。请看细节

1 个答案: