无法解决符号链接

Question

我在此行中出错：最终用户=新用户（地址，confirmPassword，UserEmail，密码，电话号码，用户名，链接）；

，错误是“无法解决符号链接”

private DatabaseReference Userdatabase;
private StorageReference storageReference;
private FirebaseAuth firebaseAuth;

private StorageTask mUploadTask;

private Uri imageUri;

ImageView imageView;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_signup);

    imageView = (ImageView) findViewById(R.id.imageView);

    firebaseAuth = FirebaseAuth.getInstance();

    Userdatabase = FirebaseDatabase.getInstance().getReference("User");

    progressDialog = new ProgressDialog(Signup.this);

    storageReference = FirebaseStorage.getInstance().getReference("Seller");

    signupButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            RegisterAccount();

        }
    });

    imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            selectImage();
        }
    });
}

public void selectImage() {
    Intent photoPickerIntent = new Intent();
    photoPickerIntent.setType("image/*");
    photoPickerIntent.setAction(Intent.ACTION_PICK);
    startActivityForResult(photoPickerIntent, PICK_IMAGE_REQUEST);
}

private String getFileExtension(Uri uri) {
    ContentResolver cR = getContentResolver();
    MimeTypeMap mime = MimeTypeMap.getSingleton();
    return mime.getExtensionFromMimeType(cR.getType(uri));
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {


        imageUri = data.getData();
        Picasso.with(this).load(imageUri).into(imageView);

    }
}


public void RegisterAccount() {

    final String email = emailText.getText().toString();
    final String username = nameText.getText().toString();

    if ((TextUtils.isEmpty(address))) {
        addressText.setError("address is required");
        addressText.requestFocus();
        return;
    }

    AddUser(email, username, pass, phone, comfirmpass, address);

}

public void AddUser(final String UserEmail, final String Username, final String Password,
                    final String PhoneNumber, final String confirmPassword, final String Address) {

    String email = UserEmail.replace(".", ",");

    Userdatabase = FirebaseDatabase.getInstance().getReference("User").child(email);


    Userdatabase.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            if (dataSnapshot.exists()) {

                String value = dataSnapshot.getValue(String.class);

                Log.i(TAG, "UserEmail : " + value + " Had Already Exist");

                Toasty.warning(getApplicationContext(), "The Email you use already Exist !", Toast.LENGTH_SHORT, true).show();
                return;
            }


            if (!dataSnapshot.exists()) {
                if (imageUri != null) {
                  final  StorageReference fileReference = storageReference.child(System.currentTimeMillis()
                            + "." + getFileExtension(imageUri));



                    mUploadTask = fileReference.putFile(imageUri)
                            .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                                @Override
                                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                                    fileReference.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                                        @Override
                                        public void onSuccess(Uri downloadUri) {
                                            String link = downloadUri.toString();
                                            Toast.makeText(Signup.this, "Register successful", Toast.LENGTH_LONG).show();
                                            final User user = new User(Address, confirmPassword, UserEmail, Password, PhoneNumber, Username,
                                                    link);
                                            Userdatabase.setValue(user);
                                        }
                                    });
                                }
                            });
                }
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {
            return;
        }
    });

    firebaseAuth.createUserWithEmailAndPassword(UserEmail, Password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {

            progressDialog.dismiss();

            if (!task.isSuccessful()) {
                Log.i(TAG, "Buyer FirebaseAuth Register : Fail");
                Toasty.error(getApplicationContext(), "The Email you use already Exist !", Toast.LENGTH_SHORT, true).show();
                } else {
                Log.i(TAG, "Buyer FirebaseAuth Register : Success");
                UserEmail.replace(".", ",");
                final User user = new User(Address, confirmPassword, UserEmail, Password, PhoneNumber, Username,link);
                Userdatabase.addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                        if (!dataSnapshot.exists()) {
                            Userdatabase.setValue(user);
                            Log.i(TAG, "FirebaseDatabase Add Buyer : Success");
                            Toasty.success(getApplicationContext(), "Register Complete", Toast.LENGTH_SHORT, true).show();
                            }
                            }
                            @Override
                            public void onCancelled(@NonNull DatabaseError databaseError) {
                        Log.w(TAG, "Database Error");
                        }
                        });
                }
                }
                });
}

如果您需要更多详细信息，请删除以下代码。有人可以帮忙吗？非常感谢您的帮助

Answer 1

在类的开头声明与其他变量的链接，然后在需要时设置链接。它无法解析符号链接，因为它在您调用它的上下文中不存在。

private DatabaseReference Userdatabase;
private StorageReference storageReference;
private FirebaseAuth firebaseAuth;
private String link;

private StorageTask mUploadTask;

private Uri imageUri;

ImageView imageView;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_signup);

    imageView = (ImageView) findViewById(R.id.imageView);

    firebaseAuth = FirebaseAuth.getInstance();

    Userdatabase = FirebaseDatabase.getInstance().getReference("User");

    progressDialog = new ProgressDialog(Signup.this);

    storageReference = FirebaseStorage.getInstance().getReference("Seller");

    signupButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            RegisterAccount();

        }
    });

    imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            selectImage();
        }
    });
}

public void selectImage() {
    Intent photoPickerIntent = new Intent();
    photoPickerIntent.setType("image/*");
    photoPickerIntent.setAction(Intent.ACTION_PICK);
    startActivityForResult(photoPickerIntent, PICK_IMAGE_REQUEST);
}

private String getFileExtension(Uri uri) {
    ContentResolver cR = getContentResolver();
    MimeTypeMap mime = MimeTypeMap.getSingleton();
    return mime.getExtensionFromMimeType(cR.getType(uri));
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {


        imageUri = data.getData();
        Picasso.with(this).load(imageUri).into(imageView);

    }
}


public void RegisterAccount() {

    final String email = emailText.getText().toString();
    final String username = nameText.getText().toString();

    if ((TextUtils.isEmpty(address))) {
        addressText.setError("address is required");
        addressText.requestFocus();
        return;
    }

    AddUser(email, username, pass, phone, comfirmpass, address);

}

public void AddUser(final String UserEmail, final String Username, final String Password,
                    final String PhoneNumber, final String confirmPassword, final String Address) {

    String email = UserEmail.replace(".", ",");

    Userdatabase = FirebaseDatabase.getInstance().getReference("User").child(email);


    Userdatabase.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            if (dataSnapshot.exists()) {

                String value = dataSnapshot.getValue(String.class);

                Log.i(TAG, "UserEmail : " + value + " Had Already Exist");

                Toasty.warning(getApplicationContext(), "The Email you use already Exist !", Toast.LENGTH_SHORT, true).show();
                return;
            }


            if (!dataSnapshot.exists()) {
                if (imageUri != null) {
                  final  StorageReference fileReference = storageReference.child(System.currentTimeMillis()
                            + "." + getFileExtension(imageUri));



                    mUploadTask = fileReference.putFile(imageUri)
                            .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                                @Override
                                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {

                                    fileReference.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
                                        @Override
                                        public void onSuccess(Uri downloadUri) {
                                            link = downloadUri.toString();
                                            Toast.makeText(Signup.this, "Register successful", Toast.LENGTH_LONG).show();
                                            final User user = new User(Address, confirmPassword, UserEmail, Password, PhoneNumber, Username,
                                                    link);
                                            Userdatabase.setValue(user);
                                        }
                                    });
                                }
                            });
                }
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {
            return;
        }
    });

    firebaseAuth.createUserWithEmailAndPassword(UserEmail, Password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {

            progressDialog.dismiss();

            if (!task.isSuccessful()) {
                Log.i(TAG, "Buyer FirebaseAuth Register : Fail");
                Toasty.error(getApplicationContext(), "The Email you use already Exist !", Toast.LENGTH_SHORT, true).show();
                } else {
                Log.i(TAG, "Buyer FirebaseAuth Register : Success");
                UserEmail.replace(".", ",");
                final User user = new User(Address, confirmPassword, UserEmail, Password, PhoneNumber, Username,link);
                Userdatabase.addListenerForSingleValueEvent(new ValueEventListener() {
                    @Override
                    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                        if (!dataSnapshot.exists()) {
                            Userdatabase.setValue(user);
                            Log.i(TAG, "FirebaseDatabase Add Buyer : Success");
                            Toasty.success(getApplicationContext(), "Register Complete", Toast.LENGTH_SHORT, true).show();
                            }
                            }
                            @Override
                            public void onCancelled(@NonNull DatabaseError databaseError) {
                        Log.w(TAG, "Database Error");
                        }
                        });
                }
                }
                });
}

Answer 2

您收到该错误，因为您的声明：

String link = downloadUri.toString();

不在范围内。您不能简单地在link方法中使用addsuccesslistener中声明的字符串onComplete()，因为它的范围是完全不同的。在声明字符串的范围内，只能仅看到字符串link。除此之外，这两种方法都具有异步行为。因此，即使您将该变量设为全局变量，也无法解决问题。我能看到的最简单的解决方法是在您的onComplete()方法中使用link作为一个空字符串：

final User user = new User(
    Address,
    confirmPassword,
    UserEmail,
    Password,
    PhoneNumber,
    Username,
    "" //empty String
);

并在获取时进行相应的更新。

另请参阅 here 。