java - com.google.firebase.database.DatabaseException : Found two getters or fields with conflicting case sensitivity for property: user_name

Question

此代码在从 Firebase 数据库中提取数据时出错
在行中

UsersForChat usersForChat = dataSnapshot.getValue(UsersForChat.class); com.google.firebase.database.DatabaseException:发现两个 getter 或属性的大小写敏感度冲突的字段:user_name

public class Users_Display_For_Chat_Activity extends AppCompatActivity {

    FirebaseAuth firebaseAuth;

    FirebaseDatabase firebaseDatabase;
    DatabaseReference databaseReference;

    ArrayList<UsersForChat> users = new ArrayList<UsersForChat>();

    RecyclerView recyclerView;
    UsersDispalyActivtyRecyclerViewAdapter rvadapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat_);

        firebaseAuth = FirebaseAuth.getInstance();

        firebaseDatabase = FirebaseDatabase.getInstance();
        databaseReference = firebaseDatabase.getReference();

        rvadapter = new UsersDispalyActivtyRecyclerViewAdapter(this,users);



        recyclerView = (RecyclerView) findViewById(R.id.rv_UsersForChat);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(rvadapter);

        retrivedata();
    }

    public void retrivedata()
    {
        databaseReference.child("Users").addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                UsersForChat usersForChat = dataSnapshot.getValue(UsersForChat.class);
                users.add(usersForChat);
            }

            @Override
            public void onChildChanged(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onChildRemoved(DataSnapshot dataSnapshot) {

            }

            @Override
            public void onChildMoved(DataSnapshot dataSnapshot, String s) {

            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }
        });
    }
}

这是 Pojo 类 UsersForChat

public class UsersForChat {

    String User_Name,User_PhoneNo,User_Profile_Pic_Url;

    public UsersForChat()
    {

    }

    public UsersForChat(String User_Name, String User_PhoneNo, String User_Profile_Pic_Url) {
        this.User_Name = User_Name;
        this.User_PhoneNo = User_PhoneNo;
        this.User_Profile_Pic_Url = User_Profile_Pic_Url;
    }

    public String getUser_Name() {
        return User_Name;
    }

    public String getUser_PhoneNo() {
        return User_PhoneNo;
    }

    public String getUser_Profile_Pic_Url() {
        return User_Profile_Pic_Url;
    }

    public void setUser_Name(String user_Name) {
        User_Name = user_Name;
    }

    public void setUser_PhoneNo(String user_PhoneNo) {
        User_PhoneNo = user_PhoneNo;
    }

    public void setUser_Profile_Pic_Url(String user_Profile_Pic_Url) {
        User_Profile_Pic_Url = user_Profile_Pic_Url;
    }
}

Answer 1

如果您处于项目的开始阶段并且可以进行数据库更改，我建议您根据Java Naming Convention 将所有字段名称、setter 和getter 更改为小写。 .

此外，您需要将所有字段的可见性从默认访问权限更改为私有(private)访问权限，如下所示:

private String userName, userPhoneNo, userProfilePicUrl;

像这样的 setter 和 getter:

public void setUserEmail(String userEmail) {this.userEmail = userEmail;}    
public String getUserEmail() {return userEmail;}

public String getUserPhoneNo() {return userPhoneNo;}
public void setUserPhoneNo(String userPhoneNo) {this.userPhoneNo = userPhoneNo;}

public String getUserProfilePicUrl() {return userProfilePicUrl;}
public void setUserProfilePicUrl(String userProfilePicUrl) {this.userProfilePicUrl = userProfilePicUrl;}

正如您可能看到的，只有 setter 和 getter 具有公共(public)访问权限。

如果您无法更改数据库中字段的名称，那么您只需更改字段的可见性即可。