Question

我是Firebase数据库的新手，我不知道为什么无法从数据库将数据获取到对象中

当我从Firebase数据库中调用数据时，这将提供正确的数据，但是我无法将其设置为对象或文本视图的任何帮助，请检查Firebase数据库的屏幕截图，这是我的数据库屏幕，以便如何从该类型的JSON获取数据

public class ProfileFrag extends Fragment {
TextView name,companyName,emailAddress, mobileNumber,companyAddress;
  FirebaseDatabase database;
    DatabaseReference myRef;
 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        // init
        name = view.findViewById(R.id.name);
        companyName = view.findViewById(R.id.company_name);
        emailAddress = view.findViewById(R.id.gmail_address);
        mobileNumber = view.findViewById(R.id.mobile_number);
        companyAddress = view.findViewById(R.id.address);


        database = FirebaseDatabase.getInstance();
        SharedPreferences sharedPreferences = getActivity().getSharedPreferences("Data", MODE_PRIVATE);
        String key = sharedPreferences.getString("Key","");

        myRef = FirebaseDatabase.getInstance().getReference().child(key).child("PersonalData");

        myRef.addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
         BossModel data =  dataSnapshot.child("PersonalData").getValue(BossModel.class);
                companyAddress.setText(data.getCompanyAddress());
                name.setText(data.getName());
                companyName.setText(data.getCompanyName());
                emailAddress.setText(data.getEmailAddress());
                mobileNumber.setText(data.getMobileNumber());  }

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

            }

            @Override
            public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) {

            }

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

            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        });

        return view;
    }
}

登录后我确实是这样

Map<String,Object> boss = new HashMap<>();
                    boss.put("Name",sFullName.getText().toString().trim());
                    boss.put("Company Name",sCompanyName.getText().toString().trim());
                    boss.put("Email Address",sEmailAddress.getText().toString().trim());
                    boss.put("Mobile Number",sMobileNumber.getText().toString().trim());
                    boss.put("Company Address",sCompanyAddress.getText().toString().trim());
                    String key = userRef.push().getKey();
                    SharedPreferences sharedPreferences = getSharedPreferences("Data", MODE_PRIVATE);
                    SharedPreferences.Editor editor = sharedPreferences.edit();
                    editor.putString("Key",key);
                    editor.apply();
                    userRef.child(key).child("PersonalData").setValue(boss);
                    signIn();

我也正在附加Firebase数据库的屏幕截图firebase database screen

here is error screen

Answer 1

您正在从错误的节点获取数据。

myRef = FirebaseDatabase.getInstance().getReference().child(key).child("PersonalData");

您已经在

key->PersonalData

通知：您确定数据库没有父节点吗？您能告诉我完整的数据库结构吗？如果确定，请进行如下更改。

myRef = FirebaseDatabase.getInstance().getReference().child(key).child("PersonalData");

    myRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onValueChanged(@NonNull DataSnapshot dataSnapshot) {
//Here I made change
     BossModel data =  dataSnapshot.getValue(BossModel.class);
            companyAddress.setText(data.getCompanyAddress());
            name.setText(data.getName());
            companyName.setText(data.getCompanyName());

 emailAddress.setText(data.getEmailAddress());


   mobileNumber.setText(data.getMobileNumber());  }
//The rest are the same.

注意：如果不能解决问题，我需要查看您的完整数据库结构。

无法从Firebase的快照获取数据。对象始终为空

1 个答案: