无法解析符号ID [英] Cannot resolve Symbol id

问题描述

我有一个recylcerView称为"Notes"，我试图添加一个新的称为"Assignments"的recylerview，这将在notes recylerview项内创建. 当我单击recylerview项(注释)时，它将把我发送到ClassworkActivity，其中作业的recyclerview将被添加到其中. 因此，我想将作业recyclerview添加为notes recyclerview的子代.

I have a recylcerView calles "Notes", I'm trying to add an new recylerview called "Assignments" wich will be created inside the notes recylerview item. When I click on a recylerview item (notes) it send me to ClassworkActivity in wich the assignments' recyclerview will be added to it. So I want to add the assignment recyclerview as a child of the notes recyclerview.

这就是我尝试过的:

final AssignmentAdapter assignmentAdapter=new AssignmentAdapter(assignlist,this);
recyclerView.setAdapter(assignmentAdapter);

FloatingActionButton fab = findViewById(R.id.fab);


mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();


String userID = mCurrentUser.getUid();


firebaseDatabase=FirebaseDatabase.getInstance();

databaseReference = firebaseDatabase.getReference().child("Users").child(userID).child("Notes").child(id).child("Assignments");
databaseReference.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

        for(DataSnapshot dataSnapshot1: dataSnapshot.getChildren())
        {
            AssignListdata listdata=dataSnapshot1.getValue(AssignListdata.class);
            assignlist.add(listdata);

        }
        assignmentAdapter.notifyDataSetChanged();

    }

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

    }
});

// fab
fab.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        startActivity(new Intent(getApplicationContext(), AddAssignmentActivity.class));
    }
});

但我在此行遇到错误:

databaseReference = firebaseDatabase.getReference().
child("Users").
child(userID).
child("Notes").
child(id).
child("Assignments");

因为我没有创建变量id:child(id).，它是注释列表的ID 谁能告诉我如何声明此变量?

since I didn't create the variable id : child(id). which is the id of the Notes List Can anyone tell me how to declare this variable ?

另一件事是，分配是在NotesActivity中而不是在ClassworkActivity中创建为Notes的！

Another thing is that the assignments are created as a Notes in the NotesActivity, not in the ClassworkActivity !

另外，这是我项目的github链接，请看一下: Notes应用

Also, this is a github link of my project, Please take a look at it : Notes App

请帮助！

推荐答案

当您单击Notes的recyclerView项时，获得noteID用来单击位置的信息.

When you click on recyclerView item of Notes, get the noteID usinng which position is clicked.

现在，当您打开ClassworkActivity时，请使用意图将其绑定，并在ClassworkActivity onCreate()中获取它，并在创建AssignmentAdapter时使用该noteID作为ID.

now when you open ClassworkActivity, bind that id with intent and get it in ClassworkActivity onCreate() and while creating AssignmentAdapter use that noteID as id.

通过intent传递noteId:

pass noteId using intent as:

Intent myIntent = new Intent(CurrentActivity.this, ClassworkActivity.class); // UPDATE CURRENT ACTIVITY NAME
myIntent.putExtra("noteID", noteID);
startActivity(myIntent);

并在ClassworkActivity onCreate()中以以下方式接收:

and receive in ClassworkActivity onCreate() as:

Intent mIntent = getIntent();
int id = mIntent.getIntExtra("noteID", 0);

这篇关于无法解析符号ID的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！