刷新AlertDialog上的RecyclerView关闭

Question

I have a list of notes, there is a dialog thats opened to add a new note, and when the dialog is closed, it is saved to the database, how do i get the recyclerview to refresh once the dialog has been closed to show the new note added.

recyclerView = (RecyclerView)findViewById(R.id.assignment_notes_recyclerview);
        layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setHasFixedSize(true);
        UserDbHelper userDbHelper = new UserDbHelper(this);
        SQLiteDatabase sqLiteDatabase = userDbHelper.getReadableDatabase();

        Cursor cursor = userDbHelper.getAssignmentNotes( selected, sqLiteDatabase);

        cursor.moveToFirst();
        do {
            NoteDataProvider noteDataProvider = new NoteDataProvider(cursor.getString(0), cursor.getString(2), cursor.getString(3));
            arrayList.add(noteDataProvider);
        }while(cursor.moveToNext());
        userDbHelper.close();



        adapter = new NoteDataAdapter(arrayList);
        recyclerView.setAdapter(adapter);

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


                AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context);
                LayoutInflater inflater = getLayoutInflater();
                final View dialogView = inflater.inflate(R.layout.layout_assignment_note_dialog, null);
                dialogBuilder.setView(dialogView);

                final EditText note = (EditText) dialogView.findViewById(R.id.edit1);

                dialogBuilder.setTitle("Assignment Notes");
                dialogBuilder.setMessage("Enter te note below");
                dialogBuilder.setPositiveButton("Save", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        //save button has been pressed
                        String done = "No";
                        String content = note.getText().toString();
                        userDbHelper1 = new UserDbHelper(context);
                        sqLiteDatabase1 = userDbHelper1.getReadableDatabase();
                        userDbHelper1.addAssignmentNote(selected, content, done, sqLiteDatabase1);


                    }
                });
                dialogBuilder.setNegativeButton("Discard", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        //pass
                    }
                });
                AlertDialog b = dialogBuilder.create();
                b.show();
            }
        });

Answer 1

To Refresh RecyclerView , Add the new element to the ArrayList which is Being used by the RecyclerViewAdapter class, which in your case is arrayList .

arrayList.add(<Your item here >);

Then refresh with,

adapter.notifyDataSetChanged();