有没有办法将数据从Fragment传递到适配器的onBindViewHolder？

Question

我在片段中有一个RecyclerView，我想将片段中的数据传递给MyAdapter。请告诉我是否有办法做到这一点，或者有更好的方法来做到这一点。

public class Monday extends Fragment { 
    protected RecyclerView mRecyclerView; 
    protected RecyclerView.Adapter mAdapter; 
    protected RecyclerView.LayoutManager mLayoutManager; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.monday, container, false); 
     mRecyclerView = (RecyclerView) rootView.findViewById(R.id.monRecycler); 
     mRecyclerView.setHasFixedSize(true); 
     mLayoutManager = new LinearLayoutManager(getActivity()); 
     mRecyclerView.setLayoutManager(mLayoutManager); 


     ArrayList<MyLessons> lessons = new ArrayList<>(); 

     LocalTime now = LocalTime.now(); 
     LocalTime firstStart = new LocalTime("08:20"); 
     LocalTime firstEnd = new LocalTime("09:40"); 
     LocalTime secondStart = new LocalTime("09:50"); 
     LocalTime secondEnd = new LocalTime("11:10"); 
     LocalTime thirdStart = new LocalTime("11:30"); 
     LocalTime thirdEnd = new LocalTime("12:50"); 
     LocalTime fourthStart = new LocalTime("13:00"); 
     LocalTime fourthEnd = new LocalTime("14:20"); 
     LocalTime fifthStart = new LocalTime("14:40"); 
     LocalTime fifthEnd = new LocalTime("16:00"); 
     LocalTime sixthStart = new LocalTime("16:10"); 
     LocalTime sixthEnd = new LocalTime("17:30"); 
     LocalTime seventhStart = new LocalTime("17:50"); 
     LocalTime seventhEnd = new LocalTime("19:10"); 
     LocalTime eighthStart = new LocalTime("19:20"); 
     LocalTime eighthEnd = new LocalTime("20:40"); 


     Calendar dayOfWeek = Calendar.getInstance(); 
     int today = dayOfWeek.get(Calendar.DAY_OF_WEEK); 

     int item; 

     if (today == Calendar.MONDAY) { 
      if ((now.isAfter(firstStart)) && (now.isBefore(firstEnd)))   item = 0; 
      else if ((now.isAfter(secondStart)) && (now.isBefore(secondEnd))) item = 1; 
      else if ((now.isAfter(thirdStart)) && (now.isBefore(thirdEnd)))  item = 2; 
      else if ((now.isAfter(fourthStart)) && (now.isBefore(fourthEnd))) item = 3; 
      else if ((now.isAfter(fifthStart)) && (now.isBefore(fifthEnd)))  item = 4; 
      else if ((now.isAfter(sixthStart)) && (now.isBefore(sixthEnd)))  item = 5; 
      else if ((now.isAfter(seventhStart)) && (now.isBefore(seventhEnd))) item = 6; 
      else if ((now.isAfter(eighthStart)) && (now.isBefore(eighthEnd))) item = 7; 
      else item = 8; 
     } 
     else item = 8; 

     //I want to pass "item" to MyAdapter 

     lessons.add(new MyLessons("Lesson 1", "Teacher")); 
     lessons.add(new MyLessons("Lesson 2", "Teacher")); 
     lessons.add(new MyLessons("Lesson 3", "Teacher")); 
     lessons.add(new MyLessons("Lesson 4", "Teacher")); 
     lessons.add(new MyLessons("Lesson 5", "Teacher")); 
     lessons.add(new MyLessons("Lesson 6", "Teacher")); 
     lessons.add(new MyLessons("Lesson 7", "Teacher")); 
     lessons.add(new MyLessons("Lesson 8", "Teacher")); 

     mAdapter = new MyAdapter(lessons); 
     mRecyclerView.setAdapter(mAdapter); 

     return rootView; 
    } 

} 

---

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> { 

    private ArrayList<MyLessons> mondayLessons; 
    public MyAdapter(ArrayList<MyLessons> mondayLessons) { 
     this.mondayLessons = mondayLessons; 
    } 

    public class ViewHolder extends RecyclerView.ViewHolder { 
     private TextView subjectName; 
     private TextView teacherName; 
     private TextView itemNumber; 
     private CardView cardView; 
     private ProgressBar mProgress; 

     public ViewHolder(View itemView) { 
      super(itemView); 

      subjectName = (TextView) itemView.findViewById(R.id.textView); 
      teacherName = (TextView) itemView.findViewById(R.id.textView2); 
      itemNumber = (TextView) itemView.findViewById(R.id.textView3); 
      cardView = (CardView) itemView.findViewById(R.id.view); 
      mProgress = (ProgressBar) itemView.findViewById(R.id.lessonProgress); 
     } 
    } 

    // Create new views (invoked by the layout manager) 
    @Override 
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     // create a new view 
     View view = LayoutInflater.from(parent.getContext()).inflate(
       R.layout.my_text_layout, parent, false); 
     // set the view's size, margins, paddings and layout parameters 
     return new ViewHolder(view); 
    } 


    @Override 
    public void onBindViewHolder(ViewHolder viewHolder, int position) { 
     MyLessons place = mondayLessons.get(position); 

     viewHolder.subjectName.setText(place.getsName()); 
     viewHolder.teacherName.setText(place.gettName()); 
     viewHolder.itemNumber.setText(place.getItem()); 
     viewHolder.itemNumber.setVisibility(View.GONE); 
     //String num = viewHolder.itemNumber.getText().toString(); 
     //int item = Integer.parseInt(num); 


     //A place where I want to get "item" 

     viewHolder.mProgress.setVisibility(View.GONE); 

     if (position == item) { 
      viewHolder.cardView.setCardBackgroundColor(Color.parseColor("#9FA8DA")); 
      viewHolder.mProgress.setVisibility(View.VISIBLE); 
     } 
    } 

    @Override 
    public int getItemCount() { 
     return mondayLessons.size(); 
    } 
} 

Answer 1

我想你可以通过item到MyAdapter。

变化MyAdapter构造是这样的：

public class MyAdapter extends RecyclerView.Adapter { 

    private ArrayList<MyLessons> mondayLessons; 
    private int item 

    public MyAdapter(ArrayList<MyLessons> mondayLessons, inte item) { 
     this.mondayLessons = mondayLessons; 
     this.item = item; 
    } 

    ... 

} 

通行证item到MyAdapter。

mAdapter = new MyAdapter(lessons, item);