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Question

公共類chapterIndexFragment延伸片段實現view.OnClickListener，parsexml.AsyncResponse {

// TODO：重命名參數的參數，選擇匹配 //片段名稱初始化參數，例如ARG_ITEM_NUMBER

private static final String ARG_PARAM1 = "xml"; 
//private static final String ARG_PARAM2 = "param2"; 
private XmlResourceParser xrp; 
private View rootview; 
private OnFragmentInteractionListener mListener; 
private RecyclerView mRecyclerView; 
private RecyclerView.Adapter mAdapter; 
private RecyclerView.LayoutManager mLayoutManager; 

public chapterIndexFragment() { 
    // Required empty public constructor 
} 

/** 
* Use this factory method to create a new instance of 
* this fragment using the provided parameters. 
* 
* @param param1 Parameter 1. 
* @param param2 Parameter 2. 
* @return A new instance of fragment chapterIndexFragment. 
*/ 
// TODO: Rename and change types and number of parameters 
public static chapterIndexFragment newInstance(int xmlid) { 
    chapterIndexFragment fragment = new chapterIndexFragment(); 
    Bundle args = new Bundle(); 

    args.putInt(ARG_PARAM1,xmlid); 
    fragment.setArguments(args); 
    return fragment; 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    if (getArguments() != null) { 
     xrp = getResources().getXml(getArguments().getInt(ARG_PARAM1)); 

     //Async Task. 
     parsexml pxml = new parsexml(this); 
     pxml.execute(xrp); 
    } 
} 

@Override 
public void postProgress(String progress) { 

    // Why this does not resolve ???? 
    mAdapter.mDataset 

} 

@Override 
public void onFinish(Boolean result) { 

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    // Inflate the layout for this fragment 
    rootview = inflater.inflate(R.layout.fragment_recycler_view, container, false); 

    mRecyclerView = (RecyclerView) rootview.findViewById(R.id.recycler_view); 

    // use this setting to improve performance if you know that changes 
    // in content do not change the layout size of the RecyclerView 
    mRecyclerView.setHasFixedSize(true); 

    // use a linear layout manager 
    mLayoutManager = new LinearLayoutManager(getActivity()); 
    mRecyclerView.setLayoutManager(mLayoutManager); 

    // When coming back to this fragment from another fragment with back button. Although view hierarchy is to 
    //be built again but Adapter will have its data preserved so dont initialize again. 

    //String[] TempData = new String[]{"One","Two","three","four"}; 

    if(mAdapter == null) 
     mAdapter = new MyAdapter(); 

    mRecyclerView.setAdapter(mAdapter); 
    return rootview; 
} 

// TODO: Rename method, update argument and hook method into UI event 
public void onButtonPressed(Uri uri) { 
    if (mListener != null) { 
     mListener.onFragmentInteraction(uri); 
    } 
} 

@Override 
public void onAttach(Context context) { 
    super.onAttach(context); 
    if (context instanceof OnFragmentInteractionListener) { 
     mListener = (OnFragmentInteractionListener) context; 
    } else { 
     throw new RuntimeException(context.toString() 
       + " must implement OnFragmentInteractionListener"); 
    } 
} 

@Override 
public void onActivityCreated(@Nullable Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 

    Toolbar toolbar = (Toolbar) getActivity().findViewById(R.id.toolbar); 
    toolbar.setTitle("Title"); 
    toolbar.setNavigationIcon(R.drawable.ic_menu_hamburger); 
    //toolbar navigation button (Home Button\Hamburger button) at the start of the toolbar. 
    toolbar.setNavigationOnClickListener(this); 
    //Toolbar menu item click listener. 
    //toolbar.setOnMenuItemClickListener(this); 
} 

@Override 
public void onDetach() { 
    super.onDetach(); 
    mListener = null; 
} 

@Override 
public void onClick(View view) { 

    int id = view.getId(); 
    switch(id) 
    { 
     case -1: // Toolbar's Navigation button click retruns -1. Hamburger icon. 

      if (view instanceof ImageView) 
     { 

      if (((MainActivity)getActivity()).drawer.isDrawerOpen(GravityCompat.START)) 
      { 
       ((MainActivity)getActivity()).drawer.closeDrawer(GravityCompat.START); 
      } 
      else 
      { 
       ((MainActivity)getActivity()).drawer.openDrawer(GravityCompat.START); 
      } 
     } 
      break; 
    } 
} 

/** 
* This interface must be implemented by activities that contain this 
* fragment to allow an interaction in this fragment to be communicated 
* to the activity and potentially other fragments contained in that 
* activity. 
* <p> 
* See the Android Training lesson <a href= 
* "http://developer.android.com/training/basics/fragments/communicating.html" 
* >Communicating with Other Fragments</a> for more information. 
*/ 
public interface OnFragmentInteractionListener { 
    // TODO: Update argument type and name 
    void onFragmentInteraction(Uri uri); 
} 


class MyAdapter extends RecyclerView.Adapter implements MyViewHolder.IItemClickListener{ 
    private ArrayList<String> mDataset; 

    // Provide a suitable constructor (depends on the kind of dataset) 
    MyAdapter(){ 
     if(mDataset == null) 
     { 
      mDataset = new ArrayList<String>(); 
     } 

    } 


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

    // Replace the contents of a view (invoked by the layout manager) 

    @Override 
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { 

     // - get element from your dataset at this position 
     // - replace the contents of the view with that element 
     MyViewHolder vh = (MyViewHolder)holder; 
     vh.mtv_Title.setText(mDataset.get(position)); 

    } 

    // Return the size of your dataset (invoked by the layout manager) 
    @Override 
    public int getItemCount() { 
     return mDataset.size(); 
    } 

    //MyViewHolder.IItemClickListener 
    @Override 
    public void onItemClick(View view, int position) { 

    } 
} 

// Provide a reference to the views for each data item 
// Complex data items may need more than one view per item, and 
// you provide access to all the views for a data item in a view holder 
static class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener { 
    // each data item is just a string in this case 
    TextView mtv_Title; 
    IItemClickListener mItemClickListener; 

    //View.OnClickListener 
    @Override 
    public void onClick(View view) { 
    mItemClickListener.onItemClick(view,getAdapterPosition()); 
    } 

    interface IItemClickListener 
    { 
     void onItemClick(View view, int position); 
    } 

    MyViewHolder(View v,IItemClickListener itemClickListener) { 
     super(v); 
     mtv_Title = (TextView)v.findViewById(R.id.tv_title); 
     mItemClickListener = itemClickListener; 
     v.setOnClickListener(this); 
    } 
} 

}

在@覆蓋 公共無效postProgress（字符串進度）{

// Why this does not resolve ???? 
    mAdapter.mDataset 

} 

Answer 1

你應該知道的是，

私有成員不能通過點符號訪問。要訪問它們，我們使用getter/setter方法。

你必須做一個公共職能，讓他們在你內部類中添加這個方法，

public ArrayList<String> getDataSet() { 

    return mDataSet; 
} 

而且通過@android_hub

private RecyclerView.Adapter mAdapter; 

爲指向應該是你應該改變私人的

private MyAdapter mAdapter;