Question

在此之前，我正在使用ListView，它工作正常。但我想将ListView设置为水平。所以我开始知道RecycleView比listview更可靠。

我正在尝试使用回收视图并收到类似

的错误

 No adapter attached; skipping layout

这意味着问题出在我的适配器类中，我不知道我的适配器类需要什么代码我只是这样尝试。

main.java

public class DynamicButon extends Fragment {
    public DynamicButon(){};
    JSONObject jsonobject;
    JSONArray ownerObj;
     private RecyclerView mRecyclerView;
private RecyclerView.LayoutManager mLayoutManager;


    ListViewAdapterDynamic mAdapter;
    ArrayList<HashMap<String, String>> arraylist;
    String uid = "0";
    SessionManager session;
    private static String url_visitor = "";
    JSONParser jParser = new JSONParser();
    ArrayList<String> itemwod = new ArrayList<String>();

    View view;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.activity_dynamic_buton, container, false);
        getActivity().setTitle("Complete Order");
        // listview = (ListView) view.findViewById(R.id.lvvisit);

        session = new SessionManager(getActivity());
        HashMap<String, String> user = session.getUserDetails();
        uid = user.get(SessionManager.KEY_ID);
        new DownloadJSON().execute();
        return view;
    }

    private class DownloadJSON extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
          //  avi.show();
        }

        @Override
        protected Void doInBackground(Void... args) {
            try {
                arraylist = new ArrayList<HashMap<String, String>>();
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("username", uid));
                JSONObject json = jParser.makeHttpRequest(url_visitor, "GET", params);

                int success1 = Integer.parseInt(json.getString("success4"));
                Log.d("success4", json.toString());

                if (success1 == 0) {
                    Snackbar.make(view, "Not Data Found", Snackbar.LENGTH_LONG).show();
                }
                if (success1 == 1) {
                    ownerObj = json.getJSONArray("cy");

                    for (int i = 0; i < ownerObj.length(); i++) {
                        jsonobject = ownerObj.getJSONObject(i);

                        item.add(jsonobject.getString("company"));
                    }
                }
            } catch (Exception e) {
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void args) {


 mRecyclerView = (RecyclerView)getActivity().findViewById(R.id.mylist);
        mLayoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.HORIZONTAL, false);
        mRecyclerView.setLayoutManager(mLayoutManager);

        mAdapter = new ListViewAdapterDynamic(getActivity(), itemwod);
        mRecyclerView.setAdapter(mAdapter);
        }
    }
}

ListViewAdapter

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;

import java.util.ArrayList;
import java.util.HashMap;

/**
 * Created by sachin on 3/15/2017.
 */

public class ListViewAdapterDynamic extends BaseAdapter {
    Context cntx;

    View view;

    ArrayList<String> itemwod = new ArrayList<String>();

    LayoutInflater inflater;
    ArrayList<HashMap<String, String>> data;
    HashMap<String, String> resultp = new HashMap<String, String>();

    public ListViewAdapterDynamic(Context context,
                                        ArrayList<String> o_parties
    ) {
        // TODO Auto-generated constructor stub
        cntx = context;
        itemwod = o_parties;
    }

    @Override
    public int getCount() {
        return itemwod.size();
    }

    @Override
    public Object getItem(int position) {
        return itemwod.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @SuppressWarnings("deprecation")
    public View getView(final int position, View convertView, ViewGroup parent) {

        Button cancel;

        inflater = (LayoutInflater) cntx
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        LayoutInflater inflater = LayoutInflater.from(cntx);

        convertView = inflater.inflate(R.layout.raw_dynamic, parent,
                false);


         cancel=(Button)convertView.findViewById(R.id.btn) ;
        cancel.setText(itemwod.get(position));
        return convertView;
    }


}

像这样我尝试但不在ListViewAdapterDynamic中工作我试图实现

  RecyclerView.Adapter<MyViewHolder>

然后得到错误，这就是为什么我只是继续扩展Baseadapter我所做的listview。

Answer 1

使用RecyclerView代替ListView。我打赌你不会后悔的。将LayoutManager设置为 HORIZONTAL 。请按以下步骤操作：

首先 ADD xml中的RecyclerView：

  <android.support.v7.widget.RecyclerView
       android:id="@+id/recycler_view"
       android:layout_width="match_parent"
       android:layout_height="wrap_content" />

在片段

中

private RecyclerView mRecyclerView;
private RecyclerView.LayoutManager mLayoutManager;

在onPostExecute()：

mRecyclerView = (RecyclerView)getActivity().findViewById(R.id.recycler_view);
mLayoutManager = new LinearLayoutManager(
                this,
                LinearLayoutManager.HORIZONTAL,
                false
        );
mRecyclerView.setLayoutManager(mLayoutManager);

Here是一个简单的教程，您可以遵循Horizontal RecyclerView。

Answer 2

使用RecyclerView设置列表项目。

参考https://acadgild.com/blog/horizontal-listview-android/

Answer 3

LinearLayoutManager layoutManager= new LinearLayoutManager(this,LinearLayoutManager.HORIZONTAL, false);
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(layoutManager);

使用recylerview。

Answer 4

使用具有水平方向的回收视图点击此链接 https://developer.android.com/training/material/lists-cards.html

Answer 5

在这里，您可以找到有关如何使用回收站视图水平设置列表视图的教程

https://www.codeproject.com/Articles/1152595/Android-Horizontal-ListView-Tutorial

listview不支持线性布局中的水平滚动

Answer 6

将此库用于Horizontal ListView。奇迹般有效。

https://github.com/MeetMe/Android-HorizontalListView

如何在RecycleVIew中初始化适配器？

6 个答案: