java如何设置ListView适配器

Question

我需要帮助来制作listview适配器。下面是代码，请将适配器的值名称与roomid一起设置

JSONArray rooms = jsonObject.getJSONArray("rooms");
     for (int i = 0; i < rooms.length(); i++) {
        JSONObject room = rooms.getJSONObject(i);
       String name = room.optString("room");
       String roomid = room.optString("roomid");
      final RoomModel sched = new RoomModel();
       sched.setName(name);
       sched.setroomId(roomid);
    CustomListViewValuesArr.add(sched);}        
listView = (ListView) findViewById(R.id.ChatlistView);

房间模型。java

public class RoomModel {
    private  String name, id,  roomid;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}


public String getroomId() {
    return roomid;
}

public void setroomId(String roomid) {
    this.roomid = roomid;
}
}

Answer 1

好的，按照Sandeep的要求，我会给你们简单的提示，但我不能给你们完整的代码，你们可以直接复制和粘贴。按照指示去做就行了

为列表中的单个项目创建一个XML文件，该项目可能包含您需要的某些元素，例如它的single_item.xml有3 TextView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <TextView
        android:id="@+id/tvId"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Sample Id"
        android:textColor="#0414f4"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textSize="10sp" />

    <TextView
        android:id="@+id/tvTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="10dp"
        android:text="Sample Title"
        android:textColor="#000"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textSize="20dp"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/tvBody"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Sample body"
        android:textSize="16sp"/>
</LinearLayout>

在从主布局获得listView的引用之后，像这样设置适配器，这里modelList是一个ArrayList

    mAdapter = new CustomAdapter(MainActivity.this, R.layout.single_item, modelList);
    mAdapter.notifyDataSetChanged();
    mListView.setAdapter(mAdapter);

然后类CustomAdapter如下所示

public class CustomAdapter extends ArrayAdapter<Model> {    
    ArrayList<Model> modelList;
    Context context;    

    public CustomAdapter(Context context, int resource, ArrayList<Model> objects) {
        super(context, resource, objects);

        this.modelList = objects;
        this.context = context;

    }   

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {



        // Check if an existing view is being reused, otherwise inflate the view
        if (convertView == null) {

            convertView = LayoutInflater.from(context).inflate(R.layout.single_item,parent,false);

        }

        // Lookup view for data population
        TextView tvId = (TextView) convertView.findViewById(R.id.tvId);
        TextView tvTitle = (TextView) convertView.findViewById(R.id.tvTitle);
        TextView tvBody = (TextView) convertView.findViewById(R.id.tvBody);



        // Populate the data into the template view using the data object
        tvId.setText(String.valueOf(model.getId()));
        tvTitle.setText(model.getroomId());
        tvBody.setText(model.getName());

        // Return the completed view to render on screen
        return convertView;


    }
}

注意：我已经发表了评论，并尽可能简单地帮助您。希望这能有所帮助。如果出现任何问题，您可以发表评论

Answer 2

请尝试以下适配器

    public class MyAdapter extends BaseAdapter {

        Context con;
        ArrayList<your type> mlist;
        RoomModel sched;

        public MyAdapter(Context con,ArrayList<your type> mlist )
        {
            this.con=con;
            this.mlist=mlist;

        }


        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return mlist.length;
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return mlist[position];
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub

      sched=mlist.get(position);
        LayoutInflater inflater=(LayoutInflater)con.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView=inflater.inflate(R.layout.your_layout,parent,false);


        TextView tv1=(TextView)convertView.findViewById(R.id.your_textview);
        tv1.setText(sched.getId());

       TextView tv2=(TextView)convertView.findViewById(R.id.your_textview);
        tv2.setText(sched.getName());

       TextView tv3=(TextView)convertView.findViewById(R.id.your_textview);
        tv3.setText(sched.getroomId());

            return convertView;
        }

  }

并更改以下代码

JSONArray rooms = jsonObject.getJSONArray("rooms");
     for (int i = 0; i < rooms.length(); i++) {
        JSONObject room = rooms.getJSONObject(i);
       String name = room.optString("room");
       String roomid = room.optString("roomid");
      final RoomModel sched = new RoomModel();
       sched.setName(name);
       sched.setroomId(roomid);
    CustomListViewValuesArr.add(sched);}        
listView = (ListView) findViewById(R.id.ChatlistView);
MyAdapter adapter=new MyAdapter(this,CustomListViewValuesArr);
listView.setAdapter(adapter);