如何在json对象生成的列表视图上添加ADD AS A FRIEND按钮

时间:2012-07-23 04:46:25

标签: android listview

嗨我有一个从json对象派生的人员列表,并按照下面的方式放入列表视图。我想在名称前面添加一个添加按钮,而不是进行onslect并将其移动到新活动。

我该怎么做?

以下是我如何将我的数据发布到列表视图中。我可以从xml中添加一个按钮来定义行。但是如何设置或者如何编码button.onclick?

ArrayList<HashMap<String, String>> friendslist = new ArrayList<HashMap<String, String>>();
            JSONArray jArray = new JSONArray(result);
            if (jArray != null) {
                for (int i = 0; i < jArray.length(); i++) {
                    JSONObject json_data = jArray.getJSONObject(i);
                    HashMap<String, String> map = new HashMap<String, String>();

                    a = json_data.getString("user_id");

                    map.put(TAG_Name, json_data.getString("fname"));
                    map.put(TAG_LName, json_data.getString("lname"));
                    friendslist.add(map);
                }
            }
            list = (ListView) findViewById(R.id.addfrndslist);

            ListAdapter adapter = new SimpleAdapter(this, friendslist,
                    R.layout.add_yourfriendswith, new String[] { TAG_Name,
                            TAG_LName}, new int[] { R.id.afname,
                            R.id.alname});
            list.setAdapter(adapter);

2 个答案:

答案 0 :(得分:0)

您必须创建自定义列表适配器才能将Button添加到列表行。

将此内容写入

final ListView itemlist = (ListView) findViewById(R.id.itemlist);

itemlist.setAdapter(new PodcastListAdapter(this));

然后创建自定义BaseAdapter类

class ViewHolder {
TextView txtTitle;
TextView txtDescription;
Button btnDownload;
}

public class PodcastListAdapter extends BaseAdapter {

private LayoutInflater mInflater;
private Context context;

public PodcastListAdapter(Context cont) {
    mInflater = LayoutInflater.from(cont);
    context = cont;
}

public int getCount() {
    return Utilities.arrayRSS.size();
}

public Object getItem(int position) {
    return Utilities.arrayRSS.get(position);
}

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

public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder holder;
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.custom_list, null);
        holder = new ViewHolder();
        holder.txtTitle = (TextView) convertView.findViewById(R.id.title);
        holder.txtDescription = (TextView) convertView
                .findViewById(R.id.description);
        holder.btnDownload = (Button) convertView
                .findViewById(R.id.btnDownload);

        holder.btnDownload.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                new DownloadingProgressTask(position, holder).execute();
                holder.btnDownload
                        .setBackgroundResource(R.drawable.downloading);
            }
        });
        convertView.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.txtTitle.setText(Utilities.arrayRSS.get(position).getTitle());
    holder.txtDescription.setText(Utilities.arrayRSS.get(position)
            .getDescription());

    return convertView;
}

答案 1 :(得分:0)

对于列表视图,您使用的是Android提供的SimpleAdapter,但仅当您必须显示名称列表时才有效。如果您希望根据需要自定义列表,例如在每行上添加按钮或图像等,则必须自己制作适配器。
以下是执行此操作的步骤:

  1. 通过扩展BaseAdapter或ArrayAdapter
  2. 编写自定义适配器
  3. 覆盖其方法。
  4.   

    注意:如果您将任何可点击的项目添加到列表视图行,则该项目将是可点击的,但列表将不可点击。因此列表onItemClickListener将不起作用。现在,在这种情况下,为了获得项目的位置,你必须做一些解决方法。我在行项目和getTag()方法上使用setTag()来获取它在组中的位置。

    以下是此示例代码:
    行项目的XML

    <?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="horizontal"
        android:padding="10dp" >
        <TextView 
            android:id="@+id/nameTxt"
            android:layout_width="0dp"
            android:layout_height="50dp"
            android:layout_weight="3"
            />
        <Button 
            android:id="@+id/addBtn"
            android:layout_width="0dp"
            android:layout_height="50dp"
            android:layout_weight="1"
            android:text="Add"
                android:onClick="addFriend"
            />  
    </LinearLayout>
    


    自定义适配器代码

    public class MyListAdapter extends BaseAdapter
    {
        String names[];
        LayoutInflater mInflater;
    
        public MyListAdapter(String _names[],Context context) {
            names = _names;
            mInfalter = LayoutInflater.from(context);
        }
    
        @Override
        public int getCount ( )
        {
            return names.length;
        }
    
        @Override
        public Object getItem (int position)
        {
            return names[position];
        }
    
        @Override
        public long getItemId (int position)
        {
            return position;
        }
    
        @Override
        public View getView (int position, View convertView, ViewGroup parent)
        {
            ViewHolder holder;
            if(convertView == null) {
                holder = new ViewHolder();
                convertView = mInfalter.inflate(R.layout.list_item, null);
                holder.name = (ImageView)convertView.findViewById(R.id.name);
                holder.addBrn = (TextView)convertView.findViewById(R.id.addBtn);
                convertView.setTag(holder);
            }else{
                holder = (ViewHolder)convertView.getTag();
            }
    
            holder.templeName.setText(names[position]);
            holder.addBtn.setTag(Integer.toString(position));
    
            return convertView;
        }
    
        static class ViewHolder {
            TextView name;
            Button addBtn;
        }
    
    }
    


    这是单击添加按钮时调用的方法

    public void addFriend(View v) {
        int position = Integer.parseInt(v.getTag().toString());
        //now you have the position of the button that you can use for your purpose
    }
    


    以下是设置适配器的代码

    //String array of names
     String[] names;
    
     MyListAdapter mAdapter = new MyListAdapter(names,yourActivity.this);
     list.setAdapter(mAdapter);
    
      

    我希望这会有所帮助:)