Question

新手问题

我有一个json文件，其中包含多个具有相同名称的类别。

例如

{"long_description":"test",
 "short_description":"test",
 "category_name":"work",
 "id":1},
{"long_description":"test2",
 "short_description":"test2",
 "category_name":"work",
 "id":2},
{"long_description":"test",
 "short_description":"test",
 "category_name":"home",
 "id":3}

我的问题是如何使用部分创建列表视图（类别名称）我正在使用自定义适配器继承我的循环

try {

    JSONObject responseObject = new JSONObject(response);
    JSONObject itemsObject = responseObject.getJSONObject("items");


    Iterator<?> keysIterator = itemsObject.keys();

    while(keysIterator.hasNext()) {
         String keyString = (String)keysIterator.next();
         JSONObject coupon = couponsObject.getJSONObject(keyString);

         Item item = new Item();
         item.setLongDescription(item.getString("long_description"));
         itemList.add(item);
     }

} catch (Exception e) {
    e.printStackTrace();
}

adapter.notifyDataSetChanged();

Answer 1

使用下面链接listview的非常好的示例。

http://applidium.github.io/HeaderListView/

http://javatechig.com/android/listview-with-section-header-in-android

http://sunil-android.blogspot.in/2013/08/section-header-listview-in-android.html

在下面给出的代码中只更新数据与你的标题和列表项这个例子是最简单的

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="#2F2F2F"
    android:gravity="center_vertical" >

    <TextView
        android:id="@+id/textSeparator"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:padding="8dp"
        android:text=""
        android:textAllCaps="true"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="#FFF"
        android:textStyle="bold"
        android:visibility="visible" />

</LinearLayout>

CustomAdapter.java

import java.util.ArrayList;
import java.util.TreeSet;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

class CustomAdapter extends BaseAdapter {

    private static final int TYPE_ITEM = 0;
    private static final int TYPE_SEPARATOR = 1;

    private ArrayList<String> mData = new ArrayList<String>();
    private TreeSet<Integer> sectionHeader = new TreeSet<Integer>();

    private LayoutInflater mInflater;

    public CustomAdapter(Context context) {
        mInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public void addItem(final String item) {
        mData.add(item);
        notifyDataSetChanged();
    }

    public void addSectionHeaderItem(final String item) {
        mData.add(item);
        sectionHeader.add(mData.size() - 1);
        notifyDataSetChanged();
    }

    @Override
    public int getItemViewType(int position) {
        return sectionHeader.contains(position) ? TYPE_SEPARATOR : TYPE_ITEM;
    }

    @Override
    public int getViewTypeCount() {
        return 2;
    }

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

    @Override
    public String getItem(int position) {
        return mData.get(position);
    }

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

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        int rowType = getItemViewType(position);

        if (convertView == null) {
            holder = new ViewHolder();
            switch (rowType) {
            case TYPE_ITEM:
                convertView = mInflater.inflate(R.layout.snippet_item1, null);
                holder.textView = (TextView) convertView.findViewById(R.id.text);
                break;
            case TYPE_SEPARATOR:
                convertView = mInflater.inflate(R.layout.snippet_item2, null);
                holder.textView = (TextView) convertView.findViewById(R.id.textSeparator);
                break;
            }
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.textView.setText(mData.get(position));

        return convertView;
    }

    public static class ViewHolder {
        public TextView textView;
    }

}

SectionListView.java

import android.app.ListActivity;
import android.os.Bundle;

public class SectionListView extends ListActivity {

    private CustomAdapter mAdapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAdapter = new CustomAdapter(this);
        for (int i = 1; i < 30; i++) {
            mAdapter.addItem("Row Item #" + i);
            if (i % 4 == 0) {
                mAdapter.addSectionHeaderItem("Section #" + i);
            }
        }
        setListAdapter(mAdapter);
    }

}

自定义列表视图与节标题

1 个答案: