Android开发之ListView实现不同品种分类分隔栏的效果(非ExpandableListView实现）

我们有时候会遇到这么一个情况。就是我在一个ListView里面须要显示的东西事实上是有种类之分的。比方我要分冬天，夏天。秋天。春天，然后在这每一个季节以下再去载入各自的条目数据。

还有，比方我们的通讯录。我们须要按A。B，C这种字母顺序分类然后显示。

这个怎么实现呢？

以下我们不用ExpandableListView。而是仅仅用ListView来实现这一显示效果。

MainActivity.java

package com.xzq.listviewadapter;

import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.widget.ListView;

public class MainActivity extends Activity {

    private String[] string = { "A", "B", "C", "D", "E", "F", "G", "H", "I",
            "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V",
            "W", "X", "Y", "Z" };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);

        ListView listview = (ListView) findViewById(R.id.listview);
        MyCustomAdapter adapter = new MyCustomAdapter(this);

        int size = string.length;
        for (int i = 0; i < size; i++) {
            adapter.addSeparatorItem(string[i]);
            for (int k = 0; k < 5; k++) {
                adapter.addItem("item " + k);
            }
        }
        listview.setAdapter(adapter);
    }
}

MyCustomAdapter.java

package com.xzq.listviewadapter;

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;

public class MyCustomAdapter extends BaseAdapter {

    private static final int TYPE_ITEM = 0;
    private static final int TYPE_SEPARATOR = 1;
    private static final int TYPE_MAX_COUNT = TYPE_SEPARATOR + 1;
    private ArrayList<String> data = new ArrayList<String>();
    private LayoutInflater inflater;
    private TreeSet<Integer> set = new TreeSet<Integer>();

    public MyCustomAdapter(Context context) {
        inflater = LayoutInflater.from(context);
    }

    public void addItem(String item) {
        data.add(item);
    }

    public void addSeparatorItem(String item) {
        data.add(item);
        set.add(data.size() - 1);
    }

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

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

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        int type = getItemViewType(position);
        if (convertView == null) {
            holder = new ViewHolder();
            switch (type) {
            case TYPE_ITEM:
                convertView = inflater.inflate(R.layout.item1, null);
                holder.textView = (TextView) convertView
                        .findViewById(R.id.item1);
                break;
            case TYPE_SEPARATOR:
                convertView = inflater.inflate(R.layout.item2, null);
                holder.textView = (TextView) convertView
                        .findViewById(R.id.item2);
                break;
            }
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.textView.setText(data.get(position));
        return convertView;
    }

    public static class ViewHolder {
        public TextView textView;
    }
}

main.xml

<?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="fill_parent"
    android:background="#ffffff"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

</LinearLayout>

item1.xml

<?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="fill_parent"
    android:background="#ffffff"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/item1"
        android:layout_width="fill_parent"
        android:layout_height="30dip"
        android:gravity="center_vertical" />

</LinearLayout>

item2.xml

<?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="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/item2"
        android:layout_width="fill_parent"
        android:layout_height="30dip"
        android:background="#3c4857"
        android:gravity="center_vertical" />

</LinearLayout>