Android中ListView分类

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    android:orientation = "vertical"
    android:layout_width = "fill_parent"
    android:layout_height = "fill_parent"
    >
    <ListView
        android:id = "@+id/categoryList"
        android:layout_width = "fill_parent"
        android:layout_height = "fill_parent"
        />
</LinearLayout>&nbsp;

分类Title实现：

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android = "http://schemas.android.com/apk/res/android"
    android:layout_width = "match_parent"
    android:layout_height = "match_parent"
    android:minHeight = "30dip"
    android:gravity = "center_vertical"
    android:paddingLeft = "10dip"
    android:background = "@color/title_background_color"
    />&nbsp;

package com.flora;
import android.widget.Adapter;
public class Category {
    private String mTitle;
     
    private Adapter mAdapter;
    public Category(String title, Adapter adapter) {
        mTitle = title;
        mAdapter = adapter;
    }
     
    public void setTile(String title) {
        mTitle = title;
    }
     
    public String getTitle() {
        return mTitle;
    }
     
    public void setAdapter(Adapter adapter) {
        mAdapter = adapter;
    }
     
    public Adapter getAdapter() {
        return mAdapter;
    }
     
}&nbsp;

package com.flora;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class ListViewCategoryActivity extends Activity {
     
    private String [] mContacts = {"马英才", "张三", "李四"};
    private String [] mMusic = {"素顔", "庐州月", "半城烟沙"};
    private String [] mEBook = {"拆掉思维里的墙", "淡定力", "人脉决定命脉"};
     
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
         
        mCategoryAdapter.addCategory("人名", new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mContacts));
         
        mCategoryAdapter.addCategory("音乐",new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mMusic));
         
        mCategoryAdapter.addCategory("书籍",new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, mEBook));
         
        ListView categoryList = (ListView) findViewById(R.id.categoryList);
         
        categoryList.setAdapter(mCategoryAdapter);
    }
     
    private CategoryAdapter mCategoryAdapter = new CategoryAdapter() {
        @Override
        protected View getTitleView(String title, int index, View convertView, ViewGroup parent) {
            TextView titleView;
             
            if (convertView == null) {
                titleView = (TextView)getLayoutInflater().inflate(R.layout.title, null);
            } else {
                titleView = (TextView)convertView;
            }
             
            titleView.setText(title);
             
            return titleView;
        }
    };
     
}

package com.flora;
import java.util.ArrayList;
import java.util.List;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.BaseAdapter;
public abstract class CategoryAdapter extends BaseAdapter {
    private List<Category> categories = new ArrayList<Category>();
     
    public void addCategory(String title, Adapter adapter) {
        categories.add(new Category(title, adapter));
    }
     
    @Override
    public int getCount() {
        int total = 0;
         
        for (Category category : categories) {
            total += category.getAdapter().getCount() + 1;
        }
         
        return total;
    }
    @Override
    public Object getItem(int position) {
        for (Category category : categories) {
            if (position == 0) {
                return category;
            }
             
            int size = category.getAdapter().getCount() + 1;
            if (position < size) {
                return category.getAdapter().getItem(position-1);
            }
            position -= size;
        }
         
        return null;
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
     
    public int getViewTypeCount() {
        int total = 1;
         
        for (Category category : categories) {
            total += category.getAdapter().getViewTypeCount();
        }
         
        return total;
    }
    public int getItemViewType(int position) {
        int typeOffset = 1;
         
        for (Category category : categories) {
            if (position == 0) {
                return 0;
            }
             
            int size = category.getAdapter().getCount() + 1;
            if (position < size) {
                return typeOffset + category.getAdapter().getItemViewType(position - 1);
            }
            position -= size;
             
            typeOffset += category.getAdapter().getViewTypeCount();
        }
         
        return -1;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        int categoryIndex = 0;
         
        for (Category category : categories) {
            if (position == 0) {
                return getTitleView(category.getTitle(), categoryIndex,convertView, parent);
            }
            int size = category.getAdapter().getCount()+1;
            if (position < size) {
                return category.getAdapter().getView(position - 1, convertView, parent);
            }
            position -= size;
             
            categoryIndex++;
        }
         
        return null;
    }
     
    protected abstract View getTitleView(String caption,int index,View convertView,ViewGroup parent);
     
}&nbsp;