Android ListView分类/分组效果 - 第二种实现方式（转）

[java] view plaincopyprint?
public int getItemViewType (int position)  
  
获取通过getView为指定项目创建的视图的类型。  
参数  
    position 在adapter数据里我们想知道视图类型的项目的位置  
返回值  
    一个整形的视图类型的描述。如果一个视图通过getView(int, View, ViewGroup)方法转换成另一个视图，则两个视图将共享同一类型。注意：整形必须在0和getViewTypeCount()– 1之间。IGNORE_ITEM_VIEW_TYPE也可以返回。  
  
  
public int getViewTypeCount ()  
  
返回通过getView(int, View, ViewGroup))创建的视图的类型数量。每一个类型表示一组通过getView(int, View, ViewGroup)方法转换过的视图。如果adapter针对所有项目返回相同的视图类型，这个方法返回1。这个方法仅仅当adapter设置在AdapterView时调用。  
  
返回值  
通过这个adapter创建的视图类型的数量  

[java] view plaincopyprint?
public class MainActivity extends Activity {  
  
    private CategoryAdapter mCustomBaseAdapter;  
  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
          
        ListView listView = (ListView) findViewById(R.id.listView1);  
          
        // 数据  
        ArrayList<Category> listData = getData();  
          
        mCustomBaseAdapter = new CategoryAdapter(getBaseContext(), listData);  
          
        // 适配器与ListView绑定  
        listView.setAdapter(mCustomBaseAdapter);  
          
        listView.setOnItemClickListener(new ItemClickListener());  
    }  
  
      
    private class ItemClickListener implements OnItemClickListener {  
  
        @Override  
        public void onItemClick(AdapterView<?> parent, View view, int position,  
                long id) {  
            Toast.makeText(getBaseContext(),  (String)mCustomBaseAdapter.getItem(position),  
                    Toast.LENGTH_SHORT).show();  
        }  
          
    }  
      
      
    /** 
     * 创建测试数据 
     */  
    private ArrayList<Category> getData() {  
        ArrayList<Category> listData = new ArrayList<Category>();  
        Category categoryOne = new Category("路人甲");  
        categoryOne.addItem("马三立");  
        categoryOne.addItem("赵本山");  
        categoryOne.addItem("郭德纲");  
        categoryOne.addItem("周立波");  
        Category categoryTwo = new Category("事件乙");  
        categoryTwo.addItem("**贪污");  
        categoryTwo.addItem("**照门");  
        Category categoryThree = new Category("书籍丙");  
        categoryThree.addItem("10天学会***");  
        categoryThree.addItem("**大全");  
        categoryThree.addItem("**秘籍");  
        categoryThree.addItem("**宝典");  
        categoryThree.addItem("10天学会***");  
        categoryThree.addItem("10天学会***");  
        categoryThree.addItem("10天学会***");  
        categoryThree.addItem("10天学会***");  
        Category categoryFour = new Category("书籍丙");  
        categoryFour.addItem("河南");  
        categoryFour.addItem("天津");  
        categoryFour.addItem("北京");  
        categoryFour.addItem("上海");  
        categoryFour.addItem("广州");  
        categoryFour.addItem("湖北");  
        categoryFour.addItem("重庆");  
        categoryFour.addItem("山东");  
        categoryFour.addItem("陕西");  
          
        listData.add(categoryOne);  
        listData.add(categoryTwo);  
        listData.add(categoryThree);  
        listData.add(categoryFour);  
          
        return listData;  
    }  
  
      
      
}  

[java] view plaincopyprint?
public class CategoryAdapter extends BaseAdapter {  
  
    private static final int TYPE_CATEGORY_ITEM = 0;  
    private static final int TYPE_ITEM = 1;  
      
    private ArrayList<Category> mListData;  
    private LayoutInflater mInflater;  
      
      
    public CategoryAdapter(Context context, ArrayList<Category> pData) {  
        mListData = pData;  
        mInflater = LayoutInflater.from(context);  
    }  
  
    @Override  
    public int getCount() {  
        int count = 0;  
          
        if (null != mListData) {  
            //  所有分类中item的总和是ListVIew  Item的总个数  
            for (Category category : mListData) {  
                count += category.getItemCount();  
            }  
        }  
          
        return count;  
    }  
  
    @Override  
    public Object getItem(int position) {  
          
        // 异常情况处理  
        if (null == mListData || position <  0|| position > getCount()) {  
            return null;   
        }  
          
        // 同一分类内，第一个元素的索引值  
        int categroyFirstIndex = 0;  
          
        for (Category category : mListData) {  
            int size = category.getItemCount();  
            // 在当前分类中的索引值  
            int categoryIndex = position - categroyFirstIndex;  
            // item在当前分类内  
            if (categoryIndex < size) {  
                return  category.getItem( categoryIndex );  
            }  
              
            // 索引移动到当前分类结尾，即下一个分类第一个元素索引  
            categroyFirstIndex += size;  
        }  
          
        return null;  
    }  
  
    @Override  
    public int getItemViewType(int position) {  
        // 异常情况处理  
        if (null == mListData || position <  0|| position > getCount()) {  
            return TYPE_ITEM;   
        }  
          
          
        int categroyFirstIndex = 0;  
          
        for (Category category : mListData) {  
            int size = category.getItemCount();  
            // 在当前分类中的索引值  
            int categoryIndex = position - categroyFirstIndex;  
            if (categoryIndex == 0) {  
                return TYPE_CATEGORY_ITEM;  
            }  
              
            categroyFirstIndex += size;  
        }  
          
        return TYPE_ITEM;  
    }  
      
    @Override  
    public int getViewTypeCount() {  
        return 2;  
    }  
      
    @Override  
    public long getItemId(int position) {  
        return position;  
    }  
  
    @Override  
    public View getView(int position, View convertView, ViewGroup parent) {  
  
        int itemViewType = getItemViewType(position);  
        switch (itemViewType) {  
        case TYPE_CATEGORY_ITEM:  
            if (null == convertView) {  
                convertView = mInflater.inflate(R.layout.listview_item_header, null);  
            }  
              
            TextView textView = (TextView) convertView.findViewById(R.id.header);  
            String  itemValue = (String) getItem(position);  
            textView.setText( itemValue );  
            break;  
  
        case TYPE_ITEM:  
            ViewHolder viewHolder = null;  
            if (null == convertView) {  
                  
                convertView = mInflater.inflate(R.layout.listview_item, null);  
                  
                viewHolder = new ViewHolder();  
                viewHolder.content = (TextView) convertView.findViewById(R.id.content);  
                viewHolder.contentIcon = (ImageView) convertView.findViewById(R.id.content_icon);  
                convertView.setTag(viewHolder);  
            } else {  
                viewHolder = (ViewHolder) convertView.getTag();  
            }  
              
             // 绑定数据  
            viewHolder.content.setText( (String)getItem(position) );  
            viewHolder.contentIcon.setImageResource(R.drawable.ic_launcher);  
            break;  
        }  
  
        return convertView;  
    }  
  
      
    @Override  
    public boolean areAllItemsEnabled() {  
        return false;  
    }  
      
    @Override  
    public boolean isEnabled(int position) {  
        return getItemViewType(position) != TYPE_CATEGORY_ITEM;  
    }  
      
      
    private class ViewHolder {  
        TextView content;  
        ImageView contentIcon;  
    }  
      
}  

[java] view plaincopyprint?
public class Category {  
  
    private String mCategoryName;  
    private List<String> mCategoryItem = new ArrayList<String>();  
  
    public Category(String mCategroyName) {  
        mCategoryName = mCategroyName;  
    }  
      
    public String getmCategoryName() {  
        return mCategoryName;  
    }  
  
    public void addItem(String pItemName) {  
        mCategoryItem.add(pItemName);  
    }  
      
    /** 
     *  获取Item内容 
     *  
     * @param pPosition 
     * @return 
     */  
    public String getItem(int pPosition) {  
        // Category排在第一位  
        if (pPosition == 0) {  
            return mCategoryName;  
        } else {  
            return mCategoryItem.get(pPosition - 1);  
        }  
    }  
      
    /** 
     * 当前类别Item总数。Category也需要占用一个Item 
     * @return  
     */  
    public int getItemCount() {  
        return mCategoryItem.size() + 1;  
    }  
      
}