使用StickyListHeadersListView开源库

 1 private class MyAdapter extends BaseAdapter implements StickyListHeadersAdapter{
 2 
 3         private String[] mCountries;
 4         private LayoutInflater mInflater;
 5 
 6         public MyAdapter(Context context) {
 7             mInflater = LayoutInflater.from(context);
 8             mCountries = context.getResources().getStringArray(R.array.countries);
 9         }
10         @Override
11         public View getHeaderView(int i, View view, ViewGroup viewGroup) {
12             Log.i("TAG","get HeaderView "+i);
13             HeaderViewHolder holder;
14 
15             if (view == null) {
16                 holder = new HeaderViewHolder();
17                 view = mInflater.inflate(R.layout.header, viewGroup, false);
18                 holder.text = (TextView) view.findViewById(R.id.text1);
19                 view.setTag(holder);
20             } else {
21                 holder = (HeaderViewHolder) view.getTag();
22             }
23 
24             // set header text as first char in name
25             CharSequence headerChar = mCountries[i].subSequence(0, 1);
26             holder.text.setText(headerChar);
27 
28             return view;
29         }
30 
31         /**
32          * 这个是用来边标记浮动headerView的一个方法，返回相同ID的将被显示为同一View
33          * @param i 当前位置
34          * @return 返回唯一ID
35          */
36         @Override
37         public long getHeaderId(int i) {
38             Log.i("TAG","get Header ID "+i +" char at "+mCountries[i].subSequence(0, 1).charAt(0));
39             return mCountries[i].subSequence(0, 1).charAt(0);
40         }
41 
42         @Override
43         public int getCount() {
44             return mCountries.length;
45         }
46 
47         @Override
48         public Object getItem(int position) {
49             return mCountries[position];
50         }
51 
52         @Override
53         public long getItemId(int position) {
54             return position;
55         }
56 
57         @Override
58         public View getView(int position, View convertView, ViewGroup parent) {
59             Log.i("TAG","get View "+ position);
60             ViewHolder holder;
61 
62             if (convertView == null) {
63                 holder = new ViewHolder();
64                 convertView = mInflater.inflate(android.R.layout.simple_expandable_list_item_1, parent, false);
65                 holder.text = (TextView) convertView.findViewById(android.R.id.text1);
66                 convertView.setTag(holder);
67             } else {
68                 holder = (ViewHolder) convertView.getTag();
69             }
70 
71             holder.text.setText(mCountries[position]);
72 
73             return convertView;
74         }
75 
76         class HeaderViewHolder {
77             TextView text;
78         }
79 
80         class ViewHolder {
81             TextView text;
82         }
83     }