Android学习小Demo（12）TodoList实现ListView的分组实现

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- <span class="keyword">public</span> <span class="keyword">class</span> StickListTaskAdapter <span class="keyword">extends</span> BaseAdapter

- <span class="keyword">implements</span> SectionIndexer, StickyListHeadersAdapter{

- 
- <span class="keyword">private</span> LayoutInflater layoutInflater;

- <span class="keyword">private</span> List<TodoTask> tasks;

- <span class="keyword">private</span> <span class="keyword">int</span>[] sectionIndices;

- <span class="keyword">private</span> String[] sectionHeaders;

- 
- <span class="keyword">public</span> StickListTaskAdapter(Context context, List<TodoTask> tasks) {

- layoutInflater = LayoutInflater.from(context);

- 
- <span class="keyword">this</span>.tasks = tasks;

- sectionIndices = getSectionIndices();

- sectionHeaders = getSectionHeaders();

- }

- 
- <span class="keyword">public</span> <span class="keyword">void</span> refresh(List<TodoTask> tasks){

- <span class="keyword">this</span>.tasks = tasks;

- sectionIndices = getSectionIndices();

- sectionHeaders = getSectionHeaders();

- notifyDataSetChanged();

- }

- 
- <span class="keyword">private</span> <span class="keyword">int</span>[] getSectionIndices() {

- List<Integer> sectionIndices = <span class="keyword">new</span> ArrayList<Integer>();

- String lastCreateDate = Helper.getFormatDate(tasks.get(<span class="number"></span>).getCreateTime());

- sectionIndices.add(<span class="number"></span>);

- <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">1</span>; i < tasks.size(); i++) {

- String createDate = Helper.getFormatDate(tasks.get(i).getCreateTime());

- <span class="keyword">if</span> (!createDate.equals(lastCreateDate)) {

- lastCreateDate = createDate;

- sectionIndices.add(i);

- }

- }

- <span class="keyword">int</span>[] sections = <span class="keyword">new</span> <span class="keyword">int</span>[sectionIndices.size()];

- <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number"></span>; i < sectionIndices.size(); i++) {

- sections[i] = sectionIndices.get(i);

- }

- <span class="keyword">return</span> sections;

- }

- 
- <span class="keyword">private</span> String[] getSectionHeaders() {

- String[] sectionHeaders = <span class="keyword">new</span> String[sectionIndices.length];

- <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number"></span>; i < sectionIndices.length; i++) {

- sectionHeaders[i] = Helper.getFormatDate(tasks.get(sectionIndices[i]).getCreateTime());

- }

- <span class="keyword">return</span> sectionHeaders;

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> <span class="keyword">int</span> getCount() {

- <span class="keyword">return</span> tasks.size();

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> Object getItem(<span class="keyword">int</span> position) {

- <span class="keyword">return</span> tasks.get(position);

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> <span class="keyword">long</span> getItemId(<span class="keyword">int</span> position) {

- <span class="keyword">return</span> tasks.get(position).getId();

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> View getView(<span class="keyword">int</span> position, View convertView, ViewGroup parent) {

- ViewHolder viewHolder;

- <span class="keyword">if</span> (convertView == <span class="keyword">null</span>) {

- viewHolder = <span class="keyword">new</span> ViewHolder();

- convertView = layoutInflater.inflate(R.layout.task_item, <span class="keyword">null</span>);

- viewHolder.ivComplete = (ImageView)convertView.findViewById(R.id.ivComplete);

- viewHolder.tvTitle = (TextView) convertView.findViewById(R.id.tvTitle);

- viewHolder.tvCreateTime = (TextView) convertView.findViewById(R.id.tvCreateTime);

- convertView.setTag(viewHolder);

- } <span class="keyword">else</span> {

- viewHolder = (ViewHolder) convertView.getTag();

- }

- <span class="keyword">if</span>(<span class="string">&#8220;Y&#8221;</span>.equals(tasks.get(position).getFlagCompleted())){

- viewHolder.ivComplete.setVisibility(View.VISIBLE);

- viewHolder.tvCreateTime.setText(Helper.getFormatDate(tasks.get(position).getCompleteTime()));

- }<span class="keyword">else</span>{

- viewHolder.ivComplete.setVisibility(View.GONE);

- viewHolder.tvCreateTime.setText(Helper.getFormatDate(tasks.get(position).getCreateTime()));

- }

- viewHolder.tvTitle.setText(tasks.get(position).getTitle());

- 
- <span class="keyword">return</span> convertView;

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> View getHeaderView(<span class="keyword">int</span> position, View convertView, ViewGroup parent) {

- HeaderViewHolder hvh;

- <span class="keyword">if</span>(convertView == <span class="keyword">null</span>){

- hvh = <span class="keyword">new</span> HeaderViewHolder();

- convertView = layoutInflater.inflate(R.layout.task_header, <span class="keyword">null</span>);

- hvh.tvHeader = (TextView) convertView.findViewById(R.id.tvHeader);

- convertView.setTag(hvh);

- }<span class="keyword">else</span>{

- hvh = (HeaderViewHolder)convertView.getTag();

- }

- hvh.tvHeader.setText(Helper.getFormatDate(tasks.get(position).getCreateTime()));

- <span class="keyword">return</span> convertView;

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> <span class="keyword">long</span> getHeaderId(<span class="keyword">int</span> position) {

- <span class="keyword">return</span> Helper.changeStringDateToLong(Helper.getFormatDate(tasks.get(position).getCreateTime()));

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> Object[] getSections() {

- <span class="comment">// TODO Auto-generated method stub</span>

- <span class="keyword">return</span> sectionHeaders;

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> <span class="keyword">int</span> getPositionForSection(<span class="keyword">int</span> sectionIndex) {

- <span class="keyword">if</span> (sectionIndex >= sectionIndices.length) {

- sectionIndex = sectionIndices.length &#8211; <span class="number">1</span>;

- } <span class="keyword">else</span> <span class="keyword">if</span> (sectionIndex < <span class="number"></span>) {

- sectionIndex = <span class="number"></span>;

- }

- <span class="keyword">return</span> sectionIndices[sectionIndex];

- }

- 
- <span class="annotation">@Override</span>

- <span class="keyword">public</span> <span class="keyword">int</span> getSectionForPosition(<span class="keyword">int</span> position) {

- <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number"></span>; i < sectionIndices.length; i++) {

- <span class="keyword">if</span> (position < sectionIndices[i]) {

- <span class="keyword">return</span> i &#8211; <span class="number">1</span>;

- }

- }

- <span class="keyword">return</span> sectionIndices.length &#8211; <span class="number">1</span>;

- }

- 
- <span class="keyword">class</span> ViewHolder {

- ImageView ivComplete;

- TextView tvTitle;

- TextView tvCreateTime;

- }

- 
- <span class="keyword">class</span> HeaderViewHolder{

- TextView tvHeader;

- }

- }