android聯系人帶字母檢索源碼

/**
 * 聯系人列表適配器。
 * 
 * @author guolin
 */
public class ContactAdapter extends ArrayAdapter<Contact> {

	/**
	 * 需要渲染的item布局文件
	 */
	private int resource;

	/**
	 * 字母表分組工具
	 */
	private SectionIndexer mIndexer;

	public ContactAdapter(Context context, int textViewResourceId, List<Contact> objects) {
		super(context, textViewResourceId, objects);
		resource = textViewResourceId;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		Contact contact = getItem(position);
		LinearLayout layout = null;
		if (convertView == null) {
			layout = (LinearLayout) LayoutInflater.from(getContext()).inflate(resource, null);
		} else {
			layout = (LinearLayout) convertView;
		}
		TextView name = (TextView) layout.findViewById(R.id.name);
		LinearLayout sortKeyLayout = (LinearLayout) layout.findViewById(R.id.sort_key_layout);
		TextView sortKey = (TextView) layout.findViewById(R.id.sort_key);
		name.setText(contact.getName());
		int section = mIndexer.getSectionForPosition(position);
		if (position == mIndexer.getPositionForSection(section)) {
			sortKey.setText(contact.getSortKey());
			sortKeyLayout.setVisibility(View.VISIBLE);
		} else {
			sortKeyLayout.setVisibility(View.GONE);
		}
		return layout;
	}

	/**
	 * 給當前適配器傳入一個分組工具。
	 * 
	 * @param indexer
	 */
	public void setIndexer(SectionIndexer indexer) {
		mIndexer = indexer;
	}

}