Android中AutoCompleteTextView的…

将拼音中带有h的自动补全：

思路;1:添加一个AutoCompleteTextView组件

       2:在主程序中设置一个集合（数组），并通过获取组件ID得到一个AutoCompleteTextView组件

       3:通过适配器将数据传入

注意:主要要学会字节编写适配器，设置适合自己的过滤器，这里主要写一下适配器代码，主代码已用蓝色标记

List list = new ArrayList<>();
list.add("北京");

PinyinAdapter adapter = new PinyinAdapter(this, list);
AutoCompleteTextView auto = (AutoCompleteTextView) findViewById(R.id.main_auto);
auto.setAdapter(adapter);      

适配器代码:

public class PinyinAdapter extends BaseAdapter implements Filterable {
    private Context context;
    private List list;
    private List backup;
    private Filter filter;

    public PinyinAdapter(Context context, List list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = new TextView(context);
        }
        ((TextView) convertView).setText(list.get(position));
        return convertView;
    }

    @Override
    public Filter getFilter() {
        if (filter == null) {
            filter = new PinyinFilter();
        }
        return filter;
    }

    private class PinyinFilter extends Filter{

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            if (backup == null) {
                backup = new ArrayList<>(list);
            }
            FilterResults results = new FilterResults();
            if (!TextUtils.isEmpty(constraint)) {
                List strings = new ArrayList<>();
                for (String str : backup) {
                    try {
                        String pinyin = PinyinHelper.convertToPinyinString(str, "", PinyinFormat.WITHOUT_TONE);
                        if (pinyin.contains(constraint)) {
                            strings.add(str);
                        } else {
                            String shortPinyin = PinyinHelper.getShortPinyin(str);
                            if (shortPinyin.startsWith(constraint.toString())) {
                                strings.add(str);
                            }
                        }
                    } catch (PinyinException e) {
                        e.printStackTrace();
                    }
                }
                results.count = strings.size();
                results.values = strings;

            } else {
                results.count = 0;
                results.values = new ArrayList<>();
            }
            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            list.clear();
            list.addAll((Collection