Android ListView筛选器不工作

Question

有人能帮我用自定义适配器过滤列表吗？我已经用了一段时间了。。我遵循了logcat，它确实输出了过滤后的结果。我的问题是用过滤后的效果更新列表视图。

   // list of data items
      private static List<ListData> mDataList = Arrays.asList(
        new ListData("Apple"),
        new ListData("Banana"),
        new ListData("Caramel"),
        new ListData("Dog"),
        new ListData("Cat"),
        new ListData("Snake"),
        new ListData("Lion"),
        new ListData("Zebra"),
        new ListData("Ant"),
        new ListData("Bee"),
        new ListData("Bird"),
        new ListData("Leopard"),
        new ListData("Flamingo"),
        new ListData("Tusk"),
        new ListData("Elephant"),
        new ListData("Chicken")
);
SampleAdapter work = new SampleAdapter();
private Button btnoe;
private AutoCompleteTextView aoe;
    private TextView txtHistory, ao;
            private ListView lv;
        private String[] places;
        private String p = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_search);
    final EditText e = (EditText) findViewById(R.id.edt_search);
    // init the list view and its adapter
    final ListView lv = (ListView) findViewById(R.id.listView);
    lv.setAdapter(work);

    lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            e.setText("" + mDataList.get(position).data);
        }
    });
    //setFields();
    e.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            work.getFilter().filter(s.toString());
        }
        @Override
        public void afterTextChanged(Editable s) {
        }
    });
}

private static class ListData {
    private String data;
    public ListData(String data) {
        this.data = data;
    }
}
private class SampleAdapter extends BaseAdapter implements Filterable {
    private List<String> filtered = null;
    private ItemFilter mFilter = new ItemFilter();

    @Override
    public int getCount() {
        return mDataList.size();
    }
    @Override
    public ListData getItem(int position) {
        return mDataList.get(position);
    }
    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public Filter getFilter() {
        return mFilter;
    }
    private class ItemFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            String filterString = constraint.toString().toLowerCase();
            FilterResults results = new FilterResults();
            final List<ListData> list = mDataList;
            int count = list.size();
            final List<String> nlist = new ArrayList<>(count);
            String FilterableString;
            for (int i = 0; i < count; i++) {
                FilterableString = list.get(i).data;
                if (FilterableString.toLowerCase().contains(filterString)) {
                    mDataList.contains(FilterableString);
                    Log.d("mDataList", ""+mDataList.get(i).data);
                    nlist.add(FilterableString);
                }
            }
            results.values = nlist;
            results.count = nlist.size();
            return results;
        }
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            filtered = (ArrayList<String>) results.values;
            notifyDataSetChanged();
        }
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        int pos = 0;
        String s = "";
        if (convertView == null) {
            convertView = View.inflate(ListActivity.this, R.layout.sample_list_item, null);
            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        ListData item = getItem(position);
        s = item.data.substring(0, 1);
        holder.textView.setText(item.data);
        for (pos = 0; pos > mDataList.size(); pos++) {
            s = mDataList.get(pos).data.substring(0, 1);
        }
   convertView.findViewById(R.id.imageView);
        return convertView;
    }

}
private class ViewHolder {
    private View view;
    private ImageView imageView, checkIcon;
    private TextView textView;
    private ViewHolder(View view) {
        this.view = view;
        imageView = (ImageView) view.findViewById(R.id.imageView);
        textView = (TextView) view.findViewById(R.id.textView);
        checkIcon = (ImageView) view.findViewById(R.id.check_icon);
    }
}

}

Answer 1

对象work是您的ArrayAdapter，但它不会将数据传递到SampleAdapter上。示例代码（类似于我的）如下：

SampleAdapter work = null;
lvAdapter = new SampleAdapter(getActivity(), R.layout.list_item, mDataList);
lv.setAdapter(work);

基本上，您需要将数据从构造函数传递到Adapter子类。另外，SampleAdapter需要getView方法的布局ID（XML）。

玩得开心。。。