1.使用AutoCompleteTextView完成搜索提示自动补全功能，多数教程是使用默认ArrayAdapter,但是定制性不高，下面说说自定义的adapter,以下是代码：

    //实现过滤 重写过滤条件
    private List<CompanyBean.DataBean> datas;
    private List<CompanyBean.DataBean> Unfilterdatas;//未进行过滤的数据

    public ChannelCompanyAdapter(List<CompanyBean.DataBean> datas) {
        this.datas = datas;
        Unfilterdatas = datas;
    }

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

    @Override
    public CompanyBean.DataBean getItem(int position) {
        return datas.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Vholder vholder = null;
        if (convertView == null) {
            vholder = new Vholder();
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.textview_auto, parent, false);
            vholder.tv = convertView.findViewById(R.id.tv);
            convertView.setTag(vholder);
        } else {
            vholder = (Vholder) convertView.getTag();
        }

        vholder.tv.setText(getItem(position).getUsername());
        return convertView;
    }

    @Override
    public Filter getFilter() {
        return new MyFilter();
    }

    class Vholder {
        private TextView tv;
    }

    class MyFilter extends Filter {
        //核心过滤

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            //文本框内容开始筛选
            FilterResults filterResults = new FilterResults();//过滤结果对象 values值 count大小
            if (Unfilterdatas.size() == 0) {
                return null;
            }
            if (constraint == null || constraint.length() == 0) {
         //未输入东西默认所有展示 可更具需求设定
                filterResults.values = Unfilterdatas;
                filterResults.count = Unfilterdatas.size();
            } else {
                String s = constraint.toString().toLowerCase();
                ArrayList<CompanyBean.DataBean> newDatas = new ArrayList<>();
                for (CompanyBean.DataBean dataBean : Unfilterdatas) {
                    if (dataBean.getUsername().contains(s)) {
          //此处是业务需求所有未过滤数据中筛选出包含输入的内容  可根据场景修改
                        newDatas.add(dataBean);
                    }
                }
                if (newDatas.size() == 0) {
           //筛选结果没有展示所有数据
                    filterResults.values = Unfilterdatas;
                    filterResults.count = Unfilterdatas.size();
                } else {
           //设置筛选结果数据
                    filterResults.values = newDatas;
                    filterResults.count = newDatas.size();
                }
            }
            return filterResults;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            //给适配器数据刷新
         if(results!=null){
           //修改适配器数据
            datas = (ArrayList<CompanyBean.DataBean>) results.values;
          }
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    }
}

2.如果展示出来的列表跑到控件上方则是因为软键盘的影响，所以需要设置

android:windowSoftInputMode="adjustPan|adjustResize

调整一下就完毕