自定义输入框提示功能

这是系统提供的一个控件：AutoCompleteTextView

<AutoCompleteTextView
                android:layout_marginLeft="20dp"
                android:id="@+id/name_edit"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="6"
                android:completionThreshold="1"
                android:textSize="15sp"
                android:maxLength="10"
                android:singleLine="true"
                android:paddingBottom="4dp"
                android:background="@null"
                android:hint="请输入姓名"/>

但是我们想在item的布局中加入其他东西怎么办？这样我们只能自己定义适配器，首先先看看AutoCompleteTextView需要的适配器的类型，
查看AutoCompleteTextView的setAdapter（）方法的源码如下：

public <T extends ListAdapter & Filterable> void setAdapter(T adapter) {
    if (mObserver == null) {
        mObserver = new PopupDataSetObserver(this);
    } else if (mAdapter != null) {
        mAdapter.unregisterDataSetObserver(mObserver);
    }
    mAdapter = adapter;
    if (mAdapter != null) {
        //noinspection unchecked
        mFilter = ((Filterable) mAdapter).getFilter();
        adapter.registerDataSetObserver(mObserver);
    } else {
        mFilter = null;
    }

    mPopup.setAdapter(mAdapter);
}

自定义适配器核心代码：

private PoiKeyTipListAdapter poiKeyTipListAdapter;

poiKeyTipListAdapter = new PoiKeyTipListAdapter(this);
        nameEdit.setAdapter(poiKeyTipListAdapter);
        nameEdit.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) {
                if(nameEdit.getText().toString().length()>1){
                    //根据实际操作请求数据 

                }
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

public class PoiKeyTipListAdapter extends BaseAdapter implements Filterable {
    private List<SendNameBean.DataBean> stringArrayList ;
    private Context context;
    private OnDataChangedListener changedListener;
    public PoiKeyTipListAdapter(Context context) {

        this.context = context;
    }
    public void setData(List<SendNameBean.DataBean> stringArrayList){
        this.stringArrayList = stringArrayList;
        notifyDataSetChanged();
    }
    @Override
    public int getCount() {
        return stringArrayList == null ? 0 : stringArrayList.size();
    }
    @Override
    public Object getItem(int position) {
        return stringArrayList == null ? null : stringArrayList.get(position);
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if (convertView == null){
            convertView = LayoutInflater.from(context).inflate(R.layout.item_input_tip_layout,parent,false);
            viewHolder = new ViewHolder();
            viewHolder.item_txt_tip = (TextView) convertView.findViewById(R.id.item_txt_tip);
            viewHolder.name = (TextView) convertView.findViewById(R.id.name);
            viewHolder.phone = (TextView) convertView.findViewById(R.id.phone);
            convertView.setTag(viewHolder);
        }else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.item_txt_tip.setText(stringArrayList.get(position).getProvinceName()+stringArrayList.get(position).getCityName()+stringArrayList.get(position).getCountyName()+stringArrayList.get(position).getTownName()+stringArrayList.get(position).getAddress());
        viewHolder.name.setText(stringArrayList.get(position).getName());
        viewHolder.phone.setText(stringArrayList.get(position).getPhone());


        convertView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (changedListener != null) {
                    changedListener.dataChangedListener(stringArrayList.get(position));
                }
            }
        });

        return convertView;
    }


    static class  ViewHolder{
        private  TextView item_txt_tip ;
        private  TextView name ;
        private  TextView phone ;
    }



    @Override
    public Filter getFilter() {
        Filter filter=new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();
                ArrayList<SendNameBean.DataBean> newData = new ArrayList<>();
                if(stringArrayList!=null && stringArrayList.size()!=0){
                    newData.addAll(stringArrayList);
                }
                results.values = newData;
                results.count = newData.size();
                return results;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                stringArrayList = (ArrayList)results.values;
                notifyDataSetChanged();
            }
        };
        return filter;
    }



    public interface OnDataChangedListener{
        void dataChangedListener(SendNameBean.DataBean dataBean);
    }


    public void setOnDataChangedListener(OnDataChangedListener changedListener){
        this.changedListener = changedListener;
    }

}

效果图