AutoCompleteTextView 自定义提示样式

项目中用到AutoCompleteTextView  自动提示功能，如果用自带的ArrayAdapter就一种样式，非常丑，而且每一项提示文字过多的话不会自动换行。

所以自己自定义了一个适配器。

效果图：

1、每一项的布局文件：（可以自己定义）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/text1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:layout_marginLeft="@dimen/dimen_10"
        android:layout_marginRight="@dimen/dimen_10"
        android:layout_marginTop="@dimen/dimen_5"
        android:layout_marginBottom="@dimen/dimen_5"
        android:textSize="@dimen/textsize_14"
        android:lineSpacingExtra="@dimen/dimen_4"
        android:singleLine="false" />

    <View
        android:layout_width="match_parent"
        android:layout_height="@dimen/dimen_2"
        android:background="@color/line_bg"
        android:layout_marginLeft="@dimen/dimen_10"
        android:layout_marginRight="@dimen/dimen_5"/>

</LinearLayout>

这里用android:lineSpacingExtra="@dimen/dimen_4"属性指定了一下行间距。

2、适配器代码如下：

package nari.app.BianDianYingYong.adapter;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

import nari.app.BianDianYingYong.R;

/**
 * Created by weihao on 2018/5/28.
 * 继承BaseAdapter，实现Filterable
 */

public class AutoEditTextAdapter extends BaseAdapter implements Filterable {
    private ArrayFilter mFilter;
    private List<String> mList;
    private Context context;
    private ArrayList<String> mUnfilteredData;

    public AutoEditTextAdapter(List<String> mList, Context context) {
        this.mList = mList;
        this.context = context;
    }

    @Override
    public int getCount() {

        return mList==null ? 0:mList.size();
    }

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

    @Override
    public long getItemId(int position) {

        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view;
        ViewHolder holder;
        if(convertView==null){
            view = View.inflate(context, R.layout.autotext_list_item, null);

            holder = new ViewHolder();
            holder.text1 = (TextView) view.findViewById(R.id.text1);


            view.setTag(holder);
        }else{
            view = convertView;
            holder = (ViewHolder) view.getTag();
        }

        String pc = mList.get(position);

        holder.text1.setText("-- "+pc);


        return view;
    }

    static class ViewHolder{
        public TextView text1;

    }

    @Override
    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new ArrayFilter();
        }
        return mFilter;
    }

    private class ArrayFilter extends Filter {

        @Override
        protected FilterResults performFiltering(CharSequence prefix) {
            FilterResults results = new FilterResults();

            if (mUnfilteredData == null) {
                mUnfilteredData = new ArrayList<String>(mList);
            }

            if (prefix == null || prefix.length() == 0) {
                ArrayList<String> list = mUnfilteredData;
                results.values = list;
                results.count = list.size();
            } else {
                String prefixString = prefix.toString().toLowerCase();

                ArrayList<String> unfilteredValues = mUnfilteredData;
                int count = unfilteredValues.size();

                ArrayList<String> newValues = new ArrayList<String>(count);

                for (int i = 0; i < count; i++) {
                    String pc = unfilteredValues.get(i);
                    if (pc != null) {

                        if(pc!=null && pc.startsWith(prefixString)){

                            newValues.add(pc);
                        }else if(pc!=null && pc.startsWith(prefixString)){

                            newValues.add(pc);
                        }
                    }
                }

                results.values = newValues;
                results.count = newValues.size();
            }

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint,
                                      FilterResults results) {

            mList = (List<String>) results.values;
            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }

    }
}

3、调用：

//获取控件实例
AutoCompleteTextView et_wtms = (AutoCompleteTextView) layout.findViewById(R.id.et_wtms);
//设置输入一个字就自动提示，默认是两个
et_wtms.setThreshold(1);

AutoEditTextAdapter adapter = new AutoEditTextAdapter(key, context);

et_wtms.setAdapter(adapter);

et_wtms.addTextChangedListener(new TextWatcher() {//文字改变事件
                @Override
                public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                   
                }

                @Override
                public void onTextChanged(CharSequence s, int start, int before, int count) {

                }

                @Override
                public void afterTextChanged(Editable s) {
                    
                }
            });

//点击就自动提示
et_wtms.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    et_wtms.showDropDown();
                }
            });