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 ? :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() == ) {
                 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 = ; 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 > ) {
                 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();

 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();
                 }
             });