AutoCompleteTextView 自定义adapter。 可以添加List<Map<String,Object>>

网上的AutoCompleteTextView 基本都是 List<String>   adapter。基于此实现了 自定义的adapter.

其实使用AutoCompleteTextView就得实现过滤器Filterable，你得告诉它怎么过滤。由于ArrayAdapter已经帮我们实现了Filterable接口，所以我们很容易忽略这个，以为AutoCompleteTextView用起来很简单。如果你使用的是BaseAdapter呢？当然，事实上也不难，只要让它也实现Filterable接口就可以了。

过程：

1. 定义一个autocompletetextview。然后定义一个要显示下拉item的布局文件。
2. 自定义adapter. 我们需要继承BaseAdapter，同时需要实现过滤器ArrayListFilter。 baseAdapter 跟普通的列表操作基本一致。需要显示的数据为数据源。ArrayListFilter中，我们需要自己去过滤数据源。这一部分读者可能会觉得很难，其实就看你自己的需求了。一般的只要利用String.contains就可以解决了。当然有时候我们会需要同时检索2列，如本例所示。
3. 基本完成了。代码其实非常简单。只要是熟悉了ListView就非常容易解决。

首先，定义布局文件 activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/hello_world" />    <AutoCompleteTextView        android:id="@+id/autoCompleteTextView1"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/multiAutoCompleteTextView1"        android:layout_marginTop="54dp"        android:ems="10"         /></RelativeLayout>

自定义下拉列表的list_item_for_autocomplete.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/linear"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal" >    <TextView        android:id="@+id/code"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="股票代码"         android:layout_weight="1"/>    <TextView        android:id="@+id/name"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="股票名称"         android:layout_weight="1"/>    <Button        android:id="@+id/button"        style="?android:attr/buttonStyleSmall"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="关注"         android:background="#000000"        /></LinearLayout>

自定义adapter.

package com.test.aotuedit;import java.util.ArrayList;import java.util.Map;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.Filter;import android.widget.Filterable;import android.widget.TextView;public class AutoCompleteAdapter extends BaseAdapter implements Filterable {//private Context context;private ArrayList<Map<String, Object>> or_arraylist ;// 原始数据private ArrayList<Map<String, Object>> new_arraylist;// 过滤后的数据private int maxMatch = 10;// 最大显示的数据条数private ArrayListFilter mFilter;private final Object mLock = new Object();private int count=0;// 构造器public AutoCompleteAdapter(Context context,ArrayList<Map<String, Object>> or_arraylist, int maxMatch) {// TODO Auto-generated constructor stubthis.context = context;this.or_arraylist = or_arraylist;this.maxMatch = maxMatch;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn new_arraylist.size();}@Overridepublic Object getItem(int arg0) {// TODO Auto-generated method stubreturn new_arraylist.get(arg0);}@Overridepublic long getItemId(int arg0) {// TODO Auto-generated method stubreturn arg0;}@Overridepublic View getView(final int arg0, View arg1, ViewGroup arg2) {// TODO Auto-generated method stubViewHolder holder = null;if (arg1 == null) {holder = new ViewHolder();LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);arg1 = inflater.inflate(R.layout.list_item_for_autocomplete, null);holder.code = (TextView) arg1.findViewById(R.id.code);holder.name = (TextView) arg1.findViewById(R.id.name);holder.button = (Button) arg1.findViewById(R.id.button);arg1.setTag(holder);} else {holder = (ViewHolder) arg1.getTag();}// 设置显示的内容holder.code.setText(new_arraylist.get(arg0).get("code").toString());holder.name.setText(new_arraylist.get(arg0).get("name").toString());if (new_arraylist.get(arg0).get("flag") instanceof Boolean) {boolean flag = (Boolean) new_arraylist.get(arg0).get("flag");if (flag == true) {holder.button.setText("已关注");holder.button.setClickable(false);} else {holder.button.setText("关注");}}holder.button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stub// 此处需要更新数据库，新建进程更新数据库new_arraylist.get(arg0).put("flag", true);notifyDataSetChanged();}});return arg1;}@Overridepublic Filter getFilter() {// TODO Auto-generated method stubif (mFilter == null) {mFilter = new ArrayListFilter();}return mFilter;}class ViewHolder {TextView code;TextView name;Button button;}public ArrayList<Map<String, Object>> getAllItems() {return or_arraylist;}// 新建的自定义的过滤器private class ArrayListFilter extends Filter {@Overrideprotected FilterResults performFiltering(CharSequence prefix) {// TODO Auto-generated method stubFilterResults results = new FilterResults();if(or_arraylist==null){System.out.println("--->>>");}//如果没有输入，那么显示所有if (prefix == null || prefix.length() == 0) {synchronized (mLock) {ArrayList<Map<String, Object>> list = new ArrayList<Map<String, Object>>(or_arraylist);results.values = list;results.count = list.size();return results;}} else { String prefixString = prefix.toString().toLowerCase();                        final int count = or_arraylist.size();                        final ArrayList<Map<String, Object>> newValues =new ArrayList<Map<String,Object>>(count);                        for (int i = 0; i < count; i++) {                      final String code = or_arraylist.get(i).get("code").toString();                        final String codeText = code.toLowerCase();                     final String name = or_arraylist.get(i).get("name").toString();                        final String nameText = name.toLowerCase();                         if (codeText.contains(prefixString)||nameText.contains(prefixString)) {  //源码 ,匹配开头                             newValues.add(or_arraylist.get(i));                           System.out.println("--->>>"+or_arraylist.get(i).get("code").toString()+prefixString+codeText);                    }                                      if(maxMatch>0){//有数量限制                            if(newValues.size()>maxMatch-1){//不要太多                                break;                            }                        }                    }                        results.values = newValues;                    results.count = newValues.size();                }                return results;  }@Overrideprotected void publishResults(CharSequence arg0, FilterResults results) {// TODO Auto-generated method stubnew_arraylist = (ArrayList<Map<String, Object>>) results.values;                if (results.count > 0) {                    notifyDataSetChanged();                } else {                    notifyDataSetInvalidated();                }  }}}

活动

package com.test.aotuedit;import java.util.ArrayList;import java.util.HashMap;import java.util.Map;import java.util.Random;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.widget.AutoCompleteTextView;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);AutoCompleteTextView tv=(AutoCompleteTextView)findViewById(R.id.autoCompleteTextView1);AutoCompleteAdapter adapter=new AutoCompleteAdapter(getApplicationContext(), getdata(), 10);tv.setAdapter(adapter);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}public ArrayList<Map<String,Object>> getdata(){//读取数据库的原始资料int len=10;ArrayList<Map<String,Object>> list=new ArrayList<Map<String,Object>>(len);for(int i=0;i<len;i++){Map<String,Object>map=new HashMap<String, Object>();map.put("code", "000"+i);map.put("name", "股票"+i);Random rand = new Random();int number = rand.nextInt(30);if(number%4==0){map.put("flag",false );}else{map.put("flag", true);}list.add(map);}//返回显示的数据return list;}}