android AutoCompleteTextView 自定义BaseAdapter

最近项目中需要做搜索功能，实现类似 Google、Baidu 搜索的 下拉提示效果。android为我们提供了 AutoCompleteTextView 控件来完成此功能。

网上好多例子都是简单使用 ArrayAdapter 来实现的，界面比较简单，实际项目中用处不大；自己研究了一番，自定义Adapter 继承BaseAdapter 并实现Filterable 接口 实现了上述功能。

运行效果截图

package com.example.actv;import java.util.ArrayList;import java.util.List;import com.example.actv.entity.PhoneContact;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.AutoCompleteTextView;public class MainActivity extends Activity implements OnItemClickListener {List<PhoneContact> mList;private AutoCompleteTextView mACTV;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);buildAppData();findView();}private void buildAppData() {String[] names = { "abc", "allen", "bird", "bike", "book", "cray","david", "demon", "eclipse", "felling", "frank", "google","green", "hill", "hook","jin zhiwen", "jack", "jay", "king","kevin","kobe","lily", "lucy", "mike", "nike", "nail", "open","open cv","panda", "pp", "queue", "ray allen", "risk", "tim cook","T-MAC","tony allen","x man", "x phone", "yy", "world", "w3c", "zoom","zhu ziqing"};mList = new ArrayList<PhoneContact>();for (int i = 0; i < names.length; i++) {PhoneContact pc = new PhoneContact(100 + i, names[i], "1861234567"+ i, names[i].concat("@gmail.com"));mList.add(pc);}}private void findView() {mACTV = (AutoCompleteTextView) findViewById(R.id.mACTV);PhoneAdapter mAdapter = new PhoneAdapter(mList, getApplicationContext());mACTV.setAdapter(mAdapter);mACTV.setThreshold(1);//设置输入一个字符 提示，默认为2mACTV.setOnItemClickListener(this);}@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;}@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {PhoneContact pc = mList.get(position);mACTV.setText(pc.getName()+" "+pc.getPhone());}}

自定义Adapter

package com.example.actv;import java.util.ArrayList;import java.util.List;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 com.example.actv.entity.PhoneContact;public class PhoneAdapter extends BaseAdapter implements Filterable {private ArrayFilter mFilter;private List<PhoneContact> mList;private Context context;private ArrayList<PhoneContact> mUnfilteredData;public PhoneAdapter(List<PhoneContact> mList, Context context) {this.mList = mList;this.context = context;}@Overridepublic int getCount() {return mList==null ? 0:mList.size();}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn mList.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view;ViewHolder holder;if(convertView==null){view = View.inflate(context, R.layout.phone_item, null);holder = new ViewHolder();holder.tv_name = (TextView) view.findViewById(R.id.tv_name);holder.tv_phone = (TextView) view.findViewById(R.id.tv_phone);holder.tv_email = (TextView) view.findViewById(R.id.tv_email);view.setTag(holder);}else{view = convertView;holder = (ViewHolder) view.getTag();}PhoneContact pc = mList.get(position);holder.tv_name.setText("姓名："+pc.getName());holder.tv_phone.setText("电话："+pc.getPhone());holder.tv_email.setText("Email："+pc.getEmail());return view;}static class ViewHolder{public TextView tv_name;public TextView tv_phone;public TextView tv_email;}@Overridepublic Filter getFilter() {if (mFilter == null) {mFilter = new ArrayFilter();}return mFilter;}private class ArrayFilter extends Filter {@Overrideprotected FilterResults performFiltering(CharSequence prefix) {FilterResults results = new FilterResults();            if (mUnfilteredData == null) {                mUnfilteredData = new ArrayList<PhoneContact>(mList);            }            if (prefix == null || prefix.length() == 0) {                ArrayList<PhoneContact> list = mUnfilteredData;                results.values = list;                results.count = list.size();            } else {                String prefixString = prefix.toString().toLowerCase();                ArrayList<PhoneContact> unfilteredValues = mUnfilteredData;                int count = unfilteredValues.size();                ArrayList<PhoneContact> newValues = new ArrayList<PhoneContact>(count);                for (int i = 0; i < count; i++) {                PhoneContact pc = unfilteredValues.get(i);                    if (pc != null) {                                            if(pc.getName()!=null && pc.getName().startsWith(prefixString)){                                        newValues.add(pc);                    }else if(pc.getEmail()!=null && pc.getEmail().startsWith(prefixString)){                                        newValues.add(pc);                    }                    }                }                results.values = newValues;                results.count = newValues.size();            }            return results;}@Overrideprotected void publishResults(CharSequence constraint,FilterResults results) { //noinspection unchecked            mList = (List<PhoneContact>) results.values;            if (results.count > 0) {                notifyDataSetChanged();            } else {                notifyDataSetInvalidated();            }}}}

注意：一定要实现 Filterable 接口，否则无效

MainActivity 布局文件

<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"    tools:context=".MainActivity" >    <AutoCompleteTextView        android:id="@+id/mACTV"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="" >        <requestFocus />    </AutoCompleteTextView></RelativeLayout>

phone_item.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content" >    <ImageView        android:id="@+id/ivIcon"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:contentDescription="@string/app_name"        android:src="@drawable/ic_launcher" />    <LinearLayout        android:id="@+id/appInfo"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="5dip"        android:layout_toRightOf="@id/ivIcon"        android:orientation="vertical" >        <TextView            android:id="@+id/tv_name"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/person_name"            android:textColor="#000000"            android:textSize="16sp" />        <TextView            android:id="@+id/tv_phone"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/phone"            android:textColor="#666666"            android:textSize="13sp" />        <TextView            android:id="@+id/tv_email"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="@string/email"            android:textColor="#666666"            android:textSize="13sp" />    </LinearLayout>    <Button        android:id="@+id/btnClick"        android:layout_width="80dip"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:layout_centerVertical="true"        android:focusable="false"        android:text="@string/call"        android:textColor="#000000"        android:textSize="16sp" /></RelativeLayout>