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;  

    @Override
    protected 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2  

        mACTV.setOnItemClickListener(this);
    }  

    @Override
    public 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;
    }  

    @Override
    public 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;
    }  

    @Override
    public int getCount() {  

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

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        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.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;
    }  

    @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<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;
        }  

        @Override
        protected 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>