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 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();
		
		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 mList;
	private Context context;
	private ArrayList mUnfilteredData;
	
	public PhoneAdapter(List 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(mList);
            }

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

                ArrayList unfilteredValues = mUnfilteredData;
                int count = unfilteredValues.size();

                ArrayList newValues = new ArrayList(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) 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

phone_item.xml