edittext 监听内容变化

给EditText追加ChangedListener可以监听EditText内容变化的监听
如图是效果图类似于过滤的一种实现
1 布局也就是一个EditText，当EditText内容发生变化时（当输入数字时）就会出现一个PopupWindow通过ChangedListener来显示监听
2 数据是进入这个页面就加载出来的，当输入的内容变化时，通过遍历改变
3 字体颜色的变化http://www.cnblogs.com/sinber/archive/2011/10/27/2227012.html
Demo下载地址：http://download.csdn.net/detail/qq_29774291/9728733
如下是主要代码：
package com.item.demo;

import java.util.ArrayList;

import java.util.List;

import android.os.Bundle;

import android.text.Editable;

import android.text.SpannableString;

import android.text.Spanned;

import android.text.TextWatcher;

import android.text.style.ForegroundColorSpan;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.EditText;

import android.widget.LinearLayout.LayoutParams;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.PopupWindow;

import android.widget.TextView;

import android.app.Activity;

import android.content.Context;

import android.graphics.Color;

import android.graphics.drawable.ColorDrawable;

/**

 * EditText的一个Demo 实现EditText + PopupWindow来实现搜索的功能

 *

 * @author Administrator

 *

 */

public class MainActivity extends Activity {

    private PopupWindow popupWindow;

    private ListView lView;

    private MyAdapter adapter;

    private EditText edtText;

    private List<String> list = new ArrayList<String>();

    private List<SpannableString> carNumber = new ArrayList<SpannableString>();

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        edtText = (EditText) findViewById(R.id.edt_hello);

        initData();

        adapter = new MyAdapter(this, carNumber);

        edtText.addTextChangedListener(new TextWatcher() {

            @Override

            public void onTextChanged(CharSequence s, int arg1, int arg2, int arg3) {

                // TODO Auto-generated method stub

                if(s.length() > 0){

                    if(popupWindow == null){

                        View contentView = View.inflate(MainActivity.this, R.layout.item_list, null);

                        lView = (ListView)contentView.findViewById(R.id.item_list);

                        popupWindow = new PopupWindow(contentView,edtText.getWidth(),LayoutParams.WRAP_CONTENT,true);

                    }

                    carNumber.clear();

                    for(String str : list){

                        if(str.startsWith("" + s)){

                            SpannableString ss = new SpannableString(str);

                            ss.setSpan(new ForegroundColorSpan(Color.BLUE), 0, s.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

                            carNumber.add(ss);

                        }

                    }

                    if(carNumber.size() == 0){

                        SpannableString ssString = new SpannableString("无该车牌号");

                        ssString.setSpan(new ForegroundColorSpan(Color.RED), 0, ssString.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

                        carNumber.add(ssString);

                    }

                    adapter.notifyDataSetChanged();

                    lView.setAdapter(adapter);

                    popupWindow.setOutsideTouchable(true);

                    popupWindow.setFocusable(false);

                    popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

                    popupWindow.showAsDropDown(edtText, 0, 0);

                    if(carNumber.size() >=5){

                        popupWindow.update(edtText.getWidth(), 250);

                    }else {

                        popupWindow.update(edtText.getWidth(), LayoutParams.WRAP_CONTENT);

                    }

                    lView.setOnItemClickListener(new OnItemClickListener() {

                        @Override

                        public void onItemClick(AdapterView<?> arg0, View arg1,

                                int arg2, long arg3) {

                            // TODO Auto-generated method stub

                            edtText.setText(carNumber.get(arg2).toString());

                            if(popupWindow !=null && popupWindow.isShowing()){

                                popupWindow.dismiss();

                            }

                        }

                    });

                }

            }

            @Override

            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,

                    int arg3) {

                // TODO Auto-generated method stub

            }

            @Override

            public void afterTextChanged(Editable arg0) {

                // TODO Auto-generated method stub

            }

        });

    }

    /**

     * 模拟数据

     */

    private void initData(){

        list.add("皖A0000");

        list.add("皖A1000");

        list.add("皖A1100");

        list.add("皖A1110");

        list.add("皖A1111");

        list.add("皖A2000");

        list.add("皖A2100");

        list.add("皖A2110");

        list.add("皖A2111");

        list.add("皖A2200");

        list.add("皖A2201");

        list.add("皖A2210");

        list.add("皖A2211");

        list.add("皖A2223");

        list.add("皖A3000");

        list.add("皖A4030");

        list.add("皖A5000");

        list.add("皖A6200");

        list.add("皖A7060");

        list.add("皖A8070");

        list.add("皖A9000");

    }

    /**

     * 适配器

     * @author Administrator

     *

     */

    private class MyAdapter extends BaseAdapter{

        private Context context;

        private List<SpannableString> carList;

        public MyAdapter(Context context, List<SpannableString> carList) {

            super();

            this.context = context;

            this.carList = carList;

        }

        @Override

        public int getCount() {

            // TODO Auto-generated method stub

            return carList.size();

        }

        @Override

        public Object getItem(int arg0) {

            // TODO Auto-generated method stub

            return null;

        }

        @Override

        public long getItemId(int arg0) {

            // TODO Auto-generated method stub

            return 0;

        }

        @Override

        public View getView(int arg0, View arg1, ViewGroup arg2) {

            // TODO Auto-generated method stub

            ViewHoler holer = null;

            if(arg1 == null) {

                holer = new ViewHoler();

                arg1 = View.inflate(context, R.layout.item_adpter, null);

                holer.tv_name = (TextView)arg1.findViewById(R.id.item_carnum);

                arg1.setTag(holer);

            }else {

                holer = (ViewHoler)arg1.getTag();

            }

            holer.tv_name.setText(carList.get(arg0));

            return arg1;

        }

        class ViewHoler{

            private TextView tv_name;

        }

    }

}
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edittext 监听内容变化

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