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;
}
}

}