安卓中有一個重要的控件ListView,安卓通過讓用戶實現BaseAdapter類來連接ListView和數據列表，將數據綁定顯示在ListView中。適配器模式連接兩個不兼容的接口，使兩個不能一起工作的兩個接口實現一起工作的功能。
例子通過模仿Android的ListView實現過程來驗證適配器模式，類圖結構如下：
實現代碼：
var Adapter = Class.extend({
listview:null,
dataChanged:function(){
if (this.listview != null)
{
listview.draw();
}
},
getView:function(position){
return "";
},
getCount:function(){
return 0;
},
getObject:function(index){
return null;
}
});
var ListView = Class.extend({
id:null,
adapter:null,
ctor:function(_id){
this.id = _id;
},
setAdapter:function(_adapter){
this.adapter = _adapter;
_adapter.listview = this;
},
setOnItemClick:function(_callback){
this.callback = String(_callback).replace(/^function(\s|\n)+(.+)\((.|\n)+$/,'$2');
},
draw:function(){
var txt = "";
if(this.adapter != null){
for(var i = 0;i < this.adapter.getCount();i++){
txt += "<div onclick = '" + this.callback + "(" + i + ")"+ "'>" + this.adapter.getView(i) + "</div>";
}
}
document.getElementById(this.id).innerHTML = txt;
}
});
var MyAdapter = Adapter.extend({
bean:[],
ctor:function(_data){
this.bean = _data
},
getCount:function(){
return this.bean.length;
},
getView:function(position){
var data = this.bean[position];
var tmpl = "<div class = 'row'><div class = 'col-xs-3'>姓名</div><div class = 'col-xs-7' style = 'text-align:right'>${name}</div></div><div class = 'row'><div class = 'col-xs-4'>${sex}</div><div class = 'col-xs-4'>${age}</div><div class = 'col-xs-4'>${address}</div></div>";
while(tmpl.indexOf("${") > 0){
var start = tmpl.indexOf("${");
var end = tmpl.indexOf("}");
var key = tmpl.substring(start,end+1);
tmpl = tmpl.replace(key,data[key.replace("${","").replace("}","")]);
}
return tmpl;
},
getObject:function(position){
return bean[position];
}
});
<body>
<button onclick = "loadData()">加載數據</button>
<div id = "listview">
</div>
</body>
<script>
var beans = [{name:'小紅',sex:'女',age:11,address:"廈門"},{name:'小明',sex:'男',age:12,address:'溫州'}];
var myAdapter = null;
var listview = null;
(function(){
myAdapter = new MyAdapter(beans);
listview = new ListView("listview");
listview.setAdapter(myAdapter);
})();
function loadData(){
myAdapter.dataChanged();
}
</script>運行的效果圖：
適配器模式的優點主要是將兩個沒有關聯的類連接在一起，提高了複用，正如上面的例子ListView作爲列表可以用在任何場合，數據類也可以在任何場合下繼續使用，適配器將兩者連接成整體工作達到效果。
適配器過多會造成系統的混亂，不易於程序的可讀性。