自定义PopWindow,实现简单的回调函数，自己实现简单的CallBack

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首先定义一个接口类：

interface CallBack {
void onItemClick(int pos);
}

下面的是Bean类；
public class City {
   public String name;
   public String number;

   public City(String name,String number){
       this.name = name;
       this.number = number;
   }
   @Override
   public String toString() {
       return "City [name=" + name + ", number=" + number + "]";
   }
}

下面是三个简单的xml文件：

1、 activity_main.xml

2、PopWindow中的xml文件里是一个ListView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@android:color/background_light"
    android:orientation="vertical" >

    <ListView
        android:id="@+id/lv"
        android:layout_gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>

3、ListView的每个Item中是一个TextView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView
        android:id="@+id/tv_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

最主要的是自定义的PopWindow
/** @TODO
* @author miaotingxu
* @date 2016-3-17 上午9:55:12 */
public class MyPopWindow extends PopupWindow {

   View conentView;
   List<City> list;

   public MyPopWindow(final Activity context,List<City> list){
       this.list = list;
       LayoutInflater inflater = (LayoutInflater) context
               .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       conentView = inflater.inflate(R.layout.pop, null);
       int h = context.getWindowManager().getDefaultDisplay().getHeight();
       int w = context.getWindowManager().getDefaultDisplay().getWidth();
       // 设置SelectPicPopupWindow的View
       this.setContentView(conentView);
       // 设置SelectPicPopupWindow弹出窗体的宽
       this.setWidth(100);
       // 设置SelectPicPopupWindow弹出窗体的高
       this.setHeight(LayoutParams.WRAP_CONTENT);
       // 设置SelectPicPopupWindow弹出窗体可点击
       this.setFocusable(true);
       this.setOutsideTouchable(true);
       // 刷新状态
       this.update();
       // 实例化一个ColorDrawable颜色为半透明
       ColorDrawable dw = new ColorDrawable(0000000000);
       // 点back键和其他地方使其消失,设置了这个才能触发OnDismisslistener ，设置其他控件变化等操作
       this.setBackgroundDrawable(dw);
       // mPopupWindow.setAnimationStyle(android.R.style.Animation_Dialog);
       ListView lv = (ListView) conentView.findViewById(R.id.lv);

       Myadapter adapter=new Myadapter(context);
       lv.setAdapter(adapter);
       lv.setOnItemClickListener(new OnItemClickListener(){
           @Override
           public void onItemClick(AdapterView<?> parent, View view,
                   int position, long id) {
               cBack.onItemClick(position);
               dismiss();
           }
       });
   }

   CallBack cBack;
   public void setOnItem(CallBack cBack) {
       this.cBack = cBack;
   }

   class Myadapter extends BaseAdapter {
       LayoutInflater inflater;
       public Myadapter(Context ctx){
           inflater = LayoutInflater.from(ctx);
       }
       @Override
       public int getCount() {
           return list.size();
       }

       @Override
       public Object getItem(int position) {
           return position;
       }
       /** TODO */
       @Override
       public long getItemId(int position) {
           return position;
       }
       /** TODO */
       @Override
       public View getView(int position, View convertView, ViewGroup parent) {
           if (convertView == null) {
               convertView = inflater.inflate(R.layout.item, null);
           }
           TextView tv = (TextView) convertView.findViewById(R.id.tv_item);
           tv.setText("" + list.get(position).name);
           return convertView;
       }
   }

}

下面是MainActivity

public class MainActivity extends Activity {

   private TextView tv;
   ArrayList<City> list = new ArrayList<City>();
   private MyPopWindow popupWindow;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       tv = (TextView) findViewById(R.id.tv);
       list.add(new City("name1","123"));
       list.add(new City("name2","223"));
       list.add(new City("name3","333"));
       popupWindow = new MyPopWindow(this,list );
       popupWindow.setOnItem(new CallBack(){
           @Override
           public void onItemClick(int pos) {
               Toast.makeText(MainActivity.this, list.get(pos).number, 1).show();
           }
       });
       tv.setOnClickListener(new View.OnClickListener(){
           @Override
           public void onClick(View v) {
               popupWindow.setWidth(v.getWidth());
               popupWindow.showAsDropDown(v);
           }
       });
   }

   class Myadapter extends BaseAdapter {
       LayoutInflater inflater;
       public Myadapter(Context ctx){
           inflater = LayoutInflater.from(ctx);
       }
       /** TODO */
       @Override
       public int getCount() {
           return list.size();
       }
       /** TODO */
       @Override
       public Object getItem(int position) {

           return position;

       }
       @Override
       public long getItemId(int position) {
           return position;
       }
       @Override
       public View getView(int position, View convertView, ViewGroup parent) {
           if (convertView == null) {
               convertView = inflater.inflate(R.layout.item, null);
           }
           TextView tv = (TextView) convertView.findViewById(R.id.tv_item);
           tv.setText("" + list.get(position));
           return convertView;
       }
   }
}

Demo到此结束，这个Demo中用到了自定义PopWindw,回调函数，希望能帮助比我还菜的菜鸟，

也希望大牛能指教一些有技术含量的。

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