Android PopupWindow嵌套ListView（模仿分類下拉菜單效果）

1:布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android&quot;

    xmlns:tools="http://schemas.android.com/tools&quot;

    android:layout_width="match_parent"

    android:layout_height="match_parent"

 >


   <TextView   
            android:id="@+id/tv_text_age"  
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content"  
            android:background="@drawable/choolse_bg"  
            android:text="不限"  
            android:paddingLeft="12dp"  
            android:textColor="#9d72d2"  
            android:layout_centerInParent="true"  
            android:gravity="center_vertical"  
            />  

</RelativeLayout></pre>
    package com.jackie.popupwindow;

    import java.util.ArrayList;

    import java.util.List;


import android.app.Activity;  
import android.graphics.Color;  
import android.graphics.drawable.ColorDrawable;  
import android.os.Bundle;  
import android.view.LayoutInflater;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.view.ViewGroup;  
import android.view.ViewGroup.LayoutParams;  
import android.widget.AdapterView;  
import android.widget.AdapterView.OnItemClickListener;  
import android.widget.BaseAdapter;  
import android.widget.ListView;  
import android.widget.PopupWindow;  
import android.widget.TextView;  

public class MainActivity extends Activity implements OnClickListener {  
    private TextView tv_text_age;  
    private PopupWindow pop;  
    ListView listView = null;  
    private List<String> datas;  
    private SelectAgeAdapter mSelectAdapter;  
    private LayoutInflater inflater;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        initData();  
        inflater = LayoutInflater.from(this);  
        tv_text_age = (TextView) findViewById(R.id.tv_text_age);  
        tv_text_age.setOnClickListener(this);  
    }  
    private void initData() {  
        datas = new ArrayList<String>();  
        for(int i = 0; i < 50; i++){  
            datas.add("HelloWorld - " + i);  
        }  
    }  
    @Override  
    public void onClick(View v) {  
        if(v.getId() == R.id.tv_text_age){  
            if(pop == null) {  
                listView = new ListView(this);  
                listView.setDividerHeight(1);  
                listView.setBackgroundResource(R.drawable.kge_feek_bg);  
                listView.setCacheColorHint(0x00000000);  
                mSelectAdapter = new SelectAgeAdapter();  
                pop = new PopupWindow(listView, tv_text_age.getWidth(), LayoutParams.WRAP_CONTENT, true);  
            }  
            listView.setAdapter(mSelectAdapter);  
            pop.setBackgroundDrawable(new ColorDrawable(Color.RED));
            pop.showAsDropDown(tv_text_age, 0, 0);  

            listView.setOnItemClickListener(new OnItemClickListener() {  
                @Override  
                public void onItemClick(AdapterView<?> parent, View view,  
                        int position, long id) {  
                    tv_text_age.setText(datas.get(position));  
                    dismissPopWindow();  
                }  
            });  
        }  
    }  
    public void dismissPopWindow() {  
        if(pop != null && pop.isShowing()){  
            pop.dismiss();  
        }  
    }  

    class SelectAgeAdapter extends BaseAdapter {  

        @Override  
        public int getCount() {  
            return datas != null&&datas.size() > 0 ? datas.size() : 0;  
        }  

        @Override  
        public Object getItem(int position) {  
            return datas.get(position);  
        }  

        @Override  
        public long getItemId(int position) {  
            return position;  
        }  

        @Override  
        public View getView(int position, View convertView, ViewGroup parent) {  
            ViewHolder holder;  
            if (convertView == null) {  
                holder = new ViewHolder();  
                convertView = inflater.inflate(R.layout.item, null);  
                holder.tv_name = (TextView) convertView.findViewById(R.id.tv_name);  
                convertView.setTag(holder);  

            } else {  
                holder = (ViewHolder) convertView.getTag();  
            }  
            holder.tv_name.setText(datas.get(position));  
            return convertView;  
        }  
    }  
    class ViewHolder {  
        TextView tv_name;  
    }  
}  </pre>