1:佈局檔案

1. <span style="font-size:18px;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
2.     xmlns:tools="http://schemas.android.com/tools"
3.     android:layout_width="match_parent"
4.     android:layout_height="match_parent"
5.  >  
6.        <TextView   
7.                 android:id="@+id/tv_text_age"
8.                 android:layout_width="wrap_content"
9.                 android:layout_height="wrap_content"
10.                 android:background="@drawable/choolse_bg"
11.                 android:text="不限"
12.                 android:paddingLeft="12dp"
13.                 android:textColor="#9d72d2"
14.                 android:layout_centerInParent="true"
15.                 android:gravity="center_vertical"
16.                 />  
17. </RelativeLayout></span>  

1. package com.jackie.popupwindow;  
2. import java.util.ArrayList;  
3. import java.util.List;  
4. import android.app.Activity;  
5. import android.graphics.Color;  
6. import android.graphics.drawable.ColorDrawable;  
7. import android.os.Bundle;  
8. import android.view.LayoutInflater;  
9. import android.view.View;  
10. import android.view.View.OnClickListener;  
11. import android.view.ViewGroup;  
12. import android.view.ViewGroup.LayoutParams;  
13. import android.widget.AdapterView;  
14. import android.widget.AdapterView.OnItemClickListener;  
15. import android.widget.BaseAdapter;  
16. import android.widget.ListView;  
17. import android.widget.PopupWindow;  
18. import android.widget.TextView;  
19. public class MainActivity extends Activity implements OnClickListener {  
20.     private TextView tv_text_age;  
21.     private PopupWindow pop;  
22.     ListView listView = null;  
23.     private List<String> datas;  
24.     private SelectAgeAdapter mSelectAdapter;  
25.     private LayoutInflater inflater;  
26.     @Override  
27.     protected void onCreate(Bundle savedInstanceState) {  
28.         super.onCreate(savedInstanceState);  
29.         setContentView(R.layout.activity_main);  
30.         initData();  
31.         inflater = LayoutInflater.from(this);  
32.         tv_text_age = (TextView) findViewById(R.id.tv_text_age);  
33.         tv_text_age.setOnClickListener(this);  
34.     }  
35.     private void initData() {  
36.         datas = new ArrayList<String>();  
37.         for(int i = 0; i < 50; i++){  
38.             datas.add("HelloWorld - " + i);  
39.         }  
40.     }  
41.     @Override  
42.     public void onClick(View v) {  
43.         if(v.getId() == R.id.tv_text_age){  
44.             if(pop == null) {  
45.                 listView = new ListView(this);  
46.                 listView.setDividerHeight(1);  
47.                 listView.setBackgroundResource(R.drawable.kge_feek_bg);  
48.                 listView.setCacheColorHint(0x00000000);  
49.                 mSelectAdapter = new SelectAgeAdapter();  
50.                 pop = new PopupWindow(listView, tv_text_age.getWidth(), LayoutParams.WRAP_CONTENT, true);  
51.             }  
52.             listView.setAdapter(mSelectAdapter);  
53.             pop.setBackgroundDrawable(new ColorDrawable(Color.RED));
54.             pop.showAsDropDown(tv_text_age, 0, 0);  
55.             listView.setOnItemClickListener(new OnItemClickListener() {  
56.                 @Override  
57.                 public void onItemClick(AdapterView<?> parent, View view,  
58.                         int position, long id) {  
59.                     tv_text_age.setText(datas.get(position));  
60.                     dismissPopWindow();  
61.                 }  
62.             });  
63.         }  
64.     }  
65.     public void dismissPopWindow() {  
66.         if(pop != null && pop.isShowing()){  
67.             pop.dismiss();  
68.         }  
69.     }  
70.     class SelectAgeAdapter extends BaseAdapter {  
71.         @Override  
72.         public int getCount() {  
73.             return datas != null&&datas.size() > 0 ? datas.size() : 0;  
74.         }  
75.         @Override  
76.         public Object getItem(int position) {  
77.             return datas.get(position);  
78.         }  
79.         @Override  
80.         public long getItemId(int position) {  
81.             return position;  
82.         }  
83.         @Override  
84.         public View getView(int position, View convertView, ViewGroup parent) {  
85.             ViewHolder holder;  
86.             if (convertView == null) {  
87.                 holder = new ViewHolder();  
88.                 convertView = inflater.inflate(R.layout.item, null);  
89.                 holder.tv_name = (TextView) convertView.findViewById(R.id.tv_name);  
90.                 convertView.setTag(holder);  
91.             } else {  
92.                 holder = (ViewHolder) convertView.getTag();  
93.             }  
94.             holder.tv_name.setText(datas.get(position));  
95.             return convertView;  
96.         }  
97.     }  
98.     class ViewHolder {  
99.         TextView tv_name;  
100.     }  
101. }