Android入门第十篇之PopupWindow

 

http://blog.youkuaiyun.com/hellogv/archive/2010/10/21/5956358.aspx

本文来自http://blog.youkuaiyun.com/hellogv/ ，引用必须注明出处！    

       介绍过AlertDialog之后，接下来就介绍一下PopupWindow这种对话框。PopupWindow是阻塞对话框，只有在外部线程 或者 PopupWindow本身做退出操作才行。PopupWindow完全依赖Layout做外观，在常见的开发中，PopupWindow应该会与 AlertDialog常混用。

       贴出本例中运行的结果图：

main.xml的源码如下：

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1. <? xml   version = "1.0"   encoding = "utf-8" ?>   
2. < LinearLayout   xmlns:android = "http://schemas.android.com/apk/res/android"   
3.     android:orientation = "vertical"   
4.     android:layout_width = "fill_parent"   
5.     android:layout_height = "fill_parent"   
6.     >   
7. < Button   android:id = "@+id/Button01"   android:layout_height = "wrap_content"   android:layout_width = "fill_parent"   android:text = "PopupWindow演示" > </ Button >   
8. </ LinearLayout >   

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/Button01" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="PopupWindow演示"></Button> </LinearLayout>

 

下图是PopupWindow弹出的截图，这里的PopupWindow是个登录框，点“确定”则自动填写，点“取消”则关闭PopupWindow。

 

popupwindow.xml的源码：

 

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1. <? xml   version = "1.0"   encoding = "utf-8" ?>   
2.   
3. < LinearLayout   xmlns:android = "http://schemas.android.com/apk/res/android"   
4.     android:layout_width = "fill_parent"   android:layout_height = "wrap_content"   
5.     android:orientation = "vertical"   android:background = "#000000" >   
6.   
7.     < TextView   android:id = "@+id/username_view"   
8.         android:layout_height = "wrap_content"   
9.         android:layout_marginLeft = "20dip"   
10.         android:layout_marginRight = "20dip"   android:text = "用户名"   
11.         android:textAppearance = "?android:attr/textAppearanceMedium"   android:layout_width = "fill_parent" />   
12.   
13.     < EditText   android:id = "@+id/username_edit"   
14.         android:layout_height = "wrap_content"   
15.         android:layout_width = "fill_parent"   android:layout_marginLeft = "20dip"   
16.         android:layout_marginRight = "20dip"   android:capitalize = "none"   
17.         android:textAppearance = "?android:attr/textAppearanceMedium"   />   
18.   
19.     < TextView   android:id = "@+id/password_view"   
20.         android:layout_height = "wrap_content"   
21.         android:layout_marginLeft = "20dip"   
22.         android:layout_marginRight = "20dip"   android:text = "密码"   
23.         android:textAppearance = "?android:attr/textAppearanceMedium"   android:layout_width = "fill_parent" />   
24.   
25.     < EditText   android:id = "@+id/password_edit"   
26.         android:layout_height = "wrap_content"   
27.         android:layout_width = "fill_parent"   android:layout_marginLeft = "20dip"   
28.         android:layout_marginRight = "20dip"   android:capitalize = "none"   
29.         android:password = "true"   
30.         android:textAppearance = "?android:attr/textAppearanceMedium"   />   
31.   
32. < LinearLayout   android:id = "@+id/LinearLayout01"   android:layout_height = "wrap_content"   android:layout_width = "fill_parent"   android:gravity = "center" > < Button   android:layout_width = "wrap_content"   android:layout_height = "wrap_content"   android:id = "@+id/BtnOK"   android:layout_weight = "100"   android:text = "确定" > </ Button > < Button   android:layout_width = "wrap_content"   android:layout_height = "wrap_content"   android:layout_weight = "100"   android:text = "取消"   android:id = "@+id/BtnCancel" > </ Button > </ LinearLayout >   
33. </ LinearLayout >   

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical" android:background="#000000"> <TextView android:id="@+id/username_view" android:layout_height="wrap_content" android:layout_marginLeft="20dip" android:layout_marginRight="20dip" android:text="用户名" android:textAppearance="?android:attr/textAppearanceMedium" android:layout_width="fill_parent"/> <EditText android:id="@+id/username_edit" android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_marginLeft="20dip" android:layout_marginRight="20dip" android:capitalize="none" android:textAppearance="?android:attr/textAppearanceMedium" /> <TextView android:id="@+id/password_view" android:layout_height="wrap_content" android:layout_marginLeft="20dip" android:layout_marginRight="20dip" android:text="密码" android:textAppearance="?android:attr/textAppearanceMedium" android:layout_width="fill_parent"/> <EditText android:id="@+id/password_edit" android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_marginLeft="20dip" android:layout_marginRight="20dip" android:capitalize="none" android:password="true" android:textAppearance="?android:attr/textAppearanceMedium" /> <LinearLayout android:id="@+id/LinearLayout01" android:layout_height="wrap_content" android:layout_width="fill_parent" android:gravity="center"><Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/BtnOK" android:layout_weight="100" android:text="确定"></Button><Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="100" android:text="取消" android:id="@+id/BtnCancel"></Button></LinearLayout> </LinearLayout>

接下来是程序源码：

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1. package  com.testAlertDialog;  
2.   
3. import  android.app.Activity;  
4. import  android.app.AlertDialog;  
5. import  android.content.Context;  
6. import  android.content.DialogInterface;  
7. import  android.os.Bundle;  
8. import  android.text.Editable;  
9. import  android.view.Gravity;  
10. import  android.view.LayoutInflater;  
11. import  android.view.View;  
12. import  android.view.View.OnClickListener;  
13. import  android.widget.Button;  
14. import  android.widget.EditText;  
15. import  android.widget.PopupWindow;  
16.   
17.   
18. public   class  testAlertDialog  extends  Activity {  
19.     Button btnPopupWindow;  
20.     /** Called when the activity is first created. */   
21.     @Override   
22.     public   void  onCreate(Bundle savedInstanceState) {  
23.         super .onCreate(savedInstanceState);  
24.         setContentView(R.layout.main);  
25.         //定义按钮   
26.         btnPopupWindow=(Button)this .findViewById(R.id.Button01);  
27.         btnPopupWindow.setOnClickListener(new  ClickEvent());  
28.     }  
29.       
30.       
31.     //统一处理按键事件   
32.     class  ClickEvent  implements  OnClickListener{  
33.   
34.         @Override   
35.         public   void  onClick(View v) {  
36.             // TODO Auto-generated method stub   
37.             if (v==btnPopupWindow)  
38.             {  
39.                 showPopupWindow(testAlertDialog.this ,  
40.                         testAlertDialog.this .findViewById(R.id.Button01));  
41.             }  
42.         }  
43.     }  
44.   
45.     public   void  showPopupWindow(Context context,View parent){  
46.         LayoutInflater inflater = (LayoutInflater)     
47.            context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);     
48.         final  View vPopupWindow=inflater.inflate(R.layout.popupwindow,  null ,  false );  
49.         final  PopupWindow pw=  new  PopupWindow(vPopupWindow, 300 , 300 , true );  
50.   
51.         //OK按钮及其处理事件   
52.         Button btnOK=(Button)vPopupWindow.findViewById(R.id.BtnOK);  
53.         btnOK.setOnClickListener(new  OnClickListener(){  
54.             @Override   
55.             public   void  onClick(View v) {  
56.                 //设置文本框内容   
57.                 EditText edtUsername=(EditText)vPopupWindow.findViewById(R.id.username_edit);  
58.                 edtUsername.setText("username" );  
59.                 EditText edtPassword=(EditText)vPopupWindow.findViewById(R.id.password_edit);  
60.                 edtPassword.setText("password" );  
61.             }  
62.         });  
63.           
64.       //Cancel按钮及其处理事件   
65.         Button btnCancel=(Button)vPopupWindow.findViewById(R.id.BtnCancel);  
66.         btnCancel.setOnClickListener(new  OnClickListener(){  
67.             @Override   
68.             public   void  onClick(View v) {  
69.                 pw.dismiss();//关闭   
70.             }  
71.         });  
72.         //显示popupWindow对话框   
73.         pw.showAtLocation(parent, Gravity.CENTER, 0 ,  0 );  
74.     }  
75.       
76. }