Android入门第九篇之AlertDialog

时隔一年，又要准备做Android的开发了，最近复习和整理一下Android的知识。 这次要说的是AlertDialog，这种对话框会经常遇到。AlertDialog跟WIN32开发中的Dialog不一样，AlertDialog是非阻塞的，而阻塞的对话框用的是PopupWindow。

 

main.xml的源码：

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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.   
8. < Button   android:id = "@+id/Button01"   android:layout_height = "wrap_content"   android:text = "非Layout型对话框"   android:layout_width = "fill_parent" > </ Button >   
9. < Button   android:id = "@+id/Button02"   android:layout_height = "wrap_content"   android:text = "Layout型对话框"   android:layout_width = "fill_parent" > </ Button > < View   android:id = "@+id/View01"   android:layout_width = "wrap_content"   android:layout_height = "wrap_content" > </ View >   
10.   
11. </ 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:text="非Layout型对话框" android:layout_width="fill_parent"></Button> <Button android:id="@+id/Button02" android:layout_height="wrap_content" android:text="Layout型对话框" android:layout_width="fill_parent"></Button><View android:id="@+id/View01" android:layout_width="wrap_content" android:layout_height="wrap_content"></View> </LinearLayout>

下图是非Layout型对话框，直接使用AlertDialog

下图是使用了Layout的对话框，可以自定义控件，实现更复杂的对话框

dialoglayout.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" >   
6.     < EditText   android:layout_height = "wrap_content"   
7.         android:layout_width = "fill_parent"   android:layout_marginLeft = "20dip"   
8.         android:layout_marginRight = "20dip"   android:textAppearance = "?android:attr/textAppearanceMedium"   android:id = "@+id/edtInput" />   
9. </ 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"> <EditText android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_marginLeft="20dip" android:layout_marginRight="20dip" android:textAppearance="?android:attr/textAppearanceMedium" android:id="@+id/edtInput"/> </LinearLayout>

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.view.Gravity;  
9. import  android.view.LayoutInflater;  
10. import  android.view.View;  
11. import  android.view.View.OnClickListener;  
12. import  android.widget.Button;  
13. import  android.widget.EditText;  
14. import  android.widget.PopupWindow;  
15.   
16.   
17. public   class  testAlertDialog  extends  Activity {  
18.     Button btnShowDialog;  
19.     Button btnShowDialog_Layout;  
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.         btnShowDialog=(Button)this .findViewById(R.id.Button01);  
27.         btnShowDialog.setOnClickListener(new  ClickEvent());  
28.         btnShowDialog_Layout=(Button)this .findViewById(R.id.Button02);  
29.         btnShowDialog_Layout.setOnClickListener(new  ClickEvent());  
30.     }  
31.       
32.       
33.     //统一处理按键事件   
34.     class  ClickEvent  implements  OnClickListener{  
35.   
36.         @Override   
37.         public   void  onClick(View v) {  
38.             // TODO Auto-generated method stub   
39.             if (v==btnShowDialog)  
40.                 showDialog(testAlertDialog.this );  
41.                   
42.             else   if (v==btnShowDialog_Layout)  
43.                 showDialog_Layout(testAlertDialog.this );  
44.               
45.         }  
46.   
47.     }  
48.   
49.     //显示基本的AlertDialog   
50.     private   void  showDialog(Context context) {  
51.         AlertDialog.Builder builder = new  AlertDialog.Builder(context);  
52.         builder.setIcon(R.drawable.icon);  
53.         builder.setTitle("Title" );  
54.         builder.setMessage("Message" );  
55.         builder.setPositiveButton("Button1" ,  
56.                 new  DialogInterface.OnClickListener() {  
57.                     public   void  onClick(DialogInterface dialog,  int  whichButton) {  
58.                         setTitle("点击了对话框上的Button1" );  
59.                     }  
60.                 });  
61.         builder.setNeutralButton("Button2" ,  
62.                 new  DialogInterface.OnClickListener() {  
63.                     public   void  onClick(DialogInterface dialog,  int  whichButton) {  
64.                         setTitle("点击了对话框上的Button2" );  
65.                     }  
66.                 });  
67.         builder.setNegativeButton("Button3" ,  
68.                 new  DialogInterface.OnClickListener() {  
69.                     public   void  onClick(DialogInterface dialog,  int  whichButton) {  
70.                         setTitle("点击了对话框上的Button3" );  
71.                     }  
72.                 });  
73.         builder.show();  
74.     }  
75.   
76.   
77.     //显示基于Layout的AlertDialog   
78.     private   void  showDialog_Layout(Context context) {  
79.         LayoutInflater inflater = LayoutInflater.from(this );  
80.         final  View textEntryView = inflater.inflate(  
81.                 R.layout.dialoglayout, null );  
82.         final  EditText edtInput=(EditText)textEntryView.findViewById(R.id.edtInput);  
83.         final  AlertDialog.Builder builder =  new  AlertDialog.Builder(context);  
84.         builder.setCancelable(false );  
85.         builder.setIcon(R.drawable.icon);  
86.         builder.setTitle("Title" );  
87.         builder.setView(textEntryView);  
88.         builder.setPositiveButton("确认" ,  
89.                 new  DialogInterface.OnClickListener() {  
90.                     public   void  onClick(DialogInterface dialog,  int  whichButton) {  
91.                         setTitle(edtInput.getText());  
92.                     }  
93.                 });  
94.         builder.setNegativeButton("取消" ,  
95.                 new  DialogInterface.OnClickListener() {  
96.                     public   void  onClick(DialogInterface dialog,  int  whichButton) {  
97.                         setTitle("" );  
98.                     }  
99.                 });  
100.         builder.show();  
101.     }  
102. }