Android入门第九篇之AlertDialog

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       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。

       先贴出程序运行的截图：

main.xml的源码：

[xhtml] view plain copy print ?

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：

[xhtml] view plain copy print ?

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：

[java] view plain copy print ?

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. }  

package com.testAlertDialog;import android.app.Activity;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.os.Bundle;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.PopupWindow;public class testAlertDialog extends Activity { Button btnShowDialog; Button btnShowDialog_Layout;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        //定义按钮        btnShowDialog=(Button)this.findViewById(R.id.Button01);        btnShowDialog.setOnClickListener(new ClickEvent());        btnShowDialog_Layout=(Button)this.findViewById(R.id.Button02);        btnShowDialog_Layout.setOnClickListener(new ClickEvent());    }            //统一处理按键事件    class ClickEvent implements OnClickListener{     @Override     public void onClick(View v) {      // TODO Auto-generated method stub      if(v==btnShowDialog)       showDialog(testAlertDialog.this);             else if(v==btnShowDialog_Layout)       showDialog_Layout(testAlertDialog.this);           }    }    //显示基本的AlertDialog private void showDialog(Context context) {  AlertDialog.Builder builder = new AlertDialog.Builder(context);  builder.setIcon(R.drawable.icon);  builder.setTitle("Title");  builder.setMessage("Message");  builder.setPositiveButton("Button1",    new DialogInterface.OnClickListener() {     public void onClick(DialogInterface dialog, int whichButton) {      setTitle("点击了对话框上的Button1");     }    });  builder.setNeutralButton("Button2",    new DialogInterface.OnClickListener() {     public void onClick(DialogInterface dialog, int whichButton) {      setTitle("点击了对话框上的Button2");     }    });  builder.setNegativeButton("Button3",    new DialogInterface.OnClickListener() {     public void onClick(DialogInterface dialog, int whichButton) {      setTitle("点击了对话框上的Button3");     }    });  builder.show(); }    //显示基于Layout的AlertDialog private void showDialog_Layout(Context context) {  LayoutInflater inflater = LayoutInflater.from(this);  final View textEntryView = inflater.inflate(    R.layout.dialoglayout, null);  final EditText edtInput=(EditText)textEntryView.findViewById(R.id.edtInput);  final AlertDialog.Builder builder = new AlertDialog.Builder(context);  builder.setCancelable(false);  builder.setIcon(R.drawable.icon);  builder.setTitle("Title");  builder.setView(textEntryView);  builder.setPositiveButton("确认",    new DialogInterface.OnClickListener() {     public void onClick(DialogInterface dialog, int whichButton) {      setTitle(edtInput.getText());     }    });  builder.setNegativeButton("取消",    new DialogInterface.OnClickListener() {     public void onClick(DialogInterface dialog, int whichButton) {      setTitle("");     }    });  builder.show(); }}

           

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