在 Android 应用中使用警示框 Alerts

ysitbook

1. //declared as final to be able to reference it in inner class declartations of the handlers
   
2.      final AlertDialog.Builder builder=new AlertDialog.Builder(this);
   
3.      builder.setTitle("Alert Dialog");
   
4.      builder.setMessage("This is the alert's body");
   
5.      builder.setIcon(android.R.drawable.ic_dialog_alert);
   
6.      
   
7.      builder.setPositiveButton("OK", new OnClickListener() {
   
8.    
   
9.    @Override
   
10.    public void onClick(DialogInterface dialog, int which) {
    
11.     TextView txt=(TextView)findViewById(R.id.txt);
    
12.     txt.setText("You clicked Ok");
    
13.    }
    
14.   });
    
15.      
    
16.      builder.setNegativeButton("Cancel", new OnClickListener() {
    
17.    
    
18.    @Override
    
19.    public void onClick(DialogInterface dialog, int which) {
    
20.     // TODO Auto-generated method stub
    
21.     TextView txt=(TextView)findViewById(R.id.txt);
    
22.     txt.setText("You clicked Cancel");
    
23.    }
    
24.   });
    
25.      
    
26.      builder.setNeutralButton("Do something", new OnClickListener() {
    
27.    
    
28.    @Override
    
29.    public void onClick(DialogInterface dialog, int which) {
    
30.     // TODO Auto-generated method stub
    
31.     TextView txt=(TextView)findViewById(R.id.txt);
    
32.     txt.setText("Neutral Button Clicked");
    
33.     AlertDialog ad=builder.create();
    
34.     ad.cancel();
    
35.    }
    
36.   });
    
37.      
    
38.      builder.setOnCancelListener(new OnCancelListener() {
    
39.    
    
40.    @Override
    
41.    public void onCancel(DialogInterface dialog) {
    
42.     // TODO Auto-generated method stub
    
43.     TextView txt=(TextView)findViewById(R.id.txt);
    
44.     txt.setText(txt.getText()+" the cancel listner invoked");
    
45.    }
    
46.   });
    
47.      
    
48.      
    
49.      
    
50.      builder.show();

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surpass_li

学习了，谢谢