设置字体大小的对话框

 1 /**
 2  * 
 3  * 事件监听
 4  */
 5     @Override
 6     public void onClick(View v) {
 7         switch (v.getId()) {
 8         case R.id.item_back:
 9             finish();
10             overridePendingTransition(R.anim.lefttoright, R.anim.righttoleft);
11             break;
12         case R.id.item_textsize:
13             showcchoosedig();
14 
15         default:
16             break;
17         }
18         
19     }
20 
21     /**
22      * 
23      * 显示对话框
24      */
25 
26     private int mcurrentChooseitem;//记录当前选中的item
27     private int mcurrentitem=2;//记录当前选择确定后更改的字体
28     private String url;
29     
30     private void showcchoosedig() {
31         AlertDialog.Builder builder = new AlertDialog.Builder(this);//建立对话框
32         
33         String[] items=new String[]{"超大号字体","大号字体","正常字体","小号字体","超小号字体"};
34         
35         builder.setTitle("字体设置");
36         builder.setSingleChoiceItems(items, mcurrentitem, new DialogInterface
37                 .OnClickListener() {
38             
39             @Override
40             public void onClick(DialogInterface dialog, int which) {
41                 System.out.println("选中："+which);
42                 mcurrentChooseitem=which;
43                 
44             }
45         });
46         
47         /**
48          * 设置确定按钮的监听
49          */
50 
51         builder.setPositiveButton("确定", new OnClickListener() {
52             
53             @Override
54             public void onClick(DialogInterface dialog, int which) {
55                  WebSettings settings = item_webnews.getSettings();//创建websetting的对象
56                  switch (mcurrentChooseitem) {
57                 case 0:
58                     settings.setTextSize(TextSize.LARGER);
59                     break;
60                 case 1:
61                     settings.setTextSize(TextSize.LARGEST);
62                     break;
63                 case 2:
64                     settings.setTextSize(TextSize.NORMAL);
65                     break;
66                 case 3:
67                     settings.setTextSize(TextSize.SMALLER);
68                     break;
69                 case 4:
70                     settings.setTextSize(TextSize.SMALLEST);
71                     break;    
72 
73                 default:
74                     break;
75                 }
76                  mcurrentitem=mcurrentChooseitem;//确定点击之后，字体变为所选择的字体大小
77                 
78             }
79             
80             
81         });
82         
83         /**
84          * 设置取消按钮
85          */
86         builder.setNegativeButton("取消", null);//不需要设置监听，因为默认点击就取消
87         
88         builder.show();//将对话框展现
89 
90     
91    }