android 获取应用程序包名，图标，入口Activity类

最近老是用到关于程序包名，图标问题，现总结如下：

[java]  view plain copy

1. PackageInfo info;    
2.         try {    
3.             info = this.getPackageManager().getPackageInfo(this.getPackageName(), 0);    
4.             // 当前应用的版本名称    
5.             String versionName = info.versionName;    
6.             // 当前版本的版本号    
7.             int versionCode = info.versionCode;    
8.             // 当前版本的包名    
9.             String packageNames = info.packageName;    
10.         } catch (NameNotFoundException e) {    
11.             e.printStackTrace();    
12.         }    

另一种方法：

[java]  view plain copy

1. public class Info {    
2.     Context context ;    
3.     PackageManager pm ;    
4.     public Info(Context context) {    
5.         this.context = context;    
6.         pm = context.getPackageManager();    
7.     }    
8.     /*  
9.      * 获取程序 图标  
10.      */    
11.     public Drawable getAppIcon(String packname){    
12.       try {    
13.              ApplicationInfo info = pm.getApplicationInfo(packname, 0);     
14.              return info.loadIcon(pm);    
15.         } catch (NameNotFoundException e) {    
16.             // TODO Auto-generated catch block    
17.             e.printStackTrace();    
18.               
19.         }    
20.     }    
21.         
22.     /*  
23.      *获取程序的版本号    
24.      */    
25.     public String getAppVersion(String packname){    
26.             
27.           try {    
28.               PackageInfo packinfo = pm.getPackageInfo(packname, 0);    
29.               return packinfo.versionName;    
30.             } catch (NameNotFoundException e) {    
31.                 e.printStackTrace();    
32.                    
33.             }    
34.     }    
35.         
36.     
37.     /*  
38.      * 获取程序的名字   
39.      */    
40.     public String getAppName(String packname){    
41.           try {    
42.                  ApplicationInfo info = pm.getApplicationInfo(packname, 0);     
43.                  return info.loadLabel(pm).toString();    
44.             } catch (NameNotFoundException e) {    
45.                 // TODO Auto-generated catch block    
46.                 e.printStackTrace();    
47.                  
48.             }    
49.     }    
50.     /*  
51.      * 获取程序的权限  
52.      */    
53.     public String[] getAppPremission(String packname){    
54.           try {    
55.               PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_PERMISSIONS);    
56.               //获取到所有的权限     
57.               return packinfo.requestedPermissions;    
58.     
59.             } catch (NameNotFoundException e) {    
60.                 e.printStackTrace();    
61.                    
62.             }    
63.     }    
64.         
65.         
66.     /*  
67.      * 获取程序的签名   
68.      */    
69.     public String getAppSignature(String packname){    
70.           try {    
71.               PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);    
72.               //获取到所有的权限     
73.               return packinfo.signatures[0].toCharsString();    
74.     
75.             } catch (NameNotFoundException e) {    
76.                 e.printStackTrace();    
77.                   
78.             }    
79.     }    
80. http://blog.youkuaiyun.com/yudajun/article/details/7855270