android 获取应用程序包名，图标，入口Activity类

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最近老是用到关于程序包名，图标问题，现总结如下：

1. PackageInfo info;    
2. try {    
3. 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：

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. 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. 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. 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.     }