android 擷取應用程式包名，圖示，入口Activity類

最近老是用到關于程式包名，圖示問題，現總結如下：

[java]  view plain copy

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

另一種方法：

[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.     public Drawable getAppIcon(String packname){    
9.       try {    
10.              ApplicationInfo info = pm.getApplicationInfo(packname, 0);     
11.              return info.loadIcon(pm);    
12.         } catch (NameNotFoundException e) {    
13.             // TODO Auto-generated catch block    
14.             e.printStackTrace();    
15.         }    
16.     }    
17.     public String getAppVersion(String packname){    
18.           try {    
19.               PackageInfo packinfo = pm.getPackageInfo(packname, 0);    
20.               return packinfo.versionName;    
21.             } catch (NameNotFoundException e) {    
22.                 e.printStackTrace();    
23.             }    
24.     }    
25.     public String getAppName(String packname){    
26.           try {    
27.                  ApplicationInfo info = pm.getApplicationInfo(packname, 0);     
28.                  return info.loadLabel(pm).toString();    
29.             } catch (NameNotFoundException e) {    
30.                 // TODO Auto-generated catch block    
31.                 e.printStackTrace();    
32.             }    
33.     }    
34.     public String[] getAppPremission(String packname){    
35.           try {    
36.               PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_PERMISSIONS);    
37.               //擷取到所有的權限     
38.               return packinfo.requestedPermissions;    
39.             } catch (NameNotFoundException e) {    
40.                 e.printStackTrace();    
41.             }    
42.     }    
43.     public String getAppSignature(String packname){    
44.           try {    
45.               PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);    
46.               //擷取到所有的權限     
47.               return packinfo.signatures[0].toCharsString();    
48.             } catch (NameNotFoundException e) {    
49.                 e.printStackTrace();    
50.             }    
51.     }    
52. http://blog.csdn.net/yudajun/article/details/7855270