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：

 PackageInfo info;
         try {
             info = this.getPackageManager().getPackageInfo(this.getPackageName(), 0);
             // 当前应用的版本名称
             String versionName = info.versionName;
             // 当前版本的版本号
             int versionCode = info.versionCode;
             // 当前版本的包名
             String packageNames = info.packageName;
         } catch (NameNotFoundException e) {
             e.printStackTrace();
         }

另一种方法：

 public class Info {
     Context context ;
     PackageManager pm ;
     public Info(Context context) {
         this.context = context;
         pm = context.getPackageManager();
     }
     /*
      * 获取程序 图标
      */
     public Drawable getAppIcon(String packname){
       try {
              ApplicationInfo info = pm.getApplicationInfo(packname, 0);
              return info.loadIcon(pm);
         } catch (NameNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();

         }
     }

     /*
      *获取程序的版本号
      */
     public String getAppVersion(String packname){

           try {
               PackageInfo packinfo = pm.getPackageInfo(packname, 0);
               return packinfo.versionName;
             } catch (NameNotFoundException e) {
                 e.printStackTrace();

             }
     }


     /*
      * 获取程序的名字
      */
     public String getAppName(String packname){
           try {
                  ApplicationInfo info = pm.getApplicationInfo(packname, 0);
                  return info.loadLabel(pm).toString();
             } catch (NameNotFoundException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();

             }
     }
     /*
      * 获取程序的权限
      */
     public String[] getAppPremission(String packname){
           try {
               PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_PERMISSIONS);
               //获取到所有的权限
               return packinfo.requestedPermissions;

             } catch (NameNotFoundException e) {
                 e.printStackTrace();

             }
     }


     /*
      * 获取程序的签名
      */
     public String getAppSignature(String packname){
           try {
               PackageInfo packinfo =    pm.getPackageInfo(packname, PackageManager.GET_SIGNATURES);
               //获取到所有的权限
               return packinfo.signatures[0].toCharsString();

             } catch (NameNotFoundException e) {
                 e.printStackTrace();

             }
     }

转载地址： http://blog.csdn.net/yudajun/article/details/7855270