Android 笔记

1. 检查权限

   private static boolean isPermissionGranted(String permission)
   {
       Context context = xx.getContext();
       return PackageManager.PERMISSION_GRANTED == context.checkCallingOrSelfPermission(permission);
   }
   private static boolean canAccessWifi()
   {
       return isPermissionGranted(Manifest.permission.ACCESS_WIFI_STATE);
   }