android判断应用是否有某个权限

android在开发中有时候要判断应用中是否有某项权限，或者想获取到某个应用的权限清单，可以使用以下方法

1) 判断应用是否具有某个权限

 PackageManager pm = getPackageManager();
         boolean permission = (PackageManager.PERMISSION_GRANTED ==
                 pm.checkPermission("android.permission.RECORD_AUDIO", "packageName"));
         if (permission) {
             showToast("有这个权限");
         }else {
             showToast("木有这个权限");
         }

2)获取某个应用的权限清单

 try {
             PackageInfo pack = pm.getPackageInfo("packageName",PackageManager.GET_PERMISSIONS);
             String[] permissionStrings = pack.requestedPermissions;
             showToast("权限清单--->" + permissionStrings.toString());
         } catch (NameNotFoundException e) {
             e.printStackTrace();
         }

 permissionStrings 是一个这样的字符串数组

 [android.permission.INTERNET,
          android.permission.READ_PHONE_STATE,
          android.permission.READ_CONTACTS,
          ……
          android.permission.READ_EXTERNAL_STORAGE,
          android.permission.READ_CALL_LOG,
          android.permission.WRITE_CALL_LOG]