如何检查是否Facebook正在安装的Andr​​oid

我修改我的应用程序能够赶上。这里是code我使用的：

I am modifying my app to be able to catch if a user tries to publish without having the facebook app installed (required for SSO). Here is the code I am using:

try{
    ApplicationInfo info = getPackageManager().
            getApplicationInfo("com.facebook.android", 0 );
    return true;
} catch( PackageManager.NameNotFoundException e ){
    return false;
}

的问题是，它总是捕捉错误。根据这个问题here,我需要请求相应的权限，但我不知道我需要请求哪些权限。

The problem is, it is always catching an error. According to the question here, I need to request the appropriate permission but I don't know what permissions I need to request.

是我的问题的允许一个或其他什么东西？

Is my problem a permission one or something else?