Open Fb page in app

public static Intent getOpenFacebookIntent(Context context) {
    try {
        context.getPackageManager().getPackageInfo("com.facebook.katana", 0);
        return new Intent(Intent.ACTION_VIEW, Uri.parse("fb://page/<id_here>"));
    } catch (Exception e) {
        return new Intent(Intent.ACTION_VIEW,Uri.parse("https://www.facebook.com/<user_name_here>"));
    }
}

==============

switch(v.getId()){

    case: R.id.btn:

    startActivity(getOpenFacebookIntent());

    break;

}