LocalCast

PackageManager pm = context.getPackageManager();
boolean isInstalled = isPackageInstalled("de.stefanpledl.localcast", pm);

if(isInstalled){
    openLocalcastPlayer(...);
}else{
    try {
        startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=de.stefanpledl.localcast")));
    } catch (android.content.ActivityNotFoundException ignored) {
        startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=de.stefanpledl.localcast")));
    }
}