String paketname="com.ramazan.rmosposx";

        Intent intent = getPackageManager().getLaunchIntentForPackage(paketname);
        if (intent != null) {
            // We found the activity now start the activity
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);
        } else {
            // Bring user to the market or let them choose an app?
            intent = new Intent(Intent.ACTION_VIEW);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setData(Uri.parse("market://details?id=" + paketname));
            startActivity(intent);
        }