getVersionCode

public static int getVersionCode(Context ctx) {
    int versionCode = 0;

    try {
        PackageInfo pInfo = ctx.getPackageManager().getPackageInfo(
                ctx.getPackageName(), 0);
        versionCode = pInfo.versionCode;
    } catch (PackageManager.NameNotFoundException e) {
        e.printStackTrace();
    }

    return versionCode;
}