获取当前程序的版本号

private int getVersionCode() {
    try {
        //获取packagemanager的实例
        PackageManager packageManager = getPackageManager();
        //getPackageName()是你当前类的包名，0代表是获取版本信息
        PackageInfo packInfo = packageManager.getPackageInfo(getPackageName(), 0);
        Log.e("TAG", "版本号" + packInfo.versionCode);
        Log.e("TAG", "版本名" + packInfo.versionName);
        return packInfo.versionCode;
    } catch (Exception e) {
        e.printStackTrace();
    }

    return 1;
}