Androidアプリのバージョン情報を入手

public class PackageUtils {
    /**
     *           
     */
    public static int getVersionCode(Context context) {
        try {
            PackageInfo packageInfo = context.getPackageManager()
                    .getPackageInfo(context.getPackageName(), 0);
            return packageInfo.versionCode;
        }
        catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
            return -1;
        }
    }

    /**
     *           
     */
    public static String getVersionName(Context context) {
        try {
            PackageInfo packageInfo = context.getPackageManager()
                    .getPackageInfo(context.getPackageName(), 0);
            return packageInfo.versionName;
        }
        catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
            return null;
        }
    }
}