代码获取Android的VersionCode跟VersionName信息

VersionCode升级App版本时用，VersionName显示给用户。

    /**     * get App versionCode     * @param context     * @return     */    public String getVersionCode(Context context){        PackageManager packageManager=context.getPackageManager();        PackageInfo packageInfo;        String versionCode="";        try {            packageInfo=packageManager.getPackageInfo(context.getPackageName(),0);            versionCode=packageInfo.versionCode+"";        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        return versionCode;    }    /**     * get App versionName     * @param context     * @return     */    public String getVersionName(Context context){        PackageManager packageManager=context.getPackageManager();        PackageInfo packageInfo;        String versionName="";        try {            packageInfo=packageManager.getPackageInfo(context.getPackageName(),0);            versionName=packageInfo.versionName;        } catch (PackageManager.NameNotFoundException e) {            e.printStackTrace();        }        return versionName;    }