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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Mobile Development’ Category

Android passwords: store as transient as possible using arrays in stead of strings

Posted by jpluimers on 2020/08/06

Sometimes you cannot avoid handling passwords in your application. When you do,

  • keep them around as short as possible
  • store them in data types that are not garbage collected
  • wipe the storage as soon as you are done

In practice, this usually comes down to storing them as arrays (character or byte arrays), not strings.

This holds for many other platforms outside Java as well: strings are usually managed in one way or the other, so they cannot be wiped


For actual storage of passwords, you always have the risk of retrieval: when a “bad guy” gets physical access to a device, it is basically hosed.

A KeyStore can only do so much against it: if your APK can be downloaded, it can be reverse-engineered revealing the exact steps how the store is accessed, reproducing the steps needed to hack into the underlying protected data/functionality.

The keystore can be forgetful…

You’ve just moved in to a new house and have been given the master key for the front door. You only have one of these so you know you need to keep it safe. Your really paranoid so you hire an armed guard, whose sole job is to protect this key, in fact, this is all he has been trained to do and has a catchy slogan of “need to protect a key, its what I was born to do!”. You install an extra lock on your front door as you feel the bodyguard isn’t enough, this is a rough area anyway and who’s going to make sure no-ones about to break in and steal all your crap. You return to your key guard only to be informed he has thrown the key away. You shout and scream at him but he just blankly says “I don’t have it anymore, I didn’t think it was important”. You can’t contain your anger “What the hell, your a jerk! You had one thing to do and you failed, this causes me a lot of problems, why didn’t you tell me you might do this?! What do I do now?!”

[WayBack] Android Security: The Forgetful Keystore – SystemDotRun – Dorian Cussen’s Super Blog


Posted in Android, Development, Java, Java Platform, Mobile Development, Power User, Security, Software Development | Leave a Comment »

Best android apps for zabbix – AndroidMeta

Posted by jpluimers on 2020/05/28

If I land a project using Zabbix again, one of the things I need to look into is [WayBackBest android apps for zabbix – AndroidMeta.


Posted in *nix, Android, Android Devices, Development, Linux, Mobile Development, Monitoring, Power User, Zabbix | Leave a Comment »

appletv – How can I show a read-only version of Google Calendar on Apple TV 4th generation? – Ask Different

Posted by jpluimers on 2020/05/14

Two calendars and three weather frames.Based on [WayBack] appletv – How can I show a read-only version of Google Calendar on Apple TV 4th generation? – Ask Different there is one choice that might work on Apple TV 3rd generation and 4th generation:

This is the only practical solution I dissected from [WayBackHow to surf the web and use Safari on Apple TV – Macworld UK: Here is how to browse the internet and watch web services on your Apple TV.

Installing requires a few steps as described at

Limiting to only Apple TV 4, another solution is also possible:

However the last solution is not a real web browser, so it does not allow a layout I’m using for the calendar, or actually two calendars:

  • weekly calendar on the left so my brother sees his detailed activities for the upcoming days
  • monthly calendar on the top right for an overview of the past and upcoming weeks
  • three weather frames on the bottom right with two weather radars from different sources and a weather overview for the upcoming days

The reason I need this is because my brother is mentally retarded having problems with abstract concepts like relative time and scheduling. Like me he is also easily distracted and not good at repeating tasks. So looking at a schedule at least once a day is tough for him.

He is very good at concrete topics, especially ones he can put to practice right away like “will it rain on my way to work”. That makes him look at this web page in the first place.

Currently this calendar is shown on a monitor by a Raspberry Pi attached to it.

But I might go for the Apple TV 3 route later on.


Posted in Apple, Apple TV, Development, iOS, iOS Development, Mobile Development, Power User | Leave a Comment »

SMS Backup+ – Apps on Google Play

Posted by jpluimers on 2020/03/04

Simple but cool app: [Archive.isSMS Backup+ – Apps on Google Play:

Automatically backup your SMS, MMS and call history with a separate label in Gmail and Google Calendar.

Later you can restore the saved data (except MMS) back to the phone, especially useful when switching to a new device.

IMAP access needs to be manually enabled in Gmail, see the website and FAQ for more information. You can of course use your own IMAP server for backups, giving you full control over your data.

SMS Backup+ is a free open-source project which has been in active development since the early days of Android, completely ad and tracking-free, supported through voluntary donations.

Sourcecode: [WayBack] GitHub – jberkel/sms-backup-plus: Backup Android SMS, MMS and call log to Gmail / Gcal / IMAP

Via: [WayBack] Wirre Telefongespräche für 500. Ich kriege ja nicht mehr oft Anrufe auf der deutschen Telefonnummer, und so liegt das Telefon jetzt daheim und hängt am… – Kristian Köhntopp – Google+


Posted in Android, Development, Mobile Development, Software Development | Leave a Comment »

Commander One review: A superior alternative to Android File Transfer on Mac

Posted by jpluimers on 2020/01/10

On my list of software to try: [WayBackCommander One review: A superior alternative to Android File Transfer on Mac

Via: [WayBack] Looks like a must-have for anyone using a Mac (with MacOS) and an Android phone. – Roderick Gadellaa – Google+


Posted in Android, Android Devices, Apple, Development, iMac, Mac, Mac OS X / OS X / MacOS, MacBook, MacBook Retina, MacBook-Air, MacBook-Pro, MacMini, macOS 10.12 Sierra, macOS 10.13 High Sierra, Mobile Development, Software Development | Leave a Comment »

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