Android Dev - The internals of Android Stack Architecture - Article

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• The internals of Android Stack Architecture - Article
• How to Implement a PDF Viewer in Your App Using PdfRenderer and ViewPager2
• Smaller APKs with resource optimization - Jake Wharton
• Kotlin Multiplatform Mobile goes Alpha – Kotlin Blog
• Play store policy violations is riddled
• Android Feature Development at Babylon Health — Part 2: From Designs to Architecture
• What does this mean for Indian dev? Does everyone need GDTIN now?
• Funny how Admob Policy Issues have Issues too =)
• Android vs iOS development time
• Android Studio 3.0.1 errors; learning via an online course
• Updated Cloud Firestore Operations over Firebase update 0.14+2!⚡
• Template for Smooth navigation menu like the one slack uses ?
• Android WebView Developer Satisfaction Research
• TextSwitcher Jetpack Compose
• Keep Your Regular Expression Escapes in Android
• A comprehensive list of learning resources for understanding Jetpack Compose in Android.
• Am I wasting my time with Flutter?
• Could you recommend me a smartphone to develop?
• Lambda expressions in Kotlin
• How to append further data to preexisting Date object?
• Jetpack ViewModel != viewmodel (MVVM)?
• Users are getting more and more pissed off at Admob interstitial ads that have no way of exiting them. Anyone else?
• Android Studio does not run maximized?

The internals of Android Stack Architecture - Article Posted: 01 Sep 2020 07:21 AM PDT Table of Contents Early Days of Android Android Stack Linux Kernel Secure Element Hardware abstraction layer Native Libraries Runtime Framework Apps References Understanding the internals of Android Stack Architecture and how it relates to Linux blog post aims to be the starting point for developers to get familiar and have an overview of core components in the Android Stack Architecture. Early Days of Android Founded in 2003, Android Inc, in the early days began as an operating system for Digital Cameras. Due to the low market for Digital Cameras, the Android Inc teams' intentions slowly diverted to Mobile Devices. Becoming the rivals of then Symbian and Windows Mobile. Acquired by Google in 2005, the development team worked on an Operating System based on Linux Kernel in shadows until the unveil of Open Handset Alliance in 2007. https://preview.redd.it/wjoa0sysojk51.png?width=1280&format=png&auto=webp&s=fd78d0546420b115f5f32acad6c093bfc4688f81 Android Stack By Google, Android is described officially as an open-source,Linux-based software stack created for a wide array of devices and form factors. The graphical user interface environment, middlewares, libraries, APIs... sitting on top of Linux Kernel and shell binaries are Software Stack Layers that make the bulk of Android and which makes it much more than a variation of the Linux system. https://preview.redd.it/jcmf41nuojk51.png?width=1280&format=png&auto=webp&s=3cf4d97d8a32277f6ec8faf1634a3ec6e9e87b98 Linux Kernel Android's Kernel is based on the Long Term Support (LTS) branches of the Linux Kernel. The kernel provides drivers for filesystem access, process management, hardware, networking. The Android Kernel differs from vanilla Linux Kernel due to the differences called as Androidisms Some of the notable Androidisms added to Kernel are IPC Binder, Wavelocks, Low-Memory Killer, Dalvik, and Android Runtime, Anonymous Shared Memory (ashmem), Alarm, paranoid network, RAM console, Physical memory (pmem), Sync driver, Timed Output, and GPIO, memory and logging enhancements. Android utilizes many unused/less-popular features in desktop distributions of Linux such as control groups, Low Memory Killer Daemon, Security-Enhanced Linux (SELinux), and open source projects like a racoon for VPN, mdns for network service discovery, and many more. https://preview.redd.it/j2cq9uhxojk51.png?width=1280&format=png&auto=webp&s=ec4bc88f683efe190610532db27e9b3e83f781e3 Secure Element To provide better security, some devices have an embedded Secure Element (SE), which is dedicated, separate tamper-resistant hardware to store cryptographic data. Hardware abstraction layer Android runs on TV, Mobile, Refrigerator and almost everywhere that the underlying hardware may greatly differ in its' scope and support. To solve this the Android stack typically relies on shared libraries provided by manufacturers to interact with hardware. Android relies on what can be considered a Hardware Abstraction Layer (HAL), although the interface, behavior, and function of abstracted hardware components differ greatly from type to type. The idea of GPS, sensor, TV, camera, audio, input media components and other components behavior is defined by HAL and how it should behave in Android. The vendors are still not allowed to make unnecessary modifications so as to not fail the Compatibility Test Suite, Vendor Test Suite. https://preview.redd.it/3xx6e0z0pjk51.png?width=1280&format=png&auto=webp&s=a190299b4aba07053e67fd2df69e66222582b4ea Native Libraries The native libraries layer is responsible for providing support for the core features. The WebKit Web rendering engine, Audio Manager, LIBC, Secure Sockets Layer (SSL), FreeType for rendering fonts, Media, OpenGL ES graphics API, SQLite database, Surface Manager. https://preview.redd.it/hmiokov4pjk51.png?width=1280&format=png&auto=webp&s=e40d6a952df4d26ed3e9e2951dd3ed98d4c9c652 Runtime Before Android 4.4, each Android app would run on its own virtual machine, which is called "Dalvik" which got superseded by the Android RunTime (ART).In Android 4.4, along with Dalvik, Google experimentally introduced a new Android Runtime called "ART" which still today remains the standard. ART introduces ahead-of-time (AOT) compilation, which can improve app performance. App runs and launches faster on ART than Dalvik because DEX bytecode gets translated into machine code during installation which means no compilation during runtime and thus seemingly faster! Because Dalvik requires extra memory for Just-in-time code cache, an app occupies a smaller memory footprint when it runs on ART." https://preview.redd.it/x8b29li6pjk51.png?width=1280&format=png&auto=webp&s=028cf01c7fa5b66d7b926a1434a697530941457b Framework The Android application creation process is provided by Application frameworks/libraries which allows developers to use the higher-level Kotlin or Java language, rather than low-level C/C++. The framework includes the basic blocks for building Android applications such as Content Provider, Activity Manager, Location Manager, View System, Package Manager, Notification Manager, Resource Manager, Telephony Manager, Window Manager. Android frameworks are divided into separate namespaces using the Java package naming and according to their functionality. Packages in the android.* namespace is available for use by developers. Packages in com.android.* are internal. Android also supports most of the standard Java runtime packages in the java.* namespace. https://preview.redd.it/9vhtlhu8pjk51.png?width=1280&format=png&auto=webp&s=feab2c94bfda06af4c0ae0ac051cd1d1772feccc Apps The topmost layer in the Android Stack is the Applications layer which can be categorized into System apps and user-installed apps. System apps cannot be uninstalled or changed by users and are read-only in production devices. System apps are included in the OS image, mounted as /system User-installed apps can be uninstalled at will. Each application lives in a dedicated security sandbox and cannot affect other applications or access their data. User-installed apps are installed on a dedicated read-write partition, mounted as /data that host user data. https://preview.redd.it/09tg4sv9pjk51.png?width=1280&format=png&auto=webp&s=8a75bf2267c51eba9d18628a7dc7a4b1727f7db3 References https://developer.android.com/guide/platform https://source.android.com https://en.wikipedia.org/wiki/Android_(operating_system)) https://software.intel.com/content/www/us/en/develop/blogs/art-vs-dalvik-introducing-the-new-android-x86-runtime.html Android Internals::A Confectioner's Cookbook Android Security Internals: An In-Depth Guide to Android's Security Architecture Embedded Android: Porting, Extending, and Customizing by androiddevnotes on GitHub 🐣 submitted by /u/jiayounokim [link] [comments]

How to Implement a PDF Viewer in Your App Using PdfRenderer and ViewPager2 Posted: 01 Sep 2020 12:22 AM PDT submitted by /u/AleSpero [link] [comments]

Smaller APKs with resource optimization - Jake Wharton Posted: 01 Sep 2020 06:31 AM PDT submitted by /u/dayanruben [link] [comments]

Kotlin Multiplatform Mobile goes Alpha – Kotlin Blog Posted: 31 Aug 2020 10:07 AM PDT submitted by /u/dayanruben [link] [comments]

Play store policy violations is riddled Posted: 01 Sep 2020 07:32 AM PDT 1) Imitate famous person 2) Identity imitation Actually these are a reason for an app to be deleted immediately. How millions were downloaded when even one of them was enough to delete account. I think google overlooks some application violations. Or there's someone on google who doesn't do their job. https://play.google.com/store/apps/details?id=com.playfake.instafake.funsta https://play.google.com/store/apps/details?id=com.faketweetcreator.tweeteditorfortweeter https://play.google.com/store/apps/details?id=com.amegodev.fakecommentfb submitted by /u/scoutapps [link] [comments]

Android Feature Development at Babylon Health — Part 2: From Designs to Architecture Posted: 01 Sep 2020 04:45 AM PDT submitted by /u/AthertonD [link] [comments]

What does this mean for Indian dev? Does everyone need GDTIN now? Posted: 01 Sep 2020 02:14 AM PDT submitted by /u/slipperySquidd [link] [comments]

Funny how Admob Policy Issues have Issues too =) Posted: 01 Sep 2020 08:10 AM PDT submitted by /u/lixa0 [link] [comments]

Android vs iOS development time Posted: 01 Sep 2020 07:51 AM PDT Am doing a Twitter poll to see which platform requires more development time. Would appreciate if you could help. My work is being scrutinised because I'm constantly behind compared to the iOS developer. Cheers! https://twitter.com/zboarda/status/1300792539415445510 submitted by /u/zboarda [link] [comments]

Android Studio 3.0.1 errors; learning via an online course Posted: 01 Sep 2020 01:42 AM PDT I'm using the "The Complete Android Oreo Developer Course - Build 23 Apps!" course on Udemy to learn to make apps; never done anything like this before so I'm as green as can be. The program I'm using is Android Studio. I'm stuck because of the errors in the image, and this is before I've even started using it. I'm using version 3.0.1 as that's the version in the course, and I was advised that "The errors on the original version will have taken you through the issue and provided links to what needed updating..." but I don't see how to do that. Can anyone assist with the errors so I can hopefully start using this and learning? Android Studio 3.0.1 errors submitted by /u/Brodner [link] [comments]

Updated Cloud Firestore Operations over Firebase update 0.14+2!⚡ Posted: 01 Sep 2020 03:32 AM PDT submitted by /u/abhishvekpvt [link] [comments]

Template for Smooth navigation menu like the one slack uses ? Posted: 01 Sep 2020 07:06 AM PDT Anyone with some template(Kotlin,java) to create a smooth navigation menu like the one slack uses ? submitted by /u/stevebaros [link] [comments]

Android WebView Developer Satisfaction Research Posted: 01 Sep 2020 02:32 AM PDT submitted by /u/pmz [link] [comments]

TextSwitcher Jetpack Compose Posted: 01 Sep 2020 05:55 AM PDT Does anyone knows how i could create the TextSwitcher element from the Android standard library using Jetpack Compose? With in and out animation? submitted by /u/danieldaeschle [link] [comments]

Keep Your Regular Expression Escapes in Android Posted: 31 Aug 2020 07:02 PM PDT submitted by /u/ElyeProj [link] [comments]

A comprehensive list of learning resources for understanding Jetpack Compose in Android. Posted: 31 Aug 2020 01:10 PM PDT submitted by /u/jiayounokim [link] [comments]

Am I wasting my time with Flutter? Posted: 31 Aug 2020 12:32 PM PDT At my new work they want me to also contribute to Flutter. I want to spend most of my time getting experience in Android native. That's what I'm working on, yet they want to pull me into Flutter too. Is this a red flag and should I look elsewhere for work, or is it a good skill to have? submitted by /u/OmniPhoenikks [link] [comments]

Could you recommend me a smartphone to develop? Posted: 01 Sep 2020 03:50 AM PDT Hi everyone, I'm quite new to the world of Android development so I have to buy a new smartphone just for development. Could you recommend one for me? The budget is € 200-250 submitted by /u/limdev92 [link] [comments]

Lambda expressions in Kotlin Posted: 01 Sep 2020 01:26 AM PDT submitted by /u/cheerfulboy [link] [comments]

How to append further data to preexisting Date object? Posted: 01 Sep 2020 01:18 AM PDT In my Reminder app, I have both DatePickerDialog and TimePickerDialog that the user can set the date and time, in no particular order. I also have a button for saving the date and time (obviously); my question is if it's possible to put the 'date' data first (YEAR, MONTH, DAY_MONTH) in a Date object then later 'append' the 'time' data (HOUR_OF_DAY, MINUTE) in that same Date object, or vice versa, depends on whatever gets called first, OnDateSet or OnTimeSet, based on user action. Is this possible? If not, may I get advice on how to implement this (elegantly)? Thanks. submitted by /u/luhsya [link] [comments]

Jetpack ViewModel != viewmodel (MVVM)? Posted: 31 Aug 2020 12:15 PM PDT Awhile back when I first got into Android development, I remember reading that the Jetpack ViewModel is not the same as the viewmodel in the MVVM design pattern. I don't really understand how are they different. The viewmodel in MVVM seems to be the bridge between the model and the view. The Jetpack ViewModel is doing exact is it not? submitted by /u/SnooOwls9317 [link] [comments]

Users are getting more and more pissed off at Admob interstitial ads that have no way of exiting them. Anyone else? Posted: 31 Aug 2020 02:58 PM PDT submitted by /u/whatappdev [link] [comments]

Android Studio does not run maximized? Posted: 31 Aug 2020 12:28 PM PDT So I noticed that whenever I open a project, the window is never maximized and I have to do it manually every single time. I've tried setting run to maximize (open file location => properties => run => maximized) and it still doesn't work. Does anyone know how to solve this? submitted by /u/xStrafez_ [link] [comments]

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