Arindam Karmakar — Developer’s Log https://arindamxd.github.io/blogs/ Random code experiments, bugs I’ve squashed, and things I’m tinkering with. en-us Constructor injection on Android, and a graph at the Activity edge https://arindamxd.github.io/blogs/android-dependency-injection/ https://arindamxd.github.io/blogs/android-dependency-injection/ Tue, 12 May 2026 00:00:00 GMT Types you own should take constructors. Activities cannot. A handwritten graph, Hilt, or Koin fills that edge — they differ in whether a missing binding fails the build. Compile-time codegen on Android with annotation processors https://arindamxd.github.io/blogs/android-annotation-processors/ https://arindamxd.github.io/blogs/android-annotation-processors/ Wed, 28 Jan 2026 00:00:00 GMT Room and Dagger are annotation processors. The same javac hook can validate a type or write a Java file, without reflection and without shipping the annotation in the APK. Sharing Android and iOS logic with Kotlin Multiplatform https://arindamxd.github.io/blogs/kotlin-multiplatform-architecture/ https://arindamxd.github.io/blogs/kotlin-multiplatform-architecture/ Thu, 21 Aug 2025 00:00:00 GMT Android and iOS types do not travel. Kotlin Multiplatform holds up when you leave those couplings at the edge and give Swift an API it already knows how to subscribe to. Setting Up UPI Intent Launch and Opening UPI Apps from iOS https://arindamxd.github.io/blogs/upi-intent-launch-ios/ https://arindamxd.github.io/blogs/upi-intent-launch-ios/ Fri, 30 Aug 2024 00:00:00 GMT UPI (Unified Payments Interface) is a real-time payment system in India that allows users to transfer money instantly using their smartphones. To facilitate UPI payments, many apps have integrated UPI functionality. Unleashing Real-Time Communication in iOS Apps: WebRTC with Swift https://arindamxd.github.io/blogs/webrtc-with-swift-ios/ https://arindamxd.github.io/blogs/webrtc-with-swift-ios/ Tue, 02 Apr 2024 00:00:00 GMT Imagine adding video calls or even screen sharing to your app, without needing extra plugins or server gymnastics. That’s the magic of WebRTC (Web Real-Time Communication). It lets you create those features directly within your app, and Swift, with its clean code and modern feel, is a perfect fit for building this on iOS. UIControl on iOS: Target-Action, States, and Custom Controls https://arindamxd.github.io/blogs/ios-uicontrol-and-user-interaction/ https://arindamxd.github.io/blogs/ios-uicontrol-and-user-interaction/ Fri, 29 Mar 2024 00:00:00 GMT UIControl is UIKit’s base class for buttons, sliders, and switches. It owns control events, control states, and target-action — the same surface you use when you subclass it. Activity Context is the window, application Context is the process https://arindamxd.github.io/blogs/android-context/ https://arindamxd.github.io/blogs/android-context/ Mon, 14 Sep 2020 00:00:00 GMT Most Android APIs take a Context. Hold an Activity past the screen and you leak it; inflate from the application and you drop the theme.