Mobile Dev

Learn how to calculate Stripe processing fees in Flutter when card country is unknown to ensure merchants receive exactly £10 while customers pay total amount including variable fees.

Learn how to make SwiftUI ScrollView ZStack background extend edge-to-edge ignoring safe area while VStack content respects it and scrolls seamlessly. Fix common iOS safe area bugs with code examples.

Resolve 'kotlin.Unit' incompatible version error in Kotlin Android Studio after adding Firebase Cloud Messaging Java service. Upgrade Kotlin to 2.1.20, align Gradle, AGP, Java 17 for firebase messaging compatibility.

Fix unresponsiveness in custom Jetpack Compose PlayerControls with ExoPlayer. Reduce recompositions from state updates, optimize pointerInput gestures, cache Canvas drawing for smooth playback and custom seekbars.

Step-by-step guide to starting Android applications and sending intents using ADB tools like adb shell am start. Covers setup, basic launches, data extras, troubleshooting for developers and testers.

Resolve Android Gradle build errors with duplicate META-INF/LICENSE files using merge instead of exclude. Preserve LeakCanary functionality while fixing build conflicts.

Resolve Xcode 6 Beta 4 crash: 'Unknown class in Interface Builder file' despite correct Storyboard links. Reset Module in Identity Inspector, check targets, and prevent issues for smooth iOS app launches.

Eliminate screen flicker when hiding AppBarLayout/SearchBar in Android WebView during scroll. Use NestedScrollView wrapper or NestedScrollWebView library for smooth Chrome/Opera-like behavior with CoordinatorLayout. Full code updates included.

Resolve npm error eresolve could not resolve in React Native after React Navigation updates for Google's 16kb rule. Upgrade to 7.x, install peer deps like reanimated, handle breaking changes, and test stability without app crashes.

Learn how to handle Stripe partial refunds for incomplete split payments with time limits in Flutter apps. Use PaymentIntents, flutter_stripe, cron jobs, webhooks, and Stripe refund API for auto-refunds on timeouts.

Discover why JavaScript can't open URLs from iOS WebView in Safari due to security limits. Learn native WKNavigationDelegate solutions, code examples, and best practices for external links in WKWebView.

Learn how to build an SMS/MMS messenger app like iMessage for offline communication with group messaging. Use Android SmsManager API, cloud gateways like Twilio, self-hosted solutions, or mesh networks for reliable messaging without internet.

Android MediaStore returns inconsistent casing like 'WhatsApp' vs 'whatsapp' for files in the same folder due to case-insensitive filesystems and scan snapshots. Normalize with canonical paths, LIKE queries, and RELATIVE_PATH for reliable WhatsApp media access.

Learn how to detect text changes in UITextField in iOS with immediate access to updated text. Explore delegate methods, notifications, and alternative approaches for real-time text handling.

Resolve 'The method 'fromJson' isn't defined for SubOne/SubTwo' in Flutter json_serializable nested classes. Add factory delegates with explicitToJson for self-referential lists. Full code, build_runner steps, and best practices.

Fix IconButton misalignment in Jetpack Compose rows despite Modifier.weight on inner Icon. Align perfectly with Text and Switch in grids by weighting the button and using fillMaxSize. Full code examples and tips.

Resolve red unresolved imports in KMM commonMain source set despite successful Gradle builds and runs. Fixes for Android Studio templates: add android.library plugin, enable metadata flags, correct Compose and coroutines deps for Kotlin 2.3.0.

Fix 'self captured by closure before members initialized' error in Swift class init when using DispatchWorkItem for macOS screen lock reminders. Use optional properties, helper methods, and [weak self] for cancel/reschedule without retain cycles.

Customize Expo Router swipe direction to mimic router.back() left-to-right animation on new screens using slide_from_left, gestureDirection: 'horizontal', and Stack options. Perfect for step-driven apps jumping to intermediary screens with intuitive back gestures.

Learn how to resolve Android installation errors using the android:installLocation manifest attribute to install apps on external storage.