Anatomy of the System Bars: Status Bar and Navigation Bar in Flutter, Jetpack Compose and SwiftUI
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Anatomy of the System Bars: Status Bar and Navigation Bar in Flutter, Jetpack Compose and SwiftUI

I have had App Store submissions rejected over status bar contrast. How the status bar, the navigation bar and the home indicator work, what edge-to-edge changed on Android, and how to configure each bar in Flutter, Jetpack Compose and SwiftUI.

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Flutter Widgetbook: How to Document your Design System the Right Way!
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Flutter Widgetbook: How to Document your Design System the Right Way!

How Widgetbook solves the documentation problem in Flutter projects with a custom design system. On Direção Fácil, it became a visual catalog, a contract with Figma, and precise context for Claude Code to generate screens using the right widgets.

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Why Your API Key in Mobile Apps Needs to Be Restricted (Even When It Looks Like It Doesn't)
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Why Your API Key in Mobile Apps Needs to Be Restricted (Even When It Looks Like It Doesn't)

I pulled two working Google Maps API keys out of mobile apps in under a minute, both with no restrictions at all. Both reports were closed as Informative on HackerOne. Here is the extraction with apktool, the endpoint validation, and the three layers that actually fix it.

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Account Takeover in Mobile Apps: How a Deep Link Became a Major Attack Vector
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Account Takeover in Mobile Apps: How a Deep Link Became a Major Attack Vector

A deep link that accepted any URL opened my page inside a WebView, and the native bridge handed over the user's JWT without checking the origin. From reverse engineering to the PoC, the bug bounty report and what to fix.

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Creating an AI Agent in Claude Code to Control my Smartphone
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Creating an AI Agent in Claude Code to Control my Smartphone

Automating Android app documentation and testing with an AI agent in Claude Code, wired to an MCP server that drives a real device over ADB.

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Enhancing User Experience with Keyboards on iOS using Keyboard Actions
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Enhancing User Experience with Keyboards on iOS using Keyboard Actions

You'll never struggle with the iOS Keyboard in Flutter again! See how to solve a common problem in mobile apps for iOS that is…

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Creating an Image Editor with Flutter - CAM Covers (From Idea to Reality)
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Creating an Image Editor with Flutter - CAM Covers (From Idea to Reality)

How I created an image editing app with Flutter. See the challenges, solutions, and monetization of CAM Covers, an album cover editor.

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Creating Apps for Android Wear OS with Jetpack Compose
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Creating Apps for Android Wear OS with Jetpack Compose

A practical guide on how to develop apps for Android Wear OS using the modern Jetpack Compose toolkit.

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