drawerLayoutContainer.draw(canvas)) was not a viable option with our codebase. I began experimenting with implementing the feature in PDF Viewer for Android, and it became immediately clear that obtaining a screenshot by using a draw call on a canvas (i.e. Once you understand the key concepts, the code is rather simple. ℹ️ Note: The moment when the theme changes (step number 4), the layout will have the ImageView on top, covering the new theme the only change that can be visually perceived in this step will be that of the navigation bar, because it is positioned outside of the area covered by the ImageView. Make the ImageView invisible, setting its state as GONE. Set the screenshot as an image bitmap in an ImageView that covers the entire window.Īpply the circular reveal effect to the drawer layout container. Once the transition starts, here is the logic: The entire algorithm can be easily unraveled with the use of two key steps: taking a screenshot of the window, and using ViewAnimationUtils#createCircularReveal(). The reason for all this interest is due to the complexity of the Android theme system. In fact, there are many subreddits on the topic asking for information about the technique used. The introduction of this animation was warmly welcomed by the Android community. Then I’ll try to apply it to PDF Viewer for Android. In this article, I’ll delve into the process of achieving this fancy transition, beginning with the concepts and ending with the actual implementation. Luckily for us, the source code is available on GitHub, so we can take a closer look at how the effect is achieved. In its most recent update, the Telegram app for Android introduced an eye-catching animation that happens when users change the theme.
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