start circular reveal animation for our image (from full size to 0 radius).hidden ImageView as in previous case with setting content of screen as Bitmap into it.Sounds hacky, though pretty working solution.Īlso with such a technique we can implement other different effects, for example we can implement old theme to disappear with revealing new theme underneath. This will create animation when new theme reveals with animation over old theme. start circular reveal animation for our content of the screen (from 0 radius to full size).convert content of Canvas into Bitmap and put it into ImageView.
we have some hidden ImageView on the screen.But to provide a really good UX it seems without custom theming we’ll not be able to achieve what we want. Basic support for Dark Theme with app restart is fine and is better than only providing just light theme. That is clearly not the solution we are looking for.
The issue is that it is part of configuration and Android UI Toolkit doesn’t allow to change configuration dynamically and to change theme it is needed to restart all the activities in the app. In Android 9 we have native Dark Theme support. There is a lot of code, so let’s get the idea of the whole algorithm. Thanks to developers of Telegram app for making code open sourced, so we can take a look at how developers implemented this feature in the repository (lines highlighted). Though in this article we’ll try to get some simple solution for dynamic customization. Hopefully with help of Jetpack Compose we’ll get more adequate dynamic theming and implementation of such a feature will be more straightforward.
If your app is small, then there is no actual need for investing time into implementing your custom views. To implement such a feature one need to have custom views with custom theming support in the app. And in this article we’ll go into how to implement such functionality in your app.ĭisclaimer: Android UI Toolkit currently is pretty bad, especially in dynamic styling. Android Change Theme Programmatically Getting StartedĪdd the JitPack repository to your root build.After that in different modifications such feature started to appear in other apps, for example VK.
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