There are two steps an app has to make to show its own UI during an ongoing call. This app uses minSdkVersion 23, because that's when the APIs supporting this were added. It was created to address the lack of good documentation, evidenced by multiple questions on stackoverflow (1), (2). This project shows the absolute minimum an Android Phone app needs to implement to replace the native phone app and provide the UI when making calls. This is converted from Kotlin to Java version of Arek Olek's project
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