![]() Make a new layout file in your project named dialer.xml (res>layout>dialer.xml). ![]() Make a new application in android studio. ![]() I’m assuming that you already know how to make a new project in Android studio. But before the system will let you know about any call, the user must first choose your app as the default Phone app, and you need to make it available to him as such. The app will be making calls and requesting ussd code to know the information of your sim network. One is to implement an InCallService that Android will use to notify you about events related to the calls. 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). Which android app can automatically dial a phone number (from a list) right after I finish making a phone call 2 Answers. 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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