What you need to include in your project to start working:

• Open your AndroidManifest.xml and add inside application tag:

    <service
        android:name="com.adriankohls.bubble_overlay.BubbleOverlayService"
        android:enabled="true"
        android:exported="false" />
    <service
        android:name="com.adriankohls.bubble_overlay.BubbleVideoOverlayService"
        android:enabled="true"
        android:exported="false" />
  

And add this permissions at manifest top level:

    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />

Create a local variable in your dart file:

    final BubbleOverlay bubbleOverlay = BubbleOverlay();
    bubbleOverlay.openBubble();
    bubbleOverlay.openVideoBubble(uriString)

The first time you call openBubble()/openVideoBubble(), it will request Android overlay permission

After granting permission, call it again, and it will open the bubble

More details you can find in example/lib/main.dart

BubbleOverlayPlugin.kt: Make the 'talk' with Dart/Flutter with native Android OS, connect the OS with the Service, etc.

BubbleOverlayService.kt Updates Bubble data, all bubble data is parsed from XML file (layout_bubble.xml), as developing a native app for Android with XML

BubbleVideoOverlayService.kt Updates Bubble Video data, all bubble data is parsed from XML file (layout_video_bubble.xml), as developing a native app for Android with XML

Link: https://play.google.com/store/apps/details?id=com.adriankohls.bubble_overlay_example