Floating View crashes on Android O

[Xlythe]

08-16 09:18:14.943 15206 15206 E AndroidRuntime: FATAL EXCEPTION: main
08-16 09:18:14.943 15206 15206 E AndroidRuntime: Process: com.android2.calculator3, PID: 15206
08-16 09:18:14.943 15206 15206 E AndroidRuntime: java.lang.RuntimeException: Unable to create service com.xlythe.calculator.material.floating.FloatingCalculator: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@2c9cd54 -- permission denied for window type 2002
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:3414)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.app.ActivityThread.-wrap4(Unknown Source:0)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1683)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:105)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.os.Looper.loop(Looper.java:164)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:6541)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: Caused by: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@2c9cd54 -- permission denied for window type 2002
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.view.ViewRootImpl.setView(ViewRootImpl.java:789)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:356)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:92)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at com.xlythe.view.floating.FloatingView.onCreate(FloatingView.java:160)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at com.xlythe.calculator.material.floating.FloatingCalculator.onCreate(FloatingCalculator.java:55)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: at android.app.ActivityThread.handleCreateService(ActivityThread.java:3404)
08-16 09:18:14.943 15206 15206 E AndroidRuntime: ... 8 more

[lupsaa]

This should fix it: https://stackoverflow.com/a/47103959/2154462