Android: Unable to add window. Permission denied for this window type

by

if you use apiLevel >= 19, don’t use

WindowManager.LayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT

which gets the following error:

android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@40ec8528 — permission denied for this window type

Use this instead:

LayoutParams.TYPE_TOAST or TYPE_APPLICATION_PANEL

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