A way of showing a PIP window on all apps

PIPExample.kt

val windowManager = this.getSystemService(Context.WINDOW_SERVICE) as WindowManager
val windowLayoutParams = WindowManager.LayoutParams()
windowLayoutParams.width = 300
windowLayoutParams.height = 300
windowLayoutParams.x = 400
windowLayoutParams.y = 400
windowLayoutParams.format = PixelFormat.TRANSLUCENT
windowLayoutParams.gravity = Gravity.TOP or Gravity.LEFT
if (Build.VERSION.SDK_INT >= 26)
  windowLayoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
else
  windowLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT
windowLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE or WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED

val texture = TextureView(this)   //A simple TextureView to show video in
val frame = FrameLayout(this).apply {
  addView(texture, -1, -1)
}
windowManager.addView(frame, windowLayoutParams)    //Displaying the window

player.setVideoTextureView(texture)   //Connect it to exoplayer