play new media if selected while player is in pip & minor code clean up

move some player avtivity stuff to ActivityUtils

app/src/main/java/org/mosad/teapod/util/ActivityUtils.kt

@@ -0,0 +1,57 @@
+package org.mosad.teapod.util
+
+import android.app.Activity
+import android.app.ActivityManager
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.view.View
+import android.view.WindowInsets
+import android.view.WindowInsetsController
+
+/**
+ * hide the status and navigation bar
+ */
+fun Activity.hideBars() {
+    window.apply {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+            setDecorFitsSystemWindows(false)
+            insetsController?.apply {
+                hide(WindowInsets.Type.statusBars() or WindowInsets.Type.navigationBars())
+                systemBarsBehavior = WindowInsetsController.BEHAVIOR_SHOW_BARS_BY_SWIPE
+            }
+        } else {
+            @Suppress("deprecation")
+            decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_IMMERSIVE
+                    or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+                    or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+                    or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+                    or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+                    or View.SYSTEM_UI_FLAG_FULLSCREEN)
+        }
+    }
+}
+
+fun Activity.isInPiPMode(): Boolean {
+    return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        isInPictureInPictureMode
+    } else {
+        false // pip mode not supported
+    }
+}
+
+/**
+ * Bring up launcher task to front
+ */
+fun Activity.navToLauncherTask() {
+    val activityManager = (getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager)
+    activityManager.appTasks.forEach { task ->
+        val baseIntent = task.taskInfo.baseIntent
+        val categories = baseIntent.categories
+        if (categories != null && categories.contains(Intent.CATEGORY_LAUNCHER)) {
+            task.moveToFront()
+            return
+        }
+    }
+}
+