Complete settings controls and refresh behavior

app/src/main/java/se/ajpanton/notificationlog/EventSettingsFragment.kt

@@ -1,6 +1,7 @@
 package se.ajpanton.notificationlog
 
 import android.os.Bundle
+import android.view.MotionEvent
 import android.view.View
 import android.widget.CheckBox
 import android.widget.LinearLayout
@@ -25,11 +26,36 @@ class EventSettingsFragment : Fragment(R.layout.fragment_event_settings) {
         store = LoggingRuleStore(requireContext())
         binding!!.pageTitle.setText(requireArguments().getInt(ARG_TITLE))
         bindRule()
-        binding!!.appListRefresh.setOnRefreshListener { reloadAppList(); binding!!.appListRefresh.isRefreshing = false }
+        binding!!.appListRefresh.setOnRefreshListener(::refreshAppList)
+        var touchStartY = 0f
+        val scroll = binding!!.appScroll
+        scroll.setOnTouchListener { _, event ->
+            when (event.actionMasked) {
+                MotionEvent.ACTION_DOWN -> touchStartY = event.y
+                MotionEvent.ACTION_UP -> {
+                    val atBottom = scroll.scrollY >= (scroll.getChildAt(0).height - scroll.height).coerceAtLeast(0)
+                    if (atBottom && event.y < touchStartY) {
+                        refreshAppList()
+                    }
+                }
+            }
+            false
+        }
     }
 
     override fun onDestroyView() { binding = null; super.onDestroyView() }
 
+    private fun refreshAppList() {
+        val currentBinding = binding ?: return
+        currentBinding.appListRefresh.isRefreshing = true
+        currentBinding.appListRefresh.post {
+            if (binding === currentBinding) {
+                reloadAppList()
+                currentBinding.appListRefresh.isRefreshing = false
+            }
+        }
+    }
+
     private fun bindRule() {
         val rule = store.ruleFor(type)
         listOf(