fix: set/unset touchListener.owner onLoaded/onUnloaded (#6922)

tns-core-modules/ui/core/view/view.android.ts

@@ -57,13 +57,19 @@ function initializeTouchListener(): void {
 
     @Interfaces([android.view.View.OnTouchListener])
     class TouchListenerImpl extends java.lang.Object implements android.view.View.OnTouchListener {
-        constructor(private owner: View) {
+        private owner: WeakRef<View>;
+        constructor(owner: View) {
             super();
+            this.owner = new WeakRef(owner);
+
             return global.__native(this);
         }
 
         onTouch(view: android.view.View, event: android.view.MotionEvent): boolean {
-            const owner = this.owner;
+            const owner = this.owner.get();
+            if (!owner) {
+                return;
+            }
             owner.handleGestureTouch(event);
 
             let nativeView = owner.nativeViewProtected;
@@ -211,7 +217,7 @@ function initializeDialogFragment() {
             const owner = this.owner;
 
             if (owner) {
-                // Android calls onDestroy before onDismiss. 
+                // Android calls onDestroy before onDismiss.
                 // Make sure we unload first and then call _tearDownUI.
                 if (owner.isLoaded) {
                     owner.callUnloaded();
@@ -298,7 +304,7 @@ export class View extends ViewCommon {
             let view: View = this;
             let frameOrTabViewItemFound = false;
             while (view) {
-                // when interacting with nested fragments instead of using getSupportFragmentManager 
+                // when interacting with nested fragments instead of using getSupportFragmentManager
                 // we must always use getChildFragmentManager instead;
                 // we have three sources of fragments -- Frame fragments, TabViewItem fragments, and
                 // modal dialog fragments
@@ -1026,4 +1032,4 @@ createNativePercentLengthProperty({
 createNativePercentLengthProperty({
     setter: "_setMinHeightNative",
     get setPixels() { return org.nativescript.widgets.ViewHelper.setMinHeight }
-});
+});