fix(android): ScrollView BadParcelableException

packages/ui-mobile-base/android/widgets/src/main/java/org/nativescript/widgets/GridLayout.java

@@ -223,8 +223,9 @@ private void addToMap(View child) {
 	}
 
 	private void removeFromMap(View child) {
-		this.map.get(child).child = null;
-		this.map.remove(child);
+		if (this.map.containsKey(child)) {
+			this.map.remove(child).child = null;
+		}
 	}
 
 	@Override

packages/ui-mobile-base/android/widgets/src/main/java/org/nativescript/widgets/HorizontalScrollView.java

@@ -2,17 +2,13 @@
 
 import android.content.Context;
 import android.graphics.Rect;
-import android.os.Parcel;
 import android.os.Parcelable;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
-import android.view.ViewParent;
 import android.widget.FrameLayout;
 
-import androidx.annotation.NonNull;
-
 /**
  * @author hhristov
  */
@@ -23,7 +19,7 @@ public class HorizontalScrollView extends android.widget.HorizontalScrollView {
 	private int contentMeasuredWidth = 0;
 	private int contentMeasuredHeight = 0;
 	private int scrollableLength = 0;
-	private SavedState mSavedState;
+	private ScrollSavedState mSavedState;
 	private boolean isFirstLayout = true;
 	private boolean scrollEnabled = true;
 
@@ -180,7 +176,7 @@ protected void onLayout(boolean changed, int left, int top, int right, int botto
 
 		this.mIsLayoutDirty = false;
 		// Give a child focus if it needs it
-		if (this.mChildToScrollTo != null && isViewDescendantOf(this.mChildToScrollTo, this)) {
+		if (this.mChildToScrollTo != null && Utils.isViewDescendantOf(this.mChildToScrollTo, this)) {
 			this.scrollToChild(this.mChildToScrollTo);
 		}
 
@@ -194,7 +190,7 @@ protected void onLayout(boolean changed, int left, int top, int right, int botto
 
 			final int scrollRange = Math.max(0, childWidth - (right - left - this.getPaddingLeft() - this.getPaddingRight()));
 			if (this.mSavedState != null) {
-				scrollX = (this.isLayoutRtl() == mSavedState.isLayoutRtl) ? mSavedState.scrollPosition : (scrollRange - this.mSavedState.scrollPosition);
+				scrollX = this.isLayoutRtl() ? scrollRange - mSavedState.scrollOffsetFromStart : mSavedState.scrollOffsetFromStart;
 				mSavedState = null;
 			} else {
 				if (this.isLayoutRtl()) {
@@ -228,7 +224,7 @@ protected void onDetachedFromWindow() {
 
 	@Override
 	protected void onRestoreInstanceState(Parcelable state) {
-		SavedState ss = (SavedState) state;
+		ScrollSavedState ss = (ScrollSavedState) state;
 		super.onRestoreInstanceState(ss.getSuperState());
 		this.mSavedState = ss;
 		this.requestLayout();
@@ -237,9 +233,8 @@ protected void onRestoreInstanceState(Parcelable state) {
 	@Override
 	protected Parcelable onSaveInstanceState() {
 		Parcelable superState = super.onSaveInstanceState();
-		SavedState ss = new SavedState(superState);
-		ss.scrollPosition = this.getScrollX();
-		ss.isLayoutRtl = this.isLayoutRtl();
+		ScrollSavedState ss = new ScrollSavedState(superState);
+		ss.scrollOffsetFromStart = isLayoutRtl() ? -this.getScrollX() : this.getScrollX();
 		return ss;
 	}
 
@@ -258,58 +253,4 @@ private void scrollToChild(View child) {
 	private boolean isLayoutRtl() {
 		return (this.getLayoutDirection() == LAYOUT_DIRECTION_RTL);
 	}
-
-	/**
-	 * Return true if child is a descendant of parent, (or equal to the parent).
-	 */
-	static boolean isViewDescendantOf(View child, View parent) {
-		if (child == parent) {
-			return true;
-		}
-
-		final ViewParent theParent = child.getParent();
-		return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent);
-	}
-
-	static class SavedState extends BaseSavedState {
-		public int scrollPosition;
-		public boolean isLayoutRtl;
-
-		SavedState(Parcelable superState) {
-			super(superState);
-		}
-
-		public SavedState(Parcel source) {
-			super(source);
-			scrollPosition = source.readInt();
-			isLayoutRtl = source.readInt() == 0;
-		}
-
-		@Override
-		public void writeToParcel(Parcel dest, int flags) {
-			super.writeToParcel(dest, flags);
-			dest.writeInt(scrollPosition);
-			dest.writeInt(isLayoutRtl ? 1 : 0);
-		}
-
-		@NonNull
-		@Override
-		public String toString() {
-			return "HorizontalScrollView.SavedState{"
-				+ Integer.toHexString(System.identityHashCode(this))
-				+ " scrollPosition=" + scrollPosition
-				+ " isLayoutRtl=" + isLayoutRtl + "}";
-		}
-
-		public static final Creator<SavedState> CREATOR
-			= new Creator<SavedState>() {
-			public SavedState createFromParcel(Parcel in) {
-				return new SavedState(in);
-			}
-
-			public SavedState[] newArray(int size) {
-				return new SavedState[size];
-			}
-		};
-	}
 }

packages/ui-mobile-base/android/widgets/src/main/java/org/nativescript/widgets/ScrollSavedState.java

@@ -0,0 +1,63 @@
+package org.nativescript.widgets;
+
+import android.os.Build;
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.view.View.BaseSavedState;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
+
+/**
+ * @author CatchABus
+ */
+class ScrollSavedState extends BaseSavedState {
+  public int scrollOffsetFromStart;
+
+  ScrollSavedState(Parcelable superState) {
+    super(superState);
+  }
+
+  public ScrollSavedState(Parcel source) {
+    super(source);
+    scrollOffsetFromStart = source.readInt();
+  }
+
+  @RequiresApi(Build.VERSION_CODES.N)
+  public ScrollSavedState(Parcel source, ClassLoader loader) {
+    super(source, loader);
+    scrollOffsetFromStart = source.readInt();
+  }
+
+  @Override
+  public void writeToParcel(Parcel dest, int flags) {
+    super.writeToParcel(dest, flags);
+    dest.writeInt(scrollOffsetFromStart);
+  }
+
+  @NonNull
+  @Override
+  public String toString() {
+    return "ScrollSavedState{"
+      + Integer.toHexString(System.identityHashCode(this))
+      + " scrollPosition=" + scrollOffsetFromStart
+      + "}";
+  }
+
+  public static final Creator<ScrollSavedState> CREATOR = new ClassLoaderCreator<ScrollSavedState>() {
+    public ScrollSavedState createFromParcel(Parcel in, ClassLoader loader)
+    {
+        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.N ? new ScrollSavedState(in, loader) : new ScrollSavedState(in);
+    }
+
+    @Override
+    public ScrollSavedState createFromParcel(Parcel in)
+    {
+        return createFromParcel(in, null);
+    }
+
+    public ScrollSavedState[] newArray(int size) {
+      return new ScrollSavedState[size];
+    }
+  };
+}

packages/ui-mobile-base/android/widgets/src/main/java/org/nativescript/widgets/Utils.java

@@ -21,6 +21,7 @@
 import android.util.Pair;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.ViewParent;
 
 import androidx.appcompat.content.res.AppCompatResources;
 import androidx.core.view.ViewCompat;
@@ -512,6 +513,18 @@ public void run() {
 		});
 	}
 
+	/**
+	 * Return true if child is a descendant of parent, (or equal to the parent).
+	 */
+	static boolean isViewDescendantOf(View child, View parent) {
+		if (child == parent) {
+			return true;
+		}
+
+		final ViewParent childParent = child.getParent();
+		return (childParent instanceof ViewGroup) && isViewDescendantOf((View) childParent, parent);
+	}
+
 //	public static void clearBoxShadow(View view) {
 //		if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.M) {
 //			return;

packages/ui-mobile-base/android/widgets/src/main/java/org/nativescript/widgets/VerticalScrollView.java

@@ -10,8 +10,6 @@
 import android.widget.FrameLayout;
 import androidx.core.widget.NestedScrollView;
 
-import org.nativescript.widgets.HorizontalScrollView.SavedState;
-
 /**
  * @author hhristov
  */
@@ -22,7 +20,7 @@ public class VerticalScrollView extends NestedScrollView {
 	private int contentMeasuredWidth = 0;
 	private int contentMeasuredHeight = 0;
 	private int scrollableLength = 0;
-	private SavedState mSavedState;
+	private ScrollSavedState mSavedState;
 	private boolean isFirstLayout = true;
 	private boolean scrollEnabled = true;
 
@@ -186,7 +184,7 @@ protected void onLayout(boolean changed, int left, int top, int right, int botto
 
 		this.mIsLayoutDirty = false;
 		// Give a child focus if it needs it
-		if (this.mChildToScrollTo != null && HorizontalScrollView.isViewDescendantOf(this.mChildToScrollTo, this)) {
+		if (this.mChildToScrollTo != null && Utils.isViewDescendantOf(this.mChildToScrollTo, this)) {
 			this.scrollToChild(this.mChildToScrollTo);
 		}
 
@@ -200,7 +198,7 @@ protected void onLayout(boolean changed, int left, int top, int right, int botto
 			final int scrollRange = Math.max(0,
 					childHeight - (bottom - top - this.getPaddingTop() - this.getPaddingBottom()));
 			if (this.mSavedState != null) {
-				scrollY = mSavedState.scrollPosition;
+				scrollY = mSavedState.scrollOffsetFromStart;
 				mSavedState = null;
 			}
 
@@ -232,7 +230,7 @@ public void onDetachedFromWindow() {
 
 	@Override
 	protected void onRestoreInstanceState(Parcelable state) {
-		SavedState ss = (SavedState) state;
+		ScrollSavedState ss = (ScrollSavedState) state;
 		super.onRestoreInstanceState(ss.getSuperState());
 		this.mSavedState = ss;
 		this.requestLayout();
@@ -241,8 +239,8 @@ protected void onRestoreInstanceState(Parcelable state) {
 	@Override
 	protected Parcelable onSaveInstanceState() {
 		Parcelable superState = super.onSaveInstanceState();
-		SavedState ss = new SavedState(superState);
-		ss.scrollPosition = this.getScrollY();
+		ScrollSavedState ss = new ScrollSavedState(superState);
+		ss.scrollOffsetFromStart = this.getScrollY();
 		return ss;
 	}