I am having a Fragment, where I inflate "fragment_board.xml":
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<view
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.app.BoardView"
android:id="@+id/view_board"/>
</FrameLayout>
As you can see, fragment_board contains a custom view "BoardView", from where I want to load the following "view_board.xml":
<com.app.BoardView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none"
android:fadingEdge="none"
android:requiresFadingEdge="none"
android:overScrollMode="always"
android:id="@+id/board_scrollview_vertical">
<android.widget.HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scrollbars="none"
android:fadingEdge="none"
android:requiresFadingEdge="none"
android:overScrollMode="always"
android:id="@+id/board_scrollview_horizontal"
android:foregroundGravity="left">
</android.widget.HorizontalScrollView>
</com.app.BoardView>
My custom view contains two scroll views (I use it for panning), and I want to be able to re-use it in other layouts. The BoardView extends the outer (vertical) scroll view like this:
public class BoardView extends ScrollView
When I use it stand-alone, it inflates fine and I can findViewById() both scroll views in the inflated layout. But when I use it in a layout tree (such as a fragment), I run into problems.
In the fragment, I inflate the layout tree like this:
View view = inflater.inflate(R.layout.fragment_board, container, false)
From the fragment, I can findViewById() the outer (vertical) scroll view, but findViewById() returns null for the inner (horizontal) scroll view.
In BoardView, I inflate like this:
View view = inflate(getContext(), R.layout.view_board, this);
As said, I can find both scroll views fine when inflated by itself, but when inflated as part of the fragment, I get StackOverflowError.
It is clear why: I inflate in the fragment first, and then I inflate the same XML in the view again, which triggers another inflation of the view and so on. I get a cyclic reference here. Problem I can't figure out how I can add the inner (horizontal) scroll view to the already existing layout. I think I need to merge somehow or inflate layouts manually, but I can't figure out how.
Here are some refs (which didn't help in my case):
- Android - Writing a custom (compound) component
- How to inflate XML-Layout-File correctly inside Custom ViewGroup?
- Create a custom View by inflating a layout?
- InvocationTargetException on inflating an xml - android
- Android: StackOverFlowError with InvocationTargetException when inflating layout
Can anybody suggest what I should do. If possible, I'd want BoardView to work as a generic component, which I can plug into a layout tree where needed.
As Android [according to one of the refs above] does not officially support composite components, would my best option be to drop XML layouts for the inner views and add them in code?
