Short answer: No.
I think you're talking about ViewPager from ViewPager 2. My answer will be assuming ViewPager 2. Pls update the question to clarify that.
<include
android:visibility="gone"
tools:visibility="visible"
layout="@layout/item_that_shows_inside_viewholder"/>
And I agree that's a very poor way to do it. If in constraint layout you can loosely match the same constraints to make this show on top. And yes, you will inflate this in production code so you may incurr in performance slow down depending on what you have there.
It's very unfortunate that tools:layout
doesn't exist or work properly (yes, I got inconsistent results while trying it).
isInEditMode
on code on the parent class something in the fashion of
class CustomView ....
init {
// inflate layout that contains ViewPager
if ( isInEditMode() ) {
//do something that replaces ViewPager with its inflated view holder
}
}
which has served me well when I can use that. However that's unsuitable for most places.
isInEditMode
like above. One way that does certainly work is making your custom class extend FrameLayout and having an internal view that is your actual ViewPager. But then you have to re-implement and delegate all its methods, which is a big pain. Maybe kotlin has a way to do that, but so far I don't know how. Or maybe using reflection or kotlin poet could be a way to do that. It's too risky for my taste.
isInEditMode
like above it would work. But databinding adapters don't run in preview.This is the current full list of tools attributes: https://developer.android.com/studio/write/tool-attributes.html#toolslistitem_toolslistheader_toolslistfooter
It may be useful reading this Android XML Is there a way to use the tool namespace with custom attributes?
where a library to read custom attributes with tools gets mentioned. There may be an alternative with this library, but I have never used it and not sure how it works: https://github.com/giljulio/sneakpeek
I'd love to be proved wrong, but in my opinion all of the options are dead ends or too much effort.
In Andriod studio some views are shown in run time but not in compile time. Think about Frame Layout as a container for fragment transaction. We may place any kind of views on that container in run time. So, it's not possible to show a view while coding. The viewpager is playing same kind of role here. So, we can't show a view there before running and actually placing a fragment/other view there.
I hope you are clear now. :)
This is possible, when putting the ViewPager
into it's own XML layout resource.
Alike this one can show the desired Fragment
instead of the ViewPager
:
<fragment
android:id="@+id/fragment_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout="@layout/fragment_viewpager"
tools:layout="@layout/fragment_preview" />
This also provides the XML preview for the navigation
graph design view.
tools:
layout only works with fragment
, but not with include
.
我认为这不是......一些布局在编码或设计时没有预览......就像TabLayout
是否可以像在ListView
/ RecyclerView
/ ViewPager
中那样在AndroidStudio中显示ViewPager
的预览布局?
Although I don't think there is such a functionality out of the box, I used the following workaround to achieve design time preview for the ViewPager:
<include>
with the view that you will use in your ViewPager as a layout,just after the ViewPager itself<include>
view so that it will be visible at design time but not at runtime. Also set tools:visibility="gone" to the ViewPager so that it will be invisible at design time.The idea is to hide ViewPager at design time and show its contents instead while doing the opposite at runtime. This should work for other controls as well.
To show an example:
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="@id/tabl1"
tools:visibility="gone">
</androidx.viewpager.widget.ViewPager>
<include
layout="@layout/fragment_example1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone"
tools:visibility="visible"
app:layout_constraintTop_toBottomOf="@id/tabl1" />
I hope this helps you
For either ListView
and RecyclerView
you can enable preview by adding:
tools:listitem="@layout/view_onboarding_slide"
I cannot find equivalent solution for ViewPager
.
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