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Android espresso No views in hierarchy found matching

I was trying to find a view and tried different combinations but my logic looks right according to all stackoverflow examples.
My code:
onData(anything()).inAdapterView(
instanceOf(ListView::class.java))
.atPosition(0)
.onChildView(withId(android.R.id.title))
.check(matches(withText("Edit")))
.check(matches(isDisplayed()))
And it throws error:
E/TestRunner: androidx.test.espresso.NoMatchingViewException: No views in hierarchy found matching: (with id: android:id/title and is descendant of a: displaying data matching: ANYTHING within adapter view matching: an instance of android.widget.ListView)
If the target view is not part of the view hierarchy, you may need to use Espresso.onData to load it from one of the following AdapterViews:androidx.appcompat.widget.MenuPopupWindow$MenuDropDownListView{3df3337 VFED.VC.. ........ 0,0-539,264}
Any ideas what I'm doing wrong?

You could give a try with this for your case. Unfortunately, I cannot be sure about how onData() could work here but after researching you should try something like this:
onView(withId(R.id.title))
.check(matches(withText("Edit")))
.check(matches(isDisplayed()));

Get TreeViewer in RCP from another Plugin

I'm working at a Plugin for a Eclipse-RCP. There is another Plugin with a TreeViewer and I want to select an Item from my Plugin. I don't know how to get access it, is this even possible?
I think can get the correct view with:
IViewReference home;
IViewReference [] viewRefs = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getViewReferences();
for (int i = 0; i < viewRefs.length; i++) {
if(viewRefs[i].getId()==myid){
home = viewRefs[i];
break;
}
}
But home is not a TreeViewer and I cant cast it. How can I get the TreeViewer?
home.getTreeViewer() //Doesn't work cause of casting issues
I am a newbie to rcp, so I would be nice for some explanation.

You need to find your view using:
IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
IViewPart viewPart = page.findView("your view id");
You can then cast the view part to your view class and call a method that you write on that class:
if (viewPart != null) {
MyViewClass myViewPart = (MyViewClass)viewPart;
myViewPart.getTreeViewer();
}
where MyViewClass is your ViewPart class. You will have to write the getTreeViewer method.
If the view is not currently open you can use showView:
viewPart = page.showView("your view id");

You have to cast home to the type of your other view. Then you can get the TreeViewer.

You can find the ViewPart directly from your active IWorkbenchPage using IWorkbenchPage#findView(java.lang.String).
If you have the object you want to be selected, get the View's Site, get the Site's selection provider, and then tell the selection provider what should be selected (with a StructuredSelection instance containing the object). This only works if the tree, or whatever is in the part (you shouldn't have to care or know that it's a tree), actually contains the object that you're telling it to select.

Set Canvas to Eclipse View?

I've created an (empty until now) View in my Eclipse Plugin. I'm also using Eclipse Cloudio. This library provides the following object (description taken from the linked site):
A TagCloud is a special org.eclipse.swt.widgets.Canvas, dedicated to display a tag cloud.
Basically it's an image showing a WordCloud. Now there are snippets on the site on how to show such TagClouds in a shell / popup.
But I'd like to show them in a view (this function is supposed to be used often and I think it's bad style to spam popup-windows).
What I do not know tho is how to set this TagCloud (which is a Canvas) to the View / make the View display the Canvas. Maybe someone can help me with this?
Edit:
gregs Answer works like a charm! It just needs another setWords() function which is called from where-ever which contains .setWords to set the words when neccessary.

You just need to add the control to the view in the view createPartControl. At the simplest that would be:
#Override
public void createPartControl(final Composite parent)
{
TagCloud cloud = new TagCloud(parent, SWT.NONE);
... set up the cloud as in the example
}

Override eclipse Plugin in Project explorer

In my project the user sees the red cross icon on the file containing an error and the folders above. When the (modelling nature of the sirius) plugin is added to the project the red cross dissapears on the file (not on the folders).
How can i keep the error icon on the file?
I can get information about the content extension which probably causes the problem
IWorkbenchPage page = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage(); ProjectExplorer expl = (ProjectExplorer) page.findView(IPageLayout.ID_PROJECT_EXPLORER);
INavigatorContentService content = expl.getNavigatorContentService();
INavigatorContentExtension siriusext = content.getContentExtensionById("org.eclipse.sirius.ui.resource.content.session");
siriusext.getDescriptor().getAppearsBeforeId();
The problem is probably the sirius INavigatorContentService because it is set to appear before id "org.eclipse.jdt.java.ui.javaContent"
(siriusext.getDescriptor().getAppearsBeforeId())
How can i (have the modelling nature and) keep the error icon on the file?
Any help is appreciated!

I answered your question on the Sirius forum [1].
The problem seems to come from the getImage() implementation in the label provider used by the INavigatorExtension provided by Sirius.
A workaround could be to try to provide your own navigator content with an Override element targeting the Sirius Content Management (org.eclipse.sirius.ui.resource.content.session) as suppressed extension and provide your own label provider (which could extend the Sirius one and specifically handle the file case in getImage, but you might loose the M decorator on files handled by Sirius).
Could you open a bugzilla [2] to track the issue ? Then the team will have the possibility to analyze the issue and try to find a proper solution.
Regards,
Maxime
[1] https://www.eclipse.org/forums/index.php?t=msg&th=877968&goto=1498330&#msg_1498330
[2] https://bugs.eclipse.org/bugs/enter_bug.cgi?product=sirius

How to force update of view titles after having changed the locale and restarted?

In a RCP application, I change the locale by programatically setting it in the .ini file and restarting the application.
The problem is that view titles, which are defined in OSGI-INF/l10n files referred from the plugin.xml file, aren't updated until I focus them.
For example after having switched from EN to FR, I have this :
It's only after I click on the second tab that I get this :
I can't reset the perspectives as they may have been changed by the user (view resized, removed or added). I've set configurer.setSaveAndRestore(true); in my WorkbenchAdvisor.initialize method to ensure the views layout is restored at launch.
Is there a way to programatically force an update of the views titles without losing the perspective configuration ?
I precise that I can't use the new Eclipse 4 (Juno) API.

As you are restoring perspective from previous session, it might be remembering part titles.
By default ViewPart doesnt do anything in saveMemento() method.
Override below methods are to debug the issue
public void init(IViewSite site, IMemento memento) throws PartInitException
String getPartName()