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So it was my mistake not knowing enough about Android and the sub systems to know that even though Android is primarily developed in Java it does not support running Java "natively". This means that JNI is not relevant as according to Wikipedia JNI is:

In software design, the Java Native Interface is a foreign function interface programming framework that enables Java code running in a Java virtual machine to call and be called by native applications and libraries written in other languages such as C, C++ and assembly

So in saying that - because Android does not run a JVM but rather it runs Native C on a Linux Kernel this means that trying to integrate a "java wrapper" through the JNI is not currently possible on Android.

Because of this - the common solution and following Gstreamers official tutorials appears to currently be the only way to use Gstreamer in Android.

I only have myself to blame for thinking that everyone else had just "missed" JNI and gst1-java-core and that I somehow knew better than even the Gstreamer official website itself.

I felt like answering this question though because if anyone else goes down the wrong track I can now officially suggest to following the official tutorials and create an Android App with Native support so that you can compile and integrate the C code directly from Gstreamer and then make your app work like that.

I can currently say that following the above paragraph's advice resulted in me creating a working Android application with a Gstreamer live stream currently up and running using a custom pipeline. I'm not going to say it was easy; because it isn't; especially if you are not great at C programming. But it is definitely doable and the tutorials are good.

If you use combobox.setItems(items); then ComboBox will automatically create a ListDataProvider out of those items, which means that you could the following

The CustomField is linked to a webcomponent with the Tag vaadin-custom-field so if you add a tag it will use a different webcomponent, in your case chart-field.

Why do you want to change the tag?

Collection::stream does not return an Optional, so you should not use flatMap here. You should keep using map on the optional.

.map(Collection::stream) gives you an Optional>. You seem to be trying to call the stream's map and collect methods on this. But you need to first call Optional.map before you can do that.

You should also use Optional.ofNullable if registration could be null:

Move the declaration for the adapter outside your onCreate function. You should then be able to access it from myfkt()

There is a way to achieve this effect.

First you need to create theme for vaadin-text-field. Create text-field-theme.css file in frontend/styles folder with content:

That's possible. Use the constructor new Tab(Components...) or add your icon using Tab#add(Component...). The components will be shown in header of tab. For example, you could pass a HorizontalLayout that contains an icon and a text component.

Have a look at this Vaadin tab component demo, paragraph "Tabs with custom content".

You will need to change the CSS within the shadow DOM of TimePicker's TextField value part, we use theme attribute as additional selector in order to not to theme all the text fields:

This has nothing to do with the allMatch, and everything to do with the fact that all arguments to a method get evaluated before that method is called, under all circumstances. All arguments to Stream.of, in this particular case, get evaluated before Stream.of is called.

If you really wanted something different, the closest thing to the behavior you want would look like