If you want to read or edit a talk page you actually need to search for the title of the talk page (e.g. "Talk:Android" and click "Talk:Android_(operating_system)"). It would be better to have a link/button at the end of an article (or in the menu under "Font and theme") which takes you directly to the talk page.
|Declined||None||T124865 Support any default type of pages in the app|
|Resolved||RHo||T89606 Make it easier to access talk pages in the Android app|
|Open||None||T95396 Inform the user, when there is a new message on their talk page|
In conjunction with merging T92285 into this case: Please note that the problem does not only affect article talk pages, as this case's description suggests, but also user talk pages.
It is a problem that app users won't find article talk pages, but it's an absolute no-go that they'll never even notice that someone posted a message on their talk page. This will lead (and possibly already has done so) to users being blocked because they don't react to those messages accordingly, or users turn themselves away from Wikipedia as they don't understand why some of their edits are reverted without an explanation, or other users get angry because noboy listens to them any more. Being able to communicate is an absolutely essential part of editing Wikipedia, and not being able to do so is not just a missing feature, it's a definitive and avoidable root of conflicts.
While not ideal, I wanted to mention that some basic improvements have been made to access talk pages from corresponding articles. When viewing an article scroll all the way down (hint: use ToC to quickly just to last section). At the end there should be a "Talk" link, which opens the Talk page in a browser.