Per @RHo's blessing, the Android app may stop hiding IPAs and replacing them with a button, and can instead show the full IPA as the iOS app and the mobile web site do.
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I've submitted patches in the various places required to accomplish this, but there are a few issues with the resulting presentation:
1. The IPA text links to Help:IPA/{$lang} (maybe this is OK?)
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2. Clicking the speaker icon loads a speaker thumbnail in the gallery activity rather than playing the audio file. (Also, it's redundant because we have a native pronunciation button next to the article title.)
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3. Clicking the "listen" text next to the icon opens the chooser for the user to choose an app to play the audio file.
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How does the iOS app handle these issues? Are they blockers?
Patches:
https://gerrit.wikimedia.org/r/#/c/419423/ (MobileApp extension)
https://gerrit.wikimedia.org/r/#/c/419443/ (MCS)
https://gerrit.wikimedia.org/r/#/c/419430/ (Android app)