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copied!<blockquote> <p>Service messaging or AIDL is out of the question because it always has an asynchronous part to it (as well as Intents).</p> </blockquote> <p>Binding to an AIDL-based service is asynchronous, but that is done once up front. Calling an AIDL-defined method is synchronous.</p> <blockquote> <p>I also thought of ContentProvider but it seems a little bit exaggerated/bloated just for this.</p> </blockquote> <p>Most of your choices will be similarly "exaggerated/bloated just for this". </p> <blockquote> <p>am I missing anything</p> </blockquote> <p>You could use broadcast <code>Intents</code> to push changes to the value, particularly if the value does not change frequently. The challenge here is bootstrapping the initial value (e.g., App B is installed and needs the value from App A, but has to wait until the value changes and App A sends the broadcast). However, this might be worth considering if you will be reading the value a lot, as doing an IPC per read may add more overhead than it is worth.</p> <p>Also, you may wish to reconsider whether having this dependency is a good idea in the first place. Using the nomenclature from my preceding paragraph, App B perhaps cannot exist without App A, if it needs some value maintained by App A. Since the user can uninstall App A at any point, this could cause problems. Also, if this flag is meant as some sort of control mechanism (e.g., please don't do X while the other app is doing Y), you will have problems, particularly on multi-core devices where both processes might truly be running simultaneously.</p>

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