Why does my function that calls an API or launches a coroutine return an empty or null value?

javaandroidkotlinfirebasegoogle-cloud-firestore
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R cannot be resolved - Android error

androidcompiler-errorseclipseandroid-resourcesandroid-sdk-tools
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Is quitting an application frowned upon?

android
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Android 8: Cleartext HTTP traffic not permitted

androidhttphttps
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How to return a DocumentSnapShot as a result of a method?

javaandroidfirebasegoogle-cloud-firestore
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