Android Studio not deploying changes to app

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EDIT2 (2020-03-09)

If you are using gradle 6.0 in your gradle-wrapper.properties, you may also encounter a similar situation because there is this bug in 6.0 version. Try 6.0.1 instead.

Yesterday (2018-03-27) Android Studio published an official update from 3.0.1 to 3.1, and it looks like a lot of people (including me) start running into this issue again.

Credit to #5 comment here, below is how it solved:

In Android Studio, go to Run > Edit Configuration.

Under Before launch:, if you cannot find Gradle-aware Make, just like below:

enter image description here

Add Gradle-aware Make and leaving Task empty.

enter image description here

Warning: I don’t know what these action means, and whether it will cause any side-effects. Appreciate if someone can give more explanation on it!

EDIT

Thanks to @ChristopherSmit referenced, this page mentions that Gradle-aware make means “Compile the project and run Gradle”.
At first I guess this may make Runs take longer time even if no code has been changed; but after testing, the second time is still much faster if no code has been changed.
Given that fact that this is a default option if you create a new project using AS 3.1, I think this configuration is pretty safe.

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