Android Studio: This file not part of the project, but the project builds successfully

Question

I have a strange problem that suddenly appeared in android studio. I created a new cpp file, and included it in Android.mk. Then I synced the project. However, android studi

Answer 1

I have similar problem, it could be the compatibility issue of gradle version and gradle plugin version, because my solution is replacing the old configuration

// build.gradle
classpath 'com.android.tools.build:gradle:3.2.1'
...
// gradle-wrapper.properties
distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip

with the following new one by changing gradle version from 4.6 to 4.10.1.

// build.gradle
classpath 'com.android.tools.build:gradle:3.2.1'
...
// gradle-wrapper.properties
distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-all.zip

After that, Android studio can index and track my new cpp files in project.