The JDK 8 or more

Add under buildTypes in the main project build.gradle

 compileOptions {
            sourceCompatibility JavaVersion.VERSION_1_8
            targetCompatibility JavaVersion.VERSION_1_8
        }
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Remember to add it to the Module after the main project is added, otherwise there will be an error, I wonder if you have encountered it

Code confusion

-dontwarn java.lang.invoke.*
-dontwarn **$$Lambda$*
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This is where Lambda expressions can be used