Package Name & Application ID

applicationId

Get Define

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BuildConfig.APPLICATION_ID

Some feature

Can switch suffix by add

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android{
    buildTypes{
        release {
            applicationIdSuffix ".release"
        }
        debug {
            applicationIdSuffix ".debug"
        }
    }  
}

in app’s build.gradle

packageName

Get define

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getApplicationContext().getPackageName()

The value will be overrided with applicationId

Java package

The structure of a project, it’s ok that differ from applicationId.