The rest of the functions inside that class will be obfuscated. In the example above, the function myFunction() will not be obfuscated. ANDROID STUDIO PLUGIN REMOVE UNUSEFUL RESOUCES CODETo fix the issue of R8 getting rid of needed code, we add the -keep line of code to the proguard rules. You can always generate a report on removed code to see what code was removed by R8. An app may not crash in its debug version but it might crash in its release version. NOTE: Always test your app to see if it works as expected. This may be because R8 did not check your code correctly. But, R8 may delete a piece of code that your app actually requires. It is not always advisable to rename all class names due to various reasons. R8 uses the proguard rules to optimize your code. This classes may not be required at runtime and so may slow the app build time.Ĭlass inlining rewrites the code in a way that unused builders or lambdas can be removed. This is a technique that attempts to remove classes that are only used internally. R8 provides another method to handle this Class inlining. In some situations, some code structures cannot be removed by the techniques above. R8 Canonicalizes debug information and compresses the debug number information. This shortens the names of classes and packages. This technique mainly focuses on the following: It performs static analysis of the code removing instantiated types and unreachable code. This technique ensures that it removes all unused codes and structures. R8 has several shrinking techniques which includes the following: This will prevent malicious users from reverse engineering your app.Īll the tasks above are done at compile-time by the R8 compiler. This means that it will take all class names, variables, and functions in your app and they will be renamed to short unreadable names before building the release version of the app. To provide security, R8 provides code obfuscation. It also disposes dead code that may be present. R8 will check, rewrite, and rearrange your code to improve code efficiency. When you shrink your app, you optimize your code. Such an application will be very large before being shrunk. Keep in mind that you also may have used some other libraries such as the Androidx libraries, Jetpack library, and Google Play Services. This obviously makes your app very large. This will include the unused methods and functions within that library.įor example, when you create an application in Kotlin, your app will carry the whole Kotlin-stdlib. When you don’t shrink your app, all 3rd party libraries that you included in your app will take some space in it. Also, it removes all resources that you added to your project but were never used. Enabling it to your project will remove all unused classes, functions, and variables. ANDROID STUDIO PLUGIN REMOVE UNUSEFUL RESOUCES ANDROIDfullMode = true How is R8 used to shrink, optimize and secure Android applications?Īs we mentioned, R8 is used to shrink applications before being released to the play store for users to access. To enable R8, open adle module app file and add this piece of code inside the buildTypes.Īndroid. Enabling R8 in your projectīy default, R8 is present in Android Studio. NOTE: For gradle version 3.4.0 or higher, R8 uses the proguard rules which are already predefined. It can shrink an app by 10%, whereas proguard can cut it by 8%.
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