What's the difference between "minifyEnabled" and "useProguard" in the Android Plugin for Gradle?

I see that the Android Plugin for Gradle has a minifyEnabled property as well as a useProguard property, as follows:

android {
    buildTypes {
        debug {
            minifyEnabled true
            useProguard false
        }
        release {
            minifyEnabled true
            useProguard true
        }
    }
}

What's the difference between these two properties? Or, rather, what's the meaning of each?

Quoting from tools.android.com:

> Built-in shrinker > > Version 2.0 of Android Plugin for Gradle ships with an experimental > built-in code shrinker, which can be used instead of ProGuard. The > built-in shrinker supports fast incremental runs and is meant to speed > up iteration cycles. It can be enabled using the following code > snippet: > > android { > buildTypes { > debug { > minifyEnabled true > useProguard false > proguardFiles getDefaultProguardFile('proguard-android.txt') > } > } > } > > The built-in shrinker can only remove dead code, it does not obfuscate or optimize. It can be configured using the same files as > ProGuard, but will ignore all flags related to obfuscation or > optimization. > > Unlike ProGuard, we support using the built-in shrinker together with > Instant Run: depending on the project, it may significantly decrease > the initial build and install time. Any methods that become reachable > after a code change will appear as newly added to the program and > prevent an Instant Run hotswap.

You don't need useProguard true anymore.

Code shrinking with R8 is enabled by default when you set the minifyEnabled property to true.

When you build your project using Android Gradle plugin 3.4.0 or higher, the plugin no longer uses ProGuard to perform compile-time code optimization. Instead, the plugin works with the R8 compiler to handle the tasks according to the official document.

If you want to use ProGuard instead of R8. Add this line in the gradle.properties file

 android.enableR8=false

I set minifyEnabled true for my release buildType and it removed an entire enum which it thougt to be unused code i guess. This made my app crash due to a NoSuchFieldException. Took me 4 hours to find the reason for this crash. 0/10 can not recommend minifyEnabled.

Just enable minifyEnabled will have code both optimized and obfuscated. This is because useProguard true is default so no need to set it explicitly.

See also: https://stackoverflow.com/questions/17290023/obfuscation-in-android-studio