Cannot run instrumented tests of a library on older devices

Question

On older devices (I tested v10 and 15), I cannot install any debug app build without using ProGuard because of this problem: Can't upload Android app to device (stale dexed jars)

Using ProGuard temporarily for the debug build with options -dontobfuscate and implicit shrinking reduces the number of methods and so allows running the app on those devices. Currently, I have found no other solution.

The same problem comes up when trying to run instrumented tests of my library on old devices. To allow code shrinking separately for this library, I changed its build.gradle:

apply plugin: 'com.android.library'
...
android {
    ..
    buildTypes {
        debug {
            minifyEnabled true
            shrinkResources false
            testProguardFile 'proguard-rules.pro'
            // or testProguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        ...
    }
}

(Hint: The library debug build is usually irrelevant for all builds besides instrumented tests because Android always uses release builds if the library is built as a dependency.)

Executing an instrumented Test of my library on an emulator (v15), I get the following kinds of errors:

Error:(19, 33) error: package my.proj....Config does not exist
Error:(18, 31) error: cannot find symbol variable ClassName

It does not find any symbols of the default source set of the library itself. This only happens with minifyEnabled true. How can this happen?

Cannot run instrumented tests of a library on older devices

0 Answers0