Remove all unused classes,methods from Android Studio project

Question

I have used the lint(Analyze->Inspect Code...) and find out unused methods and resources. All the unused resources removed by Refractor->Remove unused R

Answer 1

Step 1

Generate usage.txt and mapping.txt with Proguard or R8

• Add -printusage to your proguard.pro file Run

• ./gradlew app:minifyReleaseWithProguard or ./gradlew app:minifyReleaseWithR8

Step 2

Find class name records that is in usage.txt but not in mapping.txt, those are the unused classes that are removed by Proguard/ R8 It's not hard to write such algorithm but you can consider my approach using Binary Search Tree here