import class of libs in the Android Studio project is locked

Question

I copied the commons-io-2.6.jr into libs folder, and I've decompressed it. But the icon shows classes were locked. The FileUtils class can not be used.

Answer 1

You don't need to decompress the jar file to use it. Instead of using the jar, you can import the commons-io library through Gradle. Add this line in your app's build.gradle file:

dependencies {
    implementation 'commons-io:commons-io:2.6'
    // other libs...
}

If you really want to use the jar file, you can import your libs folder through Gradle as explained here.