`Environment.isExternalStorageWritable` not usable

[jasonsparc]

The extension functions for android.os.Environment that is currently provided by KEnvironment.kt cannot be used without first creating an instance of Environment which isn't desirable because android.os.Environment is just meant as a utility class filled with static methods.

To access the provided extension functions I have to write this:

if (Environment().isExternalStorageWritable()) {
  …
}

That is, notice Environment() and not Environment which means I have to create an instance of Environment first before using it.

It is currently not possible in Kotlin to provide static extension functions to existing java classes. See, https://discuss.kotlinlang.org/t/static-extension-methods-for-java-classes/2190

Therefore the extension functions provided by KEnvironment.kt is not usable or practical. I would say either removing it or changing them into top-level functions instead.