Clear Android web view cache

clear_kotlin_web_view_cache.kt

    //helper method for clearCache() , recursive
    //returns number of deleted files
    fun clearCacheFolder(dir: File?, numDays: Int): Int {

        var deletedFiles = 0
        if (dir != null && dir!!.isDirectory()) {
            try {
                for (child in dir!!.listFiles()) {

                    //first delete subdirectories recursively
                    if (child.isDirectory()) {
                        deletedFiles += clearCacheFolder(child, numDays)
                    }

                    //then delete the files and subdirectories in this dir
                    //only empty directories can be deleted, so subdirs have been done first
                    if (child.lastModified() < Date().getTime() - numDays * DateUtils.DAY_IN_MILLIS) {
                        if (child.delete()) {
                            deletedFiles++
                        }
                    }
                }
            } catch (e: Exception) {
                Log.e("Clear WebView Cache", String.format("Failed to clean the cache, error %s", e.message))
            }

        }
        return deletedFiles
    }

    /*
    * Delete the files older than numDays days from the application cache
    * 0 means all files.
    */
    fun clearCache(context: Context, numDays: Int) {
        Log.i("Clear WebView Cache", String.format("Starting cache prune, deleting files older than %d days", numDays))
        val numDeletedFiles = clearCacheFolder(context.getCacheDir(), numDays)
        Log.i("Clear WebView Cache", String.format("Cache pruning completed, %d files deleted", numDeletedFiles))
    }