buttonSelectFolder.setOnClickListener {
    storageHelper.openFolderPicker()
}

storageHelper.onFolderSelected = { requestCode, folder ->
    // tell user the selected path
}

val grantedPaths = DocumentFileCompat.getAccessibleAbsolutePaths(this)
val path = grantedPaths.values.firstOrNull()?.firstOrNull() ?: return
val folder = DocumentFileCompat.fromFullPath(this, path, requiresWriteAccess = true)
val file = folder?.makeFile(this, "notes", "text/plain")

val fileFromExternalStorage = DocumentFileCompat.fromSimplePath(context, basePath = "Download/MyMovie.mp4")

val fileFromSdCard = DocumentFileCompat.fromSimplePath(context, storageId = "9016-4EF8", basePath = "Download/MyMovie.mp4")

val myVideo = MediaStoreCompat.fromFileName(context, MediaType.DOWNLOADS, "MyMovie.mp4")

val imageList = MediaStoreCompat.fromMediaType(context, MediaType.IMAGE)

class MainActivity : AppCompatActivity() {

    private val storageHelper = SimpleStorageHelper(this)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Only setup required callbacks, based on your need:
        storageHelper.onStorageAccessGranted = { requestCode, root ->
            // do stuff
        }
        storageHelper.onFolderSelected = { requestCode, folder ->
            // do stuff
        }
        storageHelper.onFileSelected = { requestCode, files ->
            // do stuff
        }
        storageHelper.onFileCreated = { requestCode, file ->
            // do stuff
        }

        // Depends on your actions:
        btnRequestStorageAccess.setOnClickListener { storageHelper.requestStorageAccess() }
        btnOpenFolderPicker.setOnClickListener { storageHelper.openFolderPicker() }
        btnOpenFilePicker.setOnClickListener { storageHelper.openFilePicker() }
        btnCreateFile.setOnClickListener { storageHelper.createFile("text/plain", "Test create file") }
    }

    override fun onSaveInstanceState(outState: Bundle) {
        storageHelper.onSaveInstanceState(outState)
        super.onSaveInstanceState(outState)
    }

    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
        super.onRestoreInstanceState(savedInstanceState)
        storageHelper.onRestoreInstanceState(savedInstanceState)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        // Mandatory for direct subclasses of android.app.Activity,
        // but not for subclasses of androidx.fragment.app.Fragment, androidx.activity.ComponentActivity, androidx.appcompat.app.AppCompatActivity
        storageHelper.storage.onActivityResult(requestCode, resultCode, data)
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        // Mandatory for direct subclasses of android.app.Activity,
        // but not for subclasses of androidx.fragment.app.Fragment, androidx.activity.ComponentActivity, androidx.appcompat.app.AppCompatActivity
        storageHelper.onRequestPermissionsResult(requestCode, permissions, grantResults)
    }
}

val folder: DocumentFile = ...
val targetFolder: DocumentFile = ...

// Since moveFolderTo() is annotated with @WorkerThread, you must execute it in the background thread
folder.moveFolderTo(applicationContext, targetFolder, skipEmptyFiles = false, callback = object : FolderCallback() {
    override fun onPrepare() {
        // Show notification or progress bar dialog with indeterminate state
    }

    override fun onCountingFiles() {
        // Inform user that the app is counting & calculating files
    }

    override fun onStart(folder: DocumentFile, totalFilesToCopy: Int, workerThread: Thread): Long {
        return 1000 // update progress every 1 second
    }

    override fun onParentConflict(destinationFolder: DocumentFile, action: FolderCallback.ParentFolderConflictAction, canMerge: Boolean) {
        handleParentFolderConflict(destinationFolder, action, canMerge)
    }

    override fun onContentConflict(
        destinationFolder: DocumentFile,
        conflictedFiles: MutableList<FolderCallback.FileConflict>,
        action: FolderCallback.FolderContentConflictAction
    ) {
        handleFolderContentConflict(action, conflictedFiles)
    }

    override fun onReport(report: Report) {
        Timber.d("onReport() -> ${report.progress.toInt()}% | Copied ${report.fileCount} files")
    }

    override fun onCompleted(result: Result) {
        Toast.makeText(baseContext, "Copied ${result.totalCopiedFiles} of ${result.totalFilesToCopy} files", Toast.LENGTH_SHORT).show()
    }

    override fun onFailed(errorCode: ErrorCode) {
        Toast.makeText(baseContext, "An error has occurred: $errorCode", Toast.LENGTH_SHORT).show()
    }
})