Sample of DragStartHelper

MainActivity.kt

/* Copyright 2021 Google LLC.	
   SPDX-License-Identifier: Apache-2.0 */
// Make a view draggable to share a file. DragStartHelper takes care of
// intercepting drag gestures and attaching the listener.
DragStartHelper(draggableView) { view, _ ->
    // Sets the appropriate MIME types automatically.
    val dragClipData = ClipData.newUri(contentResolver, "File", fileUri)

    // Set the visual look of the dragged object.
    // Can be extended and customized; we use the default here.
    val dragShadow = View.DragShadowBuilder(view)

    // Starts the drag. Note that the global flag allows for cross-app dragging.
    view.startDragAndDrop(
        dragClipData,
        dragShadow,
        null, // Optional extra local state information
        // Since this is a "content:" URI and not just plain text, we can use the
        // DRAG_FLAG_GLOBAL_URI_READ to allow other apps to read from our content
        // provider. Without it, other apps won't receive the drag events.
        DRAG_FLAG_GLOBAL or DRAG_FLAG_GLOBAL_URI_READ)
    )
}.attach()