Example usage for android.view View DRAG_FLAG_GLOBAL_URI_READ

Introduction

In this page you can find the example usage for android.view View DRAG_FLAG_GLOBAL_URI_READ.

Prototype

int DRAG_FLAG_GLOBAL_URI_READ

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Document

When this flag is used with #DRAG_FLAG_GLOBAL , the drag recipient will be able to request read access to the content URI(s) contained in the ClipData object.

Usage

From source file:com.example.android.dragsource.DragSourceFragment.java

private void setUpDraggableImage(ImageView imageView, final Uri imageUri) {

    // Set up a listener that starts the drag and drop event with flags and extra data.
    DragStartHelper.OnDragStartListener listener = new DragStartHelper.OnDragStartListener() {
        @Override//from  w  w w.ja va  2 s .  c  om
        public boolean onDragStart(View view, final DragStartHelper helper) {
            Log.d(TAG, "Drag start event received from helper.");

            // Use a DragShadowBuilder
            View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view) {
                @Override
                public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) {
                    super.onProvideShadowMetrics(shadowSize, shadowTouchPoint);
                    // Notify the DragStartHelper of point where the view was touched.
                    helper.getTouchPosition(shadowTouchPoint);
                    Log.d(TAG, "View was touched at: " + shadowTouchPoint);
                }
            };

            // Set up the flags for the drag event.
            // Enable drag and drop across apps (global)
            // and require read permissions for this URI.
            int flags = View.DRAG_FLAG_GLOBAL | View.DRAG_FLAG_GLOBAL_URI_READ;

            // Add an optional clip description that that contains an extra String that is
            // read out by the target app.
            final ClipDescription clipDescription = new ClipDescription("",
                    new String[] { getContext().getContentResolver().getType(imageUri) });
            // Extras are stored within a PersistableBundle.
            PersistableBundle extras = new PersistableBundle(1);
            // Add a String that the target app will display.
            extras.putString(EXTRA_IMAGE_INFO, "Drag Started at " + new Date());
            clipDescription.setExtras(extras);

            // The ClipData object describes the object that is being dragged and dropped.
            final ClipData clipData = new ClipData(clipDescription, new ClipData.Item(imageUri));

            Log.d(TAG, "Created ClipDescription. Starting drag and drop.");
            // Start the drag and drop event.
            return view.startDragAndDrop(clipData, shadowBuilder, null, flags);

        }

    };

    // Use the DragStartHelper to detect drag and drop events and use the OnDragStartListener
    // defined above to start the event when it has been detected.
    DragStartHelper helper = new DragStartHelper(imageView, listener);
    helper.attach();
    Log.d(TAG, "DragStartHelper attached to view.");
}

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