DragAndDrop

A simple yet effective way to add DragAndDrop to your Android app!

The DragAndDrop framework is an easy to use android library to add drag and drop functionality to your app. Unlike the official android Drag and Drop implementation (https://developer.android.com/guide/topics/ui/drag-drop) it is primarily designed for UI actions. I.e. with google's drag & drop it's very hard to change drawables easily on drag and drop actions. This library handles it with ease.

This library is used in the app: Picsel - Your free photostory app

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repositories {
    google()
    jcenter()
}

dependencies {
  implementation 'com.doaphotostory.opensource:draganddrop:0.0.4'
}

How do I use DragAndDrop?

// Init your view objects

ImageView draggableView = findViewById(R.id.your_draggable_view_id);
ImageView droppableView = findViewById(R.id.your_droppable_view_id);

...

// Make a View object draggable

DragAndDropManager.with(draggableView)        // Initialize DragAndDropManager with your view
	.makeDraggable()                      // Make it draggable
	.addOnHoverDrawable(droppableView,    // Optionally add a hover drawable for a specific droppable
             R.drawable.your_draggable_hover_drawable);

// Make a View object droppable

DragAndDropManager.with(droppableView)                                    // Initialize DragAndDropManager with your view
	.makeDroppable()                                                  // Other views might be dropped on this view
	.setOnHoverDrawable(R.drawable.your_droppable_hover_drawable);    // Optionally specify a drawable to change if another view is hovered
	.setOnHoverVibrate(15);                                           // Optionally set to vibrate vibrator in milliseconds if another view is hovered

// If you need more control

DragAndDropManager.with(droppableView)
	.makeDroppable()
	.setOnDragListener(new DragAndDroppable.OnDragListener() {
                    @Override
                    public boolean onDrag(DragAndDroppable dragAndDroppable, DragAndDropEvent dragEvent) {
                        switch (dragEvent.getAction()) {
                            case DragAndDropEvent.ACTION_DRAG_STARTED:
                                  // Signals the start of a drag and drop operation.
				  break;
                            case DragAndDropEvent.ACTION_DRAG_LOCATION:
                                  // Sent during the whole drag
				  break;
                            case DragAndDropEvent.ACTION_DRAG_ENTERED:
                                  // Signals to a View that the drag point has entered the bounding box of the View.
				  break;
                            case DragAndDropEvent.ACTION_DRAG_EXITED:
                                  //Signals that the user has moved the draggable view out of the bounding box of the droppable View
				  break;
                            case DragAndDropEvent.ACTION_DROP:
                                  // Signals to the droppable that the user has released the draggable view, and the drag point is within the bounding box of the View
				  break;
                            case DragAndDropEvent.ACTION_DRAG_ENDED:
                                  // Signals to the droppable that the drag and drop operation has concluded.
                        }
                        return true;
                    }
                });

// The DragAndDropEvent is quiet similar to (https://developer.android.com/reference/android/view/DragEvent).

Author

Georg Wollmann

License

Apache 2.0. See the LICENSE file for details.