![]() ![]() ![]() Likewise, when the drag shadow leaves the bounding box, an ACTION_DRAG_EXITED action type is sent to the listener. Here you can retrieve the current x, y coordinates of the draggable view. In this state, the system dispatches one or more drag events to registered drag event listeners.įor example, as the drag shadow enters the bounding box of the view that is registered for drag events, the system dispatches the action type ACTION_DRAG_ENTERED to the listener.Īfter receiving an ACTION_DRAG_ENTERED event and before it can receive an ACTION_DRAG_EXITED event, the listener receives a new ACTION_DRAG_LOCATION event as the drag continues. Note: The following DragEvent methods are not valid on the ACTION_DRAG_STARTED event action type:Īs the user continues to drag, the drag process enters the continuing state. The app provides drag data along with a drag shadow callback as arguments to the system via startDragAndDrop(). When the user makes a UI gesture that your app recognizes as a trigger, such as a long click, the drag process begins. Now, you’ll take a look at each of these states, as the diagram below illustrates. The drag-and-drop process consists of four states: In this tutorial, you’ll use framework internals like drag event classes and drag listeners to design your own drag-and-drop operations. Users can drag and drop data across views within the same app or even from one app to another, if they have multi-window mode enabled. The Drag-and-Drop ProcessĪndroid’s drag-and-drop framework lets users move data and views using graphical gestures. As you follow along with the tutorial, you’ll see the app take shape. The starter project is a clean slate, ready for you to start working on it. The app currently shows the mask and the unmasked face, but you can’t do anything with them yet. Open the starter project in Android Studio. Getting Startedĭownload the starter project by clicking the Download Materials button at the top or bottom of the tutorial. You’ll start by looking at the starter project and learning how drag and drop works. ![]() If you need to brush up on your skills, check out our Android and Kotlin for Beginners learning path or our books, Android Apprentice and Kotlin Apprentice. Note: This tutorial assumes you have a basic working knowledge of the Kotlin programming language and Android development. ![]()
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