![]() Now that you have a theoretical understanding of Android drag-and-drop operations, it’s time to apply this knowledge in a real app! Designing a Drag Operation Optionally, check the drop success status by invoking getResult().Reset all the state or UI changes you made during the drag operation.You retrieve data passed from this drag event as arguments in startDragAndDrop()/ startDrag().įinally, the system wraps up the drag operation by dispatching a drag event with the action type ACTION_DRAG_ENDED.Īfter receiving ACTION_DRAG_ENDED, each drag event listener should: When the user releases the drag shadow over a view that’s registered for drag events, the system dispatches a drag event with action type ACTION_DROP. In your app, you’ll only deal with the ACTION_DRAG_ENTERED and ACTION_DRAG_EXITED action types. 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. See HTTP2 Delivery of Content for complete details on getting started using HTTP/2 with your Dynamic Media account.Note: This tutorial assumes you have a basic working knowledge of the Kotlin programming language and Android development. Delivery of Dynamic Media assets can now be over HTTP/2 which provides better response and load times. It provides faster transfer of information and reduces the amount of processing power that is needed. HTTP/2 is the new, updated web protocol that improves the way browsers and servers communicate. Use HTTP/2 to deliver your Dynamic Media assets Paste the embed code into your web pages. In the Embed Code dialog box, copy the entire code to the clipboard, and then select Close. The viewer preset is applied to the asset. In the left rail, select a viewer preset name. In the left rail, select the drop-down list and select Viewers. In addition, the viewer preset or image preset must also be published. Remember that the embed code is only available to copy after you have first published the assets. Navigate to the published video or image asset whose embed code you want to copy. To embed the Dynamic Media Video or Image viewer on a web page: In addition, you must also publish the viewer preset or image preset. The embed code is not available to copy until you have published the selected asset.
0 Comments
Leave a Reply. |