Exampleįollowing example shows the functionality of a simple Drag & Drop using tOnLongClickListener(), tOnTouchListener()and View.OnDragEventListener(). Next either you can extend extend View.DragShadowBuilder to create a drag shadow for dragging the view or simply you can use View.DragShadowBuilder(View) to create a default drag shadow that's the same size as the View argument passed to it, with the touch point centered in the drag shadow. For a drag and drop operation that does not represent data movement, you may want to use null instead of an actual object. As part of the ClipData object, supply metadata that is stored in a ClipDescription object within the ClipData. You start with creating a ClipData and ClipData.Item for the data being moved. The combination of the onDragEvent(DragEvent) method and View.OnDragListener is analogous to the combination of the onTouchEvent() and View.OnTouchListener used with touch events in old versions of Android. If this occurs, the system first calls the listener and then defined callback as long as listener returns true. You can have both a listener and a callback method for View object. When the system calls the method or listener, it passes to them a DragEvent object explained above. If you want any of your views within a Layout should respond Drag event then your view either implements View.OnDragListener or setup onDragEvent(DragEvent) callback method. Returns a string representation of this DragEvent object.
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Returns an indication of the result of the drag and drop operation. Returns the ClipDescription object contained in the ClipData.
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Returns the ClipData object sent to the system as part of the call to startDrag(). Signals to a View that the drag and drop operation has concluded.įollowing are few important and most frequently used methods available as a part of DragEvent class. Signals to a View that the user has released the drag shadow, and the drag point is within the bounding box of the View. Signals that the user has moved the drag shadow outside the bounding box of the View. Sent to a View after ACTION_DRAG_ENTERED if the drag shadow is still within the View object's bounding box. Signals to a View that the drag point has entered the bounding box of the View. Signals the start of a drag and drop operation. Constantsįollowing are all constants integers available as a part of DragEvent class. This class provides few Constants and important methods which we use during Drag/Drop process. The DragEvent represents an event that is sent out by the system at various times during a drag and drop operation. The system sends the View object's listener a drag event with action type ACTION_DROP.Įnded − Just after the action type ACTION_DROP, the system sends out a drag event with action type ACTION_DRAG_ENDED to indicate that the drag operation is over. The drag event listener receives a ACTION_DRAG_EXITED action after the user has moved the drag shadow outside the bounding box of the View.ĭropped − The user releases the dragged item within the bounding box of a View. The listener may choose to alter its View object's appearance in response to the event or can react by highlighting its View. System sends ACTION_DRAG_ENTERED action followed by ACTION_DRAG_LOCATION action to the registered drag event listener for the View where dragging point enters. To continue to receive drag events, including a possible drop event, a drag event listener must return true, If the drag event listener returns false, then it will not receive drag events for the current operation until the system sends a drag event with action type ACTION_DRAG_ENDED.Ĭontinuing − The user continues the drag. Next, the system sends a drag event with action type ACTION_DRAG_STARTED to the registered drag event listeners for all the View objects in the current layout. It then displays the drag shadow on the device. The system first responds by calling back to your application to get a drag shadow. The arguments inside startDrag() method provide the data to be dragged, metadata for this data, and a callback for drawing the drag shadow. Started − This event occurs when you start dragging an item in a layout, your application calls startDrag() method to tell the system to start a drag. There are basically four steps or states in the drag and drop process − As of API 11 drag and drop of view onto other views or view groups is supported.The framework includes following three important components to support drag & drop functionality −
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#Dropped objects calculator mobile android#
Android drag/drop framework allows your users to move data from one View to another View in the current layout using a graphical drag and drop gesture.