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DragStartHelper

public class DragStartHelper
extends Object

java.lang.Object
↳	android.support.v13.view.DragStartHelper

DragStartHelper is a utility class for implementing drag and drop support.

It detects gestures commonly used to start drag (long click for any input source, click and drag for mouse).

It also keeps track of the screen location where the drag started, and helps determining the hot spot position for a drag shadow.

Implement DragStartHelper.OnDragStartListener to start the drag operation:

 DragStartHelper.OnDragStartListener listener = new DragStartHelper.OnDragStartListener {
     protected void onDragStart(View view, DragStartHelper helper) {
         View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view) {
             public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) {
                 super.onProvideShadowMetrics(shadowSize, shadowTouchPoint);
                 helper.getTouchPosition(shadowTouchPoint);
             }
         };
         view.startDrag(mClipData, shadowBuilder, mLocalState, mDragFlags);
     }
 };
 mDragStartHelper = new DragStartHelper(mDraggableView, listener);

Once created, DragStartHelper can be attached to a view (this will replace existing long click and touch listeners):

 mDragStartHelper.attach();

It may also be used in combination with existing listeners:

 public boolean onTouch(View view, MotionEvent event) {
     if (mDragStartHelper.onTouch(view, event)) {
         return true;
     }
     return handleTouchEvent(view, event);
 }
 public boolean onLongClick(View view) {
     if (mDragStartHelper.onLongClick(view)) {
         return true;
     }
     return handleLongClickEvent(view);
 }

Summary

Nested classes
`interface`	`DragStartHelper.OnDragStartListener` Interface definition for a callback to be invoked when a drag start gesture is detected.

Public constructors
`DragStartHelper(View view, DragStartHelper.OnDragStartListener listener)` Create a DragStartHelper associated with the specified view.

Public methods
`void`	`attach()` Attach the helper to the view.
`void`	`detach()` Detach the helper from the view.
`void`	`getTouchPosition(Point point)` Compute the position of the touch event that started the drag operation.
`boolean`	`onLongClick(View v)` Handle a long click event.
`boolean`	`onTouch(View v, MotionEvent event)` Handle a touch event.

Inherited methods

From class


  
    java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long millis, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long millis)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public constructors