onDrag 类:
private class ChoiceDragListener implements OnDragListener {
@Override
public boolean onDrag(View v, DragEvent event) {
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
// no action necessary
break;
case DragEvent.ACTION_DRAG_ENTERED:
// no action necessary
break;
case DragEvent.ACTION_DRAG_EXITED:
// no action necessary
break;
case DragEvent.ACTION_DROP:
// handle the dragged view being dropped over a drop view
View view = (View) event.getLocalState();
dropTarget = (RelativeLayout) v;
dropped = (RelativeLayout) view;
tagDropped = dropped.getTag().toString();
Log.i("tagDropped", "" + tagDropped);
tagDropTarget = dropTarget.getTag().toString();
Log.i("tagDropTarget", "" + tagDropTarget);
matchTag();
break;
case DragEvent.ACTION_DRAG_ENDED:
// no action necessary
break;
default:
break;
}
return true;
}
}
ChoiceTouchListener 类:
private final class ChoiceTouchListener implements OnTouchListener {
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
/*
* Drag details: we only need default behavior - clip data could
* be set to pass data as part of drag - shadow can be tailored
*/
ClipData data = ClipData.newPlainText("", "");
DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(
view);
// start dragging the item touched
view.startDrag(data, shadowBuilder, view, 0);
return true;
} else {
return false;
}
}
}
现在我想将对象移动到其拖动的原始位置
我有这样的搜索但没有回答任何一个如果没有放在目标上,则使用 onDraglistener 动画拖放以返回到原始位置 https://stackoverflow.com/questions/17986044/drag-and-drop-with-ondraglistener-animate-to-go-back-to-original-position-if-not
首先获取拖动器控件和拖动接收器控件之间的距离:textview1
是拖动器控件textview2
是拖动接收器控件
//if text view2 is below textview one and text view 2 is on the right of text view one
int topMargin=textview2_top_margin - textview1_top_margin
int leftMargin=textview2_left_margin - textview1_left_margin
public void animation() {
Animation animation = new TranslateAnimation(left_margin, 0, topMargin, 0);
animation.setDuration(1000);
controlToAnimate.startAnimation(animation);
}
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