作者:louis | 来源:互联网 | 2022-12-02 17:43
我正在尝试在ConstraintLayout中进行拖放,如下所示:
override fun onLongClick(v: View?): Boolean {
val dragData = ClipData.newPlainText("", "")
val myShadow = View.DragShadowBuilder(v)
if(Build.VERSION.SDK_INT>= Build.VERSION_CODES.N) {
startDragAndDrop(dragData, myShadow, v, 0)
}else{
startDrag(dragData, myShadow, v, 0)
}
return true
}
我的阻力听众是
private val mDragListen = View.OnDragListener { v, event ->
val view = event.localState as TextView
when (event.action) {
DragEvent.ACTION_DRAG_STARTED -> {
layoutParams = view.layoutParams as ConstraintLayout.LayoutParams?
true
}
DragEvent.ACTION_DRAG_ENTERED -> {
true
}
DragEvent.ACTION_DRAG_LOCATION ->
true
DragEvent.ACTION_DRAG_EXITED -> {
true
}
DragEvent.ACTION_DROP -> {
layoutParams?.marginStart = event.x.toInt()
layoutParams?.topMargin = event.y.toInt()
view.layoutParams = layoutParams
view.invalidate()
true
}
DragEvent.ACTION_DRAG_ENDED -> {
when (event.result) {
true ->
Toast.makeText(activity, "The drop was handled.", Toast.LENGTH_LONG)
else ->
Toast.makeText(activity, "The drop didn't work.", Toast.LENGTH_LONG)
}.show()
true
}
else -> {
Log.e("DragDrop Example", "Unknown action type received by OnDragListener.")
false
}
}
}
这是我的xml
这是可行的,但没有达到预期效果,请参见输出。