我使用拖放操作将视图拖动到目标上。 我很难弄清楚如何拖动原始视图时拖动它是不可见的,如果拖动结束则再次可见,但它不会被丢弃在目标上。
final TextView dragText1 = (TextView) v.findViewById(R.id.text_user_drags_1);
dragText1.setOnTouchListener(new MyTouchListener());
final TextView target1 = (TextView) v.findViewById(R.id.text_target_1);
target1.setOnDragListener(new MyDragListener());
private final class MyTouchListener implements View.OnTouchListener {
public boolean onTouch(View view, MotionEvent motionEvent) {
if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
ClipData data = ClipData.newPlainText("", "");
DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
view.startDrag(data, shadowBuilder, view, 0);
// view.setVisibility(View.INVISIBLE);
return true;
} else {
//view.setVisibility(View.VISIBLE);
return true;
}
}
}
class MyDragListener implements OnDragListener {
@Override
public boolean onDrag(View v, DragEvent event) {
int action = event.getAction();
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
TextView draggedView2 = (TextView) event.getLocalState();
ViewGroup owner1 = (ViewGroup) draggedView2.getParent();
owner1.setVisibility(View.INVISIBLE);
Log.d(TAG, "DRAG STARTED");
break;
case DragEvent.ACTION_DRAG_ENTERED:
Log.d(TAG, "DRAG ENTERED");
break;
case DragEvent.ACTION_DRAG_EXITED:
Log.d(TAG, "DRAG EXITED");
break;
case DragEvent.ACTION_DROP:
// Dropped, reassign View to ViewGroup
TextView draggedView = (TextView) event.getLocalState();
ViewGroup owner = (ViewGroup) draggedView.getParent();
owner.setVisibility(View.INVISIBLE);
Log.d(TAG, "DRAG DROPPED");
break;
case DragEvent.ACTION_DRAG_ENDED:
if(event.getAction() == DragEvent.ACTION_DROP){
TextView draggedView3 = (TextView) event.getLocalState();
ViewGroup owner3 = (ViewGroup) draggedView3.getParent();
owner3.setVisibility(View.INVISIBLE);
}
TextView draggedView4 = (TextView) event.getLocalState();
ViewGroup owner4 = (ViewGroup) draggedView4.getParent();
owner4.setVisibility(View.VISIBLE);
Log.d(TAG, "DRAG ENDED");
default:
break;
}
return true;
}
}
答案 0 :(得分:1)
您必须使用事件ACTION_DRAG_LOCATION。在此事件中,您将获得视图的拖动X,并将alpha应用于与拖动百分比成比例的视图。因此,如果您的视图被拖了50%,则应用0.5的alpha值;拖动75%,应用.25的alpha等等(alpha =(100f - drag_percent)/ 100f