在我的應用程序中,我想設計一個視圖組。如果將某些內容(如文本視圖)添加到此視圖組中,則textview可以接受DragEvent。 我試過用下面如何在android4.0中使視圖接受放置事件?
@Override
public void addView(View child) {
super.addView(child);
child.setOnDragListener(new ViewDragger());
child.setOnLongClickListener(new DragStarter()) ;
}
class DragStarter implements OnLongClickListener{
@Override
public boolean onLongClick(View v) {
ClipData.Item item = new ClipData.Item((CharSequence) v.getTag());
ClipData dragData = new ClipData((CharSequence) v.getTag(),new String[]{"*/*"},item);
View.DragShadowBuilder builder = new View.DragShadowBuilder(v);
boolean started = v.startDrag(dragData, builder, v , 0) ;
System.out.println("start drag " + started+" " + v);
return false;
}
}
class ViewDragger implements OnDragListener{
@Override
public boolean onDrag(View v, DragEvent event) {
if(event.getAction() == DragEvent.ACTION_DRAG_ENDED){
System.out.println("drag end");
}
if(event.getAction() == DragEvent.ACTION_DRAG_ENTERED){
System.out.println("drag entered.");
}
if(event.getAction() == DragEvent.ACTION_DRAG_EXITED){
System.out.println("drag existed.");
}
if(event.getAction() == DragEvent.ACTION_DRAG_LOCATION){
System.out.println("drag location");
}
if(event.getAction() == DragEvent.ACTION_DRAG_STARTED){
System.out.println("drag started.");
}
if(event.getAction() == DragEvent.ACTION_DROP){
System.out.println("action drop");
return true ;
}
System.out.println("view-->" + v);
return false;
}
}`
的代碼,但如我所料的功能不運行。當我長按一個文本視圖時,所有DragListeners都會被打開,並且只打印「拖動開始」和「拖動結束」。我在APIDemo中閱讀了演示,但我希望拖動事件可以用於常用的小部件。有什麼建議? THX