// Touched
public class ChoiceTouchListener implements OnTouchListener {
public boolean onTouch(View view, MotionEvent motionEvent) {
switch (motionEvent.getAction()) {
case MotionEvent.ACTION_MOVE:
return true;
case MotionEvent.ACTION_DOWN:
Viewed = String.valueOf(view.getId());
ClipData data = ClipData.newPlainText("", "");
DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
// Drag Function When Item Touched
view.startDrag(data, shadowBuilder, view, 0);
return true;
case MotionEvent.ACTION_UP:
return true;
default:
return true;
}
}
}
private class ChoiceDragListener implements OnDragListener {
// onDrag Method, imagine we dragging numbers from display TextView
@Override
public boolean onDrag(View v, DragEvent event) {
// Android has onDrag action types. there are some kind of action
switch (event.getAction()) {
// if drag stared
case DragEvent.ACTION_DRAG_STARTED:
break;
// if drag entered software
case DragEvent.ACTION_DRAG_ENTERED:
break;
// if drag exited, stopped or something
case DragEvent.ACTION_DRAG_EXITED:
break;
// main case, if drag dropped what we do...
case DragEvent.ACTION_DROP:
// handle the dragged view being dropped over a drop view
View view = (View) event.getLocalState();
// stop displaying the view where it was before it was dragged
// ************* view.setVisibility(View.KEEP_SCREEN_ON);
// view dragged item, where numbers will be dragged
dropTarget = (TextView) v;
// view dropped item, that will be dropped in drag TextView
dropped = (TextView) view;
// view result place, when make math operation, show results
resultPlace = (TextView) findViewById(R.id.calcResult);
// simple debug
// ****** resultPlace.setText( dropped.getText() + " " + dropTarget.getText() );
// if an item has already been dropped here, there will be a tag
Object tag = dropTarget.getTag();
// if there is already an item here, set it back visible in its
// original place
if (tag != null)
{
// the tag is the view id already dropped here
int existingID = (Integer) tag;
// set the original view visible again
findViewById(existingID).setVisibility(View.VISIBLE);
}
// set the tag in the target view being dropped on - to the ID
// of the view being dropped
dropTarget.setTag(dropped.getId());
// show results
resultPlace.setText( dropped.getText() + " " + dropTarget.getText() + " " + dropped.getText() );
break;
// if drag ended, we did it already successfully
case DragEvent.ACTION_DRAG_ENDED:
break;
// what do default
default:
break;
}
return true;
}
}
我有非常简单的触摸和拖动类。 我唯一的问题是,当我拖动项目并放入某个布局时,我的项目也保持在旧位置。 android中是否有任何方法可以检测我正在触摸的项目并在删除后将其删除?
我有一个小应用程序,点击数字并在仪表板中拖动,然后重复它并将仪表板中的所有项目拖动到X和Y位置。这就是为什么我想要清空旧的数字空间来创建另一个。
...谢谢
答案 0 :(得分:1)
我在程序中最终得到类似的东西,希望它有所帮助。
View.OnDragListener DropListener = new View.OnDragListener() {
@Override
public boolean onDrag(View v, DragEvent event) {
int dragEvent = event.getAction();
switch (dragEvent) {
case DragEvent.ACTION_DRAG_ENTERED:
Log.i("Drag Event", "Entered");
break;
case DragEvent.ACTION_DRAG_EXITED:
Log.i("Drag Event", "Exited");
break;
case DragEvent.ACTION_DROP:
TextView target = (TextView) v;
TextView dragged = (TextView) event.getLocalState();
target.setText((CharSequence) dragged.getText());
dragged.setText("");
break;
}
return true;
}
};
答案 1 :(得分:0)
您可以在触控侦听器中获取视图的父级。在下面的操作中,将父视图保留在全局变量中,当视图删除时,使用removeView(View v)函数将其从父视图中删除。