Question

我有一个网格视图，我设置了一个包含图像视图数组列表的适配器。我想从网格视图中拖动一个项目并将其放入另一个布局。我面临的问题是如何将触摸侦听器设置为单个网格视图项，以便我可以将其放入目标中。如果我在网格视图中设置ontouchlistener，它将选择整个网格视图而不是单个项目。请帮我............... 我试过这段代码：

        gridview.setOnItemClickListener(new MyOnItemClickListener());
        gridview.setOnDragListener(new MyOnDragListener());
        private final class MyTouchListener implements 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);
         return true;
        } else {
        return false;
       }
       }
         final class MyOnDragListener implements OnDragListener{

    Drawable enterShape = getResources().getDrawable(R.drawable.shape_droptarget);
    Drawable historyDrawer;
    @Override
    public boolean onDrag(View v, DragEvent event) {
        LocalLogger.LOGGER.info("Under on drag listener");
        switch(event.getAction()){
        case DragEvent.ACTION_DRAG_STARTED:
            break;
        case DragEvent.ACTION_DRAG_ENTERED:
            historyDrawer=v.getBackground();
            v.setBackground(enterShape);
            break;
        case DragEvent.ACTION_DRAG_EXITED:
            v.setBackground(historyDrawer);
            break;
        case DragEvent.ACTION_DROP:
            break;
        case DragEvent.ACTION_DRAG_ENDED:
            break;
        }
        return false;
    }

}

Answer 1

使用OnItemLongClickListener查找长按的孩子。

Answer 2

将其添加到网格中，就像这样 -

gridView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

        public boolean onItemLongClick(AdapterView<?> arg0, View view, int position, long arg3) {
            ClipData data = ClipData.newPlainText("", "");
            View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
            view.startDrag(data, shadowBuilder, view, 0);
            return true;
        }
    });

Answer 3

由于您只在触控侦听器上使用ACTION_DOWN，因此您可以使用onItemClickListener或onItemLongClickListener进行拖动。

grid.setOnItemLongClickListener(new OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View v,
                int pos, long id) {
            ClipData data = ClipData.newPlainText("", "");
            DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(
                    v);
            // start dragging the item touched
            v.startDrag(data, shadowBuilder, v, 0);
            return false;
        }
    });

Answer 4

我接下来解决了这个问题：

gridView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
     float currentXPosition = motionEvent.getX();
     float currentYPosition = motionEvent.getY();
     int position = gridView.pointToPosition((int) currentXPosition, (int) currentYPosition);
     View v = gridView.getChildAt(position);
     ClipData.Item item = new ClipData.Item("" + position); // here you send any data you want, I sent position
     String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_HTML};
     ClipData data = new ClipData("" + position, mimeTypes, item);
     View.DragShadowBuilder shadow = new View.DragShadowBuilder(v);
     view.startDrag(data, shadow, null, 0);
}

如何从gridview拖动项目并放入另一个布局

4 个答案: