通過拖放操作Android卡片視圖更改位置

Question

我想使我的卡片視圖在片段（導航繪圖器）內能夠通過拖放來更改列表中的位置。

我的佈局文件結構：

FrameLayout{ 
LinearLayout{ 
cardview_1 
card_view_2}} 

Answer 1

使用recyclerView，使rowItemLayout.xml或columnItemLayout.xml與cardView作爲根查看。 然後使用recyclerView的功能，如：

ItemTouchHelper itemTouchHelper = new ItemTouchHelper(createHelperCallback()); 
itemTouchHelper.attachToRecyclerView(recyclerView); 
private ItemTouchHelper.Callback createHelperCallback() { 
    ItemTouchHelper.SimpleCallback simpleItemTouchCallback = 
      new ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP | ItemTouchHelper.DOWN, 
        ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) { 
       @Override 
       public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, 
             RecyclerView.ViewHolder target) { 
        moveItem(viewHolder.getAdapterPosition(), target.getAdapterPosition()); 
        return true; 
       } 

       @Override 
       public void onSwiped(final RecyclerView.ViewHolder viewHolder, int swipeDir) { 
        deleteItem(viewHolder.getAdapterPosition()); 
       } 
      }; 
    return simpleItemTouchCallback; 
} 
private void moveItem(int oldPos, int newPos) { 

    ListItem item = (ListItem) listData.get(oldPos); 
    listData.remove(oldPos); 
    listData.add(newPos, item); 
    adapter.notifyItemMoved(oldPos, newPos); 
} 

private void deleteItem(final int position) { 
    listData.remove(position); 
    adapter.notifyItemRemoved(position); 
}