前幾天想用contextMenu來實現recyclerview中的批量刪除的功能,於是去官網找了找contextMenu是使用方法,通過registerForContextMenu(View v)註冊了contextmenu後,發現onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)沒有被調用。
上網找了找,發現可以在ViewHolder中實現ContextMenu,通過給RecyclerView中的每個Item設置監聽器創建菜單,貼出例子如下:
private class myHolder extends RecyclerView.ViewHolder{
public myHolder(View itemView){
super(itemView);
title = (TextView) itemView.findViewById(R.id.list_item_title);
date = (TextView) itemView.findViewById(R.id.list_item_date);
mCheckBox = (CheckBox) itemView.findViewById(R.id.checkbox);
itemView.setOnCreateContextMenuListener(new View.OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
MenuInflater inflater = getActivity().getMenuInflater();
MenuItem delete = menu.add(Menu.NONE, 1, 1, "刪除");
MenuItem delete_much = menu.add(Menu.NONE, 2, 2, "批量刪除");
delete.setOnMenuItemClickListener(listener); //響應點擊事件
delete_much.setOnMenuItemClickListener(listener);
Log.e(TAG, "in context menu");
}
});
MenuItem.OnMenuItemClickListener listener=new MenuItem.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) { //設置每個菜單的點擊動作
switch (item.getItemId()){
case 1:
//do something
return true;
case 2:
//do something
default:
return true;
}
}
};
});
}
另外我發現在如果已經通過registerForContextMenu(View v)方法註冊過菜單的,並且重寫了onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)方法,那麼當點擊的時候倆個方法都會被執行。