在 Toast 上显示 ArrayList 内容

问题描述

我有一个 listView，我想打印包含所选项目的 arrrayList.

I have a listView and I want to print the arrrayList which contains the selected items.

我可以展示我每次选择的选择.即，如果我选择一个选项，我可以将其打印在吐司中(我在代码中将其标记为注释)，但我想将整个选项打印在一起.有什么帮助吗?

I can show the choice that I choose every time. i.e. if I select a choice, I can print it in a toast (I mark it in my code as a comment), but I want to print the whole choices together.Any help please?

谢谢..

推荐答案

如果我理解正确，您想在 Toast 中显示 arrayList 的内容.

If I understand correctly, you want to display the contents of your arrayList in a Toast.

1. 就像 donfuxx 所说，您需要在 onclicklistener 之外创建 arrayList.
2. 当用户单击一个项目时，它将被添加到您的 arrayList 中.

3. 然后遍历列表以填充名为 allItems 的字符串，然后在 Toast 中显示 allItems.

1. Like donfuxx said, you need to create your arrayList outside of your onclicklistener.
2. As the user clicks an item, it will be added to your arrayList.

3. Then loop over the list to fill a string called allItems, then show allItems in a toast.

ArrayList<String> checked = new ArrayList<String>();

listView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view,
            int position, long id) {

        String listItem = (String) listView.getItemAtPosition(position);

        if(!checked.contains(listItem)){ //optional: avoids duplicate Strings in your list
            checked.add((position+1), listItem);
        }
        String allItems = ""; //used to display in the toast

        for(String str : checked){
          allItems = allItems + "\n" + str; //adds a new line between items
        }

        Toast.makeText(getApplicationContext(),allItems, Toast.LENGTH_LONG).show();
    }
});

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