在一个ArrayAdapter更新项目 [英] Update an item in the arrayadapter

问题描述

我有一个arrayadapter.I可以将项目添加到这个arrayadapter，但有时我需要在更新这个adapter.I项目研究了互联网，并在适配器然后我做了这样无法找到有关更新特定项目什么

I have an arrayadapter.I can add items to this arrayadapter,but sometimes I need the update an item in this adapter.I researched the internet and can't find anything about update specific item in the adapter then I did like this:

Integer test=randomAdapter.getPosition(user);
randomAdapter.remove(user);
randomAdapter.insert(updated_user,test);
randomAdapter.notifyDataSetChanged();

在此code 用户是jsonobject.I我得到那么我删除它并添加uptated用户数据到旧的对象position.This这个项目的位置似乎works.But我不知道这是更新项目，所以我要问你一个好主意。

In this code user is a jsonobject.I am getting position of this item then I am removing it and adding uptated user data into old object position.This seems works.But I don't know this is a good idea for update an item so I am asking to you.

如果这是一个坏主意，应该如何？

If this is a bad idea,how should be ?

推荐答案

这是 ArrayAdapter 保持对数组的引用或列表，它使用的对象。任何的方法，如添加（...），删除（...）或直接插入阵列/列表（...）行为，也可用于同步使他们陈述线程安全的。

An ArrayAdapter maintains a reference to the array or List of objects that it uses. Any of the methods such as add(...), remove(...) or insert(...) act directly on the array / list and also used synchronized statements making them thread-safe.

您的做法可能会稍微显得啰嗦，但它是安全的处事任何其他方式的一种方式。你当然可以，操纵原始数组/列出自己，但如果你需要线程安全，你必须同步添加到您自己的code。为什么要重新发明轮子？

Your approach may seem slightly long-winded but it's as safe a way of doing things as any other way. You could, of course, manipulate the original array / list yourself but if you need thread-safety you'd have to add synchronization to your own code. Why re-invent the wheel?

如果你想看看源$ C ​​$ C为 ArrayAdapter 是<一个href=\"https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/android/widget/ArrayAdapter.java\"相对=nofollow>这里

If you want to look at the source code for ArrayAdapter it's here

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