EnableListAdapter 中的上下文
我创建了一个 ExpandableListAdapter 类，我需要从访问它的活动向它发送上下文。
MyActivity.class:
MenuExpandableListAdapter.useInstanceContext(getApplicationContext());
MyExpandableListAdapter.class:
static Context context;
public static void useInstanceContext(Context applicationContext) {
context = applicationContext;
}
上面的代码可以工作，但这也可以：
MenuExpandableListAdapter.useInstanceContext(this.getApplicationContext());
有什么区别？这是传递上下文的好方法吗？我仍在尝试完全理解上下文。
I have created an ExpandableListAdapter class and I need to send it the context from the activity that is accessing it.
MyActivity.class:
MenuExpandableListAdapter.useInstanceContext(getApplicationContext());
MyExpandableListAdapter.class:
static Context context;
public static void useInstanceContext(Context applicationContext) {
context = applicationContext;
}
The above code works, but this also works:
MenuExpandableListAdapter.useInstanceContext(this.getApplicationContext());
What's the difference? Is this a good way to pass context? I'm still trying to fully understand context.
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评论（3）
为了访问资源和其他一些东西，上下文是必要的。因此，应用程序和活动上下文都有效。但良好的实践是紧抓最有效的最小事情，即您的案例中的活动。因此，我建议您使用新方法：
此外，在您的示例中，调用之间没有区别。
this只是对当前对象的引用。Context is necessary in order to get access to the resources and some other things. So, both - application and activity contexts work. But a good practice is tight to the smallest thing, which works, which is activity in your case. So, I would suggest new way for you:
Also, in your example, there is no difference between the calls.
thisis just the reference to the current object.this指的是当前正在执行代码的对象，如果该方法是在同一个类中声明的，并且不是static的，那么调用也是一样的：and
（类成员也是如此）
thisrefers to the object that is currently executing code, if the method is declared in the same class, and is not static, it is the same to call:and
(The same applies to class members)
getApplicationContext() 方法将通过使用调用/当前对象隐式调用。
其次，您显式地给出调用/当前对象，因为这是始终引用调用对象的特殊对象。
我建议你使用这个，
因为根据我的阅读，这是一个很好的做法。
The getApplicationContext() method will called by using calling/current object implicitly.
in second you are giving calling/current object explicitly because this is special object that is always refer to calling object.
i suggest you to use this
because as per my reading it's good practice.