Android Adapter getView方法:是否调用super.getView? [英] Android Adapter getView Method: call super.getView or not?

问题描述

我看到了直接使用convertView参数的getView实现:

I saw getView implementations that used convertView parameter directly:

if(convertView!=null)
    ...
return convertView

另一个实现调用super.getView:

Another implementations call super.getView:

View view = super.getView( position, convertView, parent );
if(view!=null)
    ...
return view

我的问题是，什么是正确的方法?

My question is, What is the right method?

推荐答案

我想您是在谈论

I guess you are talking about Adapter.getView(). Which adapter are you extending?

大多数适配器本身没有getView()的实现，并希望您在自己放大视图之前检查convertView是否为null.

Most adapters have no implementation of getView() themselves and expect that you check if convertView is null before inflating a view one yourself.

我说大多数适配器，因为有例外.如果从第三方-lib继承适配器的子类，则该适配器实际上可能提供getView()的实现并处理视图回收.在那种情况下，您确实应该调用超类.

I say most adapters since there are exceptions. If you sub-class an Adapter from a third party -lib the adapter might actually provide an implementation of getView() and handle the view recycling. In that case you really should call the super-class.

此外，如果您查看

Also, if you take a look at the code for CursorAdapter it actually has an implementation of getView()

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