现在的问题是很简单的。 但我想知道我们究竟让我们引用的GUI元素？ 正如这是确定的最佳地点：

The question is quite simple. But I want to know where exactly do we make our references to the gui elements? As in which is the best place to define:

final EditText edit =  (EditText) findViewById(R.id.text_xyz);
 edit.getText.tostring();

当我尝试做了默认的OnCreate（）内我得到空值。 因此，最佳实践，做u建议一个单独的类来引用main.xml中这些已经定义GUI元素。从这里我们可以称之为像gettext的或的setText这些元素的各种方法？

When I try it doing inside the default oncreate() I get null values. So for best practice, do u recommend a separate class for referring these already defined gui elements in main.xml. From here we can call various methods of these elements like gettext or settext?

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嗯，这取决于你的需要。很多时候，我把我提到的小部件的活动（为一类字段） - 并将它们在的onCreate 方法。我认为这是一个好主意 也许你空的原因是，你试图调用 findViewById（）设置之前内容查看（）在你的的onCreate（）方法 - 请检查

Well, it depends on your needs. Very often I keep my references to widgets in activity (as a class fields) - and set them in onCreate method. I think that is a good idea Probably the reason for your nulls is that you are trying to call findViewById() before you set contentView() in your onCreate() method - please check that.