java getContext() 不存在
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getContext() doesn't exist
提问by LalienX
So I have been going through the Android Developer training on the official site and there is a point where they want us to finally instantiate our database.
所以我一直在官方网站上接受 Android 开发人员培训，他们希望我们最终实例化我们的数据库。
So they tell us to use this snippet of code:
所以他们告诉我们使用这段代码：
FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(getContext());
However, I'm getting an error for the getContext()method. It states that it cannot find a symbol for that method.
但是，我收到该getContext()方法的错误。它指出它找不到该方法的符号。
So I searched the source and that method in the View class just cannot be found. Is this a deprecated method? And if this isn't an option, is there any other way we can grab the context of a view?
所以我搜索了源代码，但在 View 类中找不到该方法。这是不推荐使用的方法吗？如果这不是一个选项，还有其他方法可以获取视图的上下文吗？
Thank you!
谢谢！
采纳答案by lcsvcn
The line of code you pass is:
您传递的代码行是：
FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(geContext());
It should work if you substitute for any of these code lines :
如果您替换任何这些代码行，它应该可以工作：
FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(getContext());
Or
或者
FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(getApplicationContext());
Or
或者
FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(this);
The android developer documentation of the Context:
Context 的 android 开发者文档：
https://developer.android.com/reference/android/content/Context.html
https://developer.android.com/reference/android/content/Context.html
You might found helpful too look in this question, that explains what is Context for:
您可能会发现在这个问题中也很有帮助，它解释了什么是上下文：
回答by Luis
Thats how I made it
我就是这样做到的
MainActivity
FeedReaderContract contract = new FeedReaderContract(this);
I edited the constructor of the class FeedReaderContract
mDbHelper = new FeedReaderDbHelper(getContext());
The method getContext()
public Context getContext() { return context; }
主要活动
FeedReaderContract contract = new FeedReaderContract(this);
我编辑了类 FeedReaderContract 的构造函数
mDbHelper = new FeedReaderDbHelper(getContext());
方法 getContext()
公共上下文 getContext() { 返回上下文；}
回答by Nikhil Jain
In your code you have used geContext() change it to getContext()or getApplicationContext()or if calling the object from inside an activity simply pass this
在你的代码已经使用geContext（）将其更改为getContext()或getApplicationContext()，或者调用从活动对象里面即速this
回答by Eran
The View class does have a getContextmethod.
View 类确实有一个getContext方法。
You either have a typo, or your code is not located in a non-static method of a sub-class of View.
您要么有错别字，要么您的代码未位于 View 子类的非静态方法中。
