getContext（）不存在

Question

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.

So they tell us to use this snippet of code:

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.

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?

Thank you!

Answer 1

The line of code you pass is:

FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(geContext());

It should work if you substitute for any of these code lines :

FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(getContext());

Or

FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(getApplicationContext());

Or

FeedReaderDbHelper mDbHelper = new FeedReaderDbHelper(this);

The android developer documentation of the Context:

https://developer.android.com/reference/android/content/Context.html

You might found helpful too look in this question, that explains what is Context for:

What is 'Context' on Android?

Answer 2

Thats how I made it

1. MainActivity

   FeedReaderContract contract = new FeedReaderContract(this);

2. I edited the constructor of the class FeedReaderContract

   mDbHelper = new FeedReaderDbHelper(getContext());

3. The method getContext()

   public Context getContext() { return context; }

Answer 3

在您的代码中，您使用了geContext（）将其更改为getContext()或getApplicationContext()或者如果从活动内部调用该对象，则只需传递this

Answer 4

The View class does have a getContext method.

You either have a typo, or your code is not located in a non-static method of a sub-class of View.