Why am I receiving an error when trying to use DisplayMetrics in Android?

Question

I'm just starting with Android programming, and I receive an error in the following code:

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);

The first line is fine according to Eclipse. But in the second line it's telling me that "getWindowManager"'s return type is missing. I don't understand this. When I search the internet on how to use this code, everyone is doing the same thing. Yet Eclipse is giving me an error.

Answer 1

If this code is being used in a View instead of an Activity, you need to do something like

((Activity) getContext()).getWindowManager().getDefaultDisplay().getMetrics(dm);

or

((WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE))
  .getDefaultDisplay().getMetrics(dm);

Answer 2

Providing more code would help people to help you debugging.

From your OP,

But in the second line it's telling me that "getWindowManager"'s return type is missing

getWindowManager is a method of Activity so make sure you have your code inside an activity (extends Activity))