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