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Cannot find the character "OnKeyListener"

What am I missing? I feel stupid when I have to post this, but maybe someone else will see the (probably obvious) error that I am making.

import android.app.Activity;
import android.os.Bundle;
import android.view.*;
import android.widget.*;

public class Primes extends Activity implements OnKeyListener
{
...
}

Error:

[javac] ...Primes.java:9: cannot find symbol
[javac] symbol: class OnKeyListener
[javac] public class Primes extends Activity implements OnKeyListener
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1 answer

This is a nested interface .

public class Primes extends Activity implements View.OnKeyListener
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