Android Hardware Back Key not working

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http://stackoverflow.com – I have an android app with WebView but when i press the hardware back button, nothing happens. I want the user to be taken back to the previous page loaded on the Webview. What am i missing in this code: package kenya.cancerbank; import tscolari.mobile_sample.R; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.webkit.WebSettings; import android.webkit.WebView; import android.webkit.WebViewClient; public class CancerBank extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedIn (HowTos)