Android :: White Screen Appears In Main Activity?

public class Profile extends Activity{
WebView prof_webv;
private String selected_username;
private static final String INDEX = "http://14.143.227.140";

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
prof_webv = (WebView) findViewById(R.id.mainwebview);
prof_webv.getSettings().setJavaScriptEnabled(true);
prof_webv.getSettings().setSupportZoom(false);
prof_webv.loadUrl(INDEX);}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) ) {
finish();
return true;
}
return super.onKeyDown(keyCode, event);
}
}

This is my new Activity for a WebView. When the user clicks back, I simply want to close this Activity and return to my previous one. Notice, I put "onKeyDown" -> Finish. However, it's not working. Instead, I click "back", a blank white screen comes up.. (it doesn't even hit that onKeyDown Statement when I try to debug it)! When I hit "back" the second time, then it will go back to my previous Activity.