customwebview.java

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.webkit.WebView;

public class CustomWebView extends WebView {

    public CustomWebView(Context context) {
        super(context);
    }

    public CustomWebView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public CustomWebView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void onWindowFocusChanged(boolean hasWindowFocus) {
        try{
            super.onWindowFocusChanged(hasWindowFocus);
        } catch(NullPointerException e){
            Log.v("TAG", "Catched");
        }
    }
}