WebView browses web pages, opens it in the APP without calling the system browser

package com.example.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;

public class MainActivity1 extends Activity{
	EditText urlEditText;
	WebView showView;
	Button button;
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate (savedInstanceState);
		setContentView(R.layout.main);
		urlEditText = (EditText)findViewById(R.id.url);
		showView = (WebView)findViewById(R.id.show);
        WebSettings settings = showView.getSettings();  
        //fit to the screen  
        settings.setUseWideViewPort(true);  
        settings.setSupportZoom(true);  
//      settings.setLayoutAlgorithm(LayoutAlgorithm.SINGLE_COLUMN);  
//      settings.setLoadWithOverviewMode(true);  
//      settings.setBuiltInZoomControls(true);  
        settings.setJavaScriptEnabled(true);  
        showView.setWebViewClient (new WebViewClient () {
            public boolean shouldOverrideUrlLoading(WebView view, String url)
                                   { // Rewrite this method to indicate that clicking on the link in the webpage still jumps in the current webview, not the browser
                                           view.loadUrl(url);
                                           return true;
                                   }
            });
		button = (Button)findViewById(R.id.button);
		button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				String urlStr = urlEditText.getText().toString();
				if(urlStr.startsWith("http://www.")){
					showView.loadUrl(urlStr);
				} else if(urlStr.startsWith("www.")){
					showView.loadUrl("http://"+urlStr);
				} else {
					showView.loadUrl("http://www."+urlStr);
				}
			}
		});
	}
}