SwipeRefreshLayout下拉刷新

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="mirror.android.miniweb.MiniBrowser" >
    
    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swipe_contain"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        
        <WebView
            android:id="@+id/web_show"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>
        
    </android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

package mirror.android.miniweb;

import android.app.Activity;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.EditText;
import android.widget.Toast;


public class MiniBrowser extends Activity {
    
    private WebView webView;
    private SwipeRefreshLayout swipeRefresh;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_mini_browser);
        
        //SwipeRefresh
        swipeRefresh = (SwipeRefreshLayout)findViewById(R.id.swipe_contain);
        swipeRefresh.setOnRefreshListener(new OnRefreshListener() {
            @Override
            public void onRefresh() {
                //重新加载刷新页面
                webView.loadUrl(webView.getUrl());
            }
        });
        swipeRefresh.setColorSchemeResources(android.R.color.holo_blue_light, 
                                             android.R.color.holo_red_light, 
                                             android.R.color.holo_orange_light, 
                                             android.R.color.holo_green_light);
        
        //WebView
        webView = (WebView)findViewById(R.id.web_show);
        webView.loadUrl("http://www.baidu.com");
        //添加javaScript支持  
        webView.getSettings().setJavaScriptEnabled(true);
        //取消滚动条  
        webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        //触摸焦点起作用  
        webView.requestFocus(); 
        //点击链接继续在当前browser中响应   
        webView.setWebViewClient(new WebViewClient(){
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }
        });
        //设置进度条
        webView.setWebChromeClient(new WebChromeClient(){
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                if(newProgress == 100){
                    //隐藏进度条
                    swipeRefresh.setRefreshing(false);
                }else if(!swipeRefresh.isRefreshing()){
                    swipeRefresh.setRefreshing(true);
                }
            }
        });
    }
}