WebView请求页面的使用

简单的三行代码既可以实现

 private String url="http://2014.qq.com";
    private WebView webView;
    private ProgressDialog dialog;


   Uri uri=Uri.EMPTY.parse(url);
        Intent i=new Intent(Intent.ACTION_VIEW,uri);
        startActivity(i);

我们实现一个请求服务器上的页面操作步骤

 private  void init(){
        webView=(WebView)findViewById(R.id.webview);
        webView.loadUrl(url);//加载页面路径
如果说需要加载后台服务器的路径需要获取(有配置文件)
      Properties properties = readConf.getProperties(getActivity());
      serverUrl = properties.getProperty("serverUrl");
      reRefresh（）
        //覆盖webview默认通过第三方或者浏览器打开第三方的行为，是的网页在webview中打开
       webview.setWebViewClient(webClient); //设置Web视图
        //启用支持javascript
        setUpView()
        //加载页面优先使用加载缓存页面 其次再从网路获取
        settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
      //判断页面加载过程
      setViewProgress() 
    }

--------------------------下面都是封装的方法提供调用------------------------------------------------------
//请求页面路径：
 private void reRefresh() {

        OFZAPLog.info(LOG_TAG, "reRefresh");

        webview.loadUrl(serverUrl + "/mess/message.html");
        //webview.loadUrl("https://www.baidu.com");
        webview.reload();

    }


       WebViewClient webClient = new WebViewClient(){
            @Override
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                //true的时候控制网也在webview中打开，false在第三方浏览器打开
                view.loadUrl(url);
                return true;
            }
            //WebViewClient帮助webview去处理一些页面控制，和请求通知

        @TargetApi(android.os.Build.VERSION_CODES.M)
        @Override
        public void onReceivedHttpError(WebView view, WebResourceRequest request, WebResourceResponse errorResponse) {
            super.onReceivedHttpError(view, request, errorResponse);
            // 这个方法在6.0才出现
            int statusCode = errorResponse.getStatusCode();
            System.out.println("onReceivedHttpError code = " + statusCode);
            if (404 == statusCode || 500 == statusCode) {
                if (isRefresh) {
                    view.loadUrl("file:///android_asset/error.html?info=页面错误，请稍后再试");
                    isRefresh = false;
                } else {
                    webview.reload();
                    isRefresh = true;
                }
            }
        }

        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
            super.onReceivedError(view, errorCode, description, failingUrl);//处理网页加载失败时
            view.setVisibility( View.GONE );
            view.loadUrl("file:///android_asset/error.html?info=网络连接错误，请稍后再试");
        }
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
            }
        });
}


 //判断页面加载过程
  private void setViewProgress() {
        webView.setWebChromeClient(new WebChromeClient(){
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                super.onProgressChanged(view, newProgress);
                //newProgress1--100的整数
                if (newProgress==100){
                    //加载完毕页面  关闭progressDialog
                    closeDialog();

                }else {
                    //网页正在加载  打开progressDialog
                    openDialog(newProgress);
                }
            }
            private void openDialog(int newProgress) {
                if (dialog==null){
                    dialog=new ProgressDialog(WevViewActivity.this);
                    dialog.setTitle("正在加载");
                    dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                    dialog.setProgress(newProgress);
                    dialog.show();
                }else {
                    dialog.setProgress(newProgress);
                }
            }
            private void closeDialog() {
                if (dialog!=null&& dialog.isShowing()){
                    dialog.dismiss();
                    dialog=null;
                }
            }
        });
}



   //启用支持javascript
 @SuppressLint("SetJavaScriptEnabled")
    private void setUpView() {
        //加载需要显示的网页
        WebSettings mWebSettings = webview.getSettings();
        mWebSettings.setJavaScriptEnabled(true);  //允许加载javascript
        mWebSettings.setDomStorageEnabled(true);

        webview.setWebViewClient(webClient); //设置Web视图
    }

  @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode==KeyEvent.KEYCODE_BACK){
            //Toast.makeText(this,webView.getUrl(),Toast.LENGTH_SHORT).show();
            if(webView.canGoBack()){
                webView.goBack();//返回上一页
                return true;
            }
            else {
//                退出
               System.exit(0);
            }

        }
        return super.onKeyDown(keyCode, event);
    }

webView
image.png