Android 关于WebView全方面的使用（项目应用篇）

webView.setWebViewClient(new MyWebViewClient(this));

/** 
* 监听网页链接:
* - 优酷视频直接跳到自带浏览器 
* - 根据标识:打电话、发短信、发邮件 
* - 进度条的显示 
* - 加载完成后，添加javascript监听 
*/
public class MyWebViewClient extends WebViewClient {

    private IWebPageView iWebPageView;
    private WebViewActivity activity;

    public MyWebViewClient(IWebPageView iWebPageView) {
        this.iWebPageView = iWebPageView;
        activity = (WebViewActivity) iWebPageView;

    }

    @SuppressWarnings("deprecation")
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        // 优酷视频跳转浏览器播放
        if (url.startsWith("http://v.youku.com/")) {
            Intent intent = new Intent();
            intent.setAction("android.intent.action.VIEW");
            intent.addCategory("android.intent.category.DEFAULT");
            intent.addCategory("android.intent.category.BROWSABLE");
            Uri content_url = Uri.parse(url);
            intent.setData(content_url);
            activity.startActivity(intent);
            return true;

            // 电话、短信、邮箱
        } else if (url.startsWith(WebView.SCHEME_TEL) || url.startsWith("sms:") || url.startsWith(WebView.SCHEME_MAILTO)) {
            try {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse(url));
                activity.startActivity(intent);
            } catch (ActivityNotFoundException ignored) {
            }
            return true;
        }
        iWebPageView.startProgress();
        view.loadUrl(url);
        return false;
    }


    @Override
    public void onPageFinished(WebView view, String url) {
        if (activity.progress90) {
            iWebPageView.hindProgressBar();
        } else {
            activity.pageFinish = true;
        }
        if (!CheckNetwork.isNetworkConnected(activity)) {
            iWebPageView.hindProgressBar();
        }
        // html加载完成之后，添加监听图片的点击js函数
        iWebPageView.addImageClickListener();
        super.onPageFinished(view, url);
    }

    // 视频全屏播放按返回页面被放大的问题
    @Override
    public void onScaleChanged(WebView view, float oldScale, float newScale) {
        super.onScaleChanged(view, oldScale, newScale);
        if(newScale - oldScale > 7) {
            view.setInitialScale((int)(oldScale / newScale * 100)); //异常放大，缩回去。
        }
    }
}

public class ImageClickInterface {
    private Context context;

    public ImageClickInterface(Context context) {
        this.context = context;
    }

    @JavascriptInterface
    public void imageClick(String imgUrl, String hasLink) {
        Toast.makeText(context, "----点击了图片", Toast.LENGTH_SHORT).show();
        // 查看大图
//        Intent intent = new Intent(context, ViewBigImageActivity.class);
//        intent.putStringArrayListExtra("imgUrl",imgUrl);
//        context.startActivity(intent);
//        Log.e("----点击了图片 url: ", "" + imgUrl);
    }
}

public void addImageClickListener() {
        // 这段js函数的功能就是，遍历所有的img节点，
       // 并添加onclick函数，函数的功能是在图片点击的时候调用本地java接口并传递对应src和has_link里的值过去
        webView.loadUrl("javascript:(function(){" +
                "var objs = document.getElementsByTagName(\"img\");" +
                "for(var i=0;i<objs.length;i++)" +
                "{" +
                "objs[i].onclick=function(){window.injectedObject.imageClick(this.getAttribute(\"src\"),this.getAttribute(\"has_link\"));}" +
                "}" +
                "})()");
    }

<img src="[./callsms_files/753b877c-c098-43e9-85cc-6df5bbdaaafe](./callsms_files/753b877c-c098-43e9-85cc-6df5bbdaaafe)" style="width: 100%">

<img src='[http://7xk154.com1.z0.glb.clouddn.com/article/753b877c-c098-43e9-85cc-6df5bbdaaafe](http://7xk154.com1.z0.glb.clouddn.com/article/753b877c-c098-43e9-85cc-6df5bbdaaafe)' style='width: 100%'>

/** 设置字体默认缩放大小(改变网页字体大小,setTextSize  api14被弃用)*/
ws.setTextZoom(100);

@Overridepublic 
boolean onKeyDown(int keyCode, KeyEvent event) {    
  if (keyCode == KeyEvent.KEYCODE_BACK) {        
      //全屏播放退出全屏        
      if (webChromeClient.inCustomView()) {            
              hideCustomView();            
              return true;            
        //返回网页上一页        
        } else if (webView.canGoBack()) {            
              webView.goBack();            
              return true;            
         //退出网页        
         } else {            
              webView.loadUrl("about:blank");            
              finish();        
        }    
     }    
    return false;
}

// 进度条 假装加载到90%
public void startProgress90() {
        for (int i = 0; i < 900; i++) {
            final int progress = i + 1;
            mProgressBar.postDelayed(new Runnable() {
                @Override
                public void run() {
                    mProgressBar.setProgress(progress);
                    if (progress == 900) {
                        progress90 = true;
                        if (pageFinish) {
                            startProgress90to100();
                        }
                    }
                }
            }, (i + 1) * 2);
        }
    }

// 加载到90%后再加载到100%
public void progressChanged(int newProgress) {
        if (progress90) {
            int progress = newProgress * 100;
            if (progress > 900) {
                mProgressBar.setProgress(progress);
                if (progress == 1000) {
                    mProgressBar.setVisibility(View.GONE);
                }
            }
        }
    }