android Webview读取网页里的所有图片

Posted 2022-11-26 mo_weifeng

                <WebView
                    android:id="@+id/webview"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    />

初始化，这里读的是文本

  @SuppressLint("javascriptInterface")
    private void initWebView(String html) 
        // 启用javascript
        contentWebView.getSettings().setJavaScriptEnabled(true);
        contentWebView.getSettings().setDefaultTextEncodingName("UTF-8");
//        // 随便找了个带图片的网站
//        contentWebView.loadUrl("https://www.pmcaff.com/discuss/3394893931276352?newwindow=1");
        contentWebView.loadDataWithBaseURL(null, html, "text/html", "utf-8", null);//加载html数据

        // 添加js交互接口类，并起别名 imagelistner
//        contentWebView.addJavascriptInterface(new JavascriptInterface(this), "imagelistner");

        contentWebView.addJavascriptInterface(new JavascriptInterface2(this), "imageListener");

        contentWebView.setWebViewClient(new MyWebViewClient());

    

// 监听
    private class MyWebViewClient extends WebViewClient 
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) 

            return super.shouldOverrideUrlLoading(view, url);
        

        @Override
        public void onPageFinished(WebView view, String url) 

            view.getSettings().setJavaScriptEnabled(true);
            addImageClickListner2();
            super.onPageFinished(view, url);
            // html加载完成之后，添加监听图片的点击js函数
//            addImageClickListner();


        

        @Override
        public void onPageStarted(WebView view, String url, Bitmap favicon) 
            view.getSettings().setJavaScriptEnabled(true);

            super.onPageStarted(view, url, favicon);
        

        @Override
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) 

            super.onReceivedError(view, errorCode, description, failingUrl);

        
    

// 注入js函数监听
    private void addImageClickListner2() 
        //网页加载完成 走JS代码
        contentWebView.loadUrl("javascript:(function()" +
                "var objs = document.getElementsByTagName(\\"img\\"); " +
                "var imgUrl = \\"\\";"+
                "var filter = [\\"img//EventHead.png\\",\\"img//kong.png\\",\\"hdtz//button.png\\"];"+
                "var isShow = true;"+
                "for(var i=0;i<objs.length;i++)" +
                "for(var j=0;j<filter.length;j++)"+
                "if(objs[i].src.indexOf(filter[j])>=0) "+
                "isShow = false; break;"+
                "if(isShow && objs[i].width>1)"+
                "imgUrl += objs[i].src + ',';isShow = true;"+
                "    objs[i].οnclick=function()  " +
                "      "
                + "        window.imageListener.openImage(imgUrl,this.src);" +
                "    " +
                "" +
                "" +
                ")()"
        );

    

  // js通信接口
    public class JavascriptInterface2 

        private Context context;

        public JavascriptInterface2(Context context) 
            this.context = context;
        

        @android.webkit.JavascriptInterface
        public void openImage(String imageUrl,String img) 
            int position = 0;
            String[] imgs = imageUrl.split(",");
            ArrayList<String> imgUrlList = new ArrayList<>();
            for (String s : imgs) 
                imgUrlList.add(s);
            
            for (int i = 0;i<imgUrlList.size();i++)
                if (img.equals(imgUrlList.get(i)))
                    position = i;
                
            
            ImageHandlerUtil.browseImages(getContext(), imgUrlList, position);

//            Intent intent = new Intent(MainActivity.this, ImageActivity.class);
//            intent.putExtra("number",position);
//            intent.putExtra("list",(Serializable) imgUrlList);
//            startActivity(intent);