js调试效果：

下面主要是拼装js代码 ：

     /** * @Description 获取webView选中文字内容 * @param webView* @param callBack*/public static void webViewGetSelectedData(WebView webView,webViewGetSelectedDataCallBack callBack) {String js ="function selectEnable(document) {"+ "    document.oncontextmenu = new Function(\"if(event){event.returnValue=true;}\");"+ "    document.onselectstart = new Function(\"if(event){event.returnValue=true;}\");"+ "    let frames = document.getElementsByTagName(\"iframe\");"+ "    if (frames.length > 0) {"+ "        for (var i = 0; i < frames.length; i++) {"+ "            document = frames[i].contentDocument;"+ "            selectEnable(document);"+ "        }"+ "    }"+ "}"+ "function selectTxt(document) {"+ "    let rtnTxt = \"\";"+ "    rtnTxt = document.getSelection ? document.getSelection().toString() : document.selection.createRange().text;"+ "    let frames = document.getElementsByTagName(\"iframe\");"+ "    if (frames.length > 0) {"+ "        for (var i = 0; i < frames.length; i++) {"+ "            document = frames[i].contentDocument;"+ "            let sltTxt = selectTxt(document);"+ "            if (sltTxt != \"\") {"+ "                rtnTxt = sltTxt;"+ "            }"+ "        }"+ "    }"+ "    return rtnTxt;"+ "}"+ "(function(){"+ "    selectEnable(document);"+ "    return selectTxt(document);"+ "})()";/* android系统4.4以上的时候调用 4.4以下忽略*/webView.evaluateJavascript("javascript:" + js, txt -> {//todo 这里可以对返回文本进行处理，比如转为中文字符，过滤非法字符callBack.onFinished(txt);});        }public interface webViewGetSelectedDataCallBack{/**@param value*/void onFinished(String value);}

至于如何调用，可以通过 

@Override
public void onActionModeStarted(ActionMode mode) {……webViewGetSelectedData(webView, value -> {               Log.i("getSelection", "getSelectedData: "+value);});……super.onActionModeStarted(mode);
}