对获取根activity的办法进行修改。

platforms/android/src/org/apache/cordova/x5engine/X5WebViewClient.java

 /*
-       Licensed to the Apache Software Foundation (ASF) under one
-       or more contributor license agreements.  See the NOTICE file
-       distributed with this work for additional information
-       regarding copyright ownership.  The ASF licenses this file
-       to you under the Apache License, Version 2.0 (the
-       "License"); you may not use this file except in compliance
-       with the License.  You may obtain a copy of the License at
-
-         http://www.apache.org/licenses/LICENSE-2.0
-
-       Unless required by applicable law or agreed to in writing,
-       software distributed under the License is distributed on an
-       "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-       KIND, either express or implied.  See the License for the
-       specific language governing permissions and limitations
-       under the License.
+对系统等webview进行设置。。
+
+1、增加了静态js加载mimetype的强制加入。
+2、增加了img svg文件的mimetype的强制加入。（有bug）
+
 */
 package org.apache.cordova.x5engine;
 
@@ -77,7 +66,6 @@ public class X5WebViewClient extends WebViewClient {
     @Override
     public WebResourceResponse shouldInterceptRequest(WebView webView, WebResourceRequest request , Bundle bundle) {
 
-
         String url = request.getUrl().toString();
         if (url.contains(".js")){
             //干掉file：///
@@ -99,7 +87,7 @@ public class X5WebViewClient extends WebViewClient {
             String fileName = rootDir + "/" + newUrl;
 
             try {
-                InputStream is = this.activity.getAssets().open(fileName);
+                InputStream is = parentEngine.cordova.getActivity().getAssets().open(fileName);
                 Log.e("file" , "------ File loaded ---000-0-------------");
                 return new WebResourceResponse(mimeType, encoding, is);
             } catch (IOException e) {