Question

我正在将资源中的HTML文件加载到webview中。

html包含指向其他html资源文件的链接。单击链接可在SDK＆lt; 24但在单击Nougat（SDK 24）设备上第二个html页面的链接时会产生FileUriExposedException错误。

将资产中的html加载到webview中的代码：

wbHelp.loadDataWithBaseURL("file:///android_asset/", readAssetFileAsString("Index.html"), "text/html", "UTF-8", null);

和readAssetFileAsString是：

private String readAssetFileAsString(String sourceHtmlLocation)
{
    InputStream is;
    try
    {
        is = getContext().getAssets().open(sourceHtmlLocation);
        int size = is.available();

        byte[] buffer = new byte[size];
        is.read(buffer);
        is.close();

        return new String(buffer, "UTF-8");
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }

    return "";
}

HTML可以是非常基本的。的index.html

<html><a href="Page2.html">Page 2</a></html>

Page2.html

<html><h1>Page 2</h1>

完整的错误日志是：

11-12 17:58:03.694 5831-5831/appname W/System.err: android.os.FileUriExposedException: file:///android_asset/Page2.html exposed beyond app through Intent.getData()
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.os.StrictMode.onFileUriExposed(StrictMode.java:1799)
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.net.Uri.checkFileUriExposed(Uri.java:2346)
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.content.Intent.prepareToLeaveProcess(Intent.java:8933)
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.content.Intent.prepareToLeaveProcess(Intent.java:8894)
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1517)
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.app.Activity.startActivityForResult(Activity.java:4224)
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:48)
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:77)
11-12 17:58:03.694 5831-5831/appname W/System.err:     at android.app.Activity.startActivityForResult(Activity.java:4183)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at android.app.Activity.startActivity(Activity.java:4507)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at android.app.Activity.startActivity(Activity.java:4475)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at android.content.ContextWrapper.startActivity(ContextWrapper.java:356)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at org.chromium.android_webview.ResourcesContextWrapperFactory$WebViewContextWrapper.startActivity(ResourcesContextWrapperFactory.java:121)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at org.chromium.android_webview.AwContentsClient.sendBrowsingIntent(AwContentsClient.java:203)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at org.chromium.android_webview.AwContentsClient.shouldIgnoreNavigation(AwContentsClient.java:170)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at org.chromium.android_webview.AwContentsClientBridge.shouldOverrideUrlLoading(AwContentsClientBridge.java:256)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:39)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:102)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at android.os.Looper.loop(Looper.java:154)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6077)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
11-12 17:58:03.695 5831-5831/appname W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
11-12 17:58:03.699 5831-5831/appname A/chromium: [FATAL:jni_android.cc(236)] Please include Java exception stack in crash report
                                                    
                                                    
                                                    --------- beginning of crash
11-12 17:58:03.856 5831-5831/appname W/google-breakpad: ### ### ### ### ### ### ### ### ### ### ### ### ###
11-12 17:58:03.856 5831-5831/appname W/google-breakpad: Chrome build fingerprint:
11-12 17:58:03.856 5831-5831/appname W/google-breakpad: 1.0
11-12 17:58:03.856 5831-5831/appname W/google-breakpad: 72
11-12 17:58:03.856 5831-5831/appname W/google-breakpad: ### ### ### ### ### ### ### ### ### ### ### ### ###
11-12 17:58:03.857 5831-5831/appname A/libc: Fatal signal 6 (SIGABRT), code -6 in tid 5831 (appname)
                                                
                                                [ 11-12 17:58:03.857   270:  270 W/         ]
                                                debuggerd: handling request: pid=5831 uid=10379 gid=10379 tid=5831

我尝试过使用某种形式的提供程序（例如在这个答案：android.os.FileUriExposedException: file:///storage/emulated/0/test.txt exposed beyond app through Intent.getData()中），但它没有任何效果。

Answer 1

我能够使用@OmonsWare here建议的shouldOverrideUrlLoading来克服异常：

在运行Nougat的模拟器上测试：

    web.setWebViewClient(new WebViewClient()
    {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url)
        {
            Log.i("WebView", "Attempting to load URL: " + url);

            view.loadUrl(url);
            return true;
        }
    });

Answer 2

此外，您可以在应用程序或活动的onCreate方法中添加此代码：

   StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
   StrictMode.setVmPolicy(builder.build());

此行会使您的应用忽略该异常。

阅读文档后，您会发现只使用此代码：

    WebViewClient client = new WebViewClient() {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            return false;
        }
    };

    webView.setWebViewClient(client);

也会有效，因为返回false你要求你的webView来处理这个操作。 https://developer.android.com/reference/android/webkit/WebViewClient.html#shouldOverrideUrlLoading(android.webkit.WebView，java.lang.String）

在Nougat上的webview中浏览基于资产的html文件

2 个答案: