PhoneGap的/科尔多瓦应用打破了果冻豆 - 访问控制 - 允许 - 起源和setAllowUniversalAccessFromFileURLs [英] Phonegap/Cordova App breaks in Jelly Bean - Access-Control-Allow-Origin and setAllowUniversalAccessFromFileURLs

问题描述

我一直在开发*与科尔多瓦（又名PhoneGap的）为Android远远超过一年了，我试图让我的应用程序可在果冻豆运行，但我收到以下错误：

I've been developing* with Cordova (aka Phonegap) for Android for well over a year now and am trying to make my apps available to run in Jelly Bean, but I am getting the following error:

XMLHttpRequest cannot load http://127.0.0.1:40582/[somerandomstring]. Origin null is not allowed by Access-Control-Allow-Origin. at null:1

（以及类似的错误任何后续AJAX请求使用本地主机或文件：//） 只是为了测试，我承认获得的一切在config.xml中的部分访问控制 - 允许 - 原产地

(and similar errors for any subsequent ajax requesting use of localhost or file://) Just to test, I grant access to everything in the config.xml in the section for Access-Control-Allow-Origin

<access origin="*"/>
<access origin="http://127.0.0.1*"/>

在我的<一个href="http://mail-archives.apache.org/mod_mbox/incubator-callback-dev/201207.mbox/%3C1268020324.77523.1342724256053.JavaMail.jiratomcat@issues-vm%3E"相对=nofollow>研究我已经发现的错误与，谷歌作出的Andr​​oid果冻豆的设置改变。以下是我发现： 从：<一href="https://git-wip-us.apache.org/repos/asf?p=incubator-cordova-android.git;a=commitdiff;h=07439ff9" rel="nofollow">https://git-wip-us.apache.org/repos/asf?p=incubator-cordova-android.git;a=commitdiff;h=07439ff9

In my research I have discovered the error is related to a setting change that Google made as of Android Jelly Bean. Here is what I found: From: https://git-wip-us.apache.org/repos/asf?p=incubator-cordova-android.git;a=commitdiff;h=07439ff9

- 这是从org.apache.cordova.CordovaWebView

-- This is from org.apache.cordova.CordovaWebView

// Jellybean rightfully tried to lock this down. Too bad they didn't give us a whitelist
// while we do this
if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)
    Level16Apis.enableUniversalAccess(settings);

- 这也是从org.apache.cordova.CordovaWebView

-- This is also from org.apache.cordova.CordovaWebView

// Wrapping these functions in their own class prevents warnings in adb like:
// VFY: unable to resolve virtual method 285: Landroid/webkit/WebSettings;.setAllowUniversalAccessFromFileURLs
@TargetApi(16)
private static class Level16Apis {
    static void enableUniversalAccess(WebSettings settings) {
         settings.setAllowUniversalAccessFromFileURLs(true);
     }
}

这是很好的科尔多瓦试图解决的改变，但不幸的是，这并不工作...

It's nice that Cordova tried to work around the change, but unfortunately this does not work...

在这些所谓的线程 href="http://stackoverflow.com/a/11511062/1013526">和的此处我发现了一个通用的解决方案，简单地更改设置如下：

In these SO threads here and here I found a common solution, to simply change a setting as follows:

if(android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
    super.appView.getSettings().setAllowUniversalAccessFromFileURLs(true);    
}

现在，我得到以下警告：

Now I get the following warning:

Call requires API level 16 (current min is 8) 
android.webkit.WebSettings#setAllowUniversalAccessFromFileURLs

下面是我在我的Andr​​oidManifest.xml中的API

Here is what I have for the api in my AndroidManifest.xml

<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" />

为什么需要我去的minSdkVersion更改为16，而不是按照我的targetSdkVersion这是16？

Why is it requiring me to change the minSdkVersion to 16 rather than follow my targetSdkVersion which is 16?

思考？

备注：我目前使用的科尔多瓦2.0，Eclipse的靛蓝SR2（所有更新电流），Android的SDK（所有更新电流），在Windows 7家庭（所有更新电流），Java 7的更新7。

Notes: I'm currently using Cordova 2.0, Eclipse Indigo SR2 (all updates current), Android SDK (all updates current), on Windows 7 Home (all updates current), Java 7 Update 7.

推荐答案

行，所以一吨搜索，猜测和检查后，我找到了一个可行的解决方案。

OK so after a ton of searching, guessing, and checking, I found a workable solution.

我要创建一个单独的功能，为setAllowUniversalAccessFromFileURLs打电话......那固定的TargetApi问题，但随后presented一个不同的软糖它不会连接到我在我的使用loadURL调用，所以我的文件不得不重写onReceivedError功能。这是我得到的code：

I had to create a separate function for the setAllowUniversalAccessFromFileURLs call... That fixed the TargetApi issue but then presented a different one on JellyBean where it wouldn't connect to the file I had in my loadURL call so I had to override the onReceivedError function. Here is my resulting code:

package com.MyUniqueDomain.MyUniquePackage;

import android.annotation.TargetApi;
import android.os.Bundle;
import org.apache.cordova.*;

public class MainActivity extends DroidGap {

    private int retryCount = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        super.setStringProperty("loadingDialog", "Please wait -- loading...");
        super.init();
        if(android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
            fixJellyBeanIssues();
        }
        super.loadUrl("file:///android_asset/www/index.html");
    }

    @TargetApi(16)
    protected void fixJellyBeanIssues() {
        System.out.println(super.appView.toString());
        try {
            super.appView.getSettings().setAllowUniversalAccessFromFileURLs(true);
        } catch(NullPointerException e) {
            System.out.println(e.toString());
        }
    }

    // catch an error and if try again 1x or quit
    @Override
    public void onReceivedError( int errorCode, String description, String failingUrl)
    {
        if(retryCount < 3) {
            retryCount++;
            System.out.println("Connection failed, trying again. Retry Count: "+retryCount);
            super.loadUrl("file:///android_asset/www/index.html");
        } else {
            System.out.println("Sorry, it failed three times so I give up.");
            super.loadUrl("file:///android_asset/www/fail.html");
        }
        return;
    }
}

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