android-webview - Android Webview 以编程方式设置代理 Kitkat

Question

我们如何在最新的 Kitkat 版本中以编程方式在 Android webview 中设置代理？

这个 SO 链接WebView android 代理讨论了最高 SDK 版本 18 的版本。但是这些解决方案不再适用于 Kitkat，因为底层 webkit 实现已更改并且它现在使用铬。

Answer 1

这是我的解决方案：

public static void setKitKatWebViewProxy(Context appContext, String host, int port) {
    System.setProperty("http.proxyHost", host);
    System.setProperty("http.proxyPort", port + "");
    System.setProperty("https.proxyHost", host);
    System.setProperty("https.proxyPort", port + "");
    try {
        Class applictionCls = Class.forName("android.app.Application");
        Field loadedApkField = applictionCls.getDeclaredField("mLoadedApk");
        loadedApkField.setAccessible(true);
        Object loadedApk = loadedApkField.get(appContext);
        Class loadedApkCls = Class.forName("android.app.LoadedApk");
        Field receiversField = loadedApkCls.getDeclaredField("mReceivers");
        receiversField.setAccessible(true);
        ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk);
        for (Object receiverMap : receivers.values()) {
            for (Object rec : ((ArrayMap) receiverMap).keySet()) {
                Class clazz = rec.getClass();
                if (clazz.getName().contains("ProxyChangeListener")) {
                    Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class, Intent.class);
                    Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION);

                    /*********** optional, may be need in future *************/
                    final String CLASS_NAME = "android.net.ProxyProperties";
                    Class cls = Class.forName(CLASS_NAME);
                    Constructor constructor = cls.getConstructor(String.class, Integer.TYPE, String.class);
                    constructor.setAccessible(true);
                    Object proxyProperties = constructor.newInstance(host, port, null);
                    intent.putExtra("proxy", (Parcelable) proxyProperties);
                    /*********** optional, may be need in future *************/

                    onReceiveMethod.invoke(rec, appContext, intent);
                }
            }
        }
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (InstantiationException e) {
        e.printStackTrace();
    }
}

我希望它可以帮助你。

注意： Context 参数应该是一个应用程序上下文，如参数名称所示，您可以使用自己实现的应用程序实例来扩展应用程序。

Answer 2

我对@xjy2061 的回答做了一些修改。

变化是：

1. getDeclaredField 到 getField --> 如果您声明了自己的应用程序类，则使用它。否则它不会找到它。

另外，请记住将“com.your.application”更改为您自己的应用程序的类规范名称。

private static boolean setKitKatWebViewProxy(WebView webView, String host, int port) {
    Context appContext = webView.getContext().getApplicationContext();
    System.setProperty("http.proxyHost", host);
    System.setProperty("http.proxyPort", port + "");
    System.setProperty("https.proxyHost", host);
    System.setProperty("https.proxyPort", port + "");
    try {
        Class applictionCls = Class.forName("acr.browser.barebones.Jerky");
        Field loadedApkField = applictionCls.getField("mLoadedApk");
        loadedApkField.setAccessible(true);
        Object loadedApk = loadedApkField.get(appContext);
        Class loadedApkCls = Class.forName("android.app.LoadedApk");
        Field receiversField = loadedApkCls.getDeclaredField("mReceivers");
        receiversField.setAccessible(true);
        ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk);
        for (Object receiverMap : receivers.values()) {
            for (Object rec : ((ArrayMap) receiverMap).keySet()) {
                Class clazz = rec.getClass();
                if (clazz.getName().contains("ProxyChangeListener")) {
                    Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class, Intent.class);
                    Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION);

                    /*********** optional, may be need in future *************/
                    final String CLASS_NAME = "android.net.ProxyProperties";
                    Class cls = Class.forName(CLASS_NAME);
                    Constructor constructor = cls.getConstructor(String.class, Integer.TYPE, String.class);
                    constructor.setAccessible(true);
                    Object proxyProperties = constructor.newInstance(host, port, null);
                    intent.putExtra("proxy", (Parcelable) proxyProperties);
                    /*********** optional, may be need in future *************/

                    onReceiveMethod.invoke(rec, appContext, intent);
                }
            }
        }
        return true;
    } catch (ClassNotFoundException e) {
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw));
        String exceptionAsString = sw.toString();
        Log.v(LOG_TAG, e.getMessage());
        Log.v(LOG_TAG, exceptionAsString);
    } catch (NoSuchFieldException e) {
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw));
        String exceptionAsString = sw.toString();
        Log.v(LOG_TAG, e.getMessage());
        Log.v(LOG_TAG, exceptionAsString);
    } catch (IllegalAccessException e) {
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw));
        String exceptionAsString = sw.toString();
        Log.v(LOG_TAG, e.getMessage());
        Log.v(LOG_TAG, exceptionAsString);
    } catch (IllegalArgumentException e) {
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw));
        String exceptionAsString = sw.toString();
        Log.v(LOG_TAG, e.getMessage());
        Log.v(LOG_TAG, exceptionAsString);
    } catch (NoSuchMethodException e) {
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw));
        String exceptionAsString = sw.toString();
        Log.v(LOG_TAG, e.getMessage());
        Log.v(LOG_TAG, exceptionAsString);
    } catch (InvocationTargetException e) {
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw));
        String exceptionAsString = sw.toString();
        Log.v(LOG_TAG, e.getMessage());
        Log.v(LOG_TAG, exceptionAsString);
    } catch (InstantiationException e) {
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw));
        String exceptionAsString = sw.toString();
        Log.v(LOG_TAG, e.getMessage());
        Log.v(LOG_TAG, exceptionAsString);
    }
    return false;
}

Answer 3

我正在创建一个 cordova android 应用程序，但无法弄清楚为什么对我公司网络上的内部主机的 ajax 请求在 KitKat 上失败。所有本机 Web 请求都成功了，并且 4.4 以下的 android 版本上的所有 ajax 请求也成功了。ajax 请求仅在内部公司 wifi 上失败，这更加令人困惑。

结果发现 KitKat 使用了一个新的 chrome webview，它与以前的 android 版本中使用的标准 webview 不同。kitkat 使用的 chromium 版本存在一个错误，它不尊重代理排除列表。我们公司wifi设置了代理服务器，并且排除了所有内部主机。ajax 请求最终失败，因为对代理的身份验证失败。由于这些请求是针对内部主机的，因此它本来就不应该通过代理。我能够调整 xjy2061 的答案以适合我的用例。

希望这对将来的某人有所帮助，并为他们节省几天的头撞。

//Set KitKat proxy w/ proxy exclusion.    
@TargetApi(Build.VERSION_CODES.KITKAT)
public static void setKitKatWebViewProxy(Context appContext, String host, int port, String exclusionList) {

    Properties properties = System.getProperties();
    properties.setProperty("http.proxyHost", host);
    properties.setProperty("http.proxyPort", port + "");
    properties.setProperty("https.proxyHost", host);
    properties.setProperty("https.proxyPort", port + "");
    properties.setProperty("http.nonProxyHosts", exclusionList);
    properties.setProperty("https.nonProxyHosts", exclusionList);

    try {
        Class applictionCls = Class.forName("android.app.Application");
        Field loadedApkField = applictionCls.getDeclaredField("mLoadedApk");
        loadedApkField.setAccessible(true);
        Object loadedApk = loadedApkField.get(appContext);
        Class loadedApkCls = Class.forName("android.app.LoadedApk");
        Field receiversField = loadedApkCls.getDeclaredField("mReceivers");
        receiversField.setAccessible(true);
        ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk);
        for (Object receiverMap : receivers.values()) {
            for (Object rec : ((ArrayMap) receiverMap).keySet()) {
                Class clazz = rec.getClass();
                if (clazz.getName().contains("ProxyChangeListener")) {
                    Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class, Intent.class);
                    Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION);

                    /*********** optional, may be need in future *************/
                    final String CLASS_NAME = "android.net.ProxyProperties";
                    Class cls = Class.forName(CLASS_NAME);
                    Constructor constructor = cls.getConstructor(String.class, Integer.TYPE, String.class);
                    constructor.setAccessible(true);
                    Object proxyProperties = constructor.newInstance(host, port, exclusionList);
                    intent.putExtra("proxy", (Parcelable) proxyProperties);
                    /*********** optional, may be need in future *************/

                    onReceiveMethod.invoke(rec, appContext, intent);
                }
            }
        }
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (InstantiationException e) {
        e.printStackTrace();
    }
}

您可以按如下方式调用上述方法：

首先在文件顶部导入这个库。

import android.util.ArrayMap;

然后调用方法

int currentapiVersion = android.os.Build.VERSION.SDK_INT;
//check first to see if we are running KitKat
if (currentapiVersion >= Build.VERSION_CODES.KITKAT){
    setKitKatWebViewProxy(context, proxy, port, exclusionList);
}

Answer 4

https://android.googlesource.com/platform/external/chromium/+/android-4.4_r1/net/proxy/proxy_config_service_android.cc

Has methods to set the proxy. I am still trying to figure out how to invoke this from Java code. Pointers?

Answer 5

https://codereview.chromium.org/26763005

从这个补丁中猜测，您也许可以在不久的将来再次设置代理。

Answer 6

在设置代理配置后立即从 onCreate 加载页面时，在某些设备上提供的解决方案存在一些问题。在一些小的延迟后打开网页解决了这个问题。似乎代理配置需要一些时间才能生效。