Android WebView代理设置方法（API10~21适用）

最近碰到个需求需要在APP中加入代理，HttpClient的代理好解决，但是WebView碰到些问题，然后找到个API10~API21都通用的类，需要用的同学自己看吧，使用方法，直接调用类方法setProxy即可，applicationName可以设置为null。

 /**
  * Created by shengdong.huang on 2015/9/18.
  */
 public class ProxySettings {

     private static final String LOG_TAG = "halfman";

     private static final String APPLICATION_NAME = "android.app.Application";

     public static boolean setProxy(WebView webview, String host, int port, String applicationName) {

         // 3.2 (HC) or lower
         if (Build.VERSION.SDK_INT <= 13) {
             return setProxyUpToHC(webview, host, port);
         }
         // ICS: 4.0
         else if (Build.VERSION.SDK_INT <= 15) {
             return setProxyICS(webview, host, port);
         }
         // 4.1-4.3 (JB)
         else if (Build.VERSION.SDK_INT <= 18) {
             return setProxyJB(webview, host, port);
         }
         // 4.4 (KK) & 5.0 (Lollipop)
         else {
             return setProxyKKPlus(webview, host, port,
                     applicationName == null ? APPLICATION_NAME : applicationName);
         }
     }

     /**
      * Set Proxy for Android 3.2 and below.
      */
     @SuppressWarnings("all")
     private static boolean setProxyUpToHC(WebView webview, String host, int port) {
         Log.d(LOG_TAG, "Setting proxy with <= 3.2 API.");

         HttpHost proxyServer = new HttpHost(host, port);
         // Getting network
         Class networkClass = null;
         Object network = null;
         try {
             networkClass = Class.forName("android.webkit.Network");
             if (networkClass == null) {
                 Log.e(LOG_TAG, "failed to get class for android.webkit.Network");
                 return false;
             }
             Method getInstanceMethod = networkClass.getMethod("getInstance", Context.class);
             if (getInstanceMethod == null) {
                 Log.e(LOG_TAG, "failed to get getInstance method");
             }
             network = getInstanceMethod.invoke(networkClass, new Object[]{webview.getContext()});
         } catch (Exception ex) {
             Log.e(LOG_TAG, "error getting network: " + ex);
             return false;
         }
         if (network == null) {
             Log.e(LOG_TAG, "error getting network: network is null");
             return false;
         }
         Object requestQueue = null;
         try {
             Field requestQueueField = networkClass
                     .getDeclaredField("mRequestQueue");
             requestQueue = getFieldValueSafely(requestQueueField, network);
         } catch (Exception ex) {
             Log.e(LOG_TAG, "error getting field value");
             return false;
         }
         if (requestQueue == null) {
             Log.e(LOG_TAG, "Request queue is null");
             return false;
         }
         Field proxyHostField = null;
         try {
             Class requestQueueClass = Class.forName("android.net.http.RequestQueue");
             proxyHostField = requestQueueClass
                     .getDeclaredField("mProxyHost");
         } catch (Exception ex) {
             Log.e(LOG_TAG, "error getting proxy host field");
             return false;
         }

         boolean temp = proxyHostField.isAccessible();
         try {
             proxyHostField.setAccessible(true);
             proxyHostField.set(requestQueue, proxyServer);
         } catch (Exception ex) {
             Log.e(LOG_TAG, "error setting proxy host");
         } finally {
             proxyHostField.setAccessible(temp);
         }

         Log.d(LOG_TAG, "Setting proxy with <= 3.2 API successful!");
         return true;
     }

     @SuppressWarnings("all")
     private static boolean setProxyICS(WebView webview, String host, int port) {
         try
         {
             Log.d(LOG_TAG, "Setting proxy with 4.0 API.");

             Class jwcjb = Class.forName("android.webkit.JWebCoreJavaBridge");
             Class params[] = new Class[1];
             params[0] = Class.forName("android.net.ProxyProperties");
             Method updateProxyInstance = jwcjb.getDeclaredMethod("updateProxy", params);

             Class wv = Class.forName("android.webkit.WebView");
             Field mWebViewCoreField = wv.getDeclaredField("mWebViewCore");
             Object mWebViewCoreFieldInstance = getFieldValueSafely(mWebViewCoreField, webview);

             Class wvc = Class.forName("android.webkit.WebViewCore");
             Field mBrowserFrameField = wvc.getDeclaredField("mBrowserFrame");
             Object mBrowserFrame = getFieldValueSafely(mBrowserFrameField, mWebViewCoreFieldInstance);

             Class bf = Class.forName("android.webkit.BrowserFrame");
             Field sJavaBridgeField = bf.getDeclaredField("sJavaBridge");
             Object sJavaBridge = getFieldValueSafely(sJavaBridgeField, mBrowserFrame);

             Class ppclass = Class.forName("android.net.ProxyProperties");
             Class pparams[] = new Class[3];
             pparams[0] = String.class;
             pparams[1] = int.class;
             pparams[2] = String.class;
             Constructor ppcont = ppclass.getConstructor(pparams);

             updateProxyInstance.invoke(sJavaBridge, ppcont.newInstance(host, port, null));

             Log.d(LOG_TAG, "Setting proxy with 4.0 API successful!");
             return true;
         }
         catch (Exception ex)
         {
             Log.e(LOG_TAG, "failed to set HTTP proxy: " + ex);
             return false;
         }
     }

     /**
      * Set Proxy for Android 4.1 - 4.3.
      */
     @SuppressWarnings("all")
     private static boolean setProxyJB(WebView webview, String host, int port) {
         Log.d(LOG_TAG, "Setting proxy with 4.1 - 4.3 API.");

         try {
             Class wvcClass = Class.forName("android.webkit.WebViewClassic");
             Class wvParams[] = new Class[1];
             wvParams[0] = Class.forName("android.webkit.WebView");
             Method fromWebView = wvcClass.getDeclaredMethod("fromWebView", wvParams);
             Object webViewClassic = fromWebView.invoke(null, webview);

             Class wv = Class.forName("android.webkit.WebViewClassic");
             Field mWebViewCoreField = wv.getDeclaredField("mWebViewCore");
             Object mWebViewCoreFieldInstance = getFieldValueSafely(mWebViewCoreField, webViewClassic);

             Class wvc = Class.forName("android.webkit.WebViewCore");
             Field mBrowserFrameField = wvc.getDeclaredField("mBrowserFrame");
             Object mBrowserFrame = getFieldValueSafely(mBrowserFrameField, mWebViewCoreFieldInstance);

             Class bf = Class.forName("android.webkit.BrowserFrame");
             Field sJavaBridgeField = bf.getDeclaredField("sJavaBridge");
             Object sJavaBridge = getFieldValueSafely(sJavaBridgeField, mBrowserFrame);

             Class ppclass = Class.forName("android.net.ProxyProperties");
             Class pparams[] = new Class[3];
             pparams[0] = String.class;
             pparams[1] = int.class;
             pparams[2] = String.class;
             Constructor ppcont = ppclass.getConstructor(pparams);

             Class jwcjb = Class.forName("android.webkit.JWebCoreJavaBridge");
             Class params[] = new Class[1];
             params[0] = Class.forName("android.net.ProxyProperties");
             Method updateProxyInstance = jwcjb.getDeclaredMethod("updateProxy", params);

             updateProxyInstance.invoke(sJavaBridge, ppcont.newInstance(host, port, null));
         } catch (Exception ex) {
             Log.e(LOG_TAG,"Setting proxy with >= 4.1 API failed with error: " + ex.getMessage());
             return false;
         }

         Log.d(LOG_TAG, "Setting proxy with 4.1 - 4.3 API successful!");
         return true;
     }

     @SuppressWarnings("all")
     private static boolean setProxyKKPlus(WebView webView, String host, int port, String applicationClassName) {
         Log.d(LOG_TAG, "Setting proxy with >= 4.4 API.");

         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(applicationClassName);
             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);

                         onReceiveMethod.invoke(rec, appContext, intent);
                     }
                 }
             }

             Log.d(LOG_TAG, "Setting proxy with >= 4.4 API successful!");
             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);
         }
         return false;
     }

     private static Object getFieldValueSafely(Field field, Object classInstance) throws IllegalArgumentException, IllegalAccessException {
         boolean oldAccessibleValue = field.isAccessible();
         field.setAccessible(true);
         Object result = field.get(classInstance);
         field.setAccessible(oldAccessibleValue);
         return result;
     }
 }

就是这些，祝码运昌隆~~