AndroidのソフトウェアProxyChangingの機能。 パート1：ジェリービーンからロリポップまで

• あなたの英語レベルは、少なくとも中級以上でなければなりません。
• 「 コンテキストとは何ですか？」という質問は避けてください。また、この時点で複雑さが似ている場合は、 developer.android.comまたはAlexander Klimovを読むことができます。
• また、アノテーション@Before 、 @Test 、 @Afterなど、テストに関連するものは恥ずべきではありません。 繰り返しますが、リンク： developer.android.com

• 私のコードにはコメントがほとんどありません。 私はこの問題を長い間考え、非常に長い間疑っていましたが、最終的にはjavaをまったく知らない女の子にそれを与えることにしました、私は彼らをほとんど放棄したので、彼らと彼らの方法で何が起こるかを言うことは非常に正確です。
• コメント、追加、質問、コメント（たとえば、前の段落）がある場合-作成者はそれらを待っています。
• 記事は現在非常に一般化されています。作業量に応じていくつかのポイントをより詳細に表示したい場合は、コメントを書くか、興味のあるトピックに関する別の記事を書きます。
• パッケージの名前には謙虚な使用人のニックネームが含まれているため、コードにはインポートがありません。ルールから判断すると、サンドボックスの記事ではそれらを照らすことはできません。

• BaseWifiConfigurationクラスは、実際にはWifiConfigurationオブジェクトを格納し、 Contextを介して作成されたときに最新のネットワーク構成を取得する実装を含んでいます。
• ProxyChangerインターフェイスは、それぞれ、プロキシネットワーク構成を操作するメソッドの可用性を保証します。
• Reflectionを使用する必要があります。このためのメインメソッドは、頻繁に使用されるため、別のクラスに配置することが望ましいです。 したがって、 ReflectionHelperクラスを作成します。

 @RunWith(AndroidJUnit4.class) public class WifiProxyChangerTest { @Rule public ExpectedException expectedException = ExpectedException.none(); @Rule public ActivityTestRule mActivityRule = new ActivityTestRule<>( MainActivity.class); Context context; @Before public void prepare() throws Exception { context = mActivityRule.getActivity(); ExceptionsPreparer.prepareExceptions(expectedException, context); } @Test public void testChangeWifiStaticProxySettings() throws Exception { String testIp = RandomValuesGenerator.randomIp(); int testPort = RandomValuesGenerator.randomPort(); WifiProxyChanger.changeWifiStaticProxySettings(testIp, testPort, context); assertEquals(testIp, WifiProxyInfo.getHost(context)); assertEquals(testPort, WifiProxyInfo.getPort(context)); } @Test public void testProxySettingsClear() throws Exception { String testIp = RandomValuesGenerator.randomIp(); int testPort = RandomValuesGenerator.randomPort(); WifiProxyChanger.changeWifiStaticProxySettings(testIp, testPort, context); WifiProxyChanger.clearProxySettings(context); assertEquals(ProxySettings.NONE, CurrentProxyChangerGetter .chooseProxyChangerForCurrentApi(context) .getProxySettings()); } @After public void learSettings() throws Exception { if (NetworkHelper.isWifiConnected(context) && ApiChecker.isSupportedApi()) WifiProxyChanger.clearProxySettings(context); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 @RunWith(AndroidJUnit4.class) public class WifiProxyInfoTest { @Rule public ExpectedException expectedException = ExpectedException.none(); @Rule public ActivityTestRule mActivityRule = new ActivityTestRule<>( MainActivity.class); Context context; @Before public void prepareAndPresetProxy() throws Exception { context = mActivityRule.getActivity(); ExceptionsPreparer.prepareExceptions(expectedException, context); if (ApiChecker.isSupportedApi()) { WifiProxyChanger.clearProxySettings(context); WifiProxyChanger.changeWifiStaticProxySettings("localhost", 3030, context); } } @Test public void testGetHost() throws Exception { assertEquals("localhost", WifiProxyInfo.getHost(context)); } @Test public void testGetPort() throws Exception { assertEquals(3030, WifiProxyInfo.getPort(context)); } @Test public void testGetProxySettings() throws Exception { assertEquals(ProxySettings.STATIC, WifiProxyInfo.getProxySettings(context)); } @After public void learSettings() throws Exception { if (NetworkHelper.isWifiConnected(context) && ApiChecker.isSupportedApi()) WifiProxyChanger.clearProxySettings(context); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 @RunWith(AndroidJUnit4.class) public class CurrentProxyChangerGetterTest { @Rule public ExpectedException expectedException = ExpectedException.none(); @Rule public ActivityTestRule mActivityRule = new ActivityTestRule<>( MainActivity.class); Context context; @Before public void prepare() throws Exception { context = mActivityRule.getActivity(); ExceptionsPreparer.prepareExceptions(expectedException, context); } @Test public void testChooseProxyChangerForCurrentApi() throws Exception { ProxyChanger proxyChanger = CurrentProxyChangerGetter.chooseProxyChangerForCurrentApi(context); WifiManager manager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); assertEquals(manager.getConnectionInfo().getNetworkId(), proxyChanger.getWifiConfiguration().networkId); if (ApiChecker.isJellyBeanOrKitkat()) { assertTrue(proxyChanger instanceof WifiConfigurationForApiFrom15To19); } else if (ApiChecker.isLolipop()) { assertTrue(proxyChanger instanceof WifiConfigurationForApiFrom21To22); } } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public abstract class ExceptionsPreparer { public static void prepareExceptions(ExpectedException expectedException, Context context) throws Exception { if (!ApiChecker.isSupportedApi()) { expectedException.expect(ApiNotSupportedException.class); } else if (!NetworkHelper.isWifiConnected(context)) { expectedException.expect(NullWifiConfigurationException.class); } else if (!CurrentProxyChangerGetter.chooseProxyChangerForCurrentApi(context).isProxySetted()) { expectedException.expect(WifiProxyNotSettedException.class); } } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

リフレクションは、Java仮想マシンで実行されているアプリケーションの実行時の動作を検査または変更する機能を必要とするプログラムで一般的に使用されます。

Oracle Java Turtorial

小さな例

小さなライブラリがあり、Webページを取得して保存するためのクラスがいくつかあるとします。 その場で接続して使用したいです。 これのために小さなクラスを書きましょう：

 public class LibLoader { //      ,   2   . URLClassLoader urlClassLoader; String page; LibLoader(File myJar) throws MalformedURLException { urlClassLoader = new URLClassLoader(new URL[]{myJar.toURL()}, this.getClass().getClassLoader()); } public void loadPage(URL url) throws Exception { Class classToLoad = Class.forName("com.company.HtmlPageGetter", true, urlClassLoader); Method method = classToLoad.getDeclaredMethod("getPageFromURL", URL.class); Object instance = classToLoad.newInstance(); Object result = method.invoke(instance, url); page = (String) result; } public String getCurrentPage() { return page; } public void saveCurrentPage(String name) throws Exception { List<String> content = new ArrayList<>(); content.add(page); Class classToLoad = Class.forName("com.company.HtmlPageSaver", true, urlClassLoader); Method method = classToLoad.getDeclaredMethod("savePageToFile", String.class, List.class); Object instance = classToLoad.newInstance(); method.invoke(instance, name, content); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

今それを使用します：

  public static void main(String[] args) throws Exception { File lib = new File("htmlgetandsave.jar"); LibLoader libLoader = new LibLoader(lib); libLoader.loadPage(new URL("https://habrahabr.ru/post/69552/")); System.out.println(libLoader.getCurrentPage()); libLoader.saveCurrentPage("   -  reflection     "); }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

結果を公開してお楽しみください：







さらに、ライブラリファイルの場所のみを知ることができ、その構造については何も知りません。Reflectionapiを使用すると、実行時にこの問題を直接調査し、その後使用できます。

 public abstract class ReflectionHelper { /** * Used for getting public fields with @hide annotation */ public static Object getField(Object object, String name) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException { Field field = object.getClass().getField(name); return field.get(object); } /** * Used for getting private fields */ public static Object getDeclaredField(Object object, String name) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException { Field declaredField = object.getClass().getDeclaredField(name); declaredField.setAccessible(true); return declaredField.get(object); } /** * Used for setting private fields */ public static void setDeclaredField(Object object, String name, Object value) throws NoSuchFieldException, IllegalAccessException { Field declaredField = object.getClass().getDeclaredField(name); declaredField.setAccessible(true); declaredField.set(object, value); } /** * Used for setting Enum fields */ public static void setEnumField(Object object, String value, String name) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException { Field field = object.getClass().getField(name); field.set(object, Enum.valueOf((Class<Enum>) field.getType(), value)); } /** * Used for simplifying process of invoking private method * Automatically detects args types and founds method to get and invoke */ public static Object getMethodAndInvokeIt(Object object, String methodName, Object... args) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException { Method method = object.getClass().getDeclaredMethod(methodName, parameterTypes(args)); method.setAccessible(true); return method.invoke(object, args); } private static Class[] parameterTypes(Object... args) { ArrayList<Class> classes = new ArrayList<>(); for (Object arg : args) { classes.add(arg.getClass()); } return classes.toArray(new Class[args.length]); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public class BaseWifiConfiguration { protected WifiConfiguration wifiConfiguration; protected BaseWifiConfiguration(WifiConfiguration wifiConfiguration) throws NullWifiConfigurationException { if (wifiConfiguration == null) throw new NullWifiConfigurationException(); this.wifiConfiguration = wifiConfiguration; } protected BaseWifiConfiguration(Context context) throws NullWifiConfigurationException { this(getCurrentWifiConfigurationFromContext(context)); } public WifiConfiguration getWifiConfiguration() { return wifiConfiguration; } private static WifiConfiguration getCurrentWifiConfigurationFromContext(Context context) { final WifiManager manager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); List<WifiConfiguration> wifiConfigurationList = manager.getConfiguredNetworks(); if (!manager.isWifiEnabled() || wifiConfigurationList == null || wifiConfigurationList.isEmpty()) return null; return findWifiConfigurationByNetworkId(wifiConfigurationList, manager.getConnectionInfo().getNetworkId()); } private static WifiConfiguration findWifiConfigurationByNetworkId(List<WifiConfiguration> wifiConfigurationList, int networkId) { for (WifiConfiguration wifiConf : wifiConfigurationList) { if (wifiConf.networkId == networkId) return wifiConf; } return null; } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public interface ProxyChanger { void setProxySettings(ProxySettings proxySettings) throws NoSuchFieldException, IllegalAccessException; ProxySettings getProxySettings() throws NoSuchFieldException, IllegalAccessException; void setProxyHostAndPort(String host, int port) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, NoSuchFieldException; String getProxyHost() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ApiNotSupportedException, NoSuchFieldException; int getProxyPort() throws ApiNotSupportedException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, NoSuchFieldException; boolean isProxySetted() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ApiNotSupportedException, NoSuchFieldException; WifiConfiguration getWifiConfiguration(); }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public enum ProxySettings { /* No proxy is to be used. Any existing proxy settings * should be cleared. */ NONE("NONE"), /* Use statically configured proxy. Configuration can be accessed * with httpProxy. */ STATIC("STATIC"), /* no proxy details are assigned, this is used to indicate * that any existing proxy settings should be retained */ UNASSIGNED("UNASSIGNED"), /* Use a Pac based proxy. */ PAC("PAC"); String value = ""; ProxySettings(String value) { this.value = value; } public String getValue() { return value; } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public abstract class ProxyPropertiesConstructor { public static Object proxyProperties(String host, int port) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException { return proxyProperties(host, port, null); } public static Object proxyProperties(String host, int port, String exclList) throws NoSuchMethodException, ClassNotFoundException, IllegalAccessException, InvocationTargetException, InstantiationException { return proxyPropertiesConstructor().newInstance(host, port, exclList); } private static Constructor proxyPropertiesConstructor() throws ClassNotFoundException, NoSuchMethodException { return Class.forName("android.net.ProxyProperties").getConstructor(String.class, int.class, String.class); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public class ProxyPropertiesContainer { Object proxyProperties; ProxyPropertiesContainer(Object proxyProperties) { this.proxyProperties = proxyProperties; } ProxyPropertiesContainer(String host, int port) throws ClassNotFoundException, NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException { this(host, port, null); } ProxyPropertiesContainer(String host, int port, String exclList) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException { this(ProxyPropertiesConstructor.proxyProperties(host, port, exclList)); } public String getHost() throws NoSuchFieldException, IllegalAccessException { return (String) ReflectionHelper.getDeclaredField(proxyProperties, "mHost"); } public int getPort() throws NoSuchFieldException, IllegalAccessException { return (int) ReflectionHelper.getDeclaredField(proxyProperties, "mPort"); } public String getExclusionList() throws NoSuchFieldException, IllegalAccessException { return (String) ReflectionHelper.getDeclaredField(proxyProperties, "mExclusionList"); } public Object getProxyProperties() { return proxyProperties; } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public class WifiConfigurationForApiFrom15To19 extends BaseWifiConfiguration implements ProxyChanger { private ProxyPropertiesContainer proxyPropertiesContainer; public WifiConfigurationForApiFrom15To19(Context context) throws NoSuchFieldException, IllegalAccessException, NullWifiConfigurationException { super(context); this.proxyPropertiesContainer = new ProxyPropertiesContainer(getCurrentProxyProperties()); } public static WifiConfigurationForApiFrom15To19 createFromCurrentContext(Context context) throws NoSuchFieldException, IllegalAccessException, NullWifiConfigurationException { return new WifiConfigurationForApiFrom15To19(context); } @Override public void setProxySettings(ProxySettings proxySettings) throws NoSuchFieldException, IllegalAccessException { ReflectionHelper.setEnumField(wifiConfiguration, proxySettings.getValue(), "proxySettings"); } @Override public ProxySettings getProxySettings() throws NoSuchFieldException, IllegalAccessException { return ProxySettings.valueOf(String.valueOf(ReflectionHelper.getDeclaredField(wifiConfiguration, "proxySettings"))); } @Override public void setProxyHostAndPort(String host, int port) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, NoSuchFieldException { proxyPropertiesContainer = new ProxyPropertiesContainer(host, port); ReflectionHelper.getMethodAndInvokeIt( getLinkProperties(), "setHttpProxy", proxyPropertiesContainer.getProxyProperties()); } @Override public String getProxyHost() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ApiNotSupportedException, NoSuchFieldException { if (proxyPropertiesContainer == null) throw new WifiProxyNotSettedException(); return proxyPropertiesContainer.getHost(); } @Override public int getProxyPort() throws ApiNotSupportedException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, NoSuchFieldException { if (proxyPropertiesContainer == null) throw new WifiProxyNotSettedException(); return proxyPropertiesContainer.getPort(); } @Override public boolean isProxySetted() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ApiNotSupportedException, NoSuchFieldException { return !(proxyPropertiesContainer == null); } private LinkProperties getLinkProperties() throws NoSuchFieldException, IllegalAccessException { return (LinkProperties) ReflectionHelper.getField(wifiConfiguration, "linkProperties"); } private Object getCurrentProxyProperties() throws NoSuchFieldException, IllegalAccessException { return ReflectionHelper.getDeclaredField(getLinkProperties(), "mHttpProxy"); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public abstract class ProxyInfoConstructor { public static ProxyInfo proxyInfo(String host, int port) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException { return proxyInfo(host, port, null); } public static ProxyInfo proxyInfo(String host, int port, String exclude) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException { Object newProxyInfo = proxyInfoConstructor().newInstance(host, port, exclude); return (ProxyInfo) newProxyInfo; } private static Constructor proxyInfoConstructor() throws ClassNotFoundException, NoSuchMethodException { return Class.forName("android.net.ProxyInfo").getConstructor(String.class, int.class, String.class); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public class WifiConfigurationForApiFrom21To22 extends BaseWifiConfiguration implements ProxyChanger { public WifiConfigurationForApiFrom21To22(Context context) throws NullWifiConfigurationException { super(context); } public static WifiConfigurationForApiFrom21To22 createFromCurrentContext(Context context) throws NullWifiConfigurationException { return new WifiConfigurationForApiFrom21To22(context); } @Override public ProxySettings getProxySettings() throws NoSuchFieldException, IllegalAccessException { return ProxySettings.valueOf(String.valueOf(ReflectionHelper.getDeclaredField(getIpConfigurationObject(), "proxySettings"))); } @Override public void setProxySettings(ProxySettings proxySettings) throws NoSuchFieldException, IllegalAccessException { ReflectionHelper.setEnumField(getIpConfigurationObject(), proxySettings.getValue(), "proxySettings"); } @Override public void setProxyHostAndPort(String host, int port) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, NoSuchFieldException { setProxyInfo(ProxyInfoConstructor.proxyInfo(host, port)); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) @Override public String getProxyHost() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ApiNotSupportedException { ProxyInfo info = getProxyInfo(); if (info == null) throw new WifiProxyNotSettedException(); return info.getHost(); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) @Override public int getProxyPort() throws ApiNotSupportedException, NoSuchMethodException, IllegalAccessException, InvocationTargetException { ProxyInfo info = getProxyInfo(); if (info == null) throw new WifiProxyNotSettedException(); return info.getPort(); } @Override public boolean isProxySetted() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ApiNotSupportedException, NoSuchFieldException { return !(getProxyInfo() == null); } private Object getIpConfigurationObject() throws NoSuchFieldException, IllegalAccessException { return ReflectionHelper.getDeclaredField(wifiConfiguration, "mIpConfiguration"); } private ProxyInfo getProxyInfo() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException { return (ProxyInfo) ReflectionHelper.getMethodAndInvokeIt(wifiConfiguration, "getHttpProxy"); } private void setProxyInfo(ProxyInfo proxyInfo) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException, NoSuchFieldException { ReflectionHelper.getMethodAndInvokeIt(wifiConfiguration, "setHttpProxy", proxyInfo); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public abstract class CurrentProxyChangerGetter { public static ProxyChanger chooseProxyChangerForCurrentApi(Context context) throws ApiNotSupportedException, NoSuchFieldException, IllegalAccessException, NullWifiConfigurationException { if (ApiChecker.isJellyBeanOrKitkat()) { return WifiConfigurationForApiFrom15To19.createFromCurrentContext(context); } else if (ApiChecker.isLolipop()) { return WifiConfigurationForApiFrom21To22.createFromCurrentContext(context); } else { throw new ApiNotSupportedException(); } } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public abstract class WifiProxyChanger { public static void changeWifiStaticProxySettings(String host, int port, Context context) throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException, NoSuchFieldException, ApiNotSupportedException, NullWifiConfigurationException { updateWifiWithNewConfiguration( getCurrentWifiConfiguretionWithUpdatedSettings(host, port, ProxySettings.STATIC, context), context); } public static void clearProxySettings(Context context) throws IllegalAccessException, ApiNotSupportedException, NoSuchFieldException, NullWifiConfigurationException, ClassNotFoundException, NoSuchMethodException, InstantiationException, InvocationTargetException { updateWifiWithNewConfiguration( getCurrentWifiConfiguretionWithUpdatedSettings("", 0, ProxySettings.NONE, context), context); } private static WifiConfiguration getCurrentWifiConfiguretionWithUpdatedSettings(String host, int port, ProxySettings proxySettings, Context context) throws ApiNotSupportedException, IllegalAccessException, NullWifiConfigurationException, NoSuchFieldException, ClassNotFoundException, NoSuchMethodException, InstantiationException, InvocationTargetException { ProxyChanger proxyChanger = CurrentProxyChangerGetter.chooseProxyChangerForCurrentApi(context); proxyChanger.setProxyHostAndPort(host, port); proxyChanger.setProxySettings(proxySettings); return proxyChanger.getWifiConfiguration(); } private static void updateWifiWithNewConfiguration(WifiConfiguration wifiConfiguration, Context context) { WifiManager currentWifiManager = NetworkHelper.getWifiManager(context); currentWifiManager.updateNetwork(wifiConfiguration); currentWifiManager.saveConfiguration(); currentWifiManager.reconnect(); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public abstract class WifiProxyInfo { public static String getHost(Context context) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ApiNotSupportedException, NoSuchFieldException, NullWifiConfigurationException { return CurrentProxyChangerGetter.chooseProxyChangerForCurrentApi(context).getProxyHost(); } public static int getPort(Context context) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ApiNotSupportedException, NoSuchFieldException, NullWifiConfigurationException { return CurrentProxyChangerGetter.chooseProxyChangerForCurrentApi(context).getProxyPort(); } public static ProxySettings getProxySettings(Context context) throws ApiNotSupportedException, IllegalAccessException, NoSuchFieldException, NullWifiConfigurationException { return CurrentProxyChangerGetter.chooseProxyChangerForCurrentApi(context).getProxySettings(); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public abstract class ApiChecker { public static boolean isJellyBeanOrKitkat() { return Build.VERSION.SDK_INT > 14 && Build.VERSION.SDK_INT < 20; } public static boolean isLolipop() { return Build.VERSION.SDK_INT > 20 && Build.VERSION.SDK_INT < 23; } public static boolean isSupportedApi() { return isJellyBeanOrKitkat() || isLolipop(); } }
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
     

 public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); changeProxySettings("myhost.com", 12345); } void changeProxySettings(String host, int port) { try { WifiProxyChanger.changeWifiStaticProxySettings(host, port, this); } catch (ClassNotFoundException | NoSuchMethodException | InstantiationException | InvocationTargetException | NoSuchFieldException | IllegalAccessException | NullWifiConfigurationException | ApiNotSupportedException e) { e.printStackTrace(); } } }