Android 9 系统设置中添加以太网开关按钮

Android 9 系统设置中添加以太网开关按钮

本章突出新手可以简单快速实现该需求。（具体以太网流程自行百度）

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首先在系统Settings设置选项中添加选项。（该部分逻辑以及如何在获取设置按钮的开关状态，不在这里介绍，过往有做过介绍）

这里采用广播的方式通知framework层去开关以太网。

Android P 对广播做了保护

因此我们需要在/frameworks/base/core/res/AndroidManifest.xml中定义我们的广播
广播名称可以随意定义，注意勿重复！

接着就是最关键部分
frameworks/opt/net/ethernet/java/com/android/server/ethernet/EthernetTracker.java

先看代码：

package com.android.server.ethernet;

...

final class EthernetTracker {
    private final static String TAG = EthernetTracker.class.getSimpleName();
    private final static boolean DBG = EthernetNetworkFactory.DBG;

    /** Product-dependent regular expression of interface names we track. */
    private final String mIfaceMatch;

    /** Mapping between {iface name | mac address} -> {NetworkCapabilities} */
    private final ConcurrentHashMap<String, NetworkCapabilities> mNetworkCapabilities =
            new ConcurrentHashMap<>();
    private final ConcurrentHashMap<String, IpConfiguration> mIpConfigurations =
            new ConcurrentHashMap<>();

    private final INetworkManagementService mNMService;
    private final Handler mHandler;
    private final EthernetNetworkFactory mFactory;
    private final EthernetConfigStore mConfigStore;

    private final RemoteCallbackList<IEthernetServiceListener> mListeners =
            new RemoteCallbackList<>();

    private volatile IpConfiguration mIpConfigForDefaultInterface;

+    private Context mContext;
+    String eth0Action = "android.eth0.power.status";

    EthernetTracker(Context context, Handler handler) {
        mHandler = handler;

+        mContext = context;

        // The services we use.
        IBinder b = ServiceManager.getService(Context.NETWORKMANAGEMENT_SERVICE);
        mNMService = INetworkManagementService.Stub.asInterface(b);

        // Interface match regex.
        mIfaceMatch = context.getResources().getString(
                com.android.internal.R.string.config_ethernet_iface_regex);

        // Read default Ethernet interface configuration from resources
        final String[] interfaceConfigs = context.getResources().getStringArray(
                com.android.internal.R.array.config_ethernet_interfaces);
        for (String strConfig : interfaceConfigs) {
            parseEthernetConfig(strConfig);
        }

        mConfigStore = new EthernetConfigStore();

        NetworkCapabilities nc = createNetworkCapabilities(true /* clear default capabilities */);
        mFactory = new EthernetNetworkFactory(handler, context, nc);
        mFactory.register();

+        IntentFilter intentFilter = new IntentFilter();
+        intentFilter.addAction(eth0Action);
+        mContext.registerReceiver(new EthBroadcast(), intentFilter);

+        mHandler.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                Log.d("yy", "run auto update eht0 power after 5s.  tips: def is true");
+                setInterfaceStatus(SystemProperties.get("persist.sys.edu.eth0.power","1").equals("1"));

+            }
+        }, 5000);

+    }

+     class  EthBroadcast extends BroadcastReceiver{

+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (intent.getAction() != null) {
+                if (intent.getAction().equals(eth0Action)) {

+                   boolean power = intent.getBooleanExtra("power", true);
+                    Log.d("yy", "EthBroadcast onReceive: "+power);
+                    SystemProperties.set("persist.sys.edu.eth0.power",power?"1":"0");
+                    setInterfaceStatus(power);
+
+                }
+            }
+        }
+    }

+    public boolean setInterfaceStatus(boolean state){
+        Log.d("yy", "setInterfaceStatus: state:"+state);
+        		 try {
+                       if(!TextUtils.isEmpty("eth0")) {
+                                if(!state)
+                                    mNMService.setInterfaceDown("eth0");
+                				else
+                					mNMService.setInterfaceUp("eth0");
+                                return true;
+                            } else {
+                                Log.e("yy","iface is null");
+                            }
+                    } catch (Exception e) {
+                        Log.e("yy", "Error setInterfaceStatus : " + "eth0" + " state : " + state + " exception : " + e);
+                    }
+                return false;

    }

    void start() {
        mConfigStore.read();

        // Default interface is just the first one we want to track.
        mIpConfigForDefaultInterface = mConfigStore.getIpConfigurationForDefaultInterface();
        final ArrayMap<String, IpConfiguration> configs = mConfigStore.getIpConfigurations();
        for (int i = 0; i < configs.size(); i++) {
            mIpConfigurations.put(configs.keyAt(i), configs.valueAt(i));
        }

        try {
            mNMService.registerObserver(new InterfaceObserver());
        } catch (RemoteException e) {
            Log.e(TAG, "Could not register InterfaceObserver " + e);
        }

        mHandler.post(this::trackAvailableInterfaces);
    }

    void updateIpConfiguration(String iface, IpConfiguration ipConfiguration) {
        if (DBG) {
            Log.i(TAG, "updateIpConfiguration, iface: " + iface + ", cfg: " + ipConfiguration);
        }

        mConfigStore.write(iface, ipConfiguration);
        mIpConfigurations.put(iface, ipConfiguration);

        mHandler.post(() -> mFactory.updateIpConfiguration(iface, ipConfiguration));
    }

    IpConfiguration getIpConfiguration(String iface) {
        return mIpConfigurations.get(iface);
    }

    boolean isTrackingInterface(String iface) {
        return mFactory.hasInterface(iface);
    }

    String[] getInterfaces(boolean includeRestricted) {
        return mFactory.getAvailableInterfaces(includeRestricted);
    }

    /**
     * Returns true if given interface was configured as restricted (doesn't have
     * NET_CAPABILITY_NOT_RESTRICTED) capability. Otherwise, returns false.
     */
    boolean isRestrictedInterface(String iface) {
        final NetworkCapabilities nc = mNetworkCapabilities.get(iface);
        return nc != null && !nc.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED);
    }

    void addListener(IEthernetServiceListener listener, boolean canUseRestrictedNetworks) {
        mListeners.register(listener, new ListenerInfo(canUseRestrictedNetworks));
    }

    void removeListener(IEthernetServiceListener listener) {
        mListeners.unregister(listener);
    }

    void removeInterface(String iface) {
        mFactory.removeInterface(iface);
    }

    private void addInterface(String iface) {
        InterfaceConfiguration config = null;
        // Bring up the interface so we get link status indications.
        try {
            mNMService.setInterfaceUp(iface);
            config = mNMService.getInterfaceConfig(iface);
        } catch (RemoteException | IllegalStateException e) {
            // Either the system is crashing or the interface has disappeared. Just ignore the
            // error; we haven't modified any state because we only do that if our calls succeed.
            Log.e(TAG, "Error upping interface " + iface, e);
        }

        if (config == null) {
            Log.e(TAG, "Null interface config for " + iface + ". Bailing out.");
            return;
        }

        final String hwAddress = config.getHardwareAddress();

        NetworkCapabilities nc = mNetworkCapabilities.get(iface);
        if (nc == null) {
            // Try to resolve using mac address
            nc = mNetworkCapabilities.get(hwAddress);
            if (nc == null) {
                nc = createDefaultNetworkCapabilities();
            }
        }
        IpConfiguration ipConfiguration = mIpConfigurations.get(iface);
        if (ipConfiguration == null) {
            ipConfiguration = createDefaultIpConfiguration();
        }

        Log.d(TAG, "Started tracking interface " + iface);
        mFactory.addInterface(iface, hwAddress, nc, ipConfiguration);

        // Note: if the interface already has link (e.g., if we crashed and got
        // restarted while it was running), we need to fake a link up notification so we
        // start configuring it.
        if (config.hasFlag("running")) {
            updateInterfaceState(iface, true);
        }
    }

    private void updateInterfaceState(String iface, boolean up) {
        boolean modified = mFactory.updateInterfaceLinkState(iface, up);
        if (modified) {
            boolean restricted = isRestrictedInterface(iface);
            int n = mListeners.beginBroadcast();
            for (int i = 0; i < n; i++) {
                try {
                    if (restricted) {
                        ListenerInfo listenerInfo = (ListenerInfo) mListeners.getBroadcastCookie(i);
                        if (!listenerInfo.canUseRestrictedNetworks) {
                            continue;
                        }
                    }
                    mListeners.getBroadcastItem(i).onAvailabilityChanged(iface, up);
                } catch (RemoteException e) {
                    // Do nothing here.
                }
            }
            mListeners.finishBroadcast();
        }
    }

    private void maybeTrackInterface(String iface) {
        if (DBG) Log.i(TAG, "maybeTrackInterface " + iface);
        // If we don't already track this interface, and if this interface matches
        // our regex, start tracking it.
        if (!iface.matches(mIfaceMatch) || mFactory.hasInterface(iface)) {
            return;
        }

        if (mIpConfigForDefaultInterface != null) {
            updateIpConfiguration(iface, mIpConfigForDefaultInterface);
            mIpConfigForDefaultInterface = null;
        }

        addInterface(iface);
    }

    private void trackAvailableInterfaces() {
        try {
            final String[] ifaces = mNMService.listInterfaces();
            for (String iface : ifaces) {
                maybeTrackInterface(iface);
            }
        } catch (RemoteException | IllegalStateException e) {
            Log.e(TAG, "Could not get list of interfaces " + e);
        }
    }


    private class InterfaceObserver extends BaseNetworkObserver {

        @Override
        public void interfaceLinkStateChanged(String iface, boolean up) {
            if (DBG) {
                Log.i(TAG, "interfaceLinkStateChanged, iface: " + iface + ", up: " + up);
            }
            mHandler.post(() -> updateInterfaceState(iface, up));
        }

        @Override
        public void interfaceAdded(String iface) {
            mHandler.post(() -> maybeTrackInterface(iface));
        }

        @Override
        public void interfaceRemoved(String iface) {
            mHandler.post(() -> removeInterface(iface));
        }
    }

    private static class ListenerInfo {

        boolean canUseRestrictedNetworks = false;

        ListenerInfo(boolean canUseRestrictedNetworks) {
            this.canUseRestrictedNetworks = canUseRestrictedNetworks;
        }
    }

    private void parseEthernetConfig(String configString) {
        String[] tokens = configString.split(";");
        String name = tokens[0];
        String capabilities = tokens.length > 1 ? tokens[1] : null;
        NetworkCapabilities nc = createNetworkCapabilities(
                !TextUtils.isEmpty(capabilities)  /* clear default capabilities */, capabilities);
        mNetworkCapabilities.put(name, nc);

        if (tokens.length > 2 && !TextUtils.isEmpty(tokens[2])) {
            IpConfiguration ipConfig = parseStaticIpConfiguration(tokens[2]);
            mIpConfigurations.put(name, ipConfig);
        }
    }

    private static NetworkCapabilities createDefaultNetworkCapabilities() {
        NetworkCapabilities nc = createNetworkCapabilities(false /* clear default capabilities */);
        nc.addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET);
        nc.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED);
        nc.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED);
        nc.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_ROAMING);
        nc.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_CONGESTED);

        return nc;
    }

    private static NetworkCapabilities createNetworkCapabilities(boolean clearDefaultCapabilities) {
        return createNetworkCapabilities(clearDefaultCapabilities, null);
    }

    private static NetworkCapabilities createNetworkCapabilities(
            boolean clearDefaultCapabilities, @Nullable String commaSeparatedCapabilities) {

        NetworkCapabilities nc = new NetworkCapabilities();
        if (clearDefaultCapabilities) {
            nc.clearAll();  // Remove default capabilities.
        }
        nc.addTransportType(NetworkCapabilities.TRANSPORT_ETHERNET);
        nc.setLinkUpstreamBandwidthKbps(100 * 1000);
        nc.setLinkDownstreamBandwidthKbps(100 * 1000);

        if (!TextUtils.isEmpty(commaSeparatedCapabilities)) {
            for (String strNetworkCapability : commaSeparatedCapabilities.split(",")) {
                if (!TextUtils.isEmpty(strNetworkCapability)) {
                    nc.addCapability(Integer.valueOf(strNetworkCapability));
                }
            }
        }

        return nc;
    }

    /**
     * Parses static IP configuration.
     *
     * @param staticIpConfig represents static IP configuration in the following format: {@code
     * ip= gateway= dns=
     *     domains=}
     */
    @VisibleForTesting
    static IpConfiguration parseStaticIpConfiguration(String staticIpConfig) {
        StaticIpConfiguration ipConfig = new StaticIpConfiguration();

        for (String keyValueAsString : staticIpConfig.trim().split(" ")) {
            if (TextUtils.isEmpty(keyValueAsString)) continue;

            String[] pair = keyValueAsString.split("=");
            if (pair.length != 2) {
                throw new IllegalArgumentException("Unexpected token: " + keyValueAsString
                        + " in " + staticIpConfig);
            }

            String key = pair[0];
            String value = pair[1];

            switch (key) {
                case "ip":
                    ipConfig.ipAddress = new LinkAddress(value);
                    break;
                case "domains":
                    ipConfig.domains = value;
                    break;
                case "gateway":
                    ipConfig.gateway = InetAddress.parseNumericAddress(value);
                    break;
                case "dns": {
                    ArrayList<InetAddress> dnsAddresses = new ArrayList<>();
                    for (String address: value.split(",")) {
                        dnsAddresses.add(InetAddress.parseNumericAddress(address));
                    }
                    ipConfig.dnsServers.addAll(dnsAddresses);
                    break;
                }
                default : {
                    throw new IllegalArgumentException("Unexpected key: " + key
                            + " in " + staticIpConfig);
                }
            }
        }
        return new IpConfiguration(IpAssignment.STATIC, ProxySettings.NONE, ipConfig, null);
    }

    private static IpConfiguration createDefaultIpConfiguration() {
        return new IpConfiguration(IpAssignment.DHCP, ProxySettings.NONE, null, null);
    }

    private void postAndWaitForRunnable(Runnable r) {
        mHandler.runWithScissors(r, 2000L /* timeout */);
    }

    void dump(FileDescriptor fd, IndentingPrintWriter pw, String[] args) {
        postAndWaitForRunnable(() -> {
            pw.println(getClass().getSimpleName());
            pw.println("Ethernet interface name filter: " + mIfaceMatch);
            pw.println("Listeners: " + mListeners.getRegisteredCallbackCount());
            pw.println("IP Configurations:");
            pw.increaseIndent();
            for (String iface : mIpConfigurations.keySet()) {
                pw.println(iface + ": " + mIpConfigurations.get(iface));
            }
            pw.decreaseIndent();
            pw.println();

            pw.println("Network Capabilities:");
            pw.increaseIndent();
            for (String iface : mNetworkCapabilities.keySet()) {
                pw.println(iface + ": " + mNetworkCapabilities.get(iface));
            }
            pw.decreaseIndent();
            pw.println();

            mFactory.dump(fd, pw, args);
        });
    }
}

上述修改：在EthernetTracker中注册广播监听器，监听setting按钮状态，
然后mNMService.setInterfaceDown(“eth0”);和mNMService.setInterfaceUp(“eth0”);开关以太网！