Android-雙網(wǎng)絡(luò)實(shí)現(xiàn)

原本很早就想把這些東西寫文章保留下來锦针，但是只怪自己真的太懶啦仁堪，2年后的今天才開始整理當(dāng)時(shí)工作時(shí)的思路

背景

借助Android 4G 阶捆，WiFi 雙網(wǎng)絡(luò)模式可以互補(bǔ)倦卖，大大的提高應(yīng)用的穩(wěn)定性
作為一款工具類產(chǎn)品鸠匀，WiFi蕉斜，4G流量，使我們的業(yè)務(wù)重心，如何將4G & WiFi
徹底打通蛛勉，為用戶提供更沉浸式的服務(wù)體驗(yàn)鹿寻，使我們一直以來的最求

思路

非常感謝國外的一款產(chǎn)品，在實(shí)現(xiàn)上為我們提供了一個入門的思路 speedify

no bb show my code
如果有人感興趣這個實(shí)現(xiàn)過程诽凌，可以單獨(dú)來交流

具體實(shí)現(xiàn)方案

準(zhǔn)備工作：
1. 此方案借助了VPN來實(shí)現(xiàn)本地流量的劫持毡熏，并控制發(fā)送網(wǎng)絡(luò)通道
2. 因?yàn)锳ndroid版本的差異性，實(shí)現(xiàn)方案也將按照高低不同版本來設(shè)計(jì)
3. 因?yàn)楝F(xiàn)在手上已經(jīng)沒有那么多資源侣诵，所以更多的是代碼和思路講解痢法，如果你感興趣可能需要自己做一部分前置工作
  eg： VPN 搭建，后臺配套服務(wù)

基本實(shí)現(xiàn)思路

API < 6.0

啟動Android手機(jī)高速網(wǎng)卡杜顺，在啟動成功后將高速網(wǎng)卡和 VPN出口IP綁定

  public class SetupHIPRIEnableTask extends TimerTask {

    private static final String TAG = "SetupHIPRIEnableTask\t";

    private Context mContext;

    public SetupHIPRIEnableTask(Context context) {
        mContext = context;
    }

    @Override
    public void run() {
        try {
            DLog.i(TAG + "Polling mobile network to make sure it stays up");
            ConnectivityManager connectivityManager = (ConnectivityManager) mContext
                    .getSystemService(CONNECTIVITY_SERVICE);
            if (connectivityManager == null) {
                Log.e(TAG, "ConnectivityManager is null, cannot try to force a mobile connection");
            } else if (connectivityManager.getNetworkInfo(5) == null) {
                Log.e(TAG, "Mobile Interface Not Found.");
            } else {
                int startUsingNetworkFeature = connectivityManager.startUsingNetworkFeature(0, "enableHIPRI");
                Log.d(TAG, "startUsingNetworkFeature for enableHIPRI result: " + startUsingNetworkFeature);
                if (-1 == startUsingNetworkFeature) {
                    Log.e(TAG, "Wrong result of startUsingNetworkFeature, maybe problems");
                }
                if (connectivityManager.getNetworkInfo(5).getState().compareTo(NetworkInfo.State.CONNECTED) == 0) {
                    Log.d(TAG, "Mobile network is connected");
                } else {
                    Log.d(TAG, "Mobile network is not connected");
                }
            }
            requestRouteToHost();
        } catch (Exception e) {
            Log.e(TAG, "Hit error in KeepMobileAliveTask ", e);
        }
    }

    /**
     * 等待 ： TYPE_MOBILE_HIPRI類型的網(wǎng)絡(luò)建立連接后
     * <p/>
     * deliver traffic to the specified host via the specified network interface
     */
    private void requestRouteToHost() {
        String ip = AuthDataManager.getInstance().getAuthData().getIp();
        int i = AppUtil.convertIpToInt(ip);
        ConnectivityManager connectivityManager = (ConnectivityManager) mContext.getSystemService(CONNECTIVITY_SERVICE);
        if (connectivityManager == null) {
            DLog.i(TAG + "ConnectivityManager is null, cannot try to force a mobile connection");
        } else if (connectivityManager.getNetworkInfo(5) == null) {
            DLog.i(TAG + "Mobile Interface Not Found.");
        } else {
            int i2 = 0;
            while (i2 < 20) {
                try {
                    if (connectivityManager.getNetworkInfo(5).getState().compareTo(NetworkInfo.State.CONNECTED) == 0) {
                        break;
                    }
                    Thread.sleep(1000);
                    i2++;
                } catch (InterruptedException ignored) {
                }
            }
            DLog.i(TAG + "requestRouteToHost result: " + connectivityManager.requestRouteToHost(5, i));
        }
    }

}

API >= 6.0

通過Android標(biāo)準(zhǔn)API在WiFi連接的情況下财搁，請求4G網(wǎng)絡(luò)通道，

當(dāng)4G網(wǎng)絡(luò)通道成功后躬络，Android會回調(diào)一個networkId 尖奔，

通過NDK將此networkId與VPN的上網(wǎng)了進(jìn)程綁定，從而實(shí)現(xiàn)走VPN的數(shù)據(jù)流量都通過4G 網(wǎng)絡(luò)

public void requestWorkNetForHigh(Context context) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        if (cm == null) {
            DLog.i("ConnectivityManager is null, cannot try to force a mobile connection");
            return;
        }
        DLog.i("post50MobileEnable, requesting Cellular network");
        NetworkRequest.Builder builder = new NetworkRequest.Builder();
        builder.addTransportType(0);
        builder.addCapability(12);
        NetworkRequest build = builder.build();
        unregisterNetworkCallback();
        try {
            if (mNetWorkCallBack == null) {
                mNetWorkCallBack = new MNetWorkCallBack();
            }
            DLog.i("Requesting Connectivity Manager");
            cm.requestNetwork(build, mNetWorkCallBack);
        } catch (SecurityException e) {
            DLog.i("com.speedify.speedifyAndroid.MobileController Cannot write settings. Requesting Permission");

        } catch (Exception e2) {
            DLog.e("Unknown Exception", e2);
            e2.printStackTrace();
        }
    }

  private class MNetWorkCallBack extends ConnectivityManager.NetworkCallback {

        @Override
        public void onAvailable(Network network) {
            DLog.i(TAG + "NetWorkCallBack " + network);
            super.onAvailable(network);
        }
    }

POC當(dāng)時(shí)的技術(shù)結(jié)論：

技術(shù)POC測試結(jié)論

--未完待補(bǔ)充