android - 如何在连接 WiFi 的情况下使用移动数据服务？

Question

我正在开发一个测试应用程序，它必须能够选择 WiFi 或移动数据服务。以下代码显示 WiFi 和移动网络均已连接，但 bindProcessToNetwork() 在移动网络上失败。

public class MyActivity extends AppCompatActivity {
    private ConnectivityManager mConnMgr = null;
    private Network mNetworkWiFi = null;
    private Network mNetworkMobile = null;

    mConnMgr =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
    boolean isWifiConn = false;
    boolean isMobileConn = false;
    for (Network network : mConnMgr.getAllNetworks()) {
        NetworkInfo networkInfo = mConnMgr.getNetworkInfo(network);

        if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
            isWifiConn = networkInfo.isConnected();
            mNetworkWiFi = network;
        }
        if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
            isMobileConn = networkInfo.isConnected();
            mNetworkMobile = network;
        }
    }

    if (mNetworkMobile && mConnMgr.getNetworkInfo(mNetworkMobile).isConnected()) {
        if (true != mConnMgr.bindProcessToNetwork(mNetworkMobile)) {
            Log.i(TAG, "Failed to bind to Mobile");
        }
    }

问题: 1. bindProcessToNetwork() 是在WiFi和Mobile之间选择数据服务的正确方法吗？ 2. 什么可能导致 bindProcessToNetwork() 在连接的移动网络上失败？

Answer 1

下面的代码让我在连接 WiFi 时使用移动数据服务:

                final NetworkRequest networkReq = new NetworkRequest.Builder().addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET).addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR).build();
                mConnMgr.requestNetwork(networkReq, new ConnectivityManager.NetworkCallback() {
                    @Override
                    public void onAvailable(Network network) {
                        Log.i(TAG, "Requested netwwork available: " + network.toString());
                        if (true != mConnMgr.bindProcessToNetwork(network)) {
                            Log.i(TAG, "Failed to bind to Mobile");
                        }

                    }
                });