即使Android M上的移动数据处于打开状态(连接)，也可以通过WiFi发送请求(不连接) [英] Send request over WiFi (without connection) even if Mobile data is ON (with connection) on Android M

问题描述

我必须在没有Internet连接的情况下将UDP数据包发送到WiFi模块(由自己的AP提供)，但是当我将移动设备与AP连接时，Android会在移动数据接口上重定向我的数据包，因为它已与Internet连接. /p>

我已经使用下面的代码来完成工作，但似乎无法在Android M上正常工作.

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void setWifiInterfaceAsDefault() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkRequest.Builder builder = new NetworkRequest.Builder();
    NetworkRequest networkRequest= builder.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED)
            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
            .build();

    connectivityManager.requestNetwork(networkRequest, new ConnectivityManager.NetworkCallback());
}

我还添加了

<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />

在我的AndroidManifest.xml上，我确保自己Settings.System.canWrite(this)返回true，但什么也没有.

提前谢谢.

解决方案

使用ConnectivityManager.setProcessDefaultNetwork()绑定网络可防止漫游并允许完整的TCP访问.因此，在onAvailable()回调中，您可以将应用程序进程绑定到该网络，而不用打开与特定URL的连接.

ConnectivityManager connection_manager = 
(ConnectivityManager) activity.getApplication().getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkRequest.Builder request = new NetworkRequest.Builder();
request.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);

connection_manager.registerNetworkCallback(request.build(), new NetworkCallback() {

    @Override
    public void onAvailable(Network network) {
        ConnectivityManager.setProcessDefaultNetwork(network);
    }
}

原始答案

I have to send UDP packets to a WiFi module (provided with own AP) with no internet connection but when I connect the mobile with the AP, Android redirects my packets on the mobile data interface because it has got internet connection.

I've used the code below to do my job but it seems not working on Android M.

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void setWifiInterfaceAsDefault() {
    ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkRequest.Builder builder = new NetworkRequest.Builder();
    NetworkRequest networkRequest= builder.addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_RESTRICTED)
            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
            .build();

    connectivityManager.requestNetwork(networkRequest, new ConnectivityManager.NetworkCallback());
}

I've also added

<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />

on my AndroidManifest.xml and I ensured myself that Settings.System.canWrite(this) returns true but still nothing.

Thanks in advance.

解决方案

Bind the network using ConnectivityManager.setProcessDefaultNetwork() prevents roaming and allows for full TCP access. Thus, within the onAvailable() callback you could bind the application process to that network rather than opening a connection to a particular URL.

ConnectivityManager connection_manager = 
(ConnectivityManager) activity.getApplication().getSystemService(Context.CONNECTIVITY_SERVICE);

NetworkRequest.Builder request = new NetworkRequest.Builder();
request.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);

connection_manager.registerNetworkCallback(request.build(), new NetworkCallback() {

    @Override
    public void onAvailable(Network network) {
        ConnectivityManager.setProcessDefaultNetwork(network);
    }
}

Original answer

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