我正在使用以下代码连接到没有互联网连接的WiFi网络,因为它拥有自己的网络服务器,我想连接即使没有互联网连接.
WifiConfiguration wifiConfiguration = new WifiConfiguration();
wifiConfiguration.SSID = String.format("\"%s\"",scanResult.SSID);
wifiConfiguration.preSharedKey = String.format("\"%s\"","secret");
int netId = wifiManager.addNetwork(wifiConfiguration)
wifiManager.disconnect();
wifiManager.enableNetwork(netId,true);
wifiManager.reconnect();
这适用于Android Marshmallow下面的每个设备(我使用CM13,所以它可能与CyanogenMod有关？)：当我使用此代码连接时,Android仍然使用移动连接并用感叹号标记WiFi符号.几秒钟之后它会显示一个问题通知我是否要保持连接,因为网络没有互联网连接.
问题：我的应用尝试自动连接到我的网络服务器失败,因为显然没有互联网连接.当然可以等到我能够访问我的网络服务器,但它应该在没有用户交互的情况下工作.
ChromeCast或任何其他物联网设备如何解决这个问题？我在设置ChromeCast设备时从未看到过这样的通知.
解决方法
我通过绑定(connectivityManager.bindProcesstoNetwork(network);)将当前进程绑定到连接的网络来解决这个问题.这可以防止“继续使用此网络”对话框,并允许您通过wifi与设备通信.
NetworkRequest.Builder builder;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
builder = new NetworkRequest.Builder();
//set the transport type do WIFI
builder.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
connectivityManager.requestNetwork(builder.build(),new ConnectivityManager.NetworkCallback() {
@Override
public void onAvailable(Network network) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (Build.VERSION.RELEASE.equalsIgnoreCase("6.0")) {
if (!Settings.System.canWrite(mActivity)) {
Intent goToSettings = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS);
goToSettings.setData(Uri.parse("package:" + mActivity.getPackageName()));
mActivity.startActivity(goToSettings);
}
}
connectivityManager.bindProcesstoNetwork(null);
if (mSsid.contains("my_iot_device-xxxxxxxxx")) {
connectivityManager.bindProcesstoNetwork(network);
} else {
}
} else {
//This method was deprecated in API level 23
ConnectivityManager.setProcessDefaultNetwork(null);
if (mSsid.contains("my_iot_device-xxxxxxxxx")) {
ConnectivityManager.setProcessDefaultNetwork(network);
} else {
}
}
try {
//do a callback or something else to alert your code that it's ok to send the message through socket Now
} catch (Exception e) {
Crashlytics.logException(e);
e.printstacktrace();
}
connectivityManager.unregisterNetworkCallback(this);
}
});
}