我有一些奇怪的问题，当我想验证，Android设备是否连接到特定Wi-Fi（由SSID标识），它有一个移动数据网络的同时活跃。这也可能是我的问题连接到Android 9（SDK 28），因为我没有从以前的版本的Android用户得到任何投诉。
因此，这里是我有：
这是我的主要方法，应该告诉我，该设备目前是否已连接到它的目标的Wi-Fi：
public boolean isConnectedToTrackerHotSpot() {
if (isConnectedToWiFi()) {
final String ssid = getConnectedSSID();
if (ssid.startsWith(TRACKER_WIFI_PREFIX)) {
Log.i(TAG, "isConnectedToTrackerHotSpot() --> YEAH, connected to Tracker: " + ssid);
return true;
} else {
Log.d(TAG, "isConnectedToTrackerHotSpot() --> NOT connected to Tracker, but: " + ssid);
return false;
}
}
Log.d(TAG, "isConnectedToTrackerHotSpot() --> NOT connected to any Wi-Fi!");
return false;
}
下面是辅助方法：
检查我们当前是否有Wi-Fi连接：
public boolean isConnectedToWiFi() {
if (!isWifiEnabled()) {
Log.w(TAG, "isConnectedToWiFi(): Wi-Fi is DISABLED");
return false;
}
final WifiInfo wifiInfo = getConnectionInfo();
if (wifiInfo == null) {
Log.w(TAG, "isConnectedToWiFi() --> wifiInfo is null!");
return false;
}
final int networkId = wifiInfo.getNetworkId();
if (networkId == -1) {
Log.d(TAG, "isConnectedToWiFi() --> NOT connected to any Wi-Fi (networkId == -1)");
return false;
}
Log.d(TAG, "isConnectedToWiFi() --> connected to Wi-Fi with networkId: " + networkId);
return true;
}
检查我们是否连接到任何网络都：
public boolean isConnected() {
/*
Returns details about the currently active default data network.
When connected, this network is the default route for outgoing connections.
*/
final NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo == null) {
Log.d(TAG, "isConnected() --> getActiveNetworkInfo() == NULL (no network connection)");
return false;
} else {
Log.d(TAG, "isConnected() --> networkInfo.getTypeName() = " + networkInfo.getTypeName());
}
if (networkInfo.isConnectedOrConnecting()) {
return true;
}
Log.w(TAG, "isConnected() --> !networkInfo.isConnectedOrConnecting()");
return false;
}
现在在我的广播接收器，我想只要我已经连接到了预期的设备处理的情况下：
private BroadcastReceiver connectivityBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (!Objects.equals(intent.getAction(), CONNECTIVITY_CHANGE)) {
Log.d(TAG, "connectivityBroadcastReceiver.onReceive() --> not the intent we are interested in");
return;
}
if (wiFiConnectionManager.isConnectedToTrackerHotSpot()) {
Log.i(TAG, "connectivityBroadcastReceiver.onReceive() --> CONNECTED to Tracker --> fragment.updateUiConnectedToTracker()");
fragment.updateUiConnectedToTracker();
openTrackerSocketConnection();
} else {
// Make sure we only show 1 AlertDialog per CONNECT attempt (= button press)
if (userAwaitsResponse) {
Log.d(TAG, "connectivityBroadcastReceiver.onReceive() --> fragment.updateUiFailedToConnect()");
fragment.updateUiFailedToConnect();
userAwaitsResponse = false;
} else {
Log.d(TAG, "connectivityBroadcastReceiver.onReceive() --> SUPPRESSING UI update (since already done)");
}
}
}
};
然而，当我测试此上的像素3采用Android 9，让启用移动网络，我得到这个日志：
D/ConnectDeviceFragment: connectButton --> onClick()
I/WiFiConnectionManager: isWiFiEnabled(): true
I/WiFiConnectionManager: isWiFiEnabled(): true
D/ConnectDeviceFragmentPresenter: connectToTrackersWiFi() --> use existing WifiConfiguration SSID: "TRACKER-pat08" (networkId: 141)
D/ConnectDeviceFragmentPresenter: connectToTrackersWiFi() --> going to disconnect from current network...
I/WiFiConnectionManager: disconnect() success: true
D/ConnectDeviceFragmentPresenter: connectToTrackersWiFi() --> in order to enableNetwork for networkId: 141
I/WiFiConnectionManager: enableNetwork() --> netId: 141 | success: true
D/WiFiConnectionManager: isConnectedToWiFi() --> NOT connected to any Wi-Fi (networkId == -1)
D/WiFiConnectionManager: isConnectedToTrackerHotSpot() --> NOT connected to any Wi-Fi!
D/WiFiConnectionManager: isConnected() --> networkInfo.getTypeName() = MOBILE
I/MainFragmentPresenter: connectivityBroadcastReceiver.onReceive() --> Assuming we have internet...
D/WiFiConnectionManager: isConnectedToWiFi() --> NOT connected to any Wi-Fi (networkId == -1)
D/WiFiConnectionManager: isConnectedToTrackerHotSpot() --> NOT connected to any Wi-Fi!
D/ConnectDeviceFragmentPresenter: connectivityBroadcastReceiver.onReceive() --> fragment.updateUiFailedToConnect()
D/ConnectDeviceFragment: updateUiFailedToConnect() --> creating but not showing yet (status might still change)
D/WiFiConnectionManager: isConnectedToWiFi() --> NOT connected to any Wi-Fi (networkId == -1)
D/WiFiConnectionManager: isConnectedToTrackerHotSpot() --> NOT connected to any Wi-Fi!
D/WiFiConnectionManager: isConnected() --> networkInfo.getTypeName() = MOBILE
I/MainFragmentPresenter: connectivityBroadcastReceiver.onReceive() --> Assuming we have internet...
D/WiFiConnectionManager: isConnectedToWiFi() --> NOT connected to any Wi-Fi (networkId == -1)
D/WiFiConnectionManager: isConnectedToTrackerHotSpot() --> NOT connected to any Wi-Fi!
D/ConnectDeviceFragmentPresenter: connectivityBroadcastReceiver.onReceive() --> SUPPRESSING UI update (since already done)
I/ConnectDeviceFragment: updateUiFailedToConnect() --> run() delayed by: 5000
我究竟做错了什么？我的代码工作正常的任何设备，也没有启用任何移动网络上...
编辑：
我可能已经找到了根本原因：
boolean openSocketConnection() {
if (isSocketReady()) {
Log.i(TAG, "openSocketConnection() --> isSocketReady() --> return true");
return true;
}
//FIXME: Timeout if Wi-Fi AND mobile network are active --> force open socket on Wi-Fi
try {
socket = new Socket(InetAddress.getByName(SERVER_IP), SERVER_PORT);
outputStream = new DataOutputStream(socket.getOutputStream());
inputStream = new DataInputStream(socket.getInputStream());
Log.i(TAG, "openSocketConnection() --> connection opened and input/output streams created!");
return true;
} catch (IOException e) {
Log.e(TAG, "openSocketConnection() --> IOException!", e);
return false;
}
}
因此，新的问题是：我怎么能打开Wi-Fi连接的插座上（尽管活动的网络将是移动网络）。由于Wi-Fi连接到我的嵌入式设备将永远不会有互联网，但我需要打开一个套接字通信...
任何帮助非常感谢！
我发现了一个解决方案，我可以以某种方式与生活。到底问题的根源是，Android为默认的网络上打开套接字，如果你不明确的告诉否则。而默认的网络显然是永远拥有互联网的一个（我学到了艰辛的道路）。
因此，这里是我的新的解决方案的中心部分：
private Socket getTrackerWiFiSocket() throws SocketException {
final Socket socket;
try {
Log.i(TAG, "getTrackerWiFiSocket() --> TRY getSocketFactory().createSocket()");
socket = getSocketFactory().createSocket(TRACKER_API_ADDRESS, TRACKER_API_PORT);
} catch (IOException e) {
Log.e(TAG, "getTrackerWiFiSocket() --> getSocketFactory().createSocket() produced IOException: ", e);
throw new SocketException(TAG + ".getTrackerWiFiSocket() --> create socket failed!");
}
Log.d(TAG, "getTrackerWiFiSocket() --> socket: " + socket);
return socket;
}
private SocketFactory getSocketFactory() throws SocketException {
if (SDK_INT < 21) {
Log.d(TAG, "getSocketFactory() --> SDK_INT is < 21 --> return SocketFactory.getDefault()");
return SocketFactory.getDefault();
}
/*
On API 21 and later, a socket that is NOT created with the Wi-Fi network's SocketFactory may try
to connect via another network --> we have to make sure that always the Wi-Fi network is chosen
*/
Network wifiNetwork = getWiFiNetwork();
// FIXME: Find a nicer approach
for (int i = 0; i < 10; i++) {
Log.d(TAG, "getSocketFactory() --> getWiFiNetwork() loop: " + i);
if (wifiNetwork == null) {
try {
Thread.sleep(500);
} catch (InterruptedException e) {
Log.w(TAG, "getSocketFactory() --> getWiFiNetwork() --> error during Thread.sleep");
}
wifiNetwork = getWiFiNetwork();
} else {
Log.i(TAG, "getSocketFactory() --> found Wi-Fi network socket!");
return wifiNetwork.getSocketFactory();
}
}
Log.e(TAG, "getSocketFactory() -> Could not find a suitable SocketFactory --> return default");
throw new SocketException(TAG + ".getSocketFactory() --> could not get a SocketFactory!");
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private Network getWiFiNetwork() {
for (Network network : connectivityManager.getAllNetworks()) {
NetworkInfo info = connectivityManager.getNetworkInfo(network);
// FIXME: Use another (non-deprecated) way to determine whether type is Wi-Fi
if (info != null && info.getType() == TYPE_WIFI) {
Log.d(TAG, "getWiFiNetwork() --> found network with info: " + info);
return network;
}
}
Log.w(TAG, "getWiFiNetwork() --> Could not find the Wi-Fi network!");
return null;
}
如果任何人有确保一个更好的方法，即有可用的Network对象从比我难看的循环与Thread.sleep()我听创建一个Socket ...