Java Android WifiInfo.getIpAddress在Nexus 5X和Android 6上返回0个Android

以下是我正在做的：

我注册了一个广播接收器，如下所示：

mConnectionChangeReceiver = new ConnectionChangeReceiver();
IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
mContext.registerReceiver(mConnectionChangeReceiver, filter, null, handler);

if (!mWifiManager.isWifiEnabled()) {
    mWifiManager.setWifiEnabled(true);
}
mWifiManager.enableNetwork(mCurrentNetworkId, true);

然后我会自动尝试连接到特定的WiFi。大概是这样的：

mConnectionChangeReceiver = new ConnectionChangeReceiver();
IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
filter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION);
filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
mContext.registerReceiver(mConnectionChangeReceiver, filter, null, handler);

if (!mWifiManager.isWifiEnabled()) {
    mWifiManager.setWifiEnabled(true);
}
mWifiManager.enableNetwork(mCurrentNetworkId, true);

我获得了预期的广播接收器事件。在

onReceive（）

内部，我检查SSID和

SuplicantState

。问题是当我尝试获取电话ip地址时

WifiInfo.getIpAddress

如果手机上的蜂窝网络已启用，则返回0；如果手机上的蜂窝网络已禁用，则返回0

请注意，如果设备在这两种情况下（有/没有蜂窝网络）都已连接到SSID，则这将起作用。为此，必须先关闭wifi，或者在运行代码之前将手机连接到另一个wifi

代码如下：

public void onReceive(Context context, Intent intent) {        
    WifiInfo wifiInfo = mWifiManager.getConnectionInfo();

    //..... Here's the code that compares SSID

    if (isConnectedToSSID() && (wifiInfo.getSupplicantState() == SupplicantState.COMPLETED) {    
        mIpAddress = NetworkHelper.getIpAddress(wifiInfo);   
    }
}

public static String getIpAddress(WifiInfo pWifiInfo) {
    int ipAddress = pWifiInfo.getIpAddress();
    if (ByteOrder.nativeOrder().equals(ByteOrder.LITTLE_ENDIAN)) {
        ipAddress = Integer.reverseBytes(ipAddress);
    }

    byte[] ipByteArray = BigInteger.valueOf(ipAddress).toByteArray();
    String ipAddressString = null;
    try {
        ipAddressString = InetAddress.getByAddress(ipByteArray).getHostAddress();
    } catch (UnknownHostException ex) {
        ex.printStackTrace();
    }
    return ipAddressString;
}

你知道为什么会这样吗