WifiInfo返回空
WifiInfo返回空
提问于 2022-02-23 08:32:45
在关注这个指南之后，我已经做了几天了。我使用的是目标API 30 (构建在使用Android 11的设备上)。尝试使用networkCapabilities获取Wifi，这将继续返回null，而折旧后的wifiManager.connectionInfo.ssid则返回正确的SSID。你知道我做错了什么吗？我知道这将需要修改API 31以包含FLAG_INCLUDE_LOCATION_INFO，但我认为这应该适用于API 30。有什么想法吗？
import android.content.Context
import android.net.ConnectivityManager
import android.net.Network
import android.net.NetworkCapabilities
import android.net.NetworkRequest
import android.net.wifi.WifiInfo
import android.net.wifi.WifiManager
import android.util.Log
import androidx.lifecycle.LiveData
private const val TAG = "NetworkStatus"
enum class NetworkStatus {
UNAVAILABLE,
CONNECTED_TO_XXXX,
CONNECTED_TO_OTHER,
CONNECTION_LOST
}
class NetworkStatusHelper(private val context: Context) : LiveData<Pair<NetworkStatus, String>>() {
private lateinit var connectivityManagerCallback: ConnectivityManager.NetworkCallback
var connectivityManager: ConnectivityManager =
context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
val wifiManager =
context.getSystemService(Context.WIFI_SERVICE) as WifiManager
private fun getConnectivityManagerCallback() = object : ConnectivityManager.NetworkCallback() {
override fun onUnavailable() {
super.onUnavailable()
announceStatus(Pair(NetworkStatus.UNAVAILABLE, ""))
}
override fun onAvailable(network: Network) {
super.onAvailable(network)
}
override fun onCapabilitiesChanged(
network: Network,
networkCapabilities: NetworkCapabilities
) {
super.onCapabilitiesChanged(network, networkCapabilities)
Log.d(TAG, "onCapabilitiesChanged: transport info = ${connectivityManager.getNetworkCapabilities(connectivityManager.activeNetwork)?.transportInfo}")
try {
val wifiInfo = networkCapabilities.transportInfo as WifiInfo
Log.d(TAG, "onCapabilitiesChanged: wifi SSID ${wifiInfo}")
if (wifiInfo.ssid.contains("XXXX-")) {
announceStatus(Pair(NetworkStatus.CONNECTED_TO_XXXX, wifiInfo.ssid))
} else {
announceStatus(Pair(NetworkStatus.CONNECTED_TO_OTHER, wifiInfo.ssid))
}
}
catch (e: Exception) {
Log.d(TAG, "onCapabilitiesChanged: exception = $e")
}
try {
Log.d(TAG, "onCapabilitiesChanged: ${wifiManager.connectionInfo.ssid}")
} catch (e: Exception) {
Log.d(TAG, "onAvailable: exception = $e")
}
}
override fun onLost(network: Network) {
super.onLost(network)
announceStatus(Pair(NetworkStatus.CONNECTION_LOST, ""))
}
}
fun announceStatus(networkResposePair: Pair<NetworkStatus, String>) {
postValue(networkResposePair)
}
override fun onActive() {
super.onActive()
connectivityManagerCallback = getConnectivityManagerCallback()
val networkRequest = NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
.build()
connectivityManager.registerNetworkCallback(networkRequest, connectivityManagerCallback)
}
override fun onInactive() {
super.onInactive()
connectivityManager.unregisterNetworkCallback(connectivityManagerCallback)
}
}级中的权限：
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>SDK版本
compileSdkVersion 31
buildToolsVersion "30.0.3"
minSdkVersion 30
targetSdkVersion 31回答 1
Stack Overflow用户
发布于 2022-03-02 08:57:40
在创建NetworkCallback对象时，尝试传递到构造函数FLAG_INCLUDE_LOCATION_INFO，如下所示：
object : ConnectivityManager.NetworkCallback(FLAG_INCLUDE_LOCATION_INFO) { /* your code */ }通过这种方式，我们知道我们希望接收一些有关网络的敏感数据，但是它只能在API 31级和更高级别上使用。
更多信息这里
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/71233591
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