在关注此 guide 之后,我已经为此工作了几天在线的。我正在使用目标 API 30(在使用 Android 11 的设备上构建)。尝试使用 networkCapabilities
获取 Wifi SSID这一直返回 null 而贬值的 wifiManager.connectionInfo.ssid
返回正确的 SSID。任何想法我做错了什么?我知道这需要更改 API 31 以包含 FLAG_INCLUDE_LOCATION_INFO
但我相信这应该适用于 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)
}
}
Gradle 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
最佳答案
创建您的 NetworkCallback
时对象,尝试传递给构造函数FLAG_INCLUDE_LOCATION_INFO
像这样:
object : ConnectivityManager.NetworkCallback(FLAG_INCLUDE_LOCATION_INFO) { /* your code */ }
这样我们就告诉我们想要接收一些关于网络的敏感数据,但遗憾的是它只能在 API 级别 31 或更高级别上工作。更多信息 here
关于android - WifiInfo 返回 null,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/71233591/