ConnectivityManager.CONNECTIVITY_ACTION被否决
ConnectivityManager.CONNECTIVITY_ACTION被否决
提问于 2016-04-05 09:12:02
在Android中，官方网站上提到“针对Android的应用程序不接收CONNECTIVITY_ACTION广播”。同时也提到了JobScheduler可以作为一种替代方案。但是JobScheduler并没有提供与CONNECTIVITY_ACTION广播完全相同的行为。
在我的Android应用程序中，我使用这个广播来了解设备的网络状态。我想知道在CONNECTING广播的帮助下，这个状态是CONNECTED还是CONNECTIVITY_ACTION，它最适合我的需求。
现在它已被废弃，有谁能建议我获得当前网络状态的替代方法吗？
回答 15
Stack Overflow用户
回答已采纳
发布于 2016-04-06 10:05:10
不推荐的是后台应用程序接收网络连接状态更改的能力。
正如大卫·瓦赛尔所说，如果应用程序组件被实例化(而不是销毁)，并且您有以编程方式注册接收方及其上下文，而不是在清单中这样做，您仍然可以得到连接更改的通知。
或者您可以使用NetworkCallback代替。特别是，对于连接状态的更改，您需要重写onAvailable。
让我快速起草一个片段：
public class ConnectionStateMonitor extends NetworkCallback {
final NetworkRequest networkRequest;
public ConnectionStateMonitor() {
networkRequest = new NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
.addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
.build();
}
public void enable(Context context) {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
connectivityManager.registerNetworkCallback(networkRequest, this);
}
// Likewise, you can have a disable method that simply calls ConnectivityManager.unregisterNetworkCallback(NetworkCallback) too.
@Override
public void onAvailable(Network network) {
// Do what you need to do here
}
}Stack Overflow用户
发布于 2018-10-09 10:13:49
我将更新Sayem's的答案，为修复棉问题，它显示给我。
class ConnectionLiveData(val context: Context) : LiveData<Boolean>() {
private var connectivityManager: ConnectivityManager = context.getSystemService(CONNECTIVITY_SERVICE) as ConnectivityManager
private lateinit var connectivityManagerCallback: ConnectivityManager.NetworkCallback
private val networkRequestBuilder: NetworkRequest.Builder = NetworkRequest.Builder()
.addTransportType(android.net.NetworkCapabilities.TRANSPORT_CELLULAR)
.addTransportType(android.net.NetworkCapabilities.TRANSPORT_WIFI)
override fun onActive() {
super.onActive()
updateConnection()
when {
Build.VERSION.SDK_INT >= Build.VERSION_CODES.N -> connectivityManager.registerDefaultNetworkCallback(getConnectivityMarshmallowManagerCallback())
Build.VERSION.SDK_INT >= Build.VERSION_CODES.M -> marshmallowNetworkAvailableRequest()
Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP -> lollipopNetworkAvailableRequest()
else -> {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
context.registerReceiver(networkReceiver, IntentFilter("android.net.conn.CONNECTIVITY_CHANGE")) // android.net.ConnectivityManager.CONNECTIVITY_ACTION
}
}
}
}
override fun onInactive() {
super.onInactive()
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
connectivityManager.unregisterNetworkCallback(connectivityManagerCallback)
} else {
context.unregisterReceiver(networkReceiver)
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private fun lollipopNetworkAvailableRequest() {
connectivityManager.registerNetworkCallback(networkRequestBuilder.build(), getConnectivityLollipopManagerCallback())
}
@TargetApi(Build.VERSION_CODES.M)
private fun marshmallowNetworkAvailableRequest() {
connectivityManager.registerNetworkCallback(networkRequestBuilder.build(), getConnectivityMarshmallowManagerCallback())
}
private fun getConnectivityLollipopManagerCallback(): ConnectivityManager.NetworkCallback {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
connectivityManagerCallback = object : ConnectivityManager.NetworkCallback() {
override fun onAvailable(network: Network?) {
postValue(true)
}
override fun onLost(network: Network?) {
postValue(false)
}
}
return connectivityManagerCallback
} else {
throw IllegalAccessError("Accessing wrong API version")
}
}
private fun getConnectivityMarshmallowManagerCallback(): ConnectivityManager.NetworkCallback {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
connectivityManagerCallback = object : ConnectivityManager.NetworkCallback() {
override fun onCapabilitiesChanged(network: Network?, networkCapabilities: NetworkCapabilities?) {
networkCapabilities?.let { capabilities ->
if (capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) && capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)) {
postValue(true)
}
}
}
override fun onLost(network: Network?) {
postValue(false)
}
}
return connectivityManagerCallback
} else {
throw IllegalAccessError("Accessing wrong API version")
}
}
private val networkReceiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
updateConnection()
}
}
private fun updateConnection() {
val activeNetwork: NetworkInfo? = connectivityManager.activeNetworkInfo
postValue(activeNetwork?.isConnected == true)
}
}同样的用法：
val connectionLiveData = ConnectionLiveData(context)
connectionLiveData.observe(this, Observer { isConnected ->
isConnected?.let {
// do job
}
})顺便说一句谢谢sayem的解决方案。
Stack Overflow用户
发布于 2016-04-06 10:12:10
Android N的文档声明：
针对Android的应用程序不接收CONNECTIVITY_ACTION广播，即使它们有清单条目请求通知这些事件。在前台运行的应用程序仍然可以在主线程上侦听CONNECTIVITY_CHANGE，如果它们请求BroadcastReceiver通知的话。
这意味着，如果您的应用程序运行在前台，您仍然可以注册一个BroadcastReceiver，以便检测网络连接的变化。
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原文链接：
https://stackoverflow.com/questions/36421930
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