我不明白为什么onAvailable会在随机时刻被多次调用,文档说明它可能因网络状态改变而被调用多次,但是onAvailable的网络对象参数的属性始终相同。我甚至比较了哈希码,它们都相同......
这个问题出现在我的LG棒棒糖设备上。
Android文档(https://developer.android.com/reference/android/net/ConnectivityManager.NetworkCallback):
onAvailable API 21 引入 当框架连接并声明新网络可供使用时调用。如果满足请求的网络发生更改,则可能多次调用此回调。
编辑:我已经实现了回调中的其他方法来检查是否触发了其他方法(onLosing、onUnavailable、onCapabilitiesChanged、onLinkPropertiesChanged),但是没有任何一个方法被调用。
我有自己的NetworkManager,在其中添加了以下代码:
public void initialize(Context context) {
connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
setState();
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
final NetworkRequest networkRequest = new NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
.addTransportType(NetworkCapabilities.TRANSPORT_WIFI).build();
connectivityManager.registerNetworkCallback(networkRequest, new ConnectivityManager.NetworkCallback() {
@Override
public void onAvailable(final Network network) {
super.onAvailable(network);
NetworkInfo networkInfo = connectivityManager.getNetworkInfo(network);
Log.d(TAG,"Network is Available. Network Info: " + networkInfo);
notifyObservers();
}
@Override
public void onLost(final Network network) {
super.onLost(network);
notifyObservers();
}
});
} else {
context.registerReceiver(new NetworkChangeReceiver(), new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}
}
日志:
Network is Available. Network Info: [type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "company_guest", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false]
Network is Available. Network Info: [type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "company_guest", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false]
Network is Available. Network Info: [type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "company_guest", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false]
Network is Available. Network Info: [type: WIFI[], state: CONNECTED/CONNECTED, reason: (unspecified), extra: "company_guest", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false]
...