ConnectivityManager.CONNECTIVITY_ACTION get network disconected from in API >= 14?

问题

I need to get the network from which device was disconnected.

Now I use:

NetworkInfo ni =intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);

And check:

ni.isConnected()

if this returns false ni - is the network from which the device was disconnected.

But ConnectivityManager.EXTRA_NETWORK_INFO is deprecated in API 14. Google says use getActiveNetworkInfo() to get network information. But getActiveNetworkInfo() always returns network with which the device is connected now (isConnected() must return true)!

How do I get the network info for the network the device disconnected from without using ConnectivityManager.EXTRA_NETWORK_INFO?

Sertorio Noronha, when I use getActiveNetworkInfo() I only get the network to which I am connected now! But I need to get the network from which I was disconnected.

ConnectivityManager cm = (ConnectivityManager)
    context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo n1 = cm.getActiveNetworkInfo();
Log.d("tets", String.format("%s: %s", n1.getTypeName(), n1.isConnected()));

When I disconnect from WI-FI and connect to 3G in log:

mobile: true
mobile: true

When I disconnect from 3G and connect to WI-FI in log:

WIFI: true
WIFI: true
WIFI: true

getActiveNetworkInfo returns only the network connected to now, but does not return the network from which I was disconnected.

If I use deprecated intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO) in log I see:

When I disconnect from WI-FI and connect to 3G:

WIFI: false
mobile: true

When I disconnect from 3G and connect to WI-FI:

mobile: false
WIFI: true

But I do not want to use deprecated api. How to use modern api to get network from which I was disconnected?

回答1:

You can use the following

ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
int networkType = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_TYPE);
boolean isWiFi = networkType == ConnectivityManager.TYPE_WIFI;
boolean isMobile = networkType == ConnectivityManager.TYPE_MOBILE;
NetworkInfo networkInfo = connectivityManager.getNetworkInfo(networkType);
boolean isConnected = networkInfo.isConnected();

if (isWiFi) {
    if (isConnected) {
        Log.i("APP_TAG", "Wi-Fi - CONNECTED");
    } else {
        Log.i("APP_TAG", "Wi-Fi - DISCONNECTED");
    }
} else if (isMobile) {
    if (isConnected) {
        Log.i("APP_TAG", "Mobile - CONNECTED");
    } else {
        Log.i("APP_TAG", "Mobile - DISCONNECTED");
    }
} else {
    if (isConnected) {
        Log.i("APP_TAG", networkInfo.getTypeName() + " - CONNECTED");
    } else {
        Log.i("APP_TAG", networkInfo.getTypeName() + " - DISCONNECTED");
    }
}

回答2:

You can get the instance of NetworkInfo through the Context.

ConnectivityManager connectivityManager = ((ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE));
NetworkInfo currentNetworkInfo = connectivityManager.getActiveNetworkInfo();

if(currentNetworkInfo != null && currentNetworkInfo.isConnected()){
   // Your logic goes in here
}

回答3:

Working non deprecated code

/**Receiver*/   

 public class NetworkStateReceiver extends BroadcastReceiver {

        /*
         * @see android.content.BroadcastReceiver#onReceive(android.content.Context,
         * android.content.Intent)
         */
        @Override
        public void onReceive(Context context, Intent intent) {
            ConnectivityManager connectivityManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
            int networkType = intent.getExtras().getInt(ConnectivityManager.EXTRA_NETWORK_TYPE);
            boolean isWiFi = networkType == ConnectivityManager.TYPE_WIFI;
            boolean isMobile = networkType == ConnectivityManager.TYPE_MOBILE;
            NetworkInfo networkInfo = connectivityManager.getNetworkInfo(networkType);
            boolean isConnected = networkInfo.isConnected();

            if (isWiFi) {
                if (isConnected) {
                    Log.i("APP_TAG", "Wi-Fi - CONNECTED");
                } else {
                    Log.i("APP_TAG", "Wi-Fi - DISCONNECTED");
                }
            } else if (isMobile) {
                if (isConnected) {
                    Log.i("APP_TAG", "Mobile - CONNECTED");
                } else {
                    Log.i("APP_TAG", "Mobile - DISCONNECTED");
                }
            } else {
                if (isConnected) {
                    Log.i("APP_TAG", networkInfo.getTypeName() + " - CONNECTED");
                } else {
                    Log.i("APP_TAG", networkInfo.getTypeName() + " - DISCONNECTED");
                }
            }
        }

    }

And in manifest

<!-- Receiver registration in manifest -->
     <receiver android:name="com.xxx.yyy.NetworkStateReceiver" >
                <intent-filter>
                    <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
                </intent-filter>
            </receiver>

and

<!-- Internet permission for network comunication -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

来源：https://stackoverflow.com/questions/13293220/connectivitymanager-connectivity-action-get-network-disconected-from-in-api-1

标签

android

networking

connectivity