How to show notification on internet connect?

Question

I have to show a notification when the device is connected to internet.
Do i need to run a service all the time for this?

Answer 1

ConnectivityReceiver.java

public class ConnectivityReceiver
    extends BroadcastReceiver {

public static ConnectivityReceiverListener connectivityReceiverListener;

public ConnectivityReceiver() {
    super();
}

@Override
public void onReceive(Context context, Intent arg1) {
    ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    boolean isConnected = activeNetwork != null
            && activeNetwork.isConnectedOrConnecting();

    if (connectivityReceiverListener != null) {
        connectivityReceiverListener.onNetworkConnectionChanged(isConnected);
    }
}

public static boolean isConnected() {
    ConnectivityManager
            cm = (ConnectivityManager) MyApplication.getInstance().getApplicationContext()
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    return activeNetwork != null
            && activeNetwork.isConnectedOrConnecting();
}


public interface ConnectivityReceiverListener {
    void onNetworkConnectionChanged(boolean isConnected);
}}

MyApplication.java

public class MyApplication extends Application {

private static MyApplication mInstance;

@Override
public void onCreate() {
    super.onCreate();

    mInstance = this;
}

public static synchronized MyApplication getInstance() {
    return mInstance;
}

public void setConnectivityListener(ConnectivityReceiver.ConnectivityReceiverListener listener) {
    ConnectivityReceiver.connectivityReceiverListener = listener;
}}

AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

<application
    android:name=".MyApplication"
    android:allowBackup="true"
    ...
<receiver
        android:name=".ConnectivityReceiver"
        android:enabled="true">
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
        </intent-filter>
    </receiver>
...
</application>

Activity.class

public class MainActivity extends AppCompatActivity
    implements ConnectivityReceiver.ConnectivityReceiverListener {
...
@Override
protected void onResume() {
    super.onResume();

    // register connection status listener
    MyApplication.getInstance().setConnectivityListener(this);
}
...
@Override
public void onNetworkConnectionChanged(boolean isConnected) {
if(isConnected){
Toast.makeText(context, "Internet Connected", Toast.LENGTH_SHORT).show();
}else{Toast.makeText(context, "Internet not Connected", Toast.LENGTH_SHORT).show();}   
}}

Answer 2

You need a broadcast receiver to receive network state changes then pass this data to service which is not a bound service and create a notification or you can create your notification in your broadcast receiver.

Answer 3

You don't have to run a service to check for connection changes.

You can register a broadcast receiver with the android.net.conn.CONNECTIVITY_CHANGE intent.

Note that

Apps targeting Android 7.0 (API level 24) and higher do not receive this broadcast if they declare the broadcast receiver in their manifest. Apps will still receive broadcasts if they register their BroadcastReceiver with Context.registerReceiver() and that context is still valid.

Link for more information: https://developer.android.com/reference/android/net/ConnectivityManager.html#CONNECTIVITY_ACTION

Similar question: https://stackoverflow.com/a/2295044/2174489