1.Manifest Code :
<application
...
<service android:name=".MyService" />
</application>
MyService.java
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;
public class MyService extends Service {
static final String CONNECTIVITY_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
NotificationManager manager ;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Let it continue running until it is stopped.
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
IntentFilter filter = new IntentFilter();
filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (CONNECTIVITY_CHANGE_ACTION.equals(action)) {
//check internet connection
if (!ConnectionHelper.isConnectedOrConnecting(context)) {
if (context != null) {
boolean show = false;
if (ConnectionHelper.lastNoConnectionTs == -1) {//first time
show = true;
ConnectionHelper.lastNoConnectionTs = System.currentTimeMillis();
} else {
if (System.currentTimeMillis() - ConnectionHelper.lastNoConnectionTs > 1000) {
show = true;
ConnectionHelper.lastNoConnectionTs = System.currentTimeMillis();
}
}
if (show && ConnectionHelper.isOnline) {
ConnectionHelper.isOnline = false;
Log.i("NETWORK123","Connection lost");
//manager.cancelAll();
}
}
} else {
Log.i("NETWORK123","Connected");
showNotifications("APP" , "It is working");
// Perform your actions here
ConnectionHelper.isOnline = true;
}
}
}
};
registerReceiver(receiver,filter);
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();
}
}
ConnectionHelper.java
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class ConnectionHelper {
public static long lastNoConnectionTs = -1;
public static boolean isOnline = true;
public static boolean isConnected(Context context) {
ConnectivityManager cm =(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null && activeNetwork.isConnected();
}
public static boolean isConnectedOrConnecting(Context context) {
ConnectivityManager cm =(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
}
}
Your Activity Code
startService(new Intent(getBaseContext(), MyService.class));
We can easily do it by using a Service and a Broadcast Receiver simultaneously to get the output as you wish. This will work always i.e when app is running, app is minimized or when app is even removed from minimized apps.
1.Manifest Code :
<application
...
<service android:name=".MyService" />
</application>
2.MyService.java
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;
public class MyService extends Service {
static final String CONNECTIVITY_CHANGE_ACTION = "android.net.conn.CONNECTIVITY_CHANGE";
NotificationManager manager ;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// Let it continue running until it is stopped.
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
IntentFilter filter = new IntentFilter();
filter.addAction("android.net.conn.CONNECTIVITY_CHANGE");
BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (CONNECTIVITY_CHANGE_ACTION.equals(action)) {
//check internet connection
if (!ConnectionHelper.isConnectedOrConnecting(context)) {
if (context != null) {
boolean show = false;
if (ConnectionHelper.lastNoConnectionTs == -1) {//first time
show = true;
ConnectionHelper.lastNoConnectionTs = System.currentTimeMillis();
} else {
if (System.currentTimeMillis() - ConnectionHelper.lastNoConnectionTs > 1000) {
show = true;
ConnectionHelper.lastNoConnectionTs = System.currentTimeMillis();
}
}
if (show && ConnectionHelper.isOnline) {
ConnectionHelper.isOnline = false;
Log.i("NETWORK123","Connection lost");
//manager.cancelAll();
}
}
} else {
Log.i("NETWORK123","Connected");
showNotifications("APP" , "It is working");
// Perform your actions here
ConnectionHelper.isOnline = true;
}
}
}
};
registerReceiver(receiver,filter);
return START_STICKY;
}
@Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();
}
}
3.ConnectionHelper.java
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
public class ConnectionHelper {
public static long lastNoConnectionTs = -1;
public static boolean isOnline = true;
public static boolean isConnected(Context context) {
ConnectivityManager cm =(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null && activeNetwork.isConnected();
}
public static boolean isConnectedOrConnecting(Context context) {
ConnectivityManager cm =(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
}
}
4.Your Activity Code
startService(new Intent(getBaseContext(), MyService.class));
With this code, you will be able to check the connectivity when the app is onStart, On pause and even when the app is destroyed
