ANDROID Show a dialog when the Internet/GPS loses connectivity or is not connected

Question

[EDITED]

I want to show a Splash Screen / dialog when the Internet or GPS is down or not connected so the user can\'t use the app until the connection is good again.

Answer 1

you can create a Service class and use TimerTask with Timer and give it a duration to start over, with this you can start your service from the receiver that you already have and make it (receiver) listen to BOOT_COMPLETED with

<intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>

and specify a permission <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

and let your receiver call the service class -(or you can check your stuff there -(take into consideration the comments i made)) by implementing this in your onReceive

boolean isMyServiceRunning(Class<?> serviceClass, Context t) {
    ActivityManager manager = (ActivityManager) t.getSystemService(Context.ACTIVITY_SERVICE);
    for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
        if (serviceClass.getName().equals(service.service.getClassName())) {
            return true;
        }
    }
    return false;
}

and if it returns false start service using

Intent i = new Intent(context, MyService.class);
context.startService(i);

then in your service do this

public class MyService extends Service {
Timer timer; TimerTask task;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // TODO Auto-generated method stub

    timer = new Timer();
    task = new TimerTask() {  
      @Override                 
      public void run() { 
          // put here your code for checking 

          String status = NetworkUtil.getConnectivityStatusString(context);
          // i am having nesting problems so put this in a handler() ok
          Toast.makeText(context, status, Toast.LENGTH_LONG).show();
          if(status.equals("Not connected to Internet")) {
          Intent splashIntent = new Intent(context, SplashScreen.class);
          splashIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          context.startActivity(splashIntent);  
           }
        // handler() code should end here           
     };                             
    timer.schedule(task, 0, 3000);  // repeat every 3 seconds

    return START_STICKY;
  }
}

its getting long, to close your splash screen, you can pass an instance of your activity and make it close itself from the service, or bind to the service or use local broadcast manager

also my code closing tags might be wrong so correct them..

Answer 2

STEP 1: Open AndroidManifest.xml and add the broadcast receiver.

<receiver
        android:name=".Util.InternetConnectorReceiver"
        android:enabled="true">
        <intent-filter>
            <!-- Intent filters for broadcast receiver -->
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>`

STEP 2: create activity with dialog theme:

<activity
            android:name=".Activity.ActivityDialogInternet"
            android:theme="@style/AppTheme.Dark.Dialog"></activity>

STEP 3: Make a BroadcastReceiver Class named InternetConnectorReceiver

public class InternetConnectorReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    if (intent.getAction().equalsIgnoreCase(Intent.ACTION_BOOT_COMPLETED) ||
            intent.getAction().equalsIgnoreCase("android.net.conn.CONNECTIVITY_CHANGE")) {
        Intent checkIntent = new Intent(context, ConnectivityCheck.class);
        context.startService(checkIntent);
    }
}}

STEP 4: Make another service class named ConnectivityCheck :

public class ConnectivityCheck extends Service {

@Override
public void onCreate() {
    super.onCreate();
    if (!checkConnection()) {
        Toast.makeText(context, "off", Toast.LENGTH_LONG).show();
        Intent dialogIntent = new Intent(this, ActivityDialogInternet.class);
        dialogIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(dialogIntent);
    }
    stopSelf();
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

private boolean checkConnection() {
    Log.i("wudfuyf", "checking started!!!!!!!!!!!!!!!!!!");
    ConnectivityManager cm =
            (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    return activeNetwork != null &&
            activeNetwork.isConnectedOrConnecting();

}}

STEP 5: create a activity called ActivityDialogInternet

public class ActivityDialogInternet extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dialog_internet);
}}

STEP 6: When internet connection is turned off ActivityDialogInternet called and show the dialog:

Answer 3

Try below solution

STEP 1:

Make a Java Class named NetworkStatus

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetworkStatus 
{
    Context context;

    public NetworkStatus(Context context) 
    {
        this.context = context;
    }

    public boolean isNetworkOnline() 
    {
        boolean status = false;

        try
        {
            ConnectivityManager cm = (ConnectivityManager) 
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);

            NetworkInfo netInfo = cm.getNetworkInfo(0);

            if (netInfo != null && netInfo.getState() == NetworkInfo.State.CONNECTED) 
            {
                status = true;
            } 
            else 
            {
                netInfo = cm.getNetworkInfo(1);

                if (netInfo != null && netInfo.getState() == NetworkInfo.State.CONNECTED) 
                {
                    status = true;
                }
            }
        } 
        catch (Exception e) 
        {
            e.printStackTrace();

            return false;
        }

        return status;
    }

}

STEP 2:

Make another Class named AlertDialogManager

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.provider.Settings;
import com.lmkt.wfm.R;
import com.lmkt.wfm.activities.ActivityMainScreen;

public class AlertDialogManager 
{
    Context context;

    public AlertDialogManager(Context context) 
    {
        this.context = context;
    }

    public void showAlertDialog(String title, final String message, final Boolean status) 
    {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);

        alertDialog.setTitle(title);

        alertDialog.setMessage(message);

        if(status != null)
        {
            alertDialog.setIcon((status) ? R.drawable.success : R.drawable.fail);
        }

        alertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener() 
        {
            public void onClick(DialogInterface dialog, int which) 
            {   
                if(message.contains("You do not have Internet Connection"))
                {
                      ((Activity) context).finish();
                }

                dialog.dismiss();
            }
        });

        alertDialog.show();
    }
}

STEP 3: Usage from your Splash Activity:

AlertDialogManager alert;

NetworkStatus ns;

ns = new NetworkStatus(context);

if(!(ns.isNetworkOnline()))
        {
            alert = new AlertDialogManager(context);

            alert.showAlertDialog("Internet Connection!", "You do not have Internet Connection. "
                    + "Please connect to the "
                    + "Internet to sync Data From Server...", false);
        }