android - Prevent multiple instances in webview activity -

i have webview activity, in it's url updated notification service. when notification clicked new activity created everytime load changed url. can prevented adding android:launchmode="singletask" in manifiest.

if new activity created every time when notification clicked leads me change content perfectly. want avoid creating new activity(or maybe view created idk?) every time notification clicked. if add android:launchmode="singletask"in manifest, gives me side-effect, i.e if notification arrived on existing opened webview activity not redirect changed url.

pending notification intent:

  notificationmanager mnotificationmanager = (notificationmanager) getsystemservice(context.notification_service);     if (ismessage) {         intent intent = new intent(this, miscdisplay.class);          intent.putextra("start_url", url);         intent.setaction("notification_url_action");         pendingintent resultpendingintent = pendingintent.getactivity(getapplicationcontext(), 1, intent, pendingintent.flag_update_current);         mbuilder.setcontentintent(resultpendingintent);         mbuilder.extend(new wearableextender().addaction(message));         mbuilder.setongoing(false);         mbuilder.setsmallicon(r.mipmap.ic_launcher);         mbuilder.setonlyalertonce(true);         notification note = mbuilder.build();         mnotificationmanager.notify(1, note);      } else {         mbuilder.setsmallicon(r.mipmap.ic_launcher);         intent intent = new intent(this, miscdisplay.class);         intent.putextra("start_url", url);         intent.setaction("notification_url_action");         taskstackbuilder stackbuilder = taskstackbuilder.create(this);         stackbuilder.addparentstack(miscdisplay.class);         stackbuilder.addnextintent(intent);         pendingintent resultpendingintent = pendingintent.getactivity(getapplicationcontext(), 0, intent, pendingintent.flag_update_current);         mbuilder.setcontentintent(resultpendingintent);         mbuilder.extend(new notificationcompat.wearableextender().addaction(action));         mbuilder.setongoing(false);         notification note = mbuilder.build();         mnotificationmanager.notify(0, note); 

what want?

i want avoid creating new activity each time when new notification clicked.

please help! thank you.

intent activityintent = new intent(context, mainactivity.class);activityintent.addflags(intent.flag_activity_new_task                 | intent.flag_activity_clear_top                 | intent.flag_activity_single_top); context.startactivity(activityintent); 

use flags before calling activity solution two: in manifest:

 <application         android:allowbackup="true"         android:label="@string/app_name"         android:name=".al"  public class al extends application {     public static boolean isactivityrunnig=false;  @override     public void oncreate()  {         super.oncreate(); } 

in activity:

@override     protected void onresume() {         super.onresume();         al.isactivityrunnig= true;     } @override     protected void onpause() {         super.onpause();         al.isactivityrunnig= false;      } 

and when click on notification can check falg:

if(!al.isactivityrunnig)    startactivity(new intent(context,youractivity.class));