Sweet alert in an AsyncTask Android -


i'm trying put sweet alert of https://github.com/pedant/sweet-alert-dialog library , works perfect, not in asynctask.

my onpostexcute:

protected void onpostexecute(string result) {          super.onpostexecute(result);         if(!pattern.compile("0").matcher(msj).find())         {             toast.maketext(ctx, "¡ya tienes una reserva para este viaje!", toast.length_short).show();         }else if(pattern.compile("200").matcher(msj).find()) {             sweetalertdialog swt = new sweetalertdialog(ctx, sweetalertdialog.warning_type)                     .settitletext("todas las plazas ocupadas")                     .setcontenttext("¿desea entrar en la lista de espera? será avisado en cuanto haya una plaza")             .setcanceltext("no")             .setconfirmtext("si")             .showcancelbutton(true)             .setcancelclicklistener(new sweetalertdialog.onsweetclicklistener() {                 @override                 public void onclick(sweetalertdialog sdialog) {                     // reuse previous dialog instance, keep widget user state, reset them if need                     sdialog.cancel();                     toast.maketext(ctx, "reserva no realizada", toast.length_short).show();                  }             })             .setconfirmclicklistener(new sweetalertdialog.onsweetclicklistener() {                 @override                 public void onclick(sweetalertdialog sdialog) {                 sdialog.cancel();                 }             });     swt.show();  }

ctx context of class execute asyctask , send parameter.

and error log:

e/androidruntime﹕ fatal exception: main     process: ********, pid: 6563     android.view.windowmanager$badtokenexception: unable add window -- token null not application             @ android.view.viewrootimpl.setview(viewrootimpl.java:566)             @ android.view.windowmanagerglobal.addview(windowmanagerglobal.java:272)             @ android.view.windowmanagerimpl.addview(windowmanagerimpl.java:69)             @ android.app.dialog.show(dialog.java:298)             @ *************.registerapp.onpostexecute(registerapp.java:175)             @ *************.registerapp.onpostexecute(registerapp.java:40)             @ android.os.asynctask.finish(asynctask.java:632)             @ android.os.asynctask.access$600(asynctask.java:177)             @ android.os.asynctask$internalhandler.handlemessage(asynctask.java:645)             @ android.os.handler.dispatchmessage(handler.java:102)             @ android.os.looper.loop(looper.java:135)             @ android.app.activitythread.main(activitythread.java:5221)             @ java.lang.reflect.method.invoke(native method)             @ java.lang.reflect.method.invoke(method.java:372)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:899)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:694)

ctx assignment:

new registerapp(dialogreserva.this, gcm, getappversion(getapplicationcontext()), string.valueof(getintent().getintextra("idviaje", 0)), userinput.gettext().tostring()).execute();

registerapp constructor

public class registerapp extends asynctask<void, void, string> {       private static final string tag = "gcmrelated";     context ctx;     string id_viaje;     string msj;     string tlf;     googlecloudmessaging gcm;     private int appversion;      public registerapp(context ctx, googlecloudmessaging gcm, int appversion, string id_viaje, string tlf){         this.ctx = ctx;         this.gcm = gcm;         this.id_viaje=id_viaje;         this.tlf=tlf;         this.appversion = appversion;     }

it looks activity context might null, possibly due activity being destroyed.

try using getapplicationcontext() instead of dialogreserva.this ctx when execute asynctask:

new registerapp((getapplicationcontext(), gcm, getappversion(getapplicationcontext()), string.valueof(getintent().getintextra("idviaje", 0)), userinput.gettext().tostring()).execute();

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