this android activity is not working -

this code not working since have added showpopup() method, couldn't figure out reason. whats problem in code?

package com.example.healthcity.activities;  import org.taptwo.android.widget.circleflowindicator; import org.taptwo.android.widget.viewflow;  import com.example.healthcity.r; import com.example.healthcity.dataobjs.demodataadapter;  import android.app.activity; import android.content.context; import android.os.bundle; import android.os.handler; import android.view.gravity; import android.view.layoutinflater; import android.view.view; import android.widget.framelayout; import android.widget.linearlayout; import android.widget.popupwindow;  public class demoviewflowactivity extends activity {      private viewflow viewflow;      /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.bf_home_screen);         // viewflow = (viewflow) findviewbyid(r.id.viewflow);         // viewflow.setadapter(new demodataadapter(this));         // circleflowindicator indic = (circleflowindicator)         // findviewbyid(r.id.viewflowindic);         // viewflow.setflowindicator(indic);     }      @override     protected void onstart() {         super.onstart();         showpopup(demoviewflowactivity.this);     }      // method displays popup.     private void showpopup(activity context) {         int popupwidth = 200;         int popupheight = 150;          // inflate popup_layout.xml         framelayout viewgroup = (framelayout) context.findviewbyid(r.id.popup);         layoutinflater layoutinflater = (layoutinflater) context                 .getsystemservice(context.layout_inflater_service);         view layout = layoutinflater.inflate(r.layout.circle_layout, viewgroup);          // creating popupwindow         popupwindow popup = new popupwindow(context);         popup.setcontentview(layout);         popup.setwidth(popupwidth);         popup.setheight(popupheight);         popup.setfocusable(true);          // offset align popup bit right, , bit down,         // relative button's position.         int offset_x = 30;         int offset_y = 30;          // displaying popup @ specified location, + offsets.         popup.showatlocation(layout, gravity.no_gravity, 50, 50);           viewflow = (viewflow) findviewbyid(r.id.viewflow);          viewflow.setadapter(new demodataadapter(this));          circleflowindicator indic = (circleflowindicator)          findviewbyid(r.id.viewflowindic);          viewflow.setflowindicator(indic);          // getting reference close button, , close popup when         // clicked.         // button close = (button) layout.findviewbyid(r.id.close);         // close.setonclicklistener(new onclicklistener() {         //         // @override         // public void onclick(view v) {         // popup.dismiss();         // }         // });     } } 

here part of logcat error seem appear:

    07-23 23:34:25.960: w/dalvikvm(4048): threadid=1: thread exiting uncaught exception (group=0x40a71930) 07-23 23:34:25.969: e/androidruntime(4048): fatal exception: main 07-23 23:34:25.969: e/androidruntime(4048): java.lang.runtimeexception: unable start activity componentinfo{com.example.healthcity/com.example.healthcity.activities.demoviewflowactivity}: android.view.windowmanager$badtokenexception: unable add window -- token null not valid; activity running? 07-23 23:34:25.969: e/androidruntime(4048):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2180) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2230) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.app.activitythread.access$600(activitythread.java:141) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.app.activitythread$h.handlemessage(activitythread.java:1234) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.os.handler.dispatchmessage(handler.java:99) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.os.looper.loop(looper.java:137) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.app.activitythread.main(activitythread.java:5041) 07-23 23:34:25.969: e/androidruntime(4048):     @ java.lang.reflect.method.invokenative(native method) 07-23 23:34:25.969: e/androidruntime(4048):     @ java.lang.reflect.method.invoke(method.java:511) 07-23 23:34:25.969: e/androidruntime(4048):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 07-23 23:34:25.969: e/androidruntime(4048):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 07-23 23:34:25.969: e/androidruntime(4048):     @ dalvik.system.nativestart.main(native method) 07-23 23:34:25.969: e/androidruntime(4048): caused by: android.view.windowmanager$badtokenexception: unable add window -- token null not valid; activity running? 07-23 23:34:25.969: e/androidruntime(4048):     @ android.view.viewrootimpl.setview(viewrootimpl.java:567) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.view.windowmanagerglobal.addview(windowmanagerglobal.java:246) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.view.windowmanagerimpl.addview(windowmanagerimpl.java:69) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.widget.popupwindow.invokepopup(popupwindow.java:993) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.widget.popupwindow.showatlocation(popupwindow.java:847) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.widget.popupwindow.showatlocation(popupwindow.java:811) 07-23 23:34:25.969: e/androidruntime(4048):     @ com.example.healthcity.activities.demoviewflowactivity.showpopup(demoviewflowactivity.java:81) 07-23 23:34:25.969: e/androidruntime(4048):     @ com.example.healthcity.activities.demoviewflowactivity.onstart(demoviewflowactivity.java:54) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.app.instrumentation.callactivityonstart(instrumentation.java:1164) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.app.activity.performstart(activity.java:5114) 07-23 23:34:25.969: e/androidruntime(4048):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2153) 

change code this:

replace call showpopup(this) with:

new handler().postdelayed(new runnable() {      public void run() {         showpopup(demoviewflowactivity.this);     } }, 100l); 

edit 1:

usually, 100 milliseconds delay works wonders in kind of situation. but, seeing getting exception after using 1 second delay, tried following:

i made simple layout file(say, r.layout.simple_layout) containing linearlayout. not matter layout is. gave id(say, @+id/llempty). now, in oncreate(bundle), set layout using setcontentview(r.layout.simple_layout). and, in onstart(), put following:

@override protected void onstart() {           super.onstart();      findviewbyid(r.id.llempty).post(new runnable() {          @override         public void run() {             // method creates , displays popup             showlist();         }       }); } 

how translate code:

your layout file r.layout.bf_home_screen contains relativelayout or linearlayout parent layout. give parent layout id using android:id="@+id/some_id". change onstart() method to:

@override protected void onstart() {           super.onstart();      // replace "some_id" id use in layout file     findviewbyid(r.id.some_id).post(new runnable() {          @override         public void run() {             showpopup(demoviewflowactivity.this);         }       }); }