android - Alert Dialog error -

i'm trying watch alertdialog 2 options: cámara , galería. when run app closes message "unfortunately, mapalugares has closed".

the logcat message is:

08-15 20:37:02.960: e/androidruntime(5377): fatal exception: main 08-15 20:37:02.960: e/androidruntime(5377):   android.view.windowmanager$badtokenexception: unable add window -- token null    not application 08-15 20:37:02.960: e/androidruntime(5377):         @   android.view.viewrootimpl.setview(viewrootimpl.java:521) 08-15 20:37:02.960: e/androidruntime(5377):     @  android.view.windowmanagerimpl.addview(windowmanagerimpl.java:301) 08-15 20:37:02.960: e/androidruntime(5377):     @  android.view.windowmanagerimpl.addview(windowmanagerimpl.java:215) 08-15 20:37:02.960: e/androidruntime(5377):     @  android.view.windowmanagerimpl$compatmodewrapper.addview(windowmanagerimpl.java:140) 08-15 20:37:02.960: e/androidruntime(5377):     @   android.app.dialog.show(dialog.java:289) 08-15 20:37:02.960: e/androidruntime(5377):     @  com.app.mapa.insertarlugar$1.onclick(insertarlugar.java:62) 08-15 20:37:02.960: e/androidruntime(5377):     @   android.view.view.performclick(view.java:3521) 08-15 20:37:02.960: e/androidruntime(5377):     @  android.view.view$performclick.run(view.java:14185) 08-15 20:37:02.960: e/androidruntime(5377):     @  android.os.handler.handlecallback(handler.java:605) 08-15 20:37:02.960: e/androidruntime(5377):     @  android.os.handler.dispatchmessage(handler.java:92) 08-15 20:37:02.960: e/androidruntime(5377):     @  android.os.looper.loop(looper.java:137) 08-15 20:37:02.960: e/androidruntime(5377):     @  android.app.activitythread.main(activitythread.java:4464) 08-15 20:37:02.960: e/androidruntime(5377):     @  java.lang.reflect.method.invokenative(native method) 08-15 20:37:02.960: e/androidruntime(5377):     @  java.lang.reflect.method.invoke(method.java:511) 08-15 20:37:02.960: e/androidruntime(5377):     @  com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:822) 08-15 20:37:02.960: e/androidruntime(5377):     @  com.android.internal.os.zygoteinit.main(zygoteinit.java:589) 08-15 20:37:02.960: e/androidruntime(5377):     @  dalvik.system.nativestart.main(native method) 08-15 20:37:05.210: i/activitythread(5573): pub com.app.mapa.mcprovider:    com.app.mapa.mcprovider 08-15 20:37:05.570: d/memalloc(5573): /dev/pmem: mapped buffer base:0x5127b000  size:2826240 offset:1290240 fd:51 08-15 20:37:05.620: e/adreno200-es20(5573): <qgl2drvapi_gluseprogram:1318>: **** 5573:  gluseprogram(3) 08-15 20:37:05.650: e/adreno200-es20(5573): <qgl2drvapi_gluseprogram:1318>: **** 5573:  gluseprogram(6) 08-15 20:37:05.670: d/memalloc(5573): /dev/pmem: mapped buffer base:0x516f7000  size:4362240 offset:2826240 fd:58 

the code:

public class insertarlugar extends activity {   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_insertarlugar);      imagebutton imgbutton;      imgbutton = (imagebutton) findviewbyid(r.id.imgbutton);     edittext titlugar;      edittext desclugar;             titlugar = (edittext) findviewbyid(r.id.edit_titulo_lugar);     string tlugar = titlugar.gettext().tostring();      desclugar = (edittext) findviewbyid(r.id.edit_descripcion_lugar);     string dlugar = desclugar.gettext().tostring();      imgbutton.setonclicklistener(new onclicklistener() {          @override         public void onclick(view arg0) {                        final string[] items = {"cámara", "galería"};               alertdialog.builder builder = new                       alertdialog.builder(getapplicationcontext());              builder.settitle("foto");              builder.setitems(items, new dialoginterface.onclicklistener() {                  public void onclick(dialoginterface dialog, int item) {                       toast.maketext(insertarlugar.this, "click\n" + item,                               toast.length_short).show();                  }              });              alertdialog alert = builder.create();              alert.show();           }  }); } 

what's wrong?

thanks.

change line

alertdialog.builder(getapplicationcontext()); 

to

alertdialog.builder(insertarlugar.this); 

a dialog created on activity want use context create , not application's context. true ui objects, far understand context. may work objects such toast but, in opinion, better try , use correct context here activity's.

and see this answer when use context