IllegalStateException: Could not execute method of the activity with Android -

when press button(named "current location") should shows current address on textview(named "tvaddress") , should place marker on map in meantime.but it's not working expect. it's giving me errors.errors given below.

error :

02-05 23:37:22.429: e/androidruntime(20293): fatal exception: main 02-05 23:37:22.429: e/androidruntime(20293): java.lang.illegalstateexception: not execute method of activity 02-05 23:37:22.429: e/androidruntime(20293):    @ android.view.view$1.onclick(view.java:3680) 02-05 23:37:22.429: e/androidruntime(20293):    @ android.view.view.performclick(view.java:4191) 02-05 23:37:22.429: e/androidruntime(20293):    @ android.view.view$performclick.run(view.java:17229) 02-05 23:37:22.429: e/androidruntime(20293):    @ android.os.handler.handlecallback(handler.java:615) 02-05 23:37:22.429: e/androidruntime(20293):    @ android.os.handler.dispatchmessage(handler.java:92) 02-05 23:37:22.429: e/androidruntime(20293):    @ android.os.looper.loop(looper.java:137) 02-05 23:37:22.429: e/androidruntime(20293):    @ android.app.activitythread.main(activitythread.java:4960) 02-05 23:37:22.429: e/androidruntime(20293):    @ java.lang.reflect.method.invokenative(native method) 02-05 23:37:22.429: e/androidruntime(20293):    @ java.lang.reflect.method.invoke(method.java:511) 02-05 23:37:22.429: e/androidruntime(20293):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1038) 02-05 23:37:22.429: e/androidruntime(20293):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:805) 02-05 23:37:22.429: e/androidruntime(20293):    @ dalvik.system.nativestart.main(native method) 02-05 23:37:22.429: e/androidruntime(20293): caused by: java.lang.reflect.invocationtargetexception 02-05 23:37:22.429: e/androidruntime(20293):    @ java.lang.reflect.method.invokenative(native method) 02-05 23:37:22.429: e/androidruntime(20293):    @ java.lang.reflect.method.invoke(method.java:511) 02-05 23:37:22.429: e/androidruntime(20293):    @ android.view.view$1.onclick(view.java:3675) 02-05 23:37:22.429: e/androidruntime(20293):    ... 11 more 02-05 23:37:22.429: e/androidruntime(20293): caused by: java.lang.nullpointerexception 02-05 23:37:22.429: e/androidruntime(20293):    @ com.mamun.tasktest.mapactivity.marker(mapactivity.java:129) 02-05 23:37:22.429: e/androidruntime(20293):    ... 14 more 

mapactivity.java

     package com.mamun.tasktest;  import java.io.ioexception; import java.util.arraylist;  import android.app.activity; import android.app.alertdialog; import android.content.dialoginterface; import android.content.intent; import android.location.address; import android.location.geocoder; import android.location.location; import android.location.locationmanager; import android.os.bundle; import android.provider.settings; import android.view.view; import android.widget.button; import android.widget.textview; import android.widget.toast;  import com.google.android.gms.common.connectionresult; import com.google.android.gms.common.googleplayservicesclient; import com.google.android.gms.location.locationclient; import com.google.android.gms.location.locationlistener; import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.mapfragment; import com.google.android.gms.maps.googlemap.onmarkerdraglistener; import com.google.android.gms.maps.model.bitmapdescriptorfactory; import com.google.android.gms.maps.model.latlng; import com.google.android.gms.maps.model.marker; import com.google.android.gms.maps.model.markeroptions;  public class mapactivity extends activity implements googleplayservicesclient.connectioncallbacks, googleplayservicesclient.onconnectionfailedlistener, locationlistener {      private locationmanager manager;      private textview tvaddress;      private button btncurrent;      private locationclient locationclient;      private googlemap googlemap;      private mapfragment mapfragment;     @override     protected void oncreate(bundle savedinstancestate) {          manager = (locationmanager) getsystemservice(location_service);         tvaddress = (textview) findviewbyid(r.id.tvaddress);         btncurrent= (button)findviewbyid(r.id.btncurrent);            super.oncreate(savedinstancestate);           if (manager.isproviderenabled(locationmanager.gps_provider)) {             setcontentview(r.layout.map);         }          else if (!manager.isproviderenabled(locationmanager.gps_provider)) {             alertdialog.builder builder = new alertdialog.builder(this);             builder.settitle("gps disabled");             builder.setmessage("please enable gps use application.\nwould enable gps?");             builder.setpositivebutton("yes",                     new dialoginterface.onclicklistener() {                         @override                         public void onclick(dialoginterface dialog, int which) {                             intent = new intent(                                     settings.action_location_source_settings);                             startactivity(i);                              setcontentview(r.layout.map);                             mapfragment = (mapfragment) getfragmentmanager().findfragmentbyid(                                     r.id.maps);                              googlemap = mapfragment.getmap();                           }                      });              builder.setnegativebutton("no",                     new dialoginterface.onclicklistener() {                         @override                         public void onclick(dialoginterface dialog, int which) {                             finish();                          }                     });             builder.create().show();          }       locationclient = new locationclient(this, this, this);       }      public void marker(view v)     {         // add marker                 location currentlocation = locationclient.getlastlocation();                 double lat = currentlocation.getlatitude();                 double lng = currentlocation.getlongitude();                   markeroptions options = new markeroptions()                         .position(new latlng(lat, lng))                         .title("i here")                         .snippet("this current location")                          .icon(bitmapdescriptorfactory                                 .defaultmarker(bitmapdescriptorfactory.hue_azure));                 if (googlemap != null) {                     googlemap.addmarker(options);                 } else {                     toast.maketext(getapplicationcontext(), "map null",                             toast.length_long).show();                 }                  geocoder geocoder = new geocoder(this);                  try {                     arraylist<address> addresses = (arraylist<address>) geocoder                             .getfromlocation(currentlocation.getlatitude(),                                     currentlocation.getlongitude(), 5);                     address addr = addresses.get(0);                     tvaddress.settext(addr.getaddressline(0) + "-"                             + addr.getadminarea() + "-" + addr.getcountryname());                  } catch (ioexception e) {                     // todo auto-generated catch block                     e.printstacktrace();                 }      }      @override     protected void onresume() {         // todo auto-generated method stub         super.onresume();         locationclient.connect();     }     @override     protected void onpause() {         // todo auto-generated method stub         super.onpause();         locationclient.disconnect();     }      @override     public void onlocationchanged(location location) {         // todo auto-generated method stub      }      @override     public void onconnectionfailed(connectionresult result) {         // todo auto-generated method stub      }      @override     public void onconnected(bundle connectionhint) {      }      @override     public void ondisconnected() {         // todo auto-generated method stub      }       } 

map.xml

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical" >  <linearlayout              android:layout_width="wrap_content"              android:layout_height="wrap_content"              android:orientation="vertical" >      <edittext         android:id="@+id/etsearch"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:ems="10"         android:hint="search location" >          <requestfocus />     </edittext>      <textview         android:id="@+id/tvaddress"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="" />      <linearlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:orientation="horizontal" >          <button             android:id="@+id/btncurrent"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:onclick="marker"             android:text="current location"               android:layout_marginleft="98dp" />          <button             android:id="@+id/btnsave"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="save" />     </linearlayout>     </linearlayout>      <framelayout         android:id="@+id/map_container"         android:layout_width="match_parent"         android:layout_height="match_parent" >          <fragment             android:id="@+id/maps"             android:layout_width="match_parent"             android:layout_height="match_parent"             class="com.google.android.gms.maps.mapfragment" />        </framelayout>  </linearlayout>