Google+ sign-in button on Android doesn't do anything when clicked -


i trying implement google+ login in android app. have followed google+ api tutorials. however, when click sign-in button, nothing happens, no dialog or prompt appears login. logcat not showing errors either. cannot seem understand why not working when have followed google+ api docs.

here code:

package com.chromiumapps.fost;  import android.content.intent; import android.content.intentsender.sendintentexception; import android.content.sharedpreferences; import android.os.bundle; import android.support.v4.app.fragmentactivity; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.toast; import static android.view.view.*;  import com.google.android.gms.common.connectionresult; import com.google.android.gms.common.googleplayservicesclient.connectioncallbacks; import com.google.android.gms.common.googleplayservicesclient.onconnectionfailedlistener; import com.google.android.gms.common.api.googleapiclient; import com.google.android.gms.plus.plus;  public class fostactivity extends fragmentactivity implements googleapiclient.connectioncallbacks, googleapiclient.onconnectionfailedlistener, onclicklistener {      /* called when activity first created. */      /*      * public boolean facebook = false; public boolean twitter = false; public      * boolean googleplus = false; public boolean blogger = false;      */      private mainfragment mainfragment;     sharedpreferences pref;         private static final int rc_sign_in=0;     private googleapiclient mgoogleapiclient;     private boolean mintentinprogress;     private boolean msigninclicked;      private connectionresult mconnectionresult;         @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         pref = getpreferences(0);         sharedpreferences.editor edit = pref.edit();         edit.putstring("consumer_key", consumer_key);         edit.putstring("consumer_secret", consumer_secret);         edit.commit();          if (savedinstancestate == null) {             // add fragment on initial activity setup             mainfragment = new mainfragment();             getsupportfragmentmanager().begintransaction()                     .add(android.r.id.content, mainfragment).commit();             //s = new sharebaractivity();             //getsupportfragmentmanager().begintransaction()                     //.add(android.r.id.content, s).commit();           } else {             // or set fragment restored state info             mainfragment = (mainfragment) getsupportfragmentmanager().findfragmentbyid(android.r.id.content);             //linkedinfragment = (linkedin_fragment) getsupportfragmentmanager().findfragmentbyid(android.r.id.content);          }         setcontentview(r.layout.main);           findviewbyid(r.id.sign_in_button).setonclicklistener(this);         findviewbyid(r.id.sign_out_button).setonclicklistener(this);         mgoogleapiclient = new googleapiclient.builder(this)                             .addconnectioncallbacks(this)                             .addonconnectionfailedlistener(this)                             .addapi(plus.api, new plus.plusoptions.builder().build())                             .addscope(plus.scope_plus_login)                             .build();       }      protected void onstart(){         super.onstart();         mgoogleapiclient.connect();     }      protected void onstop(){         super.onstop();         if (mgoogleapiclient.isconnected()){             mgoogleapiclient.disconnect();          }      }     protected void onacitivityresult(int requestcode, int responsecode, intent intent){         if (requestcode==rc_sign_in){             if (responsecode != result_ok) {                   msigninclicked = false;                 }                  mintentinprogress = false;               if (!mgoogleapiclient.isconnecting()) {                  mgoogleapiclient.connect();               }         }     }        @override     public void onconnected(bundle arg0) {         // todo auto-generated method stub         msigninclicked = false;      }      @override     public void onconnectionsuspended(int arg0) {         // todo auto-generated method stub         mgoogleapiclient.connect();     }        public void onconnectionfailed(connectionresult result) {         // todo auto-generated method stub         if (!mintentinprogress) {             // store connectionresult can use later when user clicks             // 'sign-in'.             mconnectionresult = result;              if (msigninclicked) {               // user has clicked 'sign-in' attempt resolve               // errors until user signed in, or cancel.               resolvesigninerror();             }           }      }      protected void resolvesigninerror(){         if(mconnectionresult.hasresolution()){             try {                   mintentinprogress = true;                   startintentsenderforresult(mconnectionresult.getresolution().getintentsender(),                       rc_sign_in, null, 0, 0, 0);                 } catch (sendintentexception e) {                   // intent canceled before sent.  return default                   // state , attempt connect updated connectionresult.                   mintentinprogress = false;                   mgoogleapiclient.connect();                 }               }       }      @override     public void onclick(view v) {         // todo auto-generated method stub         if(v.getid()==r.id.sign_in_button && !mgoogleapiclient.isconnecting()){             msigninclicked=true;              resolvesigninerror();          }          if(v.getid()==r.id.sign_out_button){             if(mgoogleapiclient.isconnected()){                 plus.accountapi.cleardefaultaccount(mgoogleapiclient);                 mgoogleapiclient.disconnect();                 mgoogleapiclient.connect();             }         }       } } 

try @ mgoogleapiclient

   mgoogleapiclient = new googleapiclient.builder(this)             .addapiifavailable(drive.api)             .addconnectioncallbacks(this)             .addonconnectionfailedlistener(this).addapi(plus.api, plus.plusoptions.builder().build())             .addscope(plus.scope_plus_login).build(); 

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