android - Application crashes when logging in using facebook or google account -


i have followed tutorial create aplication login using facebook , google using firebase."sign in email" button works fine, when try login using google or facebook application crashed.

here mainactivity

public class mainactivity extends appcompatactivity  implements  view.onclicklistener{  private  static final int rc_sign_in=0; firebaseauth auth;   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     firebaseauth auth=firebaseauth.getinstance();      if(auth.getcurrentuser()!=null)     {         log.d("auth",auth.getcurrentuser().getemail());     }     else {         startactivityforresult(authui.getinstance()                 .createsigninintentbuilder().setproviders(                         authui.facebook_provider,                         authui.google_provider,                         authui.email_provider                  ).build(), rc_sign_in);     }      findviewbyid(r.id.btnlogout).setonclicklistener(this); } @override protected void onactivityresult(int requestcode, int resultcode, intent data) {     super.onactivityresult(requestcode, resultcode, data);     if(requestcode==rc_sign_in)     {         if(resultcode==result_ok)         {             log.d("auth",auth.getcurrentuser().getemail());         }         else         {             log.d("auth","not authenticated");         }     } }  @override public void onclick(view view) {     if(view.getid()==r.id.btnlogout)     {         authui.getinstance().signout(this).addoncompletelistener(new oncompletelistener<void>() {             @override             public void oncomplete(@nonnull task<void> task) {                 log.d("auth","user logged out");                 finish();             }         });     } }

}

build.gradle(app) file

    apply plugin: 'com.android.application'  android {     compilesdkversion 25     buildtoolsversion "25.0.2"     defaultconfig {         applicationid "com.example.ranjit.authenticate"         minsdkversion 18         targetsdkversion 25         versioncode 1         versionname "1.0"         testinstrumentationrunner "android.support.test.runner.androidjunitrunner"         multidexenabled = true     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile filetree(dir: 'libs', include: ['*.jar'])     androidtestcompile('com.android.support.test.espresso:espresso-core:2.2.2', {         exclude group: 'com.android.support', module: 'support-annotations'     })      compile 'com.firebaseui:firebase-ui-auth:0.4.4'     compile 'com.android.support:appcompat-v7:25.1.0'     compile 'com.google.firebase:firebase-auth:10.0.1'     compile 'com.google.android.gms:play-services-auth:10.0.1'     testcompile 'junit:junit:4.12' }  apply plugin: 'com.google.gms.google-services'

and below logcat application

08-21 03:09:24.419 23408-23408/com.example.ranjit.authenticate e/androidruntime: fatal exception: main                                                                              process: com.example.ranjit.authenticate, pid: 23408                                                                              java.lang.runtimeexception: failure delivering result resultinfo{who=null, request=0, result=-1, data=intent {  }} activity {com.example.ranjit.authenticate/com.example.ranjit.authenticate.mainactivity}: java.lang.nullpointerexception                                                                                  @ android.app.activitythread.deliverresults(activitythread.java:3532)                                                                                  @ android.app.activitythread.handlesendresult(activitythread.java:3575)                                                                                  @ android.app.activitythread.access$1300(activitythread.java:139)                                                                                  @ android.app.activitythread$h.handlemessage(activitythread.java:1341)                                                                                  @ android.os.handler.dispatchmessage(handler.java:102)                                                                                  @ android.os.looper.loop(looper.java:149)                                                                                  @ android.app.activitythread.main(activitythread.java:5257)                                                                                  @ java.lang.reflect.method.invokenative(native method)                                                                                  @ java.lang.reflect.method.invoke(method.java:515)                                                                                  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793)                                                                                  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:609)                                                                                  @ dalvik.system.nativestart.main(native method)                                                                               caused by: java.lang.nullpointerexception                                                                                  @ com.example.ranjit.authenticate.mainactivity.onactivityresult(mainactivity.java:50)                                                                                  @ android.app.activity.dispatchactivityresult(activity.java:5603)                                                                                  @ android.app.activitythread.deliverresults(activitythread.java:3528)                                                                                  @ android.app.activitythread.handlesendresult(activitythread.java:3575)                                                                                   @ android.app.activitythread.access$1300(activitythread.java:139)                                                                                   @ android.app.activitythread$h.handlemessage(activitythread.java:1341)                                                                                   @ android.os.handler.dispatchmessage(handler.java:102)                                                                                   @ android.os.looper.loop(looper.java:149)                                                                                   @ android.app.activitythread.main(activitythread.java:5257)                                                                                   @ java.lang.reflect.method.invokenative(native method)                                                                                   @ java.lang.reflect.method.invoke(method.java:515)                                                                                   @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793)                                                                                   @ com.android.internal.os.zygoteinit.main(zygoteinit.java:609)                                                                                   @ dalvik.system.nativestart.main(native method) 

08-21 03:09:30.779 23408-23421/com.example.ranjit.authenticate w/dynamitemodule: local module descriptor class com.google.firebase.auth not found.

you have null pointer exception in method. it's way access auth

        log.d("auth",auth.getcurrentuser().getemail()

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