Google sign in signed apk not working

Question

Well all works till i generate the signed apk . I followed the entire process as told on the google developers page

1.I generated the google-services.json file with keyhash and package name in it
2.Included all the class level and application level dependencies like this

// Top-level build file where you can add configuration options common to all sub-projects/modules.

 buildscript {
repositories {
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:1.3.0'
    classpath 'com.google.gms:google-services:2.0.0-alpha6'

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
}
}
 allprojects {
  repositories {
     jcenter()
   }
  }

Application gradle file

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'

android {
compileSdkVersion 23
buildToolsVersion "23.0.0"

defaultConfig {
    applicationId "com.example.skmishra.finalgooglesignin"
    minSdkVersion 14
    targetSdkVersion 23
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'),          'proguard-rules.pro'
    }
   }
}

 dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.google.android.gms:play-services:8.3.0'


}

4. My Sign In java Code

   package com.example.skmishra.finalgooglesignin;
   
   import android.content.Intent;
   import android.support.v7.app.AppCompatActivity;
   import android.os.Bundle;
   import android.util.Log;
   import android.view.Menu;
   import android.view.MenuItem;
   import android.view.View;
   import android.widget.Button;
   import android.widget.Toast;
   
   import com.google.android.gms.auth.api.Auth;
   import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
   import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
   import com.google.android.gms.auth.api.signin.GoogleSignInResult;
   import com.google.android.gms.common.ConnectionResult;
   import com.google.android.gms.common.SignInButton;
   import com.google.android.gms.common.api.GoogleApiClient;
   
   public class MainActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener, View.OnClickListener {
   
       private static final int RC_SIGN_IN = 200 ;
       private static final String TAG = "Sign In" ;
       private GoogleApiClient mGoogleApiClient;
      SignInButton google;
   
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
           // Configure sign-in to request the user's ID, email address, and basic
   // profile. ID and basic profile are included in DEFAULT_SIGN_IN.
           GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                   .requestEmail()
                   .build();
           mGoogleApiClient = new GoogleApiClient.Builder(this)
                   .enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
                   .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                   .build();
           SignInButton signInButton = (SignInButton) findViewById(R.id.sign_in_button);
           signInButton.setSize(SignInButton.SIZE_STANDARD);
           signInButton.setScopes(gso.getScopeArray());
           google=(SignInButton)findViewById(R.id.sign_in_button);
           google.setOnClickListener(this);
   
   
       }
   
   
       @Override
       public void onConnectionFailed(ConnectionResult connectionResult) {
           Toast.makeText(this,"Failed to connect",Toast.LENGTH_LONG).show();
       }
   
       @Override
       public void onClick(View v) {
           switch (v.getId()) {
               case R.id.sign_in_button:
                   signIn();
                   break;
               // ...
           }
       }
   
       private void signIn() {
           Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
           startActivityForResult(signInIntent, RC_SIGN_IN);
       }
       @Override
       public void onActivityResult(int requestCode, int resultCode, Intent data) {
           super.onActivityResult(requestCode, resultCode, data);
   
           // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
           if (requestCode == RC_SIGN_IN) {
               GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
               handleSignInResult(result);
           }
       }
   
       private void handleSignInResult(GoogleSignInResult result) {
           Log.d(TAG, "handleSignInResult:" + result.isSuccess());
           if (result.isSuccess()) {
               // Signed in successfully, show authenticated UI.
               GoogleSignInAccount acct = result.getSignInAccount();
               Toast.makeText(this,"Name :"+acct.getDisplayName()+" Email :"+acct.getEmail(),Toast.LENGTH_LONG).show();
           } else {
               // Signed out, show unauthenticated UI.
               Toast.makeText(this,"Signed out ",Toast.LENGTH_LONG).show();
           }
       }
   }
   

   5. My layout code

          <com.google.android.gms.common.SignInButton
              android:id="@+id/sign_in_button"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="Check this out"
      
              />
      

Answer 1

As I understand, you have provided the debug SHA1 in the developer console, then you signed the apk and the SHA1 changed. If this is the case try the following you should obtain the release SHA1 from the keystore and replace the old SHA with that.

1. Open terminal and change the directory to JDK bin directory. Include your installed JDK version inside the path, for me it was - jdk1.8.0_101 (type javac -version to get the Java version) :

Mac

    cd /Library/Java/JavaVirtualMachines/<your_JDK_version>.jdk/Contents/Home/bin

Windows

    cd C:\Program Files\Java\your_JDK_version\bin 

2. Use keytool to obtain the release SHA1 :

    keytool -list -v -keystore <keystore_name> -alias <alias_name>

3. Go to your project's credentials page and replace the SHA1 to your keystore's release SHA1.