ilia ilia - 6 months ago 60
Android Question

Implementing sign in with Google, And getting weird "unfortunately, MyApp has stopped"

I have implemented Google Sign-In button in my app.

Google Sign in Button image

Everything works really well except one thing, when the intent prompts the user to select a Google account to sign in with, if the user press the back button he will get

unfortunately, MyApp has stopped
and the app will crash.

I really don't know where should I start for picking a solution for this problem, any help would be appreciated.

Hers is a sample of the code:

private SignInButton googleLogin;
private GoogleApiClient apiClient;
private GoogleSignInOptions gso;
private String googleUserName;
private String googleUserMail;
private static final int REQ_ID = 9001;

gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.build();
apiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this,this)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();

googleLogin = (SignInButton) findViewById(R.id.googleSignIn);
googleLogin.setSize(SignInButton.SIZE_STANDARD);
googleLogin.setScopes(gso.getScopeArray());

googleLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent signIntent = Auth.GoogleSignInApi.getSignInIntent(apiClient);
startActivityForResult(signIntent,REQ_ID);
}
});

@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
super.onActivityResult(requestCode, resultCode, data);
callbackManager.onActivityResult(requestCode, resultCode, data);
if(requestCode == REQ_ID)
{
GoogleSignInResult res = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
GoogleSignInAccount account = res.getSignInAccount();
googleUserName = account.getDisplayName().toString();
googleUserMail = account.getEmail().toString();


}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {

}


And here is the log:

`05-27 06:06:56.420 22660-22738/com.MyApp W/EGL_emulation: eglSurfaceAttrib not implemented
05-27 06:06:56.420 22660-22738/com.MyApp W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0x99ada7c0, error=EGL_SUCCESS
05-27 06:07:03.147 22660-22660/com.MyApp D/AndroidRuntime: Shutting down VM
05-27 06:07:03.147 22660-22660/com.MyApp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.MyApp, PID: 22660
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=9001, result=0, data=Intent { (has extras) }} to activity {com.MyApp/com.MyApp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.android.gms.auth.api.signin.GoogleSignInAccount.getDisplayName()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.android.gms.auth.api.signin.GoogleSignInAccount.getDisplayName()' on a null object reference
at com.door.global.store.MainActivity.onActivityResult(MainActivity.java:200)
at android.app.Activity.dispatchActivityResult(Activity.java:6428)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742) 
at android.app.ActivityThread.-wrap16(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5417) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
`

Answer

Try this in onActivityResult

if(requestCode == REQ_ID && resultCode == Activity.RESULT_OK). 

Because its not signed in probably and its returning null. Do a null check for account as well.

GoogleSignInAccount account = res.getSignInAccount();
if(account != null){
        googleUserName = account.getDisplayName().toString();
        googleUserMail = account.getEmail().toString();
}
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