CODEWITHSUNDEEP
androidfirebasefirebase-authentication
atlascoder
atlascoder

Reputation: 3063

FirebaseAuth ClassCastException

I am getting strange exception from deep of Android:

java.lang.RuntimeException: Unable to resume activity {com.example.firebase/com.example.firebase.MainActivity}: java.lang.ClassCastException: com.google.android.gms.b.qf cannot be cast to com.google.firebase.auth.n
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2937)
    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2966)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2367)
    at android.app.ActivityThread.access$700(ActivityThread.java:168)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1329)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:177)
    at android.app.ActivityThread.main(ActivityThread.java:5493)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:525)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1225)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1041)
    at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassCastException: com.google.android.gms.b.qf cannot be cast to com.google.firebase.auth.n
    at com.google.android.gms.b.aw.a(Unknown Source)
    at com.google.firebase.auth.FirebaseAuth.b(Unknown Source)
    at com.google.firebase.auth.FirebaseAuth.<init>(Unknown Source)
    at com.google.firebase.auth.FirebaseAuth.<init>(Unknown Source)
    at com.google.android.gms.b.av.<init>(Unknown Source)
    at com.google.firebase.auth.FirebaseAuth.a(Unknown Source)
    at com.google.firebase.auth.FirebaseAuth.b(Unknown Source)
    at com.atlascoder.android.dollaruz.MainActivity.onResume(Unknown Source)
    at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1209)
    at android.app.Activity.performResume(Activity.java:5450)
    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2922)
...

And it occurs within the onResume() callback for my AppCompatActivity:

...

FirebaseAuth mAuth;

@Override
protected void onResume(){
    super.onResume();

        if (mAuth == null) {
            mAuth = FirebaseAuth.getInstance();
            mAuth.signInAnonymously().addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    FirebaseUser user = mAuth.getCurrentUser();
                    if (user != null) {
                        setActiveFragment(mActiveFragmentTag);
                    } else {
                        Toast.makeText(MainActivity.this, getString(R.string.toast_cant_auth_firebase), Toast.LENGTH_SHORT).show();
                    }
                }
            });
        } else {
            setActiveFragment(mActiveFragmentTag);
        }
}

...

It occurs no when first called but when I reopen the app after some time. And, what is more strange, I can't open the app even after restarting of the app (I mean restarting on device and not reinstalling).

My module's build.gradle content:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion '24.0.0'
    defaultConfig {
        applicationId "com.example.firebase"
        minSdkVersion 14
        targetSdkVersion 23
        versionName '1.3'
        vectorDrawables.useSupportLibrary = true
        versionCode 4
    }
    testOptions {
        unitTests.returnDefaultValues = true
    }
    buildTypes {
        release {
            minifyEnabled true
            proguardFile getDefaultProguardFile('proguard-android-optimize.txt')
        }
    }
    productFlavors {
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    testCompile 'org.mockito:mockito-core:1.10.19'
    compile 'com.android.support:appcompat-v7:23.3.0'
    compile 'com.google.android.gms:play-services-ads:9.2.1'
    compile 'me.grantland:autofittextview:0.2.+'
    compile 'com.google.firebase:firebase-auth:9.2.1'
    compile 'com.google.firebase:firebase-messaging:9.2.1'
    compile 'com.google.firebase:firebase-database:9.2.1'
    compile 'com.android.support:cardview-v7:23.3.0'
    compile 'com.android.support:design:23.3.0'
}

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

What could be wrong?

Upvotes: 0

Views: 2750

Answers (4)

changxw
changxw

Reputation: 16

call FirebaseAuth.getInstance().signOut() in onDestroy of MainActivity after you sign in, you can try it.

Upvotes: 0

Waylent
Waylent

Reputation: 185

you can add following proguard rules in your proguard file to solve this problems.

-keepattributes Signature

The "Signature" attribute is required to be able to access generic types when compiling in JDK 5.0 and higher.

com.google.android.gms.b.qf is a generic types.

Upvotes: 3

zncoder
zncoder

Reputation: 61

As a workaround try minifyEnabled true -> minifyEnabled false It helped me. Sure, after this size of apk has grown, but app started to work.

Upvotes: 0

Bob Snyder
Bob Snyder

Reputation: 38289

Using the code and versions of the dependencies you posted, I was able create crash stacks similar to yours, although the exception was:

java.lang.IncompatibleClassChangeError: com.google.android.gms.internal.zzaez

The problem went away when I changed the dependencies to use version 9.4.0 of the Firebase and Play Services libraries. See if that works for you.

There are many reports on SO of unusual Firebase problems caused by using older or inconsistent versions of libraries or tools. It seems wise to always use the latest versions, if possible.

In your case those would be:

compileSdkVersion 24
buildToolsVersion "24.0.1"

Support libs: 24.1.1

Firebase/PlayServices: 9.4.0

Upvotes: 1

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