Unable to find KickoffActivity Firebase

Question

I am using this site to build a chatapp, just for learning purposes. https://code.tutsplus.com/tutorials/how-to-create-an-android-chat-app-using-firebase--cms-27397

Unfortunately I always end up getting an error. I found this question how to solve Unable to find explicit activity in firebase AuthUi? but none of the answers solved my issue.

This is the error message:

Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.myapp.user.chatatwork/com.firebase.ui.auth.KickoffActivity}; have you declared this activity in your AndroidManifest.xml?

My AndroidManifest.xml looks like this:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.myapp.user.chatatwork">
<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:theme="@style/AppTheme"
    android:supportsRtl="true"
    tools:replace="android:value"
    >


    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>

    <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
</application>

This is my gradle(app)

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:26.1.0'
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    implementation 'com.google.firebase:firebase-core:10.0.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    compile 'com.firebaseui:firebase-ui:1.1.1'
    compile 'com.android.support:design:26.0.0'

}

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

EDIT

This is the KickoffActivity class in Firebase:

@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
public class KickoffActivity extends HelperActivityBase {
    private static final String TAG = "KickoffActivity";
    private static final String IS_WAITING_FOR_PLAY_SERVICES = "is_waiting_for_play_services";
    private static final int RC_PLAY_SERVICES = 1;

    private boolean mIsWaitingForPlayServices = false;

    public static Intent createIntent(Context context, FlowParameters flowParams) {
        return ActivityHelper.createBaseIntent(context, KickoffActivity.class, flowParams);
    }

    @Override
    protected void onCreate(Bundle savedInstance) {
        super.onCreate(savedInstance);

        if (savedInstance == null || savedInstance.getBoolean(IS_WAITING_FOR_PLAY_SERVICES)) {
            if (isOffline()) {
                Log.d(TAG, "No network connection");
                finish(ErrorCodes.NO_NETWORK,
                       IdpResponse.getErrorCodeIntent(ErrorCodes.NO_NETWORK));
                return;
            }

            boolean isPlayServicesAvailable = PlayServicesHelper.makePlayServicesAvailable(
                    this,
                    RC_PLAY_SERVICES,
                    new DialogInterface.OnCancelListener() {
                        @Override
                        public void onCancel(DialogInterface dialog) {
                            finish(ResultCodes.CANCELED,
                                   IdpResponse.getErrorCodeIntent(
                                           ErrorCodes.UNKNOWN_ERROR));
                        }
                    });

            if (isPlayServicesAvailable) {
                SignInDelegate.delegate(this, mActivityHelper.getFlowParams());
            } else {
                mIsWaitingForPlayServices = true;
            }
        }
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        // It doesn't matter what we put here, we just don't want outState to be empty
        outState.putBoolean(ExtraConstants.HAS_EXISTING_INSTANCE, true);
        outState.putBoolean(IS_WAITING_FOR_PLAY_SERVICES, mIsWaitingForPlayServices);
        super.onSaveInstanceState(outState);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RC_PLAY_SERVICES) {
            if (resultCode == ResultCodes.OK) {
                SignInDelegate.delegate(this, mActivityHelper.getFlowParams());
            } else {
                finish(ResultCodes.CANCELED,
                       IdpResponse.getErrorCodeIntent(ErrorCodes.UNKNOWN_ERROR));
            }
        } else {
            SignInDelegate delegate = SignInDelegate.getInstance(this);
            if (delegate != null) delegate.onActivityResult(requestCode, resultCode, data);
        }
    }

    /**
     * Check if there is an active or soon-to-be-active network connection.
     *
     * @return true if there is no network connection, false otherwise.
     */
    private boolean isOffline() {
        ConnectivityManager manager =
                (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

        return !(manager != null
                && manager.getActiveNetworkInfo() != null
                && manager.getActiveNetworkInfo().isConnectedOrConnecting());
    }
}

Answer 1

Change this:

implementation 'com.google.firebase:firebase-core:10.0.1'
compile 'com.firebaseui:firebase-ui:1.1.1'

to the latest version:

implementation 'com.firebaseui:firebase-ui-auth:3.3.0'
implementation 'com.firebaseui:firebase-ui-database:3.3.0'
implementation 'com.google.firebase:firebase-core:12.0.1'

Answer 2

The following error:

Caused by: android.content.ActivityNotFoundException:
Unable to find explicit activity class {com.myapp.user.chatatwork/com.firebase.ui.auth.KickoffActivity};
have you declared this activity in your AndroidManifest.xml?

Tells you exactly what the problem is. You are using an activity, named KickoffActivity that is not declared in the AndroidManifest.xml file. To solve this, please add the following line of code, right after the </activity> tag.

<activity android:name="com.firebase.ui.auth.KickoffActivity"/>

Updating the Firebase and Firebase-UI dependencies to the last version, as Peter mentioned in his answer, it is very good practice.