initializeApp method
Creates and initializes a Firebase App instance with the given
options
and name
.
The options is initialized with provided credential
and databaseURL
.
A valid credential can be obtained with cert or
certFromPath.
The name
argument allows using multiple Firebase applications at the same
time. If omitted then default app name is used.
Example:
var certificate = FirebaseAdmin.instance.cert(
projectId: 'your-project-id',
clientEmail: 'your-client-email',
privateKey: 'your-private-key',
);
var app = FirebaseAdmin.instance.initializeApp(
AppOptions(
credential: certificate,
databaseURL: 'https://your-database.firebase.io')
);
See also:
Implementation
App initializeApp([AppOptions? options, String name = defaultAppName]) {
options ??= _loadOptionsFromEnvVar(Credentials.applicationDefault());
if (name.isEmpty) {
throw FirebaseAppError.invalidAppName(
'Invalid Firebase app name "$name" provided. App name must be a non-empty string.',
);
} else if (_apps.containsKey(name)) {
if (name == defaultAppName) {
throw FirebaseAppError.duplicateApp(
'The default Firebase app already exists. This means you called initializeApp() '
'more than once without providing an app name as the second argument. In most cases '
'you only need to call initializeApp() once. But if you do want to initialize '
'multiple apps, pass a second argument to initializeApp() to give each app a unique '
'name.',
);
} else {
throw FirebaseAppError.duplicateApp(
'Firebase app named "$name" already exists. This means you called initializeApp() '
'more than once with the same app name as the second argument. Make sure you provide a '
'unique name every time you call initializeApp().',
);
}
}
return _apps[name] = App(name, options);
}