Flutter SDK
This is the official documentation for the Amplitude Analytics Flutter SDK.
Flutter SDK Resources
Ampli Wrapper Not Yet Available
The Ampli Wrapper is an autogenerated library based on your pre-defined tracking plan. The Ampli Wrapper is not yet available for this SDK.
Installation¶
Add dependencies¶
-
Go to the
pubspec.yaml
file and add Amplitude SDK as a dependency.dependencies: amplitude_flutter: ^3.7.0
-
Run
flutter pub get
in the terminal to install the SDK.
iOS installation¶
Add platform :ios, '10.0'
to your Podfile.
To enable Bitcode, follow Flutter's documentation.
Usage and examples¶
Initialization¶
Before you can instrument, you must initialize the SDK using the API key for your Amplitude project.
import 'package:amplitude_flutter/amplitude.dart';
import 'package:amplitude_flutter/identify.dart';
class YourClass {
Future<void> exampleForAmplitude() async {
// Create the instance
final Amplitude analytics = Amplitude.getInstance(instanceName: "project");
// Initialize SDK
analytics.init(widget.apiKey);
// Log an event
analytics.logEvent('MyApp startup', eventProperties: {
'friend_num': 10,
'is_heavy_user': true
});
}
}
EU data residency¶
Beginning with version 3.6.0, you can configure the server zone after initializing the client for sending data to Amplitude's EU servers. The SDK sends data based on the server zone if it's set. The server zone configuration supports dynamic configuration as well.
For earlier versions, you need to configure the serverURL
property after initializing the client.
Note
For EU data residency, the project must be set up inside Amplitude EU. You must initialize the SDK with the API key from Amplitude EU.
// For versions starting from 3.6.0
// No need to call setServerUrl for sending data to Amplitude's EU servers
Amplitude.getInstance().setServerZone("EU");
// For earlier versions
Amplitude.getInstance().setServerUrl("https://api.eu.amplitude.com")
Send events¶
Basic events¶
Events represent how users interact with your application. For example, "button clicked" may be an action you want to track.
Amplitude.getInstance().logEvent('BUTTON_CLICKED');
Events with properties¶
Events can also contain properties. They provide context about the event taken. For example, "hover time" may be a relevant event property to "button click"
Amplitude.getInstance().logEvent('BUTTON_CLICKED', {"Hover Time": "100ms"});
Flush events¶
Events are typically stored in a buffer and flushed periodically. This behavior is configurable. You can also flush events manually
Amplitude.getInstance().uploadEvents();
User properties¶
User properties help you understand your users at the time they performed some action within your app such as their device details, their preferences, or language.
Amplitude-Flutter's identify
manages this feature. You need to import identify
before using it.
import 'package:amplitude_flutter/identify.dart';
User privacy warning
Don't track any user data that may be against your privacy terms.
Set a user property¶
set
¶
set
sets the value of a user property. You can also chain together multiple identify calls.
final Identify identify = Identify()
..set('gender','female')
..set('age',20);
Amplitude.getInstance().identify(identify);
setOnce
¶
setOnce
sets the value of a user property one time. Later calls using setOnce
are ignored.
final Identify identify1 = Identify();
identify1.setOnce('sign_up_date', '2015-08-24');
Amplitude.getInstance().identify(identify1);
final Identify identify2 = Identify();
identify2.setOnce('sign_up_date', '2015-08-24');
Amplitude.getInstance().identify(identify2);// is ignored
add
¶
add
increments a user property by some numerical value. If the user property doesn't have a value set yet, it's initialized to 0 before being incremented.
final Identify identify = Identify().add('karma', 0.123);
Amplitude.getInstance().identify(identify);
preInsert
¶
Adds a value or values to a user property at the beginning of the list, if the value doesn't exist in the user property yet. If the user property doesn't have a value set yet, it's initialized to an empty list before the new values are pre-inserted. If the user property has an existing value, nothing happens.
final Identify identify = Identify()
..preInsert('existing_list', 'some_property')
Amplitude.getInstance().identify(identify);
postInsert
¶
Adds a value or values to a user property at the end of the list, if the value doesn't exist in the user property yet. If the user property doesn't have a value set yet, it's initialized to an empty list before the new values are inserted. If the user property has an existing value, nothing happens.
final Identify identify = Identify()
..postInsert('existing_list','some_property')
Amplitude.getInstance().identify(identify);
Set multiple user properties¶
You can use setUserProperties
as a shorthand to set multiple user properties at one time. This method is a wrapper around Identify.set
and identify
.
Map<String, dynamic> userProps = {
'KEY': 'VALUE',
'OTHER_KEY': 'OTHER_VALUE'
};
Amplitude.getInstance().setUserProperties(userProperties);
Arrays in user properties¶
You can use arrays as user properties. You can directly set arrays or use append to generate an array.
const colors = ["rose", "gold"];
const numbers = [4, 5];
final Identify identify = Identify()
..set("colors", colors)
..append("ab-tests", "campaign_a")
..prepend("existing_list", numbers);
Amplitude.getInstance().identify(identify);
prepend
and append
¶
prepend
prepends a value or values to a user property.append
appends a value or values to a user property array. If the user property doesn't have a value set yet, it's initialized to an empty list before the new values are added. If the user property has an existing value and it's not a list, it's converted into a list with the new value added.
const array = ["some_string", 56];
final Identify identify = Identify()
..append("ab-tests", "new-user-test")
..preappend("some_list", array)
Amplitude.getInstance().identify(identify);
Remove user properties¶
Clear all user properties¶
clearUserProperties
clears all the current user's user properties.
Warning
The result is irreversible! Amplitude can't sync the user's user property values from before the wipe to any future events.
Amplitude.getInstance().clearUserProperties();
remove
¶
remove
removes a value or values from a user property. If the item doesn't exist in the user property, nothing happens.
const array = ["some_string", 56];
final Identify identify = Identify()
..remove("ab-tests", "new-user-test")
..remove("some_list",array);
Amplitude.getInstance().identify(identify);
unset
¶
unset
unsets and removes a user property.
final Identify identify = Identify()
..unset("ab-tests", "new-user-test")
..unset("some_list",array);
Amplitude.getInstance().identify(identify)
Track revenue¶
Amplitude can track revenue generated by a user. Revenue is tracked through distinct revenue objects, which have special fields that are used in Amplitude's Event Segmentation and Revenue LTV charts. This allows Amplitude to automatically display data relevant to revenue in the platform.
Note
Amplitude doesn't support currency conversion. All revenue data should be normalized to your currency of choice before being sent.
String productId = "product001";
int quantity = 2;
double price = 20;
double amount = 35;
Amplitude.getInstance().logRevenue(productId, quantity, price);
Amplitude.getInstance().logRevenueAmount(amount);
Info
Price can be negative, which may be useful for tracking revenue lost (such as refunds or costs).
Group user properties¶
Feature availability
This feature is available in accounts with a Growth or Enterprise plan with the Accounts add-on.
Use the Group Identify API to set or update properties of particular groups. Keep these considerations in mind:
- Updates affect only future events, and don't update historical events.
- You can track up to 5 unique group types and 10 total groups.
The groupIdentify
method accepts a group type string parameter and group name object parameter, and an Identify object that's applied to the group.
final Identify identify = Identify()
..set("gender", "female")
..set("age", 20);
Amplitude.getInstance().groupIdentify("groupType", "groupValue", identify);
User sessions¶
A session is a period of time that a user has the app in the foreground. Events that are logged within the same session have the same session_id
.
Sessions are handled automatically so you don't have to manually call an API like startSession()
or endSession()
.
Amplitude groups events together by session. A session represents a single period of user activity, with a start and end time.
Different SDKs track sessions differently, depending on the requirements of the platform.
You can choose to automatically log start and end session events corresponding to the start and end of a user's session.
//Enable automatically log start and end session events
Ampiltidue.getInstance().trackingSessionEvents(true);
//Disable automatically log start and end session events
Amplitidue.getInstance().trackingSessionEvents(false);
Set custom user ID¶
If your app has its own login system that you want to track users with, you can call setUserId
at any time.
Amplitude.getInstance().setUserId("test_user_id");
Set custom device ID¶
By default, device IDs are randomly generated UUIDs. You can define a custom device ID by calling setDeviceId
.
Amplitude.getInstance().setDeviceId('test_device_id');
You can retrieve the device ID that Amplitude uses with Amplitude.getInstance().getDeviceId().
This method can return null
if a deviceId
hasn't been generated yet.
Note
Amplitude doesn't recommend defining your own device IDs unless you have your own system for tracking user devices. Make sure the deviceId
you set is unique to prevent conflicts with other devices in your Amplitude data.
It's best practice to use something like a UUID.
Advanced topics¶
COPPA Control¶
COPPA (Children's Online Privacy Protection Act) restrictions on IDFA, IDFV, city, IP address and location tracking can be enabled or disabled all at once. Remember that apps asking for information from children under 13 years of age must comply with COPPA.
//Enable COPPA Control
Amplitude.getInstance().enableCoppaControl();
//Disable COPPA Control
Amplitude.getInstance().disableCoppaControl();
Advertising ID¶
Advertiser ID (also referred to as IDFA) is a unique identifier provided by the iOS and Google Play stores. As it's unique to every person and not just their devices, it's useful for mobile attribution. Mobile attribution is the attribution of an installation of a mobile app to its original source (for example, and ad campaign or app store search).
Mobile apps need permission to ask for IDFA, and apps targeted to children can't track at all. Consider IDFV, device id, or an email login system as alternatives when IDFA isn't available.
See iOS Advertising ID or the Android Advertising ID for more information.
Opt out of tracking¶
Users may wish to opt out of tracking entirely, which means no events and no records of their browsing history are tracked. setOptOut
provides a way to fulfill user requests for privacy.
//Disables instrumentation
Amplitude.getInstance().setOptOut(true);
//Enables instrumentation
Amplitude.getInstance().setOptOut(false);
Dynamic configuration¶
Flutter SDK lets users configure their apps to use dynamic configuration. This feature finds the best server URL automatically based on app users' location.
- If you have your own proxy server and use
setServerUrl
API, don't use dynamic configuration. - If you have users in Mainland China, Amplitude recommends that you use dynamic configuration.
- By default, this feature is off. You must explicitly enable it to use it.
- By default, this feature returns server URLs for Amplitude's US servers. If you need to send data to Amplitude's EU servers, use
setServerZone
to set it to EU zone.
Amplitude.getInstance().setUseDynamicConfig(true);
Flutter web support¶
Flutter web support delivers the same experiences on the web as on mobile. Amplitude-Flutter starts to support flutter web from v3.8.0.
These features aren't supported in Flutter web:
enableCoppaControl
disableCoppaControl
trackingSessionEvents
useAppSetIdForDeviceId
Usage¶
Append the following Amplitude-JavaScript snippet into web/index.html
in your Flutter project. The Amplitude-JavaScript version must be v8.12.0 and higher.
<script type="text/javascript" defer>
(function(e,t){var n=e.amplitude||{_q:[],_iq:{}};var r=t.createElement("script")
;r.type="text/javascript"
;r.integrity="sha384-UcvEbHmT0LE2ZB30Y3FmY3Nfw6puAKXz/LpCFuoywywYikMOr/519Uu1yNq2nL9w"
;r.crossOrigin="anonymous";r.async=true
;r.src="https://cdn.amplitude.com/libs/amplitude-8.12.0-min.gz.js"
;r.onload=function(){if(!e.amplitude.runQueuedFunctions){
console.log("[Amplitude] Error: could not load SDK")}}
;var s=t.getElementsByTagName("script")[0];s.parentNode.insertBefore(r,s)
;function i(e,t){e.prototype[t]=function(){
this._q.push([t].concat(Array.prototype.slice.call(arguments,0)));return this}}
var o=function(){this._q=[];return this}
;var a=["add","append","clearAll","prepend","set","setOnce","unset","preInsert","postInsert","remove"]
;for(var c=0;c<a.length;c++){i(o,a[c])}n.Identify=o;var u=function(){this._q=[]
;return this}
;var l=["setProductId","setQuantity","setPrice","setRevenueType","setEventProperties"]
;for(var p=0;p<l.length;p++){i(u,l[p])}n.Revenue=u
;var d=["init","logEvent","logRevenue","setUserId","setUserProperties","setOptOut","setVersionName","setDomain","setDeviceId","enableTracking","setGlobalUserProperties","identify","clearUserProperties","setGroup","logRevenueV2","regenerateDeviceId","groupIdentify","onInit","logEventWithTimestamp","logEventWithGroups","setSessionId","resetSessionId","getDeviceId","getUserId","setMinTimeBetweenSessionsMillis","setEventUploadThreshold","setUseDynamicConfig","setServerZone","setServerUrl","sendEvents","setLibrary","setTransport"]
;function v(e){function t(t){e[t]=function(){
e._q.push([t].concat(Array.prototype.slice.call(arguments,0)))}}
for(var n=0;n<d.length;n++){t(d[n])}}v(n);n.getInstance=function(e){
e=(!e||e.length===0?"$default_instance":e).toLowerCase()
;if(!Object.prototype.hasOwnProperty.call(n._iq,e)){n._iq[e]={_q:[]};v(n._iq[e])
}return n._iq[e]};e.amplitude=n})(window,document);
</script>
Compatibility Matrix¶
The following matrix lists the minimum support for Amplitude Flutter SDK version. For Gradle Version lower than v6.7.1, use Amplitude Flutter v3.10.0.
Amplitude Flutter |
Gradle | Android Gradle Plugin | Kotlin Gradle Plugin |
---|---|---|---|
3.11.+ |
6.7.1 |
3.6.4 |
1.7.10 |
Learn more about the Android Gradle Plugin compatibility, Gradle compatibility, and Kotlin compatibility.
Troubleshooting¶
If you have issues turning on Bitcode in iOS follow Flutter's documentation
More resources¶
If you have any problems with the SDK, create a GitHub issue or submit a request on Amplitude Help.
Still have questions? Ask them in the Community.