usage
is a wrapper around Google Analytics for command-line, web, and Flutter apps.
To use this library as a web app, import the usage_html.dart
library and
instantiate the AnalyticsHtml
class.
When you are creating a new property at google analytics make sure to select the mobile app option, not the website option.
Flutter applications can use the AnalyticsIO
version of this library. They will need
to specify the documents directory in the constructor in order to tell the library where
to save the analytics preferences:
import 'package:flutter/services.dart';
import 'package:usage/usage_io.dart';
void main() {
final String UA = ...;
Analytics ga = new AnalyticsIO(UA, 'ga_test', '3.0',
documentsDirectory: PathProvider.getApplicationDocumentsDirectory());
...
}
To use this library as a command-line app, import the usage_io.dart
library
and instantiate the AnalyticsIO
class.
Note, for CLI apps, the usage library will send analytics pings asynchronously. This is useful it that it doesn't block the app generally. It does have one side-effect, in that outstanding asynchronous requests will block termination of the VM until that request finishes. So, for short-lived CLI tools, pinging Google Analytics can cause the tool to pause for several seconds before it terminates. This is often undesired - gathering analytics information shouldn't negatively effect the tool's UX.
One solution to this is to use the waitForLastPing({Duration timeout})
method
on the analytics object. This will wait until all outstanding analytics requests
have completed, or until the specified duration has elapsed. So, CLI apps can do
something like:
await analytics.waitForLastPing(timeout: new Duration(milliseconds: 200));
analytics.close();
or:
await analytics.waitForLastPing(timeout: new Duration(milliseconds: 200));
exit(0);
Import the package (in this example we use the dart:io
version):
import 'package:usage/usage_io.dart';
And call some analytics code:
final String UA = ...;
Analytics ga = new AnalyticsIO(UA, 'ga_test', '3.0');
ga.optIn = true;
ga.sendScreenView('home');
ga.sendException('foo exception');
ga.sendScreenView('files');
ga.sendTiming('writeTime', 100);
ga.sendTiming('readTime', 20);
You can use this library in an opt-in manner or an opt-out one. It defaults to
opt-out - data will be sent to Google Analytics unless the user explicitly
opts-out. The mode can be adjusted by changing the value of the
Analytics.analyticsOpt
field.
Opt-out In opt-out mode, if the user does not explicitly opt-out of collecting
analytics (Analytics.enabled = false
), the usage library will send usage data.
Opt-in In opt-in mode, no data will be sent until the user explicitly opt-in
to collection (Analytics.enabled = true
). This includes screen views, events,
timing information, and exceptions.
For both classes, you need to provide a Google Analytics tracking ID, the application name, and the application version.
Your application should provide an opt-in option for the user. If they opt-in,
set the optIn
field to true
. This setting will persist across sessions
automatically.
Note: This library is intended for use with the Google Analytics application / mobile app style tracking IDs (as opposed to the web site style tracking IDs).
For more information, please see the Google Analytics Measurement Protocol Policy.
Tests can be run using pub run test
.
Please file reports on the GitHub Issue Tracker.
You can view our license here.