The Play Core Library allows you to locally test your app’s ability to do the following, without connecting to the Play Store:
This page describes how to deploy your app's split APKs to your test device so that Play Core automatically uses those APKs to simulate requesting, downloading, and installing modules from the Play Store.
Although you don't need to make any changes to your app's logic, you need to meet the following requirements:
- Download and install the latest version of
bundletool. You need
bundletoolto build a new set of installable APKs from your app's bundle.
- Make sure your app is using Play Core 1.7.2 or higher. To learn more, see Include the Play Core Library in your project.
Build a set of APKs
If you haven't already done so, build your app’s split APKs, as follows:
- Build an app bundle for your app using one of the following methods:
bundletoolto generate a set of APKs for all device configurations with the following command:
bundletool build-apks --local-testing --bundle my_app.aab --output my_app.apks
--local-testing flag includes meta-data in your APKs' manifests that
lets the Play Core library know to use the local split APKs to test
installing feature modules, without connecting to the Play Store.
Deploy your app to the device
After you build a set of APKs using the
bundletool to install the base version of your app and transfer additional
APKs to your device's local storage. You can perform both actions with the
bundletool install-apks --apks my_app.apks
Now, when you start your app and complete the user flow to download and install
a feature module, the Play Core Library uses the APKs that
transferred to the device's local storage.
Simulate a network error
To simulate module installs from the Play Store, the Play Core Library uses an
alternative to the
to request the module. When you use
bundletool with the
to build a set of APKs and deploy them to your test device, it
includes metadata that instructs the Play Core Library to automatically switch
your app's API calls to invoke
FakeSplitInstallManager, instead of
FakeSplitInstallManager includes a boolean flag that you can enable to
simulate a network error the next time your app requests to install a module. To
FakeSplitInstallManager in your tests, you can get an instance of it
as shown below:
// Creates an instance of FakeSplitInstallManager with the app's context. val fakeSplitInstallManager = FakeSplitInstallManagerFactory.create(context) // Tells Play Core Library to force the next module request to // result in a network error. fakeSplitInstallManager.setShouldNetworkError(true)
// Creates an instance of FakeSplitInstallManager with the app's context. FakeSplitInstallManager fakeSplitInstallManager = FakeSplitInstallManagerFactory.create(context); // Tells Play Core Library to force the next module request to // result in a network error. fakeSplitInstallManager.setShouldNetworkError(true);