This is a sample application for building with the Square Mobile Payments SDK on Android. It creates a simple application that demonstrates installing, initializing, and authorizing the SDK, as well as taking a $1.00 payment with the Sandbox mock reader. To get started, clone this repo and follow the steps below.
For more detailed steps on adding the SDK to your application, please see the longform documentation.
Before getting started, please review the Requirements and Limitations and Device Compatibility sections to ensure that the SDK can be used in your project.
In your Developer Dashboard, create an application or open an existing one you would like to use. If this is your first time creating an application with Square, you can review this Get Started guide for more information.
On the application's Credentials page ensure that the toggle at the top is set to "Sandbox". Make note of:
- Sandbox Application ID
- Sandbox Access Token
Click "Locations" in the left navigation and make note of the Default Test Account's Sandbox Location ID as well. These values will be used in the next step.
Add the values from Step 2 into app/src/main/res/values/credentials.xml, replacing SANDBOX APPLICATION ID, SANDBOX ACCESS TOKEN, and SANDBOX LOCATION ID respectively:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="mpsdk_application_id">SANDBOX APPLICATION ID</string>
<string name="mpsdk_access_token">SANDBOX ACCESS TOKEN</string>
<string name="mpsdk_location_id">SANDBOX LOCATION ID</string>
</resources>In this project, credentials are set in this resource file. In your actual application, you're free to store the values in any way that's secure and makes sense for your project.
At this point the sample project should be runnable. Run it in your preferred Android device or emulator. The remaining steps will walk you through how a user would interact with the app.
Upon opening the app, Mobile Payments SDK will be initialized in /app/src/main/java/com/example/mpsdkquickstart/DemoApplication.kt
class DemoApplication : Application() {
override fun onCreate() {
super.onCreate()
MobilePaymentsSdk.initialize(getString(R.string.mpsdk_application_id), this)
}
}In the top right, tap the "Permissions" button. Tap on each of the checkboxes and grant the requested permissions. You can find a breakdown of the requested permissions here: Device permissions
In a real application, you'll need to implement this screen yourself.
Still within the Permissions dialog, click "Sign in" to authorize the SDK. This creates MobilePaymentsSdk.authorizationManager() and calls authorize(), which authorizes the SDK using the credentials you set.
For more information on using AuthorizationManager see Authorize your Android Application.
After authorizing, close the Permissions dialog to return to the main screen.
Note that since you're authorized in Sandbox mode, the floating Mock Reader UI button is displayed (via MockReaderUI.show()).
You can tap on this to simulate adding a Magstripe or Contactless & Chip Reader, as well as simulate swiping/tapping/inserting a card.
On the main screen, you can click "Settings" in the top left to display the reader settings screen. This is a preconfigured screen that's included with the SDK, so you do not need to implement it yourself. It's displayed by calling settingsManager.showSettings(). For more information, see our docs on Settings Manager.
Back on the main scren, tap the "Buy for $1" button. You'll be brought to a checkout screen requesting a $1 payment. Tap the Mock Reader UI button -> Add Contactless & Chip Reader -> Tap Card
After doing so, a test payment will be processed to your Sandbox account. You can verify that it was completed on your Sandbox Seller Dashboard Transactions page.
