Droidcon London: Preparing your app for Google Play Instant

Android Instant applications are becoming increasingly available, and thanks to the work from the Android platform team can already be installed on devices running Android Lollipop or later.

As an application developer for a large application, or one with plenty of untested legacy code, preparing an application that might be tightly coupled into a single module requires us to carefully de-tangle and move concerns to independent modules.

This talk covers how we managed to prepare our application for instant apps by breaking off base elements and isolating essential key features into self-contained, independent modules, with all the difficulties that this entails and how you can avoid the common pain points and pitfalls.

Transcript

1. Preparing your app for Google Play Instant Droidcon London 2018 ashdavies.io - @askashdavies
5. !
7. ! Friction
10. !
11. < />
14. Lollipop
16. <a href />
17. Try Now
18. <activity android:name="com.example.base.MainActivity" ... > <meta-data android:name="default-url" android:value="https://example.com/welcome" /> </activity>
19. Performance
20. Security
21. ! HTTPS
22. Smart Lock
23. Auth.CredentialsApi.save(mCredentialsClient, credential).setResultCallback( new ResultCallback() { @Override public void onResult(Status status) { if (status.isSuccess()) { // Credentials were saved } else { if (status.hasResolution()) { // Try to resolve the save request. This will prompt the user if // the credential is new. try { status.startResolutionForResult(this, RC_SAVE); } catch (IntentSender.SendIntentException e) { // Could not resolve the request } } } } });
24. ! Play Billing Library
25. ! Runtime Permissions
26. • ACCESS_COARSE_LOCATION • ACCESS_FINE_LOCATION • ACCESS_NETWORK_STATE • BILLING (Deprecated as of Play Billing Library 1.0) • CAMERA • INSTANT_APP_FOREGROUND_SERVICE (Only in Android Oreo) • INTERNET • READ_PHONE_NUMBERS (Only in Android Oreo) • RECORD_AUDIO • VIBRATE
27. Limitations
28. ! ⛏
29. Background Services
30. Push Notifications
31. External Storage
32. ! Local Storage
33. Instant <-> Installed
34. Cookie API
35. Size Limit (4 Mb)
36. Size Limit (4 Mb) (10 Mb)
39. The Monolith
40. Location Input
42. Dependency Graph
43. @Component
46. Flat Hierarchy
49. Dynamic Feature
51. Optimisations • Code minification (minifyEnabled) • Resource shrinking (shrinkResources) • Optimised SVG assets (bit.ly/2SeZePQ) • Configuration splits (splits { }) • Third party SDKs !
53. Proguard / R8
54. Third Party SDKs
55. Data Binding ! Error: Currently, data binding does not work for non-base feature modules. Please, move data binding code to the base feature module. See https://issuetracker.google.com/63814741 for details
56. Data Binding ! android.enableExperimentalFeatureDatabinding=true
57. Navigation Intent(context, CalculatorActivity::class.java)
58. Navigation Intent(context, CalculatorActivity::class.java)
59. App Links
60. <activity android:name=".calculator.CalculatorActivity"> <intent-filter> <action android:name="android.intent.action.VIEW"/> <category android:name="android.intent.category.DEFAULT"/> <category android:name="android.intent.category.BROWSABLE"/> <data android:host="www.immobilienscout24.de" android:path="/baufinanzierung/finanzierungsrechner/" android:scheme="https"/> </intent-filter> </activity>
61. <activity android:name=".calculator.CalculatorActivity"> <intent-filter> <action android:name="android.intent.action.VIEW"/> <category android:name="android.intent.category.DEFAULT"/> <category android:name="android.intent.category.BROWSABLE"/> <data android:host="www.immobilienscout24.de" android:path="/baufinanzierung/finanzierungsrechner/" android:scheme="https"/> </intent-filter> </activity>
62. Intent Extras val intent = Intent(context, CalculatorActivity::class.java) intent.putExtra("location", "Berlin")
63. ❗
64. Query Params intent.data?.getQueryParameter("location")
65. ?
66. Query Params val geocode = intent.data?.getQueryParameter("location") val label = intent.data?.getQueryParameter("label") val region = if (geocode != null && label != null) Region(geocode, label) else null
67. Query Params data class Region(val geocode: String, val label: String) { companion object { operator fun invoke( geocode: String?, label: String? ) : Region( geocode ?: "1276001010", label ?: "Berlin - Mitte (Mitte)" ) } }
68. Query Params val region = Region( intent.data?.getQueryParameter("location"), intent.data?.getQueryParameter("label") )
69. Verify Site Associations
70. keytool -list -v -keystore release.keystore
71. [{ "relation": ["delegate_permission/common.handle_all_urls"], "target": { "namespace": "android_app", "package_name": "de.is24.android", "sha256_cert_fingerprints": ["..."] } }]
73. Emulator Support
74. Topeka github.com/googlesamples/android-topeka
75. Plaid github.com/nickbutcher/plaid
76. Next Steps
77. Cheers! ! ashdavies.io - @askashdavies