Fantastic API and where to find them

Slides of the talk I kept at:
- Mobile Z Days 2020 Online
- DevFest Italy 2020 Online

1. Fantastic API And where to Find them
2. Application Programming Interface
3. Should we request it? Request it! Do we have it? Permissions Can we handle the result? Do what we need!
4. Should we request it? Request it! Do we have it? More permissions! Can we handle the result? Do what we need! INSERT COMPLICATED LOGIC HERE
5. ActivityResultContract
6. Show me the code implementation 'androidx.activity:activity-ktx:1.2.0-alpha08' implementation 'androidx.fragment:fragment-ktx:1.3.0-alpha08'
7. Show me the code private val requestPermissionsContracts = registerForActivityResult( ActivityResultContracts.RequestMultiplePermissions() ) { permissions -> permissions.entries.forEach { if (it.key.contains("FINE")) { /** DO THINGS **/ } else { /** DO THINGS **/ } } }
8. Show me the code private val requestPermissionsContracts = registerForActivityResult( ActivityResultContracts.RequestMultiplePermissions() ) { permissions -> permissions.entries.forEach { if (it.key.contains("FINE")) { /** DO THINGS **/ } else { /** DO THINGS **/ } } }
9. Show me the code private val wantedPermissions = arrayOf( Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION )
10. Show me the code requestPermissionsContracts.launch( wantedPermissions )
11. Show me the code requestPermissionsContracts.launch(wantedPermissions)
12. Show me the code class CustomContract : ActivityResultContract<Int, Boolean>() { override fun createIntent( context: Context, input: Int): Intent override fun parseResult( resultCode: Int, intent: Intent?): Boolean }
13. Pick a contact Contacts Get content (or more), create or open a document, open multiple documents or a document tree Content Start Activities or Intent Senders for result System Take a picture, a preview, or a video Multimedia Request one or more permissions Permissions More use cases
14. What if I wanted to know what app my user selected?
15. IntentSender
16. Intent To wire the Receiver Pending Intent Create the IntentSender Broadcast Receiver Receives the result How does it work?
17. Show me the code class ShareComponentReceiver : BroadcastReceiver() { override fun onReceive( context: Context, intent: Intent ) { val chosenApp = intent.extras ?.get(EXTRA_CHOSEN_COMPONENT) .toString() } }
18. Show me the code class ShareComponentReceiver : BroadcastReceiver() { override fun onReceive( context: Context, intent: Intent ) { val chosenApp = intent.extras ?.get(EXTRA_CHOSEN_COMPONENT) .toString() } }
19. Show me the code private fun shareIntent() = Intent().apply { action = Intent.ACTION_SEND putExtra(Intent.EXTRA_TEXT, "Sample text to share!") type = "text/plain" }
20. Show me the code private fun intentSender(): IntentSender { val receiverIntent = Intent( this, ShareComponentReceiver::class.java ) val pendingIntent = PendingIntent.getBroadcast( this, 0, receiverIntent, PendingIntent.FLAG_UPDATE_CURRENT ) return pendingIntent.intentSender }
21. Show me the code startActivity( Intent.createChooser( shareIntent(), "Share!", intentSender() ) )
22. The old way connectivityManager .activeNetworkInfo ?.isConnectedOrConnecting
23. Network stuff has been DEPRECATED!!1!one!
24. Network Request It holds the requirements Network Callback We still want to know the info Connectivity Manager We still need it The new way
25. Show me the code val specifier = WifiNetworkSpecifier.Builder() .setSsid(wiFiData.ssid) .setWpa2Passphrase(wiFiData.password) .build()
26. Show me the code val networkRequest = NetworkRequest.Builder() .addTransportType(NetworkCapabilities.TRANSPORT_WIFI) .removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) .setNetworkSpecifier(specifier) .build()
27. Show me the code val networkRequest = NetworkRequest.Builder() .addTransportType(NetworkCapabilities.TRANSPORT_WIFI) .removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) .setNetworkSpecifier(specifier) .build()
28. Show me the code private fun networkCallback() = object : ConnectivityManager.NetworkCallback() { override fun onAvailable(network: Network) { /** DO THINGS **/ } override fun onUnavailable() { /** DO THINGS **/ } }
29. Show me the code connectivityManager.requestNetwork( networkRequest, networkCallback() )
30. I want to do magic when Fragments are created! NOW AVAILABLE
31. Show me the code class LifecycleListener : FragmentManager.FragmentLifecycleCallbacks() { override fun onFragmentViewCreated( fm: FragmentManager, f: Fragment, v: View, savedInstanceState: Bundle? ) { } override fun onFragmentCreated( fm: FragmentManager, f: Fragment, savedInstanceState: Bundle? ) { }
32. Show me the code savedInstanceState: Bundle? ) { } override fun onFragmentCreated( fm: FragmentManager, f: Fragment, savedInstanceState: Bundle? ) { } override fun onFragmentDestroyed( fm: FragmentManager, f: Fragment ) { } override fun onFragmentViewDestroyed( fm: FragmentManager, f: Fragment ) { } }
33. Show me the code class LifecycleListener : FragmentManager.FragmentLifecycleCallbacks() { override fun onFragmentViewCreated( fm: FragmentManager, f: Fragment, v: View, savedInstanceState: Bundle? ) { } override fun onFragmentCreated( fm: FragmentManager, f: Fragment, savedInstanceState: Bundle? ) { } override fun onFragmentDestroyed( fm: FragmentManager, f: Fragment ) { } override fun onFragmentViewDestroyed( fm: FragmentManager, f: Fragment ) { } }
34. Show me the code val callbacks = LifecycleListener() supportFragmentManager .registerFragmentLifecycleCallbacks(callbacks, true) supportFragmentManager .unregisterFragmentLifecycleCallbacks(callbacks)
35. Authenticate your users
36. Create UI info Manage callbacks Can use biometric HW? Authentication Create prompt Authenticate!
37. Show me the code implementation "androidx.biometric:biometric:1.0.1"
38. Show me the code val biometricManager = BiometricManager.from(this) when (biometricManager.canAuthenticate()) { BiometricManager.BIOMETRIC_SUCCESS -> /** DO THINGS **/ BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE, BiometricManager.BIOMETRIC_ERROR_HW_UNAVAILABLE, BiometricManager.BIOMETRIC_ERROR_NONE_ENROLLED -> /** ERROR **/ }
39. Show me the code fun buildPromptInfo() = BiometricPrompt.PromptInfo .Builder() .setTitle("Biometric authentication sample.") .setSubtitle("I'm a subtitle.") .setDescription("I'm a description") .setNegativeButtonText("Cancel") .build()
40. Show me the code fun callback() = object : BiometricPrompt.AuthenticationCallback() { override fun onAuthenticationError(errorCode: Int, errString: CharSequence) { /** DO THINGS **/ } override fun onAuthenticationSucceeded(result: AuthenticationResult) { /** DO THINGS **/ } override fun onAuthenticationFailed() { /** DO THINGS **/ } }
41. Show me the code val biometricPrompt = BiometricPrompt( activity, executor, callback())
42. Show me the code biometricPrompt.authenticate(buildPromptInfo())
43. Hello! I Am Rob Follow me at @_tiwiz
44. Q&A