Fantastic API and where to find them

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

Transcript

1. Fantastic API
   And where to
   Find them
   

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2. Application
   
   Programming
   
   Interface
   

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3. Should we request it? Request it!
   Do we have it?
   Permissions
   Can we handle the
   result?
   Do what we need!
   

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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
   

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5. ActivityResultContract
   

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6. Show me the code
   implementation 'androidx.activity:activity-ktx:1.2.0-alpha08'
   implementation 'androidx.fragment:fragment-ktx:1.3.0-alpha08'
   

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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 **/
   }
   }
   }
   

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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 **/
   }
   }
   }
   

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9. Show me the code
   private val wantedPermissions = arrayOf(
   Manifest.permission.ACCESS_COARSE_LOCATION,
   Manifest.permission.ACCESS_FINE_LOCATION
   )
   

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10. Show me the code
    requestPermissionsContracts.launch( wantedPermissions )
    

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11. Show me the code
    requestPermissionsContracts.launch(wantedPermissions)
    

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12. Show me the code
    class CustomContract :
    ActivityResultContract() {
    override fun createIntent(
    context: Context,
    input: Int): Intent
    override fun parseResult(
    resultCode: Int,
    intent: Intent?): Boolean
    }
    

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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
    

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14. What if I wanted
    to know
    what app my user selected?
    

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15. IntentSender
    

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16. Intent
    To wire the Receiver
    Pending
    
    Intent
    Create the
    IntentSender
    Broadcast
    
    Receiver
    Receives the result
    How does it work?
    

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17. Show me the code
    class ShareComponentReceiver : BroadcastReceiver() {
    override fun onReceive(
    context: Context,
    intent: Intent
    ) {
    val chosenApp = intent.extras
    ?.get(EXTRA_CHOSEN_COMPONENT)
    .toString()
    }
    }
    

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18. Show me the code
    class ShareComponentReceiver : BroadcastReceiver() {
    override fun onReceive(
    context: Context,
    intent: Intent
    ) {
    val chosenApp = intent.extras
    ?.get(EXTRA_CHOSEN_COMPONENT)
    .toString()
    }
    }
    

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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"
    }
    

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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
    }
    

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21. Show me the code
    startActivity(
    Intent.createChooser(
    shareIntent(),
    "Share!",
    intentSender()
    )
    )
    

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22. The old way
    connectivityManager
    .activeNetworkInfo
    ?.isConnectedOrConnecting
    

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23. Network stuff
    has been
    DEPRECATED!!1!one!
    

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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
    

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25. Show me the code
    val specifier = WifiNetworkSpecifier.Builder()
    .setSsid(wiFiData.ssid)
    .setWpa2Passphrase(wiFiData.password)
    .build()
    

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26. Show me the code
    val networkRequest = NetworkRequest.Builder()
    .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
    .removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
    .setNetworkSpecifier(specifier)
    .build()
    

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27. Show me the code
    val networkRequest = NetworkRequest.Builder()
    .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
    .removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
    .setNetworkSpecifier(specifier)
    .build()
    

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28. Show me the code
    private fun networkCallback() =
    object : ConnectivityManager.NetworkCallback() {
    override fun onAvailable(network: Network) {
    /** DO THINGS **/
    }
    override fun onUnavailable() {
    /** DO THINGS **/
    }
    }
    

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29. Show me the code
    connectivityManager.requestNetwork(
    networkRequest,
    networkCallback()
    )
    

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30. I want to do magic
    when Fragments
    are created!
    NOW
    AVAILABLE
    

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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?
    ) {
    }
    

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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
    ) {
    }
    }
    

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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
    ) {
    }
    }
    

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34. Show me the code
    val callbacks = LifecycleListener()
    supportFragmentManager
    .registerFragmentLifecycleCallbacks(callbacks, true)
    supportFragmentManager
    .unregisterFragmentLifecycleCallbacks(callbacks)
    

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35. Authenticate
    your
    users
    

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36. Create UI info Manage callbacks
    Can use biometric
    HW?
    Authentication
    Create prompt
    Authenticate!
    

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37. Show me the code
    implementation "androidx.biometric:biometric:1.0.1"
    

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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 **/
    }
    

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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()
    

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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 **/
    }
    }
    

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41. Show me the code
    val biometricPrompt = BiometricPrompt(
    activity,
    executor,
    callback())
    

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42. Show me the code
    biometricPrompt.authenticate(buildPromptInfo())
    

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43. Hello!
    I Am Rob
    Follow me at @_tiwiz
    

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44. Q&A
    

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