Android Oreo Behind Scenes

My talk Mobile Day 2017, The goal is show the most relevant features of android oreo.

Transcript

1. Android·Oreo· Behind Scenes¬ What’s new in Android 8.0 for developers?, October 2017
2. Erik Jhordan Rey Android Software Engineer erik.gonzalez@schibsted.com @ErikJhordan_Rey github.com/erikcaffrey
3. https://goo.gl/viyxDx
4. Android Platform Summary¬
5. Official support of Kotlin on Android¬ Kotlin
6. Architecture Components ¬
7. Proprietary + Confidential Handling lifecycles Live Data View Models Rooms Android Architecture Components Kotlin
8. Sample¬
9. Github https://goo.gl/Wrd9qy Android Architecture Components
10. Android Studio 3 ¬
11. Android Studio 3.0 ¬
12. What's New in Android Oreo for Developers?
13. dependencies { implementation "com.android.support:appcompat-v7:27.0.0" }
14. Fonts ¬ Light 112 sp Regular 56 sp Thin 45 sp Bold 34 sp Mono 24 sp Black 20 sp
15. Fonts in·XML¬
16. Lets you use fonts as resources. You can add the font file in the res/font/ folder to bundle fonts as resources. These fonts are compiled in your R file and to access a font resource, use @font/myfont, or R.font.myfont.
17. Downloadable·Fonts¬
18. Introduce support for APIs to request fonts from a provider application. The Downloadable Fonts feature offers the following benefits: • Reduces the APK size • Increases the app installation success rate • Improves the overall system health as multiple APKs can share the same font through a provider.
19. A font provider is an application that retrieves fonts and caches them locally.
20. private fun getFontRequest(query: String) = FontRequest( Constants.PROVIDER_AUTHORITY, Constants.PROVIDER_PACKAGE, query, R.array.com_google_android_gms_fonts_certs) Font Request
21. Font Request Callback private fun getFontRequestCallback() = object : FontsContractCompat.FontRequestCallback() { override fun onTypefaceRetrieved(typeface: Typeface?) { super.onTypefaceRetrieved(typeface) text_font_disclaimer.typeface = typeface } override fun onTypefaceRequestFailed(reason: Int) { super.onTypefaceRequestFailed(reason) Log.e(FontsFragment::class.java.simpleName, "An Error Occurred: " + reason) } }
22. private fun getHandler(): Handler { val handlerThread = HandlerThread("fonts") handlerThread.start() return Handler(handlerThread.looper) } Handler
23. val fontRequest = getFontRequest(query) val fontRequestCallback = getFontRequestCallback() FontsContractCompat.requestFont(context!!, fontRequest, fontRequestCallback, getHandler()) Downloadable Font
24. Fonts • Downloadable Fonts XML • Downloadable Fonts Programmatically
25. Emoji · Compatibility ¬
26. EmojiCompat¬
27. The EmojiCompat support library aims to keep Android devices up to date with the latest emoji. • Prevents your app from showing missing emoji characters in the form of ☐ • Your app users do not need to wait for Android OS updates to get the latest emoji
28. EmojiCompat identifies emoji for a given CharSequence, replaces them with EmojiSpans, if required, and finally renders the emoji glyphs. Note: backward-compatible emoji support on devices running Android 4.4 (API level 19) and higher
29. dependencies { implementation "com.android.support:support-emoji:$version" }
30. <android.support.text.emoji.widget.EmojiTextView android:layout_width="wrap_content" android:layout_height="wrap_content"/> <android.support.text.emoji.widget.EmojiEditText android:layout_width="wrap_content" android:layout_height="wrap_content"/> <android.support.text.emoji.widget.EmojiButton android:layout_width="wrap_content" android:layout_height="wrap_content"/> Support Emoji
31. dependencies { implementation "com.android.support:support-emoji-appcompat:$version" }
32. <android.support.text.emoji.widget.EmojiAppCompatTextView android:layout_width="wrap_content" android:layout_height="wrap_content"/> <android.support.text.emoji.widget.EmojiAppCompatEditText android:layout_width="wrap_content" android:layout_height="wrap_content"/> <android.support.text.emoji.widget.EmojiAppCompatButton android:layout_width="wrap_content" android:layout_height="wrap_content"/> Support Emoji AppCompat
33. EmojiCompat Regular Widgets Use EmojiCompat.get().process(text) to add EmojiSpans if any emoji are found. The code above should be inside of an implementation of InitCallback. Listen the initialization of EmojiCompat EmojiCompat.get().registerInitCallback(initCallback)
34. class EmojiTextViewCallback constructor(regularTextView: TextView, val text: String) : EmojiCompat.InitCallback() { private val regularTextViewReference: WeakReference<TextView> = WeakReference(regularTextView) override fun onInitialized() { super.onInitialized() val regularTextView = regularTextViewReference.get() regularTextView!!.text = EmojiCompat.get().process(text) } override fun onFailed(throwable: Throwable?) { super.onFailed(throwable) throwable!!.printStackTrace() } } EmojiTextViewCallback
35. val emojiTextViewCallback = EmojiTextViewCallback(text_emoji_regular, getString(R.string.emoji_regular_text, MONKEYS_EMOJI)) EmojiCompat.get().registerInitCallback(emojiTextViewCallback) Using EmojiTextViewCallback
36. Using EmojiCompat with custom widgets EmojiTextViewHelper EmojiEditTextHelper CustomEmojiTextView.kt
37. Emoji Bundled· or downloadable¬
38. Downloadable fonts The downloadable fonts configuration uses the Downloadable Fonts support library feature to download an emoji font Bundled fonts This package includes the font with the embedded metadata
39. dependencies { implementation "com.android.support:support-emoji-bundled:$version" }
40. class YourApplication : Application() { override fun onCreate() { super.onCreate() val config: EmojiCompat.Config if (Constants.ENABLE_BUNDLED_EMOJI) { // bundled config = BundledEmojiCompatConfig(applicationContext) } else { // downloadable val fontRequest = FontRequest( Constants.PROVIDER_AUTHORITY, Constants.PROVIDER_PACKAGE, Constants.FONT_QUERY, R.array.com_google_android_gms_fonts_certs) config = FontRequestEmojiCompatConfig(this, fontRequest) .setReplaceAll(true) .setEmojiSpanIndicatorEnabled(false) .setEmojiSpanIndicatorColor(Color.MAGENTA) } EmojiCompat.init(config) } } Using EmojiCompat Bundled or Downloadable
41. EmojiCompat • EmojiAppCompatEditText • EmojiAppCompatTextView • EmojiAppCompatButton • EmojiRegular • EmojiCustomView
42. TextVie W auto- sizing TextView regular Autosizing TextView ¬
43. Allows you to instruct a TextView to let the text size expand or contract automatically to fill its layout based on the TextView's characteristics and boundaries. Autosizing There are three ways you can set up the autosizing of TextView: • Default • Granularity • Preset Sizes Note: The library provides support to Android 4.0 (API level 14) and higher. The android.support.v4.widget package contains the TextViewCompat.
44. Default¬
45. Default setting lets the autosizing of TextView scale uniformly on horizontal and vertical axes. <android.support.v7.widget.AppCompatTextView android:id="@+id/text_default" android:layout_width="match_parent" android:layout_height="100dp" android:text="@string/autosizing_default_disclaimer" app:autoSizeTextType="uniform"/> Default Provide AUTO_SIZE_TEXT_TYPE_NONE to turn off the autosizing feature or AUTO_SIZE_TEXT_TYPE_UNIFORM to scale the horizontal and the vertical axes uniformly.
46. Granularity¬
47. You can define a range of minimum and maximum text sizes and a dimension that specifies the size of each step. The TextView scales uniformly in a range between the minimum and maximum size attributes. Each increment occurs as per the step size set in the granularity attribute. <android.support.v7.widget.AppCompatTextView android:id="@+id/text_default" android:layout_width="match_parent" android:layout_height="100dp" android:text="@string/autosizing_granularity_disclaimer" app:autoSizeMaxTextSize="34sp" app:autoSizeMinTextSize="10sp" app:autoSizeStepGranularity="2sp" app:autoSizeTextType="uniform"/> Granularity
48. Preset Sizes¬
49. Preset sizes lets you specify all the values that the TextView picks when automatically auto-sizing text. <android.support.v7.widget.AppCompatTextView android:id="@+id/text_default" android:layout_width="match_parent" android:layout_height="100dp" android:text="@string/autosizing_preset_sizes_disclaimer" app:autoSizePresetSizes="@array/autosize_text_sizes" app:autoSizeTextType="uniform"/> Preset Sizes <array name="autosize_text_sizes"> <item>10sp</item> <item>12sp</item> <item>20sp</item> <item>40sp</item> <item>100sp</item> </array>
50. AutoSizingExt¬ Kotlin Extension to facilitate the usage of AutoSizing on AppCompatTextView AutoSizingExt.kt
51. Autosizing TextView • Default • Granularity • Preset Size
52. Adaptive Icons
53. Adaptive launcher icons, which can display a variety of shapes across different device models. You can control the look of your adaptive launcher icon by defining 2 layers, consisting of a background and a foreground. You must provide icon layers as drawables without masks or background shadows around the outline of the icon. Adaptive Icons
54. <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android"> <background android:drawable="@drawable/ic_launcher_background" /> <foreground android:drawable="@mipmap/ic_launcher_foreground" /> </adaptive-icon> <application… android:icon="@mipmap/ic_launcher" android:roundIcon="@mipmap/ic_launcher_round" …> </application> Adaptive Icons res/mipmap-anydpi-v26
55. Adaptive Icon
56. Picture-in-Picture
57. Picture in Picture· Support¬
58. As of Android O, activities can launch in Picture-in-Picture (PiP) mode. PiP is a special type of multi-window mode <activity android:name=".home.HomeActivity" android:label="@string/app_name" android:supportsPictureInPicture="true"> … </activity> Picture in Picture
59. private fun setPictureInPicture() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { val pictureInPictureParamsBuilder = PictureInPictureParams.Builder() val aspectRatio = Rational(1200, 600) pictureInPictureParamsBuilder.setAspectRatio(aspectRatio).build() enterPictureInPictureMode(pictureInPictureParamsBuilder.build()) } } Picture in Picture Mode
60. Handling UI during Picture in Picture override fun onPictureInPictureModeChanged(isInPictureInPictureMode: Boolean, newConfig: Configuration?) { super.onPictureInPictureModeChanged(isInPictureInPictureMode, newConfig) if (isInPictureInPictureMode) { println("Picture-in-picture mode") } else { println("Restore the full-screen UI") } }
61. Picture-in-Picture
62. Publishing apps that target API 27 ¬
63. • You want to target API level 27, you’ll need to support the behavior changes introduced in Android 8.0 Oreo, such as background execution limits, location limits, and others. • Once you publish an app with targetSdkVersion set to 23 or higher, you can't later publish a version of the app with a higher versionCode that targets 22 or lower. Google Play that target API level 27
64. Android Oreo ¬ https://developer.android.com/about/versions/oreo/index.html
65. Sample¬
66. Android Oreo Github https://goo.gl/4XSPGT
67. https://speakerdeck.com/erikcaffrey
68. Questions? Find me github.com/erikcaffrey erik.gonzalez@schibsted.com erikcaffrey.github.io @ErikJhordan_Rey +Erik Jhordan Rey
69. Thank You · Mobile Day ¬