This slide deck contains an overview of the new Android 11 UI features and development tools using content provided by Google.

1. GDG Location
What’s new in
Android

2. GDG Location
So… what is new?
What’s new about What’s New in Android?
Android 11
Tools
Libraries

3. GDG Location
UI

4. GDG Location
Window Insets
● More information about the multiple types of content
being displayed
APP
Status
Navigation IME

5. GDG Location
WindowInsets
// get WindowInsets object from listener
view.setOnApplyWindowInsetsListener { view, insets ->
}

6. GDG Location
WindowInsets
// get WindowInsets object from listener
view.setOnApplyWindowInsetsListener { view, insets ->
// See if the IME is visible
val imeVisible = insets.isVisible((WindowInsets.Type.ime()))
}

7. GDG Location
WindowInsets
// get WindowInsets object from listener
view.setOnApplyWindowInsetsListener { view, insets ->
// See if the IME is visible
val imeVisible = insets.isVisible((WindowInsets.Type.ime()))
if (imeVisible) {
val imeInsets = insets.getInsets(WindowInsets.Type.ime())
// ...
}
}

8. GDG Location
IME Animations
● Synchronize keyboard animations
with app content changes
○ Listen for changes
■ AND/OR
○ Drive keyboard animation
directly

9. GDG Location
IME Animations

10. GDG Location
editText.setWindowInsetsAnimationCallback(animCallback)
val animCallback = object : WindowInsetsAnimation.Callback(DISPATCH_MODE_STOP) {
override fun onProgress(p0: WindowInsets, p1: MutableList<WindowInsetsAnimation>
): WindowInsets {
...
}
// Optional overrides
override fun onPrepare(animation: WindowInsetsAnimation) { ... }
override fun onEnd(animation: WindowInsetsAnimation) { ... }
override fun onStart(animation: WindowInsetsAnimation,
bounds: WindowInsetsAnimation.Bounds
): WindowInsetsAnimation.Bounds { ... }
}
IME Animations
Listening for keyboard changes

11. GDG Location
IME Animations
editText.windowInsetsController?.
controlWindowInsetsAnimation(
WindowInsets.Type.ime(), /* animate the keyboard */
-1, /* infinite duration */
linearInterpolator, /* linear motion */
cancellationSignal, /* allows cancellation */
animationControlListener /* ready/cancelled/finished */
)
Animating the keyboard directly

12. GDG Location
WindowInsetsAnimation app:
goo.gle/insetsanimsample

13. GDG Location
Conversations

14. GDG Location
Conversations
// Create and post shortcut
val person = Person.Builder().build()

15. GDG Location
Conversations
// Create and post shortcut
val person = Person.Builder().build()
val shortcutInfo = ShortcutInfoCompat.Builder(this, "sampleShortcut").
setPerson(person).
setLongLived(true).
// ...
build()

16. GDG Location
Conversations
// Create and post shortcut
val person = Person.Builder().build()
val shortcutInfo = ShortcutInfoCompat.Builder(this, "sampleShortcut").
setPerson(person).
setLongLived(true).
// ...
build()
ShortcutManagerCompat.pushDynamicShortcut(shortcutInfo)

17. GDG Location
Conversations
// Create and post shortcut
val person = Person.Builder().build()
val shortcutInfo = ShortcutInfoCompat.Builder(this, "sampleShortcut").
setPerson(person).
setLongLived(true).
// ...
build()
ShortcutManagerCompat.pushDynamicShortcut(shortcutInfo)
// Create notification with shortcut
val style = NotificationCompat.MessagingStyle(person).
addMessage(...).
// ...

18. GDG Location
Conversations
// Create and post shortcut
val person = Person.Builder().build()
val shortcutInfo = ShortcutInfoCompat.Builder(this, "sampleShortcut").
setPerson(person).
setLongLived(true).
// ...
build()
ShortcutManagerCompat.pushDynamicShortcut(shortcutInfo)
// Create notification with shortcut
val style = NotificationCompat.MessagingStyle(person).
addMessage(...).
// ...
NotificationCompat.Builder(this, "foo").
setShortcutId(shortcutInfo.id).
// ...
build()

19. GDG Location
Bubbles

20. GDG Location
Bubbles
● Notifications that can also show as bubbles
● Android 10: Developer option
○ Android 11: They’re here!
● Better than System Alert Window!
● Created with Notification API
○ with more metadata
○ and dedicated activity

21. GDG Location
Bubbles: Manifest
Manifest:
<activity
android:name=".bubbles.BubbleActivity"
android:theme="@style/AppTheme.NoActionBar"
android:label="@string/title_activity_bubble"
android:resizeableActivity="true"
/>

22. GDG Location
Bubbles: Code
// Create Intent to launch
val intent = Intent(context, BubbleActivity::class.java)
val bubbleIntent = PendingIntent.getActivity(context, 0, intent,...)

23. GDG Location
Bubbles: Code
// Create Intent to launch
val intent = Intent(context, BubbleActivity::class.java)
val bubbleIntent = PendingIntent.getActivity(context, 0, intent,...)
// Create metadata
val shortcutInfo = ... /* probably already using for notifications */
val bubbleMetadata = Notification.BubbleMetadata.Builder(shortcutInfo.id)

24. GDG Location
Bubbles: Code
// Create Intent to launch
val intent = Intent(context, BubbleActivity::class.java)
val bubbleIntent = PendingIntent.getActivity(context, 0, intent,...)
// Create metadata
val shortcutInfo = ... /* probably already using for notifications */
val bubbleMetadata = Notification.BubbleMetadata.Builder(shortcutInfo.id)
// Create Notification with metadata
val builder: Notification.Builder =
Notification.Builder(context, CHANNEL_ID)
// ...
.setBubbleMetadata(bubbleMetadata)
.setCategory(...)
.setShortcutId(...)

25. GDG Location
What’s new in System UI
Android Samples on Github:
user-interface-samples/People
140: Bubbles!
141: Discussing
Conversations

26. GDG Location
Developer Goodies

27. GDG Location
Wi-Fi Debugging
Because there are never enough USB ports

28. GDG Location
Wi-Fi Debugging
Because there are never enough USB ports

29. GDG Location
Nullability Annotations
● @RecentlyNullable, @RecentlyNonNull
○ Warnings
● @Nullable, @NonNull
○ Errors

30. GDG Location
Crash Reasons
Reporting
● API to query why your app crashed
○ Upload reports

31. GDG Location
Crash Reasons Querying
// Returns List of ApplicationExitInfo
val reasonsList = activityManager.getHistoricalProcessExitReasons(
packageName, pid /* 0 for all matches */, max /* 0 for all */)

32. GDG Location
Crash Reasons Querying
// Returns List of ApplicationExitInfo
val reasonsList = activityManager.getHistoricalProcessExitReasons(
packageName, pid /* 0 for all matches */, max /* 0 for all */)
for (info in reasonsList) {
// Log/store/upload info.reason
// REASON_LOW_MEMORY, REASON_CRASH, REASON_ANR, etc.
}

33. GDG Location
● Android 10: HWASan
○ Memory issue debugging
● GWP-ASan
○ Catches memory issues (for native apps)
○ On user devices in the field
○ Low overhead (runtime and memory)
○ Reports uploaded to Play dashboard
GWP-ASan

34. GDG Location
GWP-ASan
<application android:gwpAsanMode="always">
...
</application>

35. GDG Location
GWP-ASan
<application android:gwpAsanMode="always">
...
</application>
// Bad memory access caught by GWP-ASan triggers exit + report
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
Build fingerprint: 'google/sargo/sargo:10/RPP3.200320.009/6360804:userdebug/dev-keys'
Revision: 'PVT1.0'
ABI: 'arm64'
Timestamp: 2020-04-06 18:27:08-0700
pid: 16227, tid: 16227, name: 11.test.gwpasan >>> android11.test.gwpasan <<<
uid: 10238
signal 11 (SIGSEGV), code 2 (SEGV_ACCERR), fault addr 0x736ad4afe0
Cause: [GWP-ASan]: Use After Free on a 32-byte allocation at 0x736ad4afe0
backtrace:
#00 pc 000000000037a090 /apex/com.android.art/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckNonHeapValue(char, art::(anonymous namespace)::JniValueType)+448)
#01 pc 0000000000378440 /apex/com.android.art/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::CheckPossibleHeapValue(art::ScopedObjectAccess&, char, art::(anonymous namespace)::JniValueType)+204)
#02 pc 0000000000377bec /apex/com.android.art/lib64/libart.so (art::(anonymous namespace)::ScopedCheck::Check(art::ScopedObjectAccess&, bool, char const*, art::(anonymous namespace)::JniValueType*)+612)
#03 pc 000000000036dcf4 /apex/com.android.art/lib64/libart.so (art::(anonymous namespace)::CheckJNI::NewStringUTF(_JNIEnv*, char const*)+708)
#04 pc 000000000000eda4 /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (_JNIEnv::NewStringUTF(char const*)+40)
#05 pc 000000000000eab8 /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (native_get_string(_JNIEnv*)+144)
#06 pc 000000000000edf8 /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (Java_android11_test_gwpasan_MainActivity_nativeGetString+44)
...
deallocated by thread 16227:
#00 pc 0000000000048970 /apex/com.android.runtime/lib64/bionic/libc.so (gwp_asan::AllocationMetadata::CallSiteInfo::RecordBacktrace(unsigned long (*)(unsigned long*, unsigned long))+80)
#01 pc 0000000000048f30 /apex/com.android.runtime/lib64/bionic/libc.so (gwp_asan::GuardedPoolAllocator::deallocate(void*)+184)
#02 pc 000000000000f130 /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (std::__ndk1::_DeallocateCaller::__do_call(void*)+20)
...
#08 pc 000000000000ed6c /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> >::~basic_string()+100)
#09 pc 000000000000ea90 /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (native_get_string(_JNIEnv*)+104)
#10 pc 000000000000edf8 /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (Java_android11_test_gwpasan_MainActivity_nativeGetString+44)
...
allocated by thread 16227:
#00 pc 0000000000048970 /apex/com.android.runtime/lib64/bionic/libc.so (gwp_asan::AllocationMetadata::CallSiteInfo::RecordBacktrace(unsigned long (*)(unsigned long*, unsigned long))+80)
#01 pc 0000000000048e4c /apex/com.android.runtime/lib64/bionic/libc.so (gwp_asan::GuardedPoolAllocator::allocate(unsigned long)+368)
#02 pc 000000000003b258 /apex/com.android.runtime/lib64/bionic/libc.so (gwp_asan_malloc(unsigned long)+132)
#03 pc 000000000003bbec /apex/com.android.runtime/lib64/bionic/libc.so (malloc+76)
#04 pc 0000000000010414 /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (operator new(unsigned long)+24)
...
#10 pc 000000000000ea6c /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (native_get_string(_JNIEnv*)+68)
#11 pc 000000000000edf8 /data/app/android11.test.gwpasan/lib/arm64/libmy-test.so (Java_android11_test_gwpasan_MainActivity_nativeGetString+44)
...

36. GDG Location
ADB Incremental
● Faster installs via command-line
● For huge APKs (think: games)
● Up to 10x faster

37. GDG Location
ADB Incremental
● Faster installs via command-line
● For huge APKs (think: games)
● Up to 10x faster
adb
adb incremental
playable
Avg time (in seconds)
68.8 s
0.29 s
Unity Megacity demo
3.5 GB, Pixel 4, USB 3.0
adb incremental
fully installed
7.6 s
Source: Google data

38. GDG Location
ADB Incremental
// First: sign APK, create APK Signature Scheme v4 file
// Then, run ADB incremental
$ adb install --incremental

39. GDG Location
Behavior Changes
● Most changes limited to targetSdk R
● Test changes with behavior toggles
○ Command-line
○ New Developer Options panel

40. GDG Location
Toggling Behavior Changes
// adb shell am compat (enable|disable) (CHANGE_ID|CHANGE_NAME)
PACKAGE_NAME
$ adb shell am compat disable DEFAULT_SCOPED_STORAGE
com.android.samples.android11playground

41. GDG Location
For More Information
Launch videos
11 Weeks of Android
Android 11 Meetups
Now in Android
goo.gle/android11
d.android.com/11weeksofandroid
d.android.com/android11/meetups
d.android.com/series/now-in-android

42. Thank you!