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Release Updates

Emulator 29.0.1 Canary

Friday, April 5, 2019

Android Q Beta 2: Foldable Hardware ProfilesAndroid Q Beta 2Android Studio 3.5 Canary 10

7.3” Foldable: 1536x2152 & folded: 4.6” 840x1960
8” Foldable: 2200x2480 & folded: 6.6” 1480x2480

Please ensure you have the latest (rev 2+) version of Android Q system images along with Android Studio 3.5 Canary 10+, as foldable UI will not work properly with earlier versions.

Foldable hardware profiles can be selected in the AVD manager in Studio 3.5 Canary 10+:

A new panel is added to the left side of the emulator UI allowing control of whether the device is in folded or unfolded state. The panel itself can be toggled on and off in Extended Controls > Settings.

Android Q Beta 2: Vulkan 1.0 (Windows, Linux)
If you are using a Windows or Linux machine with a modern GPU (Intel HD 5xx+, AMD 4xx+/Vega, NVIDIA GTX 5xx+) , the Q Beta 2 system image supports running Vulkan 1.0 apps. This is currently a rough, experimental level of support where snapshots and Android Vulkan UI are not supported yet, but allows testing individual Android Vulkan apps. To enable, add the following lines to ~/.android/advancedFeatures.ini:

Vulkan = on GLDirectMem = on

In a future Android Q system image update, Vulkan 1.1 will be supported (the host side emulator bits in 29.0.x already support Vulkan 1.1), and we will also support running the Android UI renderer (Skia) on Vulkan backend for GPUs that have the OpenGL/Vulkan interop extension GL_EXT_memory_object (Most AMD/NVIDIA GPUs, but not Intel).

Known issue: HAXM can sometimes fail to map Vulkan coherent memory to the guest and shuts down the emulator. This will be addressed in an upcoming HAXM update.

The following are changes specific to the emulator that are independent of Q system images:
Linux: Packaging more shared libraries
The headless build of the emulator allows running the emulator on a wide variety of Linux systems, but even with the non-headless (headful?) build of the emulator, we're still working to make sure the Linux emulator can run on a wide variety of systems. In 29.0.1, we now also package libxkbcommon.so with the Linux emulator. This allows the emulator to run on a wider variety of Linux systems.
If the emulator does not launch for you on Linux, please try to run it from the command line with -verbose -no-snapshot and having the environment variable LD_DEBUG=all set, and file a report in Issuetracker so we can add any other shared libraries that might be missing (or fix the issue if it's not because of missing shared libraries).
Foldable UI improvements

Fixed issue where foldable hardware profile AVD was created, but foldable UI did not show up by default.
Fixed issue where left side panel would disappear when restoring the emulator from a minimized state.
Corrected button help string for the fold button in the left panel.
Fixed tooltip for the fold button.
Added keyboard shortcuts to fold and unfold:

Ctrl (Command on macOS) + F: Fold
Ctrl (Command on macOS) + U: Unfold

AR Macro UI improvements

Fixed issue where video would sometimes keep playing if the selected macro was changed.
Improved the UI layout.

Other Changes

Fixed issue where on older API levels (< 26), the screen would turn off unexpectedly. This was due to setting the emulator on battery power, but the adb command to set screen off timeout did not go through reliably on these system images.
Fixed issue where -partition-size command line option would not set the data partition size even after -wipe-data.
glReadPixels GL_IMPLEMENTATION_COLOR_READ_TYPE will now use the host GPU's result instead of an emulated one, which can fix issues with images/assets not showing up because of improper format for readback. More details
We no longer use Qt libraries to get the monitor dimensions as it is unreliable. Instead, we use the platform's native windowing libraries to do so.
Because Android Q seems to require much more RAM in the device compared to previous Android versions, we've bumped up the minimum RAM size for Android Q to 2 GB. Note that this is still not enough to keep lowmemorykiller from tripping (4 GB is needed to avoid lowmemorykiller events) but is a compromise between the emulator itself becoming extremely slow due to low RAM versus the host system running out of RAM (which is worse).

Edit: This may be improved in the future with compressed RAM enabled for the emulator.

Fixed issue where Vulkan loader was not packaged with the Linux emulator.
AR Macro UI now sends metrics on usage if user has opted in to metrics from Studio.
Fixed possible concurrency issue when copy/pasting text into the emulator.
Fixed possible concurrency issue when querying GL strings.

ConstraintLayout 2.0.0 alpha 4

Thursday, April 4, 2019

We just released ConstraintLayout 2.0.0 alpha 4. It’s available from the google maven repository:

dependencies {

implementation 'com.android.support.constraint:constraint-layout:2.0.0-alpha4'

}

or if using the AndroidX packages:

dependencies {

implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha4'

}

Documentation is available on https://developer.android.com/reference/android/support/constraint/classes.html

Changes

This release contains various bug fixes and performance improvements:

ConstraintLayout

Dynamic feature modules fix when using barriers and helpers
Chain fixes (bias with gone elements, RTL fixes)
Barrier fixes (RTL behavior, now can use a margin on a Barrier)
match_constraints fixes (max support, bias, percent…)
setTag/getTag on Group was fixed
ConstraintSet::setGoneMargin() for Top/Bottom
baseline behavior on gone
wrap behavior fixes

MotionLayout

Visibility fixes
Flickering issues / jump issues fixed
Various match_constraints issues fixed
Custom color interpolation (alpha was incorrectly handled)
Better barrier / helpers support

New Features

We also added several new features to MotionLayout:

Richer behaviors for OnClick actions
CustomAttributes support for customPixelDimensions
ImageFilterView overlay support
KeyTrigger collision support
Attributes rename

OnClick

OnClick now supports a richer set of behaviours

Toggle - animate back and forth ( = transitionToEnd|transitionToStart)
transitionToEnd - animate to the end state
transitionToStart - animate to the start state
jumpToEnd - Jump to the end state
jumpToStart - Jump to the start state

These can be combined to allow jumping to the end but smooth transition to the start.

<OnClick motion:targetId="@id/button_west"

motion:clickAction="transitionToEnd|transitionToStart"/>

<OnClick motion:targetId="@id/button_south"

motion:clickAction="jumpToStart|transitionToEnd"/>

CustomPixelDimensions

Used when the method takes pixels such as setTextSize(...)

<CustomAttribute

motion:attributeName="textSize"

motion:customPixelDimension="2dp" />

ImageFilterView

New tag overlay - true(default) / false affects crossfade behaviour set to false to crossfade transparent objects.

KeyTrigger collision support

You can fire a KeyTrigger on collision with another view.

<KeyTrigger

motion:motionTarget="@id/button"

motion:motion_triggerOnCollision ="@id/button2"

motion:onPositiveCross="callOnClick"

motion:motion_postLayoutCollision="true"

motion_triggerOnCollision - Id of view to check collision with
motion_postLayoutCollision tested including layout or layout+transform
onPositiveCross Trigger on entering collision state
onNegativeCross Trigger on leaving the collision state
onCross Trigger on entering or leaving the collision state

Rename

To minimize the chance of name clashes with 3p libraries we have renamed attributes that were clashing or had a good chance of clashing.

Old	New
<OnClick app:mode="toggle" app:target="@+id/button" />	<OnClick app:clickAction="toggle" app:targetId="@+id/button" />
<Transition motion:constraintSetStart="@+id/start" motion:constraintSetEnd="@+id/end" motion:nterpolator="easeIn" motion:duration="1000">	<Transition motion:constraintSetStart="@+id/start" motion:constraintSetEnd="@+id/end" motion:motionInterpolator="easeIn" motion:duration="1000">
motion:duration="123"	motion:defaultDuration="123"
motion:interpolator="easeInOut"	motion:motionInterpolator="easeInOut"
motion:progress="0.3"	motion:motionProgress="0.3"
In <OnClick> motion:target="@+id/button"	In <OnClick> motion:targetId="@+id/button"
In <Key* motion:target="0.3"	In <Key* motion:motionTarget="0.3"
motion:elevation="0.3" motion:rotation="0.3" motion:rotationX="0.3" motion:rotationY="0.3" motion:scaleX="0.3" motion:scaleY="0.3" motion:transformPivotX="0.3" motion:transformPivotY="0.3" motion:translationX="0.3" motion:translationY="0.3" motion:translationZ="0.3"	android:elevation="0.3" android:rotation="0.3" android:rotationX="0.3" android:rotationY="0.3" android:scaleX="0.3" android:scaleY="0.3" android:transformPivotX="0.3" android:transformPivotY="0.3" android:translationX="0.3" android:translationY="0.3" android:translationZ="0.3"
motion:transitionPathRotate="0.3"	motion:motionPathRotate="0.3"

Android Studio 3.5 Canary 10 available

Thursday, April 4, 2019

Canary or Dev channelHelp > Check for UpdatesAndroid Studio > Check for Updatesdownload it here Known issues

If you're using Gradle 5.3.0 or later, the patch from 3.5 Canary 9 to 3.5 Canary 10 might fail due to Issue #129240938. If you are using 3.5 Canary 9 and want to upgrade to 3.5 Canary 10, please download the IDE. Alternatively, you can explicitly stop the Gradle Daemon processes by using the command gradle --stop and then retry the update. We apologize for any inconvenience.

Due to a bug in 3.5 Canary 8, no patches are available from that version to any other. If you are using Canary 8 and want to upgrade, please download the IDE. We apologize for any inconvenience.

General fixesData Binding

Issue #129157264: Finding references in XML data binding expressions from Java not working

Issue #128643036: clicking on error does not navigate to file

Issue #120561619: Data binding is breaking code coverage on AS 3.3 RC 1

Issue #129093274: Add kapt lint for new plugin {} syntax

Debugger

Issue #127623509: Android Studio exception when attaching to process for debugging

Deployment

Issue #123461157: Run configuration doesn't remember last played emulator selection with drop down menu

Issue #122956093: Run keystroke (^R) doesn't work if the Navigation Bar is turned off

Gradle

Issue #120429381: Pixelbprobe test fail on Windows.

Kotlin

Issue #129260858: Android Studio 3.5 Canary 8 - Build Failed - Project Sync Failed

Lint

Issue #127955232: Unexpected failure during lint analysis - NullPointerException

Resource Management

Issue #124321895: Android Studio Import Drawable should rename imported drawable as per naming conventions

Testing

Issue #115421146: Wrong classpath order when running JVM tests

Android Studio Preview release notesreporting a bugvote for an existing issue

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Release Updates

Emulator 29.0.1 Canary

ConstraintLayout 2.0.0 alpha 4

Android Studio 3.5 Canary 10 available