IssueTracker

Trying to reproduce this on my 4.2.2 (v17) Nexus 4. Added this drawable:

<transition xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:drawable="@drawable/test_drawable_blue"/>
    <item android:drawable="@drawable/test_drawable_green"/>
</transition>

where blue/green drawables look like this:

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <size
        android:width="@dimen/drawable_large_size"
        android:height="@dimen/drawable_small_size" />
    <solid
        android:color="@color/test_blue" />
</shape>

Then added this test:

    @Test
    public void testMutateTransitionDrawable() {
        Drawable drawable = ResourcesCompat.getDrawable(mResources,
                R.drawable.test_transition_drawable, null);
        assertTrue(drawable instanceof TransitionDrawable);

        Drawable mutated = drawable.mutate();
        assertTrue(drawable instanceof TransitionDrawable);
        assertTrue(mutated instanceof TransitionDrawable);
    }

It passes on the device. Going to also try on other earlier devices a bit later in the day once they are charged.

Also not reproducible on Galaxy Nexus running 4.0.1 (v14), 4.0.4 (v15) and 4.2.2 (v17)

https://android-review.googlesource.com/c/platform/frameworks/support/+/960032 with the test. Closing as not reproducible. If this is still happening for you, we'd need to see either a test (same as in this CL) or a small, standalone sample project that reproduces this issue on v17 (or other) devices.

Project: platform/prebuilts/androidx/external
Branch: androidx-master-dev

commit 4899d733d629672ccf72ec2cdb41dbf26a3697a6
Author: Winson <chiuwinson@google.com>
Date:   Mon Sep 28 11:35:42 2020

    Add dexmaker-mockito-inline
   
    Used for mocking final classes when there is no available alternative
    to test platform APIs.
   
    Bug: 159831205
   
    Change-Id: Ib52e3f3c5dee75b059cc32e9924ce312f88881a2

A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/LICENSE
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0-sources.jar
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0-sources.jar.md5
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0-sources.jar.sha1
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0.aar
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0.aar.md5
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0.aar.sha1
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0.pom
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0.pom.md5
A       com/linkedin/dexmaker/dexmaker-mockito-inline/2.25.0/dexmaker-mockito-inline-2.25.0.pom.sha1
M       com/linkedin/dexmaker/dexmaker/2.25.0/LICENSE
M       org/mockito/mockito-core/2.25.0/LICENSE

https://android-review.googlesource.com/1441255

Project: platform/frameworks/support
Branch: androidx-master-dev

commit b309cdeb976c33a91306dbc6ff7851398b4f71c6
Author: Winson <chiuwinson@google.com>
Date:   Wed Sep 23 10:52:42 2020

    Add PackageInfoCompat signature verification APIs
   
    Create methods for retrieving the Signature[] for a package on device,
    as well as verifying that a package has a set of certificates.
   
    Checking by app UID is not supported. Callers must use package name.
    This is done to ensure the system doesn't arbitrarily choose a package
    to check against.
   
    A matchExact parameter is provided to address compatibility for
    un-patched devices that are affected by the certificate reference fake
    ID vulnerability. For such devices, all certificates of the package
    being checked must be verified.
   
    Bug: 159831205
   
    Test: androidx.core.content.pm.PackageInfoCompatSignaturesTest
    Test: androidx.core.content.pm.PackageInfoCompatTest
   
    Relnote: "Added PackageInfoCompat#getSignatures for retrieving the
        certificate array for a package"
    Relnote: "Added PackageInfoCompat#hasSignatures for verifying package
        ceritificates"
   
    Change-Id: I8e9a3ece2d45416abbcbaaa0cf2a0485180997d3

M       buildSrc/src/main/kotlin/androidx/build/dependencies/Dependencies.kt
M       core/core/api/current.txt
M       core/core/api/public_plus_experimental_current.txt
M       core/core/api/restricted_current.txt
M       core/core/build.gradle
A       core/core/src/androidTest/java/androidx/core/content/pm/PackageInfoCompatHasSignaturesTest.kt
M       core/core/src/androidTest/java/androidx/core/content/pm/PackageInfoCompatTest.java
A       core/core/src/androidTest/java/androidx/core/util/mockito/CustomMockMaker.kt
A       core/core/src/androidTest/java/androidx/core/util/mockito/CustomStackTraceCleaner.kt
A       core/core/src/androidTest/resources/mockito-extensions/org.mockito.plugins.MockMaker
A       core/core/src/androidTest/resources/mockito-extensions/org.mockito.plugins.StackTraceCleaner
M       core/core/src/main/java/androidx/core/content/pm/PackageInfoCompat.java
M       settings.gradle
A       testutils/testutils-mockito/build.gradle
A       testutils/testutils-mockito/src/main/AndroidManifest.xml
A       testutils/testutils-mockito/src/main/java/androidx/testutils/mockito/MockitoUtils.kt

https://android-review.googlesource.com/1439137