Known issues with Android Studio and Android Gradle Plugin

This page tracks known issues with Android Studio 3.5 and Android Gradle plugin 3.5.0. If you experience an issue not already included here, please report a bug.

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Known Issues with Android Studio

This section describes known issues that exist in the latest stable version of Android Studio.

Code editing

This section describes known issues related to the code editor.

Frozen keyboard input - "iBus" problems on Linux

There are some known interactions between the iBus daemon on Linux and Android Studio. In some scenarios, the IDE stops responding to keyboard input or starts inputting random characters. This bug is triggered by some missing synchronization between iBus and XLib + AWT, and has already been reported upstream to JetBrains and iBus. There are three current workarounds for this issue:

Workaround 1: Force iBus into synchronous mode. Before starting Android Studio, run the following on the command line:
```
$ IBUS_ENABLE_SYNC_MODE=1 ibus-daemon -xrd
```
Workaround 2: Disable iBus input in Android Studio. To disable iBus input for Android Studio only, run the following on the command line:
```
$ XMODIFIERS= ./bin/studio.sh
```
This workaround only disables input methods for Android Studio, not any other applications you may be running. Note that if you restart the daemon while Android Studio is running (for example, by running ibus-daemon -rd), you effectively disable the input methods for all other applications and may also crash Android Studio's JVM with a segmentation fault.
Workaround 3: Double-check the shortcut bindings to make sure that the Next input shortcut is not set to Control+Space, since this is also the code completion shortcut in Android Studio. Ubuntu 14.04 (Trusty) makes Super+Space the default shortcut, but settings from previous versions may still be around. To check your shortcut bindings, run ibus-setup on the command line to open the IBus Preferences window. Under Keyboard Shortcuts, check the Next input method. If it is set to Control+Space, change it to Super+Space, or another shortcut of your choice.

Project configuration

This section describes known issues related to project configuration and Gradle sync.

Gradle Sync Failed: Broken Pipe

The issue is that the Gradle daemon is trying to use IPv4 instead of IPv6.

Workaround 1: On Linux, put the following in your ~/.profile or ~/.bash_profile:
```
export _JAVA_OPTIONS="-Djava.net.preferIPv6Addresses=true"
```
Workaround 2: in Android Studio's vmoptions file, change the line -Djava.net.preferIPv6Addresses=true to -Djava.net.preferIPv6Addresses=true For more information, see the Networking IPv6 User Guide.

"peer not authenticated" errors from Gradle sync or SDK Manager

The root cause of these errors is a missing certificate in $JAVA_HOME/jre/lib/certificates/cacerts. To resolve these errors, proceed as follows:

If you're behind a proxy, try to connect directly. If the direct connection works, then in order to connect via the proxy you may need to use keytool to add the proxy server's certificate to the cacerts file.
Re-install a supported, unmodified JDK. There's a known issue affecting Ubuntu users, which results in an empty /etc/ssl/certs/java/cacerts. To work around this issue, execute the following on the command line:
```
sudo /var/lib/dpkg/info/ca-certificates-java.postinst configure
```

Deploying

This section describes known issues related to deploying your app to a connected device.

Android Emulator HAXM on macOS High Sierra

The Android Emulator on macOS High Sierra (10.13) requires HAXM 6.2.1+ for best compatibility and stability with macOS. However, macOS 10.13 has a more involved process to install kernel extensions such as HAXM. You need to manually allow the kernel extension itself to be installed as follows:

First, attempt to install the latest version of HAXM from the SDK Manager.
In MacOS, go to System Preferences > Security and Privacy.
If you see an alert that System software from developer "Intel Corporation Apps" was blocked from loading, click Allow:

For more information and workarounds, see this Apple webpage and issue 62395878.

Apply Changes

This section describes known issues that are related to Apply Changes.

Issue in Android Runtime throws error

If you're using a device that runs Android 8.0 or 8.1, you might encounter "VERIFICATION_ERROR" messages when trying to apply certain types of changes (especially if you're using Kotlin). This message is caused by an issue with the Android Runtime that is fixed in Android 9.0 and higher. Although the issue causes Apply Changes to fail, you can still Run your app again to see your changes. However, we recommend that you upgrade the device to Android 9.0 or greater.

Cannot apply changes when using android:sharedUserId

If you try to make changes to a class that hasn't yet been deployed to your running app, Apply Changes will fail if your app is configured in either of the following ways:

Your app shares data with another app using a shared android:sharedUserId.
Your app runs in the same process as another app using a shared android:sharedUserId and android:process.

When Apply Changes fails due to this issue, Android Studio displays the following message:

Changes were not applied. JVMTI error: UNKNOWN_JVMTI_ERROR

To work around this issue in Android Studio 3.5, click Run to re-deploy your app and see your changes.

Debugging and testing

This section describes known issues related to debugging and testing your app.

JUnit tests missing resources in classpath when run from Android Studio

If you have specific resource folders in your Java modules, then those resources won't be found when running tests from the IDE. Running tests using Gradle from the command line will work. Executing the Gradle check task from the IDE will also work. See issue 64887 for more details.

This issue occurs because as of IntelliJ 13, which requires that you only have a single folder as the classpath. IntelliJ's builder copies all resources into that build folder, but Gradle doesn't copy over the resources.

Workaround 1: Run the Gradle check task from the IDE rather than running a unit test.
Workaround 2: Update your build script to manually copy resources into the build folder. See comment #13 for more information.

Running JUnit tests may compile the code twice

When creating a new project, the template JUnit configuration might be created with two "Before launch" steps: Make and Gradle-aware Make. This configuration is then propagated to all created JUnit run configurations.

To fix the issue for the current project, click Run > Edit Configurations and change the default JUnit configuration to only include the Gradle-aware Make step.
To fix the issue for all future projects, click File > Close Project. You should see the welcome screen. Then click Configure > Project Defaults > Run Configurations and change the JUnit configuration to only include the Gradle-aware Make step.

Some test run configurations don't work

Not all run configurations that are available when right-clicking a test method are valid. Specifically, the following configurations are not valid:

Gradle run configurations (which have a Gradle logo as the icon) don't work.
JUnit run configurations (which have an icon without the green Android) don't apply to instrumentation tests, which cannot be run on the local JVM.

Android Studio also remembers the run configuration created in a given context (for example, right-clicking a specific class or method), and will not offer to run in a different configuration in the future. To fix this, click Run > Edit Configurations and remove the incorrectly-created configurations.

Adding Java breakpoints while debugging native code

While your app is paused at a breakpoint in your native code, the Auto and Dual debuggers may not immediately recognize new Java breakpoints that you set. To avoid this issue, add Java breakpoints either before starting a debug session or while the app is paused on a Java breakpoint. For more information, see issue 229949.

Stepping out of the native debugger

While using the Auto or Dual debugger to debug Java and native code, if you step into a native function from your Java code (for example, the debugger pauses execution at a line in your Java code that calls a native function and you click Step Into ) and you want to return to your Java code, click Resume Program (instead of Step Out or Step Over ). Your app process will still be paused, so click Resume Program in the your-module-java tab to resume it. For more information, see issue 224385.

Profilers

This section describes known issues with the Profilers.

ADB exception when debugging or profiling

When using Platform Tools 29.0.3, native debugging and the Android Studio Profilers might not work properly, and you might see either "AdbCommandRejectedException" or "Failed to connect port" in the idea.log file when you select Help > Show Log. Upgrading the Platform Tools to 29.0.4 or higher fixes both issues.

To upgrade the Platform Tools, do the following:

Open the SDK Manager from Android Studio by clicking Tools > SDK Manager or click SDK Manager in the toolbar.

Click the checkbox next to Android SDK Platform-Tools so it shows a checkmark. A download icon should appear in the left column.

Click Apply or OK.

Known issues with the Android Gradle Plugin

This section describes known issues that exist in the latest stable version of the Android Gradle plugin.

Signing file named with Carriage Return (CR) characters

JAR signing (v1 scheme) does not support file names containing Carriage Return (CR) characters. (See issue #63885809).

API changes

Android Gradle Plugin 3.0.0 and higher introduce API changes that remove certain functionalities and may break your existing builds. Later versions of the plugin may introduce new public APIs that replace broken functionalities.

Modifying variant outputs at build time may not work

Using the Variant API to manipulate variant outputs is broken with the new plugin. It still works for simple tasks, such as changing the APK name during build time, as shown below:

// If you use each() to iterate through the variant objects,
// you need to start using all(). That's because each() iterates
// through only the objects that already exist during configuration time—
// but those object don't exist at configuration time with the new model.
// However, all() adapts to the new model by picking up object as they are
// added during execution.
android.applicationVariants.all { variant ->
    variant.outputs.all {
        outputFileName = "${variant.name}-${variant.versionName}.apk"
    }
}

However, more complicated tasks that involve accessing outputFile objects no longer work. That's because variant-specific tasks are no longer created during the configuration stage. This results in the plugin not knowing all of its outputs up front, but it also means faster configuration times.

manifestOutputFile is no longer available

The processManifest.manifestOutputFile() method is no longer available, and you get the following error when you call it:

A problem occurred configuring project ':myapp'.
   Could not get unknown property 'manifestOutputFile' for task ':myapp:processDebugManifest'
   of type com.android.build.gradle.tasks.ProcessManifest.

Instead of calling manifestOutputFile() to get the manifest file for each variant, you can call processManifest.manifestOutputDirectory() to return the path of the directory that contains all generated manifests. You can then locate a manifest and apply your logic to it. The sample below dynamically changes the version code in the manifest:

android.applicationVariants.all { variant ->
    variant.outputs.all { output ->
        output.processManifest.doLast {
            // Stores the path to the maifest.
            String manifestPath = "$manifestOutputDirectory/AndroidManifest.xml"
            // Stores the contents of the manifest.
            def manifestContent = file(manifestPath).getText()
            // Changes the version code in the stored text.
            manifestContent = manifestContent.replace('android:versionCode="1"',
                    String.format('android:versionCode="%s"', generatedCode))
            // Overwrites the manifest with the new text.
            file(manifestPath).write(manifestContent)
        }
    }
}

Fixed known issues

This section describes known issues that have been fixed in a recent release. If you are experiencing any of these issues, you should update Android Studio to the latest stable or preview version.

Fixed in Android Studio 3.6 Beta 1

APK installation error on LineageOS: Deploying your app to devices running certain versions of LineageOS or CyanogenMod might fail and throw an INSTALL_PARSE_FAILED_NOT_APK exception.

On Android Studio 3.6 Beta 1 and higher, the IDE handles this exception by performing a full app install when you deploy your app to LineageOS or CyanogenMod devices, which might result in longer deploy times.

Fixed in Android Studio 3.5.2

Broken XML code style: When editing XML code, the IDE applied an incorrect code style when you selected Code > Reformat Code from the menu bar.

Fixed in Android Studio 3.3.1

Out of memory errors when scanning C++-based projects: When Gradle scans a project that has C++ code in more than one location on the same drive, the scan includes all directories below the first common directory. Scanning a large number of directories and files may lead to out of memory errors.

For more information on this issue, read the bug associated with the issue.