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Dan Field 835112de79
Use robolectric/AndroidJUnit4 for integration test tests (#144348) 
This allows relanding https://github.com/flutter/engine/pull/51056. The patch introduced a change where a static member is initialized from `View.generateViewId()` instead of conditionally using that API. Without an implementation for that in android.jar, the test will fail. The test in here currently is using a fake implementation that creates errors seen below.

See https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8754827734484522225/+/u/run_plugin_test/stdout#L46564_2 for failure. More detailed failure information is available locally in the `build` folder:

```
Mockito cannot mock this class: class io.flutter.embedding.android.FlutterActivity.

If you're not sure why you're getting this error, please open an issue on GitHub.

Java               : 17
JVM vendor name    : JetBrains s.r.o.
JVM vendor version : 17.0.7+0-17.0.7b1000.6-10550314
JVM name           : OpenJDK 64-Bit Server VM
JVM version        : 17.0.7+0-17.0.7b1000.6-10550314
JVM info           : mixed mode
OS name            : Mac OS X
OS version         : 14.3.1

You are seeing this disclaimer because Mockito is configured to create inlined mocks.
You can learn about inline mocks and their limitations under item #39 of the Mockito class javadoc.

Underlying exception : org.mockito.exceptions.base.MockitoException: Cannot instrument class io.flutter.embedding.android.FlutterActivity because it or one of its supertypes could not be initialized
	at app//dev.flutter.plugins.integration_test.FlutterDeviceScreenshotTest.getFlutterView_returnsFlutterViewForFlutterActivity(FlutterDeviceScreenshotTest.java:32)
	at java.base@17.0.7/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base@17.0.7/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at java.base@17.0.7/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.base@17.0.7/java.lang.reflect.Method.invoke(Unknown Source)
	at app//org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at app//org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at app//org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at app//org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at app//org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at app//org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at app//org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at app//org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at app//org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at app//org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at app//org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at app//org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at app//org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at app//org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at app//org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at app//org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.runTestClass(JUnitTestClassExecutor.java:110)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:58)
	at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecutor.execute(JUnitTestClassExecutor.java:38)
	at org.gradle.api.internal.tasks.testing.junit.AbstractJUnitTestClassProcessor.processTestClass(AbstractJUnitTestClassProcessor.java:62)
	at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
	at java.base@17.0.7/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base@17.0.7/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at java.base@17.0.7/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.base@17.0.7/java.lang.reflect.Method.invoke(Unknown Source)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:36)
	at org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
	at org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:33)
	at org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:94)
	at jdk.proxy1/jdk.proxy1.$Proxy2.processTestClass(Unknown Source)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker$2.run(TestWorker.java:176)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.executeAndMaintainThreadName(TestWorker.java:129)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:100)
	at org.gradle.api.internal.tasks.testing.worker.TestWorker.execute(TestWorker.java:60)
	at org.gradle.process.internal.worker.child.ActionExecutionWorker.execute(ActionExecutionWorker.java:56)
	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:133)
	at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
	at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
	at app//worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)
Caused by: org.mockito.exceptions.base.MockitoException: Cannot instrument class io.flutter.embedding.android.FlutterActivity because it or one of its supertypes could not be initialized
	at app//net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:168)
	at app//net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:399)
	at app//net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:190)
	at app//net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:410)
	... 44 more
Caused by: java.lang.RuntimeException: Method generateViewId in android.view.View not mocked. See http://g.co/androidstudio/not-mocked for details.
	at android.view.View.generateViewId(View.java)
	at io.flutter.embedding.android.FlutterActivity.<clinit>(FlutterActivity.java:218)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Unknown Source)
	at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.assureInitialization(InlineBytecodeGenerator.java:236)
	at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.triggerRetransformation(InlineBytecodeGenerator.java:261)
	at org.mockito.internal.creation.bytebuddy.InlineBytecodeGenerator.mockClass(InlineBytecodeGenerator.java:218)
	at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.lambda$mockClass$0(TypeCachingBytecodeGenerator.java:47)
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:168)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:399)
	at net.bytebuddy.TypeCache.findOrInsert(TypeCache.java:190)
	at net.bytebuddy.TypeCache$WithInlineExpunction.findOrInsert(TypeCache.java:410)
	at org.mockito.internal.creation.bytebuddy.TypeCachingBytecodeGenerator.mockClass(TypeCachingBytecodeGenerator.java:40)
	at org.mockito.internal.creation.bytebuddy.InlineDelegateByteBuddyMockMaker.createMockType(InlineDelegateByteBuddyMockMaker.java:396)
	at org.mockito.internal.creation.bytebuddy.InlineDelegateByteBuddyMockMaker.doCreateMock(InlineDelegateByteBuddyMockMaker.java:355)
	at org.mockito.internal.creation.bytebuddy.InlineDelegateByteBuddyMockMaker.createMock(InlineDelegateByteBuddyMockMaker.java:334)
	at org.mockito.internal.creation.bytebuddy.InlineByteBuddyMockMaker.createMock(InlineByteBuddyMockMaker.java:56)
	at org.mockito.internal.util.MockUtil.createMock(MockUtil.java:99)
	at org.mockito.internal.MockitoCore.mock(MockitoCore.java:88)
	at org.mockito.Mockito.mock(Mockito.java:2087)
	at org.mockito.Mockito.mock(Mockito.java:2002)
	... 44 more
```
2024-02-29 00:57:24 +00:00
.github Bump peter-evans/create-pull-request from 6.0.0 to 6.0.1 (#144344) 2024-02-28 22:01:45 +00:00
.vscode Adjust repo config for VS Code formatting (#122758) 2023-04-14 12:35:42 +02:00
bin Roll Flutter Engine from 455c814fe5de to 10331db8f748 (7 revisions) (#144345) 2024-02-29 00:47:57 +00:00
dev Reland "Reland - Introduce tone-based surfaces and accent color add-ons - Part 2" (#144273) 2024-02-28 13:55:50 -08:00
examples Disable flaky golden file test (#144351) 2024-02-28 18:10:50 -06:00
packages Use robolectric/AndroidJUnit4 for integration test tests (#144348) 2024-02-29 00:57:24 +00:00
.ci.yaml Remove force Xcode debug workflow (#144185) 2024-02-27 18:18:07 +00:00
.gitattributes Add pre-stable support for create on Windows (#51895) 2020-03-23 10:42:26 -07:00
.gitignore add .pub-cache back to .gitignore (#128894) 2023-06-15 19:21:05 +00:00
analysis_options.yaml Allow deprecated members from the Dart SDK and Flutter Engine to roll in (#143347) 2024-02-13 10:41:46 -08:00
AUTHORS Added newline at end of .gitignore files (#141270) 2024-01-12 23:22:11 +00:00
CODE_OF_CONDUCT.md Update list of CoC contacts. (#130630) 2023-07-16 23:39:20 +00:00
CODEOWNERS Reverts "Refactor external_ui → external_textures" (#142173) 2024-01-24 21:41:17 +00:00
CONTRIBUTING.md Add a DevTools section to CONTRIBUTING.md (#137193) 2023-11-13 21:51:07 +00:00
dartdoc_options.yaml Add dartdoc warnings (#138766) 2023-11-21 01:02:00 +00:00
flutter_console.bat License update (#45373) 2019-11-27 15:04:02 -08:00
LICENSE License update (#45373) 2019-11-27 15:04:02 -08:00
PATENT_GRANT Rename patent file (#38686) 2019-08-16 16:54:58 +01:00
README.md Add Flutter CI status to README (#140513) 2024-01-04 18:26:48 +00:00
TESTOWNERS Remove force Xcode debug workflow (#144185) 2024-02-27 18:18:07 +00:00

README.md

Flutter

Flutter CI Status Discord badge Twitter handle codecov CII Best Practices OpenSSF Scorecard SLSA 1

Flutter is Google's SDK for crafting beautiful, fast user experiences for mobile, web, and desktop from a single codebase. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.

Documentation

For announcements about new releases, follow the flutter-announce@googlegroups.com mailing list. Our documentation also tracks breaking changes across releases.

Terms of service

The Flutter tool may occasionally download resources from Google servers. By downloading or using the Flutter SDK, you agree to the Google Terms of Service: https://policies.google.com/terms

For example, when installed from GitHub (as opposed to from a prepackaged archive), the Flutter tool will download the Dart SDK from Google servers immediately when first run, as it is used to execute the flutter tool itself. This will also occur when Flutter is upgraded (e.g. by running the flutter upgrade command).

About Flutter

We think Flutter will help you create beautiful, fast apps, with a productive, extensible and open development model, whether you're targeting iOS or Android, web, Windows, macOS, Linux or embedding it as the UI toolkit for a platform of your choice.

Beautiful user experiences

We want to enable designers to deliver their full creative vision without being forced to water it down due to limitations of the underlying framework. Flutter's layered architecture gives you control over every pixel on the screen and its powerful compositing capabilities let you overlay and animate graphics, video, text, and controls without limitation. Flutter includes a full set of widgets that deliver pixel-perfect experiences whether you're building for iOS (Cupertino) or other platforms (Material), along with support for customizing or creating entirely new visual components.

Reflectly hero image

Fast results

Flutter is fast. It's powered by hardware-accelerated 2D graphics libraries like Skia (that underpins Chrome and Android) and Impeller. We architected Flutter to support glitch-free, jank-free graphics at the native speed of your device.

Flutter code is powered by the world-class Dart platform, which enables compilation to 32-bit and 64-bit ARM machine code for iOS and Android, JavaScript and WebAssembly for the web, as well as Intel x64 and ARM for desktop devices.

Dart diagram

Productive development

Flutter offers stateful hot reload, allowing you to make changes to your code and see the results instantly without restarting your app or losing its state.

Hot reload animation

Extensible and open model

Flutter works with any development tool (or none at all), and also includes editor plug-ins for both Visual Studio Code and IntelliJ / Android Studio. Flutter provides tens of thousands of packages to speed your development, regardless of your target platform. And accessing other native code is easy, with support for both FFI (on Android, on iOS, on macOS, and on Windows) as well as platform-specific APIs.

Flutter is a fully open-source project, and we welcome contributions. Information on how to get started can be found in our contributor guide.