This is a companion discussion topic for the original entry at https://www.raywenderlich.com/9147615-kotlin-flow-getting-started/lessons/12
This is a companion discussion topic for the original entry at https://www.raywenderlich.com/9147615-kotlin-flow-getting-started/lessons/12
Great course so far Joe.
I used lifecycleScope.launch {} instead of making the Fragment a CoroutineScope. I’m guessing this does the same thing under the hood but we don’t have to handle the cancelling of the flow ourselves in this case? Do you think this is okay to do or would you suggest implementing CoroutineScope for UI Controllers (activity/fragment) when using flows?
Hi @thequinneffect, thank you and thanks for the question!
I think using lifecycleScope.launch {} is a great alternative. All the things being added in KTX are really helping to reduce boilerplate. Thanks again!
Sorry but it’s better to use flow inside VM and populate it as live data with flow.toLivedata extension.
And also better to have coroutine context inside VM not in the Fragment.
Two points:
The final and starter code are the same for this lecture
In the starter project video, the code on the repo is failing to execute:
java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException at java.base/java.lang.Class.getDeclaredConstructors0(Native Method) at java.base/java.lang.Class.privateGetDeclaredConstructors(Class.java:3137) at java.base/java.lang.Class.getConstructor0(Class.java:3342) at java.base/java.lang.Class.newInstance(Class.java:556) at org.jetbrains.kotlin.cli.jvm.plugins.ServiceLoaderLite.loadImplementations(ServiceLoaderLite.kt:51) at org.jetbrains.kotlin.cli.jvm.plugins.ServiceLoaderLite.loadImplementations(ServiceLoaderLite.kt:44) at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension$loadProcessors$efficientProcessorLoader$1.doLoadProcessors(Kapt3Extension.kt:83) at org.jetbrains.kotlin.kapt3.base.ProcessorLoader.loadProcessors(ProcessorLoader.kt:45) at org.jetbrains.kotlin.kapt3.base.ProcessorLoader.loadProcessors$default(ProcessorLoader.kt:28) at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.loadProcessors(Kapt3Extension.kt:88) at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.analysisCompleted(Kapt3Extension.kt:171) at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.analysisCompleted(Kapt3Extension.kt:98) at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM$analyzeFilesWithJavaIntegration$2.invoke(TopDownAnalyzerFacadeForJVM.kt:97) at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:107) at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:82) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:557) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:82) at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:107) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:548) at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:177) at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:165) at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:55) at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:84) at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:42) at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:104) at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1558) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:359) at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200) at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196) at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562) at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796) at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:829) Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) … 43 more
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