小编ko2*_*2ic的帖子

This application counts up A when C is pressed. Since A is the only one that has changed, I expected the recomposition to be just that. But C is also recomposition.

Here is the code.

ViewModel exposes StateFlow.

class MainViewModel : ViewModel() {
  private val _count: MutableStateFlow<Int> = MutableStateFlow(0)
  val count: StateFlow<Int> = _count.asStateFlow()
  fun increaseCount() {
    _count.value++
  }
}

CCompose calls increaseCount().

@Composable
fun CountUpScreen(
  modifier: Modifier = Modifier,
  viewModel: MainViewModel = viewModel(),
) {
  val count: Int …

“ kotlin-allopen”插件有效，但“ kotlin-noarg”插件无效。我能怎么做？

下面是代码。

build.gradle

buildscript {
    ext.kotlin_version = '1.1.3-2'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0-beta2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlin_version"
        classpath "org.jetbrains.kotlin:kotlin-noarg:$kotlin_version"
        classpath "io.realm:realm-gradle-plugin:3.5.0"
    }
}
apply plugin: "kotlin-allopen"
apply plugin: "kotlin-noarg"

allOpen {
    annotation("sample.AllOpen")
}
noArg {
    annotation("sample.NoArg")
    invokeInitializers = true
}

app / build.gradle

apply plugin: 'realm-android'

NoArg.kt

@Target(AnnotationTarget.CLASS)
@Retention(AnnotationRetention.SOURCE)
annotation class NoArg

MyApplication.kt

class MyApplication : Application() {
    override fun onCreate() {
        super.onCreate()
        Realm.init(this)
    }
}

AndroidManifest.xml

<application
    android:name=".MyApplication"

SampleEntity.kt

@NoArg
@AllOpen
@RealmClass
data …