Kotlin Compose 隐式传参 CompositionLocalProvider

代码

package com.anguomob.jecpack.activity.compose.composition.local

import androidx.compose.foundation.layout.Column
import androidx.compose.material.ContentAlpha
import androidx.compose.material.LocalContentAlpha
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.ui.platform.LocalContext

@Composable
fun CompositionSample2() {
    MaterialTheme() {
        Column() {
            Text(text = "sadjkllllasdkljaskljdasjkldaskjldajlk")
            CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.medium) {
                Text(text = "sadjkllllasdkljaskljdasjkldaskjldajlk")
                Text(text = "sadjkllllasdkljaskljdasjkldaskjldajlk")
                CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.disabled) {
                    DescendantExample()
                }
            }
            CompositionLocalProvider(LocalContentAlpha provides ContentAlpha.disabled) {
                DescendantExample()
            }
        }
    }
}

@Composable
fun DescendantExample() {
    Text(text = "sadjkllllasdkljaskljdasjkldaskjldajlk")
}

样式

 

这个场景你很常用的有获取上下文

@Composable
fun FruitText(fruitSize: Int) {
    val res = LocalContext.current.resources
    val fruitText = res.getQuantityString(R.plurals.fruit_title, fruitSize)
    Text(text = "${fruitSize} ${fruitText}")
}

LocalContext.current