如何将activity的函数传给compose

Question

有没有办法将 activity 的带参数的函数传递给 compose 函数？

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MyTheme {
                Main(
                    activityFunWithParam = activityFunWithParam // not work
                )
            }
        }
    }

    fun activityFunWithParam(param: Param) {
        ...
    }
}

@Composable
fun Main(
    activityFunWithPara: (Param) -> Unit
) {
    ...
}

Answer 1

您可以将其作为方法参考传递

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            Main(activityFunWithParam = ::activityFunWithParam)
        }
    }

    fun activityFunWithParam(param: Int) {
        Toast.makeText(this, param.toString(), Toast.LENGTH_SHORT).show()
    }
}

@Composable
fun Main(
        activityFunWithParam: (Int) -> Unit
) {
    activityFunWithParam(5)
    Text(text = "Test")
}

在你的例子中，方法名本身不是一个函数。参见 https://kotlinlang.org/docs/reference/lambdas.html#instantiating-a-function-type

如何将activity的函数传给compose

How to pass activity's function to compose

android

android-jetpack-compose