如何从 Kotlin 协程返回值

Posted 2023-01-02 安果移不动

package com.example.test_compose.ui

import android.util.Log
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.ExperimentalCoroutinesApi
import kotlinx.coroutines.async
import kotlinx.coroutines.delay

@OptIn(ExperimentalCoroutinesApi::class)
class MainViewModel : ViewModel() 
    private val TAG = "MainViewModel"

    init 
        val result = viewModelScope.async 
            delay(3000)
            true
        
        result.invokeOnCompletion 
            if (it == null) 
                Log.e(TAG, "init:$result.getCompleted() ")
            
        
    

过3s 会返回true