kotlin 测试协程嵌套

测试下协程嵌套：

private fun test1() { // 测试协程的嵌套
        lifecycleScope.launch {
            Log.d("zxzx", "启动parent协程，线程：${Thread.currentThread().name}")
            val parent = lifecycleScope.launch {
                Log.d("zxzx", "parent协程开始执行，线程：${Thread.currentThread().name}")
                launch {
                    Log.d("zxzx", "子协程1开始, 线程：${Thread.currentThread().name}")
                    delay(1000)
                    Log.d("zxzx", "子协程1完成, 线程：${Thread.currentThread().name}")
                }
                launch {
                    Log.d("zxzx", "子协程2开始, 线程：${Thread.currentThread().name}")
                    delay(2000)
                    Log.d("zxzx", "子协程2完成, 线程：${Thread.currentThread().name}")
                }
            }
            parent.join()
            Log.d("zxzx", "parent协程完成。")
            Log.d("zxzx", "你以为湾仔你最大？我乌鸦偏偏不把你放在眼里。")
        }
    }

运行，打印：

ok. join函数能让父协程等待子协程完成。