start(){
    loadA(){
        loadB(){
            loadC()
        }
    }
}

val decorView = this.window.decorView
ViewStubTaskManager.instance(decorView)
            .addTask(ViewStubTaskContent(decorView))
            .addTask(ViewStubTaskTitle(decorView))
            .addTask(ViewStubTaskBottom(decorView))
            .start()

class ViewStubTaskManager private constructor(val decorView: View) : Runnable {
    private var iViewStubTask: IViewStubTask? = null
    companion object {
        const val TAG = "ViewStubTaskManager"
        @JvmStatic
        fun instance(decorView: View): ViewStubTaskManager {
            return ViewStubTaskManager(decorView)
        }
    }
    private val queue: MutableList<ViewStubTask> = CopyOnWriteArrayList()
    private val list: MutableList<ViewStubTask> = CopyOnWriteArrayList()
    fun setCallBack(iViewStubTask: IViewStubTask?): ViewStubTaskManager {
        this.iViewStubTask = iViewStubTask
        return this
    }
    fun addTask(viewStubTasks: List<ViewStubTask>): ViewStubTaskManager {
        queue.addAll(viewStubTasks)
        list.addAll(viewStubTasks)
        return this
    }
    fun addTask(viewStubTask: ViewStubTask): ViewStubTaskManager {
        queue.add(viewStubTask)
        list.add(viewStubTask)
        return this
    }
    fun start() {
        if (isEmpty()) {
            return
        }
        iViewStubTask?.beforeTaskExecute()
        // 指定 decorView 绘制下一帧的时候会回调里面的 runnable
        ViewCompat.postOnAnimation(decorView, this)
    }
    fun stop() {
        queue.clear()
        list.clear()
        decorView.removeCallbacks(null)
    }
    private fun isEmpty() = queue.isEmpty() || queue.size == 0
    override fun run() {
        if (!isEmpty()) {
            // 当队列不为空的时候，先加载当前 viewStubTask
            val viewStubTask = queue.removeAt(0)
            viewStubTask.inflate()
            iViewStubTask?.onTaskExecute(viewStubTask)
            // 加载完成之后，再 postOnAnimation 加载下一个
            ViewCompat.postOnAnimation(decorView, this)
        } else {
            iViewStubTask?.afterTaskExecute()
        }
    }
    fun notifyOnDetach() {
        list.forEach {
            it.onDetach()
        }
        list.clear()
    }
    fun notifyOnDataReady() {
        list.forEach {
            it.onDataReady()
        }
    }
}
interface IViewStubTask {
    fun beforeTaskExecute()
    fun onTaskExecute(viewStubTask: ViewStubTask)
    fun afterTaskExecute()
}

@UiThread
fun asyncInflate(
        context: Context,
        vararg items: AsyncInflateItem?
    ) {
        items.forEach { item ->
            if (item == null || item.layoutResId == 0 || mInflateMap.containsKey(item.inflateKey) || item.isCancelled() || item.isInflating()) {
                return
            }
            mInflateMap[item.inflateKey] = item
            onAsyncInflateReady(item)
            inflateWithThreadPool(context, item)
        }
    }

/**
     * 用来获得异步inflate出来的view
     *
     * @param context
     * @param layoutResId 需要拿的layoutId
     * @param parent      container
     * @param inflateKey  每一个View会对应一个inflateKey，因为可能许多地方用的同一个 layout，但是需要inflate多个，用InflateKey进行区分
     * @param inflater    外部传进来的inflater，外面如果有inflater，传进来，用来进行可能的SyncInflate，
     * @return 最后inflate出来的view
     */
    @UiThread
    fun getInflatedView(
        context: Context?,
        layoutResId: Int,
        parent: ViewGroup?,
        inflateKey: String?,
        inflater: LayoutInflater
    ): View {
        if (!TextUtils.isEmpty(inflateKey) && mInflateMap.containsKey(inflateKey)) {
            val item = mInflateMap[inflateKey]
            val latch = mInflateLatchMap[inflateKey]
            if (item != null) {
                val resultView = item.inflatedView
                if (resultView != null) {
                    //拿到了view直接返回
                    removeInflateKey(item)
                    replaceContextForView(resultView, context)
                    Log.i(TAG, "getInflatedView from cache: inflateKey is $inflateKey")
                    return resultView
                }
                if (item.isInflating() && latch != null) {
                    //没拿到view，但是在inflate中，等待返回
                    try {
                        latch.await()
                    } catch (e: InterruptedException) {
                        Log.e(TAG, e.message, e)
                    }
                    removeInflateKey(item)
                    if (resultView != null) {
                        Log.i(TAG, "getInflatedView from OtherThread: inflateKey is $inflateKey")
                        replaceContextForView(resultView, context)
                        return resultView
                    }
                }
                //如果还没开始inflate，则设置为false，UI线程进行inflate
                item.setCancelled(true)
            }
        }
        Log.i(TAG, "getInflatedView from UI: inflateKey is $inflateKey")
        //拿异步inflate的View失败，UI线程inflate
        return inflater.inflate(layoutResId, parent, false)
    }

object AsyncUtils {
    fun asyncInflate(context: Context) {
        val asyncInflateItem =
            AsyncInflateItem(
                LAUNCH_FRAGMENT_MAIN,
                R.layout.fragment_asny,
                null,
                null
            )
        AsyncInflateManager.instance.asyncInflate(context, asyncInflateItem)
    }
    fun isHomeFragmentOpen() =
        getSP("async_config").getBoolean("home_fragment_switch", true)
}

override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val startTime = System.currentTimeMillis()
        val homeFragmentOpen = AsyncUtils.isHomeFragmentOpen()
        val inflatedView: View
        inflatedView = AsyncInflateManager.instance.getInflatedView(
            context,
            R.layout.fragment_asny,
            container,
            LAUNCH_FRAGMENT_MAIN,
            inflater
        )
        Log.i(
            TAG,
            "onCreateView: homeFragmentOpen is $homeFragmentOpen, timeInstance is ${System.currentTimeMillis() - startTime}, ${inflatedView.context}"
        )
        return inflatedView
//        return inflater.inflate(R.layout.fragment_asny, container, false)
    }