Question

使用kotlin的代码，首先，这是我的错误代码。

这是我使用的扩展BaseFragment

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val cacheView = mView == null
        if (cacheView) {
            mView = inflater.inflate(getFragLayoutResID(), container, false)
            initView(mView!!)
        }
        return mView
    }

    //When used in an activity
    fun addFragment(context: FragmentActivity, fragmentContainer: Int) {
        val fragmentManager = context.supportFragmentManager
        val ft = fragmentManager.beginTransaction()
        ft.replace(fragmentContainer, this, javaClass.simpleName).addToBackStack(javaClass.simpleName)
            .commitAllowingStateLoss()
        ft.setMaxLifecycle(this, Lifecycle.State.RESUMED)
    }

这是我的HomeActivity

homeVideoFragment.addFragment(mContext as FragmentActivity, mainFrameLayout.id)

这是我的HomeFragment

    //HomeFragment
    override fun initView(view: View) {//this is my homeFragment
        initAdapter()
        //init()
    }

    private var homeVideoAdapter: HomeVideoAdapter? = null
    private fun initAdapter() {//this is my init adapter
        val homeVideoManager = LinearLayoutManager(mContext, RecyclerView.VERTICAL, false)
        homeVideoAdapter = HomeVideoAdapter(mContext!!)
        home_video_rv.layoutManager = homeVideoManager
        home_video_rv.adapter = homeVideoAdapter
    }

    private fun init() = runBlocking {
        GlobalScope.launch(Dispatchers.Main) {
            initAdapter()
            //GlobalScope.async(Dispatchers.IO) {
            //presenter!!.getVideoClassPost(AllPort.POST_GET_VIDEO_HOME)//network requests
            //}.await()
        }
    }

这样运行代码时，将报告错误：home_video_rv不能为空。

但是当我使用init（）时，它工作正常。

虽然成功，但无法发出网络请求。

为什么会出现此问题？

Answer 1

使用onViewCreated方法

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
            val cacheView = mView == null
            if (cacheView) {
                mView = inflater.inflate(getFragLayoutResID(), container, false)
            }
            return mView
        }

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        initView(view)
    }

使用androidx.fragment.app.Fragment，我发现无法在initView（）中初始化initAdapter（），为什么？

1 个答案: