在Android中改变碎片时，如何加速

Question

为什么不对我有帮助？

在我的应用程序中，我使用 BottomNavBar 和 NavigationGraph 用于显示一些fragments！
在我的fragments中，我有很多视图(fragment布局具有 1069行 XML代码(，当从BottomNavBar中选择此fragment时，第二次向我显示了fragment。
换句话说，请向我展示此 fragment 带有延迟！

片段代码：

class HomeDashboardFragment : Fragment(), HomeDashboardContracts.View {
    @NonNull
    private var pageTitle: TextView? = null
    @NonNull
    private var menuIcon: TextView? = null
    private lateinit var token: String
    private lateinit var presenter: HomeDashboardPresenterImpl
    private var giftExpireSplit: List<String> = emptyList()
    private var giftExpireDate: List<String> = emptyList()
    private var timeUtils: TimeUtils? = null
    @NonNull
    private var disposable: Disposable? = null
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_home_dashboard, container, false)
    }
    @SuppressLint("WrongConstant")
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        //Initialize
        presenter = HomeDashboardPresenterImpl(requireContext(), this)
        //Initialize views from activity
        activity?.let { itActivity ->
            pageTitle = itActivity.findViewById(R.id.toolbarMain_title)
            menuIcon = itActivity.findViewById(R.id.toolbarMain_menuIcon)
            //Set title
            pageTitle?.let { itTitle ->
                itTitle.text = getString(R.string.menuHomeDashboard)
            }
            //Open menu
            menuIcon?.let { itMenu ->
                itMenu.setOnClickListener {
                    itActivity.findViewById<AwesomeDrawerLayout>(R.id.homePage_drawerLayout).openDrawer(Gravity.END)
                }
            }
            //Get token
            token = GoodPrefs.getInstance().getString(PrefsKey.USER_JWT_TOKEN.name, "")
            //User registered
            if (GoodPrefs.getInstance().isKeyExists(PrefsKey.USER_JWT_TOKEN.name)) {
                menuIcon?.visibility = View.VISIBLE
            }
            //Set layout
            presenter.checkRegisterUser(token)
            //Load profile data
            if (!isEmptyString(token)) {
                presenter.getProfile(token, USER_NOTIF_ID)
            }
        }
    }

MainActivity将fragments的代码与NavigationGraph设置为BottomNavBar：

private fun setupNavigation() {
    val navController = Navigation.findNavController(this, R.id.homePage_fragmentNavHost)
    NavigationUI.setupWithNavController(homePage_bottomNavBar, navController)
}
override fun onSupportNavigateUp() = Navigation.findNavController(this, R.id.homePage_fragmentNavHost).navigateUp()

如何解决此问题？

Answer 1

您可以添加由单个ViewGroup组成的布局虚拟。然后，在OnViewCreated方法中夸大了真实的布局。例如：

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?) =
       inflater.inflate(R.layout.layout_dummy, container, false);
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        Handler().post {
            val layout = flContainer
            val child = layoutInflater.inflate(R.layout.fragment_real, null)
            layout.removeAllViews()
            layout.addView(child)
            setupToolbar()
            setupWebView()
        }
    }

layout_dummy.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
        android:id="@+id/flContainer"
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
</FrameLayout>

Answer 2

您发行的问题几乎是由大量XML文件引起的。加载所有这些视图需要时间。您有很多嵌套会使事情变慢。

您必须优化布局。删除您不需要的东西。用约束lay替换尽可能多的嵌套线安装。如果要成为一个长的，滚动的视图，也可以使用回收即可。

希望会有所帮助。