Android BottomNavigationView在滚动时隐藏，但在片段更改时不显示

我有一个BottomNavigationView，当视图滚动到底部时隐藏，当视图滚动到顶部时返回

当底部导航视图被隐藏且我更改时，我的问题是 我无法在中显示BottomNavigationView的片段 任何帮助都是可观的

下面是我的仪表盘活动代码。kt

---

更新至最新的支持库版本28.0.0-alpha1，只需向BottomNavigationView添加一个属性

<BottomNavigationView
 ....
 ....
 app:layout_behavior="@string/hide_bottom_view_on_scroll_behavior"/>

---

注意：-请参见此处

您的活动代码在哪里？@PratikButani问题中添加的活动代码可能会有帮助：@PratikButani很抱歉，这对我来说不是预期的结果。我希望在片段更改时，我的底部导航视图可见性可见，因为当前正在发生的情况是，当片段滚动时BottomNavigationView正在隐藏，当我以编程方式更改片段时，BottomNavigationView不会显示在任何地方，我希望您能正确回答我的问题。行为部分已经存在，问题是如何在片段更改时自动显示我的底部导航视图他已经在使用：

app:layout_behavior=“@string/hide_bottom_view_on_scroll_behavior”

检查XMLbottomNavigation.setBehaviorTranslationEnabled（false）；bottomNavigation.setTranslucentNavigationEnabled（false）；使用这个，我在我的代码中使用永久隐藏

    class DashboardActivity : BaseActivity(), EditProfileFragment.RefreshView, AddPatientFragment.NavigateView {

    override fun navigateView() {
        toDashboard()
    }

    override fun refreshView() {

        val f: Fragment? = supportFragmentManager.findFragmentById(R.id.frame_container)
        if (f != null && f is ProfileFragment) {
            f.refreshView()
            supportActionBar?.title = PROFILE

        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dashboard)

        initializeToolBar()

        navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener)

        toDashboard()
    }

    /**
     * Initialization of ToolBar
     */
    private fun initializeToolBar() {

        val toolbar: Toolbar = findViewById(R.id.toolbar)
        setSupportActionBar(toolbar)

        if (supportActionBar != null) {
            supportActionBar!!.setDisplayShowHomeEnabled(true)
            supportActionBar!!.setDisplayHomeAsUpEnabled(true)
        }
    }

    private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
        when (item.itemId) {
            R.id.navigation_home -> {
                toDashboard()
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_medicine -> {
                toMedicines()
                return@OnNavigationItemSelectedListener true
            }
            R.id.navigation_add_patient -> {
                toAddPatient()
                return@OnNavigationItemSelectedListener true
            }

            R.id.navigation_profile -> {
                toProfile()
                return@OnNavigationItemSelectedListener true
            }
        }
        false
    }

    private fun toProfile() {
        toggleToolBar(false)
//        navigation.selectedItemId = R.id.navigation_profile
        navigation.labelVisibilityMode = View.VISIBLE
        replaceFragment(ProfileFragment::class.java, PROFILE, false, null, R.id.frame_container)
    }

    private fun toAddPatient() {
        toggleToolBar(false)
//        navigation.selectedItemId = R.id.navigation_add_patient
        navigation.labelVisibilityMode = View.VISIBLE
        replaceFragment(AddPatientFragment::class.java, ADD_PATIENT, false, null, R.id.frame_container)
    }

    private fun toMedicines() {
        toggleToolBar(false)
//        navigation.selectedItemId = R.id.navigation_medicine
        navigation.labelVisibilityMode = View.VISIBLE
        replaceFragment(MedicineFragment::class.java, MEDICINE, false, null, R.id.frame_container)
    }

    private fun toDashboard() {
        toggleToolBar(false)
        navigation.labelVisibilityMode = View.VISIBLE
//        navigation.selectedItemId = R.id.navigation_home
        replaceFragment(HomeFragment::class.java, HOME, false, null, R.id.frame_container)
    }

    private fun toggleToolBar(value: Boolean) {
        supportActionBar?.setDisplayHomeAsUpEnabled(value)
        supportActionBar?.setDisplayShowHomeEnabled(value)
    }
}

<BottomNavigationView
 ....
 ....
 app:layout_behavior="@string/hide_bottom_view_on_scroll_behavior"/>