如何删除导航抽屉？
Posted
技术标签:
【中文标题】如何删除导航抽屉？【英文标题】：How to remove navigation drawer? 【发布时间】：2021-05-12 02:56:48 【问题描述】：我想从我的 fragment_login 和 fragment_create_account 片段中删除导航抽屉。我使用 addOnDestinationChangedListener 从这些片段中删除了底部导航和工具栏，工具栏代码如下：
navController.addOnDestinationChangedListener _, destination, _ ->
when(destination.id)
R.id.loginFragment, R.id.createAccountFragment ->
toolbar.visibility = View.GONE
else -> toolbar.visibility = View.VISIBLE
同样，对于底部导航：
navController.addOnDestinationChangedListener _, destination, _ ->
when(destination.id)
R.id.loginFragment, R.id.createAccountFragment ->
bottomNavigationView.visibility = View.GONE
else -> bottomNavigationView.visibility = View.VISIBLE
我尝试对导航抽屉执行相同的操作（与上述抽屉布局的代码相同），但没有成功，整个应用程序变为空白。任何帮助表示赞赏。
MainActivity.KT
package com.example.integratedmodulateoroperationroom
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.view.View
import androidx.navigation.NavController
import androidx.navigation.fragment.NavHostFragment
import androidx.navigation.fragment.findNavController
import androidx.navigation.ui.*
import com.google.android.material.bottomnavigation.BottomNavigationView
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity()
private lateinit var navController: NavController
private lateinit var appBarConfiguration: AppBarConfiguration
override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val navHostFragment =
supportFragmentManager.findFragmentById(R.id.nav_host_fragment) as NavHostFragment
navController = navHostFragment.findNavController()
appBarConfiguration = AppBarConfiguration(
setOf(R.id.homeFragment, R.id.loginFragment),
drawer_layout
)
setSupportActionBar(toolbar)
setupActionBarWithNavController(navController, appBarConfiguration)
navController.addOnDestinationChangedListener _, destination, _ ->
when(destination.id)
R.id.loginFragment, R.id.createAccountFragment ->
toolbar.visibility = View.GONE
else -> toolbar.visibility = View.VISIBLE
bottom_nav.setupWithNavController(navController)
val bottomNavigationView = findViewById<BottomNavigationView>(R.id.bottom_nav)
navController.addOnDestinationChangedListener _, destination, _ ->
when(destination.id)
R.id.loginFragment, R.id.createAccountFragment ->
bottomNavigationView.visibility = View.GONE
else -> bottomNavigationView.visibility = View.VISIBLE
nav_view.setupWithNavController(navController)
override fun onCreateOptionsMenu(menu: Menu?): Boolean
menuInflater.inflate(R.menu.options_menu, menu)
return true
override fun onOptionsItemSelected(item: MenuItem): Boolean
return item.onNavDestinationSelected(navController) || super.onOptionsItemSelected(item)
override fun onSupportNavigateUp(): Boolean
return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
activitymain.XML：
<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_
android:layout_
tools:context=".MainActivity">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_
android:layout_>
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_
android:layout_
android:background="@drawable/toolbar_backgroud"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<androidx.fragment.app.FragmentContainerView
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_
android:layout_
app:defaultNavHost="true"
app:layout_constraintBottom_toTopOf="@+id/bottom_nav"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/toolbar"
app:navGraph="@navigation/nav_graph" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_nav"
android:layout_
android:layout_
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:menu="@menu/bottom_nav_menu" />
</androidx.constraintlayout.widget.ConstraintLayout>
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_gravity="start"
app:menu="@menu/drawer_nav_menu"
android:layout_
android:layout_
app:headerLayout="@layout/drawer_header"/>
</androidx.drawerlayout.widget.DrawerLayout>
nav_grah.XML
<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/nav_graph"
app:startDestination="@id/loginFragment">
<fragment
android:id="@+id/homeFragment"
android:name="com.example.integratedmodulateoroperationroom.HomeFragment"
android:label="Integrated Module OR (Operation Room)"
tools:layout="@layout/fragment_home">
<action
android:id="@+id/action_homeFragment_to_otFragment"
app:destination="@id/otFragment"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right" />
<action
android:id="@+id/action_homeFragment_to_surgicalFragment"
app:destination="@id/surgicalFragment"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right" />
<action
android:id="@+id/action_homeFragment_to_laminarFragment"
app:destination="@id/laminarFragment" />
</fragment>
<fragment
android:id="@+id/otFragment"
android:name="com.example.integratedmodulateoroperationroom.OtFragment"
android:label="OT Lights"
tools:layout="@layout/fragment_ot" />
<fragment
android:id="@+id/surgicalFragment"
android:name="com.example.integratedmodulateoroperationroom.SurgicalFragment"
android:label="Surgical Lights"
tools:layout="@layout/fragment_surgical" />
<fragment
android:id="@+id/settingsFragment"
android:name="com.example.integratedmodulateoroperationroom.SettingsFragment"
android:label="Settings"
tools:layout="@layout/fragment_settings" />
<fragment
android:id="@+id/laminarFragment"
android:name="com.example.integratedmodulateoroperationroom.LaminarFragment"
android:label="Laminar Airflow"
tools:layout="@layout/fragment_laminar" />
<fragment
android:id="@+id/loginFragment"
android:name="com.example.integratedmodulateoroperationroom.LoginFragment"
android:label="Login"
tools:layout="@layout/fragment_login" >
<action
android:id="@+id/action_loginFragment_to_homeFragment"
app:destination="@id/homeFragment"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right"
app:popUpTo="@id/homeFragment"
app:popUpToInclusive="true" />
<action
android:id="@+id/action_loginFragment_to_createAccountFragment"
app:destination="@id/createAccountFragment" />
</fragment>
<fragment
android:id="@+id/aboutFragment"
android:name="com.example.integratedmodulateoroperationroom.AboutFragment"
android:label="About"
tools:layout="@layout/fragment_about" />
<fragment
android:id="@+id/createAccountFragment"
android:name="com.example.integratedmodulateoroperationroom.CreateAccountFragment"
android:label="CreateAccountFragment"
tools:layout="@layout/fragment_create_account">
<action
android:id="@+id/action_createAccountFragment_to_loginFragment"
app:destination="@id/loginFragment"
app:popUpTo="@id/loginFragment"
app:popUpToInclusive="true" />
</fragment>
</navigation>
【问题讨论】：
你不要，把它锁起来。 【参考方案1】：我不明白你要做什么，但你可以通过删除资源/菜单文件中的 menu.xml 来删除它。
不要忘记清理 XML 和类以避免任何错误。
如果您只是想从 UI 中隐藏它们，您可以通过设置可见性来做到这一点。
另一种方法是从主机屏幕中删除设置菜单。
【讨论】：
实际上我有多个片段，我试图从两个片段中删除它。我尝试设置可见性，但随后整个应用程序变为空白......如果你能展示如何设置可见性会很棒......我想我可能做错了什么 也许你应该创建一个回调来告诉主机屏幕隐藏底部导航，如果这个片段出现在用户面前。【参考方案2】：我不知道我必须锁定导航抽屉。所以，通过使用
drawer_layout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
我成功隐藏了导航抽屉。所以，为了让它出现在其余的片段中，我使用了下面的代码：
navController.addOnDestinationChangedListener _, destination, _ ->
when(destination.id)
R.id.loginFragment, R.id.createAccountFragment ->
drawer_layout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
else -> drawer_layout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
【讨论】：
以上是关于如何删除导航抽屉？的主要内容，如果未能解决你的问题，请参考以下文章