[英]How to remove bottom navigation bar from login screen
嗨,我在大學項目中遇到了一個問題。 在上圖中,您可以看到在我的登錄屏幕中有一個底部導航欄,我想將其刪除,但我嘗試過的所有內容都以編譯問題告終。 我的 MainActivity.KT 是
package com.example.integratedmodulateoroperationroom
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import androidx.navigation.NavController
import androidx.navigation.fragment.NavHostFragment
import androidx.navigation.fragment.findNavController
import androidx.navigation.ui.*
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)
bottom_nav.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()
}
}
Main_Activity.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_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/design_default_color_primary"
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_width="match_parent"
android:layout_height="0dp"
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_width="match_parent"
android:layout_height="wrap_content"
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_width="wrap_content"
android:layout_height="match_parent" />
</androidx.drawerlayout.widget.DrawerLayout>
登錄片段.KT
package com.example.integratedmodulateoroperationroom
import android.os.Bundle
import android.view.View
import androidx.fragment.app.Fragment
import androidx.navigation.fragment.findNavController
import kotlinx.android.synthetic.main.fragment_login.*
class LoginFragment : Fragment (R.layout.fragment_login) {
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
button_goToHomeScreen.setOnClickListener {
val action = LoginFragmentDirections.actionLoginFragmentToHomeFragment()
findNavController().navigate(action)
}
}
}
片段登錄
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".LoginFragment">
<EditText
android:id="@+id/editTextTextPersonName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Login ID"
android:inputType="textPersonName"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/editTextTextPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:ems="10"
android:hint="Password"
android:inputType="textPassword"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editTextTextPersonName" />
<Button
android:id="@+id/button_goToHomeScreen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="24dp"
android:text="Login"
app:backgroundTint="#9E9E9E"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editTextTextPassword" />
<ImageView
android:id="@+id/imageView4"
android:layout_width="0dp"
android:layout_height="274dp"
android:layout_marginStart="16dp"
android:layout_marginLeft="16dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:src="@drawable/logo"
app:layout_constraintBottom_toTopOf="@+id/editTextTextPersonName"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
導航圖
<?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/homeFragment">
<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" />
</fragment>
</navigation>
NavController
提供了一個OnDestinationChangedListener
接口,當 NavController 的當前目的地或其 arguments 發生變化時調用該接口,可用於在您在片段之間導航時更新 UI 元素,例如BottomNavigationBar
。
MainActivity.KT
// in oncreate
private val bottomNavigationView = findViewById<BottomNavigationView>(R.id.bottom_nav)
navController.addOnDestinationChangedListener { _, destination, _ ->
bottomNavigationView.visibility = if(destination.id == R.id.loginFragment) {
View.GONE
} else {
View.VISIBLE
}
}
您可以在活動的 onCreate 中執行類似的操作。 When ever an item in the nav bar is selected it will show or hide the nav based on the fragment id's.
private fun setupNav() {
val navController = findNavController(R.id.nav_host_fragment)
findViewById<BottomNavigationView>(R.id.bottomNav)
.setupWithNavController(navController)
navController.addOnDestinationChangedListener { _, destination, _ ->
when (destination.id) {
R.id.mainFragment -> showBottomNav()
R.id.mineFragment -> showBottomNav()
else -> hideBottomNav()
}
}
}
private fun showBottomNav() {
bottomNav.visibility = View.VISIBLE
}
private fun hideBottomNav() {
bottomNav.visibility = View.GONE
}
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