android - 欢迎屏幕没有显示，而是显示导航菜单？
问题描述
当我第一次启动应用程序时，我正在开发 android carrentup，它显示导航菜单而不是欢迎屏幕。我在用户启动应用程序时使用喷气背包导航，它必须在成功登录后显示欢迎屏幕，它必须在我的 mainactivity.kt 下方显示导航菜单
class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener {
private lateinit var appBarConfiguration: AppBarConfiguration
lateinit var binding: ActivityMainBinding
lateinit var navController: NavController
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
val toolbar: Toolbar = findViewById(R.id.toolbar)
setSupportActionBar(toolbar)
supportActionBar?.setBackgroundDrawable(ColorDrawable(resources.getColor(R.color.white)));
navController = findNavController(R.id.nav_host_fragment)
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
appBarConfiguration = AppBarConfiguration(navController.graph, binding.drawerLayout)
setupActionBarWithNavController(navController, appBarConfiguration)
binding.navView.setupWithNavController(navController)
binding.navView.setNavigationItemSelectedListener(this)
}
override fun onSupportNavigateUp(): Boolean {
val navController = findNavController(R.id.nav_host_fragment)
return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
}
override fun onNavigationItemSelected(item: MenuItem): Boolean {
when (item.itemId) {
R.id.cars_fragment -> {
navController.navigate(R.id.action_global_carsMainFragment)
}
R.id.my_history_rides -> {
navController.navigate(R.id.action_global_myHistoryRidesFragment)
}
R.id.email_us -> {
navController.navigate(R.id.action_global_emailUsFragment)
}
R.id.information -> {
navController.navigate(R.id.action_global_informationFragment)
}
}
binding.drawerLayout.close()
return false
}
}
在我的 activity_main.xml 下面
<?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"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<com.google.android.material.navigation.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="@layout/nav_header_navigation_view"
app:menu="@menu/activity_main_drawer" />
</androidx.drawerlayout.widget.DrawerLayout>
下面的navigation.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/navigation"
app:startDestination="@id/carsMainFragment">
<fragment
android:id="@+id/mainFragment"
android:name="com.example.digiandroidapp.ui.main.MainFragment"
android:label="MainFragment">
<action
android:id="@+id/action_mainFragment_to_loginFragment"
app:destination="@id/loginFragment"
app:enterAnim="@anim/slide_in_from_right"
app:exitAnim="@anim/slide_out_to_left"
app:popEnterAnim="@anim/slide_in_from_left"
app:popExitAnim="@anim/slide_out_to_right" />
<action
android:id="@+id/action_mainFragment_to_signUpFragment"
app:destination="@id/signUpFragment"
app:enterAnim="@anim/slide_in_from_right"
app:exitAnim="@anim/slide_out_to_left"
app:popEnterAnim="@anim/slide_in_from_left"
app:popExitAnim="@anim/slide_out_to_right" />
<action
android:id="@+id/action_mainFragment_to_detailsFragment"
app:destination="@id/detailsFragment" />
</fragment>
<fragment
android:id="@+id/loginFragment"
android:name="com.example.digiandroidapp.ui.login.LoginFragment"
android:label="LoginFragment">
<action
android:id="@+id/action_loginFragment_to_signUpFragment"
app:destination="@id/signUpFragment"
app:enterAnim="@anim/slide_in_from_right"
app:exitAnim="@anim/slide_out_to_left"
app:popEnterAnim="@anim/slide_in_from_left"
app:popExitAnim="@anim/slide_out_to_right" />
</fragment>
<fragment
android:id="@+id/signUpFragment"
android:name="com.example.digiandroidapp.ui.signup.SignUpFragment"
android:label="SignUpFragment">
<action
android:id="@+id/action_signUpFragment_to_loginFragment"
app:destination="@id/loginFragment"
app:enterAnim="@anim/slide_in_from_right"
app:exitAnim="@anim/slide_out_to_left"
app:popEnterAnim="@anim/slide_in_from_left"
app:popExitAnim="@anim/slide_out_to_right" />
</fragment>
<fragment
android:id="@+id/carsMainFragment"
android:name="com.example.digiandroidapp.ui.navigation_view.ui.cars.CarsMainFragment"
android:label="Car Rental" >
<action
android:id="@+id/action_carsMainFragment_to_detailsFragment"
app:destination="@id/detailsFragment" />
</fragment>
<action
android:id="@+id/action_global_carsMainFragment"
app:destination="@id/carsMainFragment"
app:enterAnim="@anim/slide_in_from_right"
app:exitAnim="@anim/slide_out_to_left"
app:popEnterAnim="@anim/slide_in_from_left"
app:popExitAnim="@anim/slide_out_to_right" />
<fragment
android:id="@+id/detailsFragment"
android:name="com.example.digiandroidapp.ui.details.CarDetailsFragment"
android:label="Car details"
tools:layout="@layout/fragment_details" >
<action
android:id="@+id/action_detailsFragment_to_selectDateFragment"
app:destination="@id/selectDateFragment" />
<action
android:id="@+id/action_detailsFragment_to_selectLocationFragment"
app:destination="@id/selectLocationFragment" />
</fragment>
<fragment
android:id="@+id/selectDateFragment"
android:name="com.example.digiandroidapp.ui.details.date.SelectDateFragment"
android:label="fragment_select_date"
tools:layout="@layout/fragment_select_date" />
<fragment
android:id="@+id/selectLocationFragment"
android:name="com.example.digiandroidapp.ui.details.location.SelectLocationFragment"
android:label="fragment_select_location"
tools:layout="@layout/fragment_select_location" />
<fragment
android:id="@+id/informationFragment"
android:name="com.example.digiandroidapp.ui.navigation_view.ui.information.InformationFragment"
android:label="Information"
tools:layout="@layout/fragment_information" />
<action android:id="@+id/action_global_informationFragment" app:destination="@id/informationFragment" />
<fragment
android:id="@+id/emailUsFragment"
android:name="com.example.digiandroidapp.ui.navigation_view.ui.mail.EmailUsFragment"
android:label="fragment_email_us"
tools:layout="@layout/fragment_email_us" />
<action android:id="@+id/action_global_emailUsFragment" app:destination="@id/emailUsFragment" />
<fragment
android:id="@+id/myHistoryRidesFragment"
android:name="com.example.digiandroidapp.ui.navigation_view.ui.my_history_rides.MyHistoryRidesFragment"
android:label="My Rides History"
tools:layout="@layout/fragment_my_history_rides" /><action android:id="@+id/action_global_myHistoryRidesFragment" app:destination="@id/myHistoryRidesFragment"/>
</navigation>
在 MainFragment 下面
class MainFragment : Fragment() {
private var _binding: WelcomeFragmentBinding? = null
private val binding get() = _binding!!
private val preferenceHelper by lazy { PreferenceHelper.defaultPreference(requireContext()) }
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View {
_binding = WelcomeFragmentBinding.inflate(layoutInflater, container, false)
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
if (preferenceHelper.token != "") {
this.navigate(R.id.action_global_carsMainFragment)
}
navigate()
}
private fun navigate() {
binding.login.setOnClickListener {
findNavController().navigate(R.id.action_mainFragment_to_loginFragment)
}
binding.signUp.setOnClickListener {
findNavController().navigate(R.id.action_mainFragment_to_signUpFragment)
}
}
override fun onDestroyView() {
super.onDestroyView()
_binding = null
}
}
在welcome_fragment.xml下面
<?xml version="1.0" encoding="utf-8"?>
<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">
<TextView
android:id="@+id/digitalTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="80dp"
android:fontFamily="@font/roboto_black"
android:text="@string/digilab"
android:textColor="@color/primaryBlack"
android:textSize="48sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/rentCar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="@string/rent_car_fo"
android:textSize="18sp"
android:fontFamily="@font/roboto_black"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/digitalTitle" />
<ImageView
android:id="@+id/skodaImage"
android:layout_width="260dp"
android:layout_height="260dp"
android:layout_marginTop="16dp"
android:contentDescription="@string/email"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/rentCar"
app:srcCompat="@drawable/image_skoda" />
<Button
android:id="@+id/login"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="16dp"
android:text="@string/login"
android:padding="16dp"
android:fontFamily="@font/roboto_black"
android:backgroundTint="@color/primaryButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/skodaImage" />
<com.google.android.material.button.MaterialButton
android:id="@+id/signUp"
style="@style/Widget.MaterialComponents.Button.TextButton"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:backgroundTint="@color/white"
android:fontFamily="@font/roboto_black"
android:padding="16dp"
android:text="@string/sign_up"
android:textColor="@color/primaryButton"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="@+id/login"
app:layout_constraintStart_toStartOf="@+id/login"
app:layout_constraintTop_toBottomOf="@+id/login"
app:layout_constraintVertical_bias="0.120000005" />
</androidx.constraintlayout.widget.ConstraintLayout>
解决方案
我错过了在导航中添加欢迎片段
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