目前我正在开发一个Android应用程序,我想在其中同时利用Android Navigation Component
and BottomNavigationView
.
在开发上述应用程序时,我签出了官方代码实验室这里有几个问题,但事实证明它们没有任何帮助。
问题是分配navController
to my BottomNavigationView
似乎没有任何效果 - 单击菜单项不会影响导航主机。
My code:
main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayoutxmlns: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=".MainActivity">
<androidx.fragment.app.FragmentContainerView
android:id="@+id/main_host_fr"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/nav_graph" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/main_nav_bnv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:background="@android:color/transparent"
android:elevation="0dp"
app:elevation="0dp"
app:menu="@menu/menu_main" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
MainActivity.kt
import android.os.Bundle
import android.os.PersistableBundle
import android.view.MenuItem
import androidx.appcompat.app.AppCompatActivity
import androidx.navigation.findNavController
import androidx.navigation.fragment.NavHostFragment
import androidx.navigation.ui.NavigationUI
import androidx.navigation.ui.setupWithNavController
import com.aredruss.qurio.databinding.ActivityMainBinding
import com.aredruss.qurio.helpers.viewBinding
class MainActivity : AppCompatActivity() {
// ViewBindingDelegate
private val binding: ActivityMainBinding by viewBinding(ActivityMainBinding::inflate)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
// Using onPostCreate because accessing NavHost in OnCreate causes crashes
override fun onPostCreate(savedInstanceState: Bundle?, persistentState: PersistableBundle?) {
super.onPostCreate(savedInstanceState, persistentState)
binding.navigationBb.setupWithNavController(findNavController(R.id.main_host_fr))
NavigationUI.setupWithNavController(binding.mainNavBnv, findNavController(R.id.main_host_fr))
}
}
nav_graph.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/action_history">
<fragment
android:id="@+id/action_history"
android:name="com.aredruss.qurio.ui.HistoryFragment"
android:label="HistoryFragment"
tools:layout="@layout/fragment_history" >
</fragment>
<fragment
android:id="@+id/action_settings"
android:name="com.aredruss.qurio.ui.SettingsFragment"
android:label="SettingsFragment"
tools:layout="@layout/fragment_settings" >
</fragment>
</navigation>
菜单_main.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="@+id/action_history"
android:icon="@drawable/ic_history"
android:title="History"
app:showAsAction="withText" />
<item
android:id="@+id/action_settings"
android:title="Settings"
android:icon="@drawable/ic_settings"
app:showAsAction="withText"
/>
</menu>
我已经结账了this https://stackoverflow.com/questions/53443965/setupwithnavcontroller-doest-work-for-toolbar/53444133解决方案,但没有任何帮助。