底部導航欄浮動按鈕，動作覆寫整個螢屏-如何做到這一點？-有解無憂

我有一個帶有底部導航欄的 Android 應用程式。在主活動中，我有一個浮動按鈕，當我按下它時，我想打開一個片段（或另一個活動？），它將覆寫整個螢屏（底部導航欄和其他內容將在我新打開的片段下方）。我想補充一點，這個新打開的片段將用于添加一些專案，當用戶填寫名稱、體重等所有檔案并單擊“添加”時，片段應該關閉，我們應該看到底部導航欄它的碎片。

你能提供我的問題的解決方案嗎？我將不勝感激一些代碼能夠做到這一點！

以下是我的代碼中最重要的部分：

活動主.xml：

<?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:id="@ id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingTop="?attr/actionBarSize">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@ id/nav_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="0dp"
        android:layout_marginEnd="0dp"
        android:background="?android:attr/windowBackground"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

    <fragment
        android:id="@ id/nav_host_fragment_activity_main"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="1.0"
        app:navGraph="@navigation/mobile_navigation" />

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@ id/buttonAdd"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="84dp"
        android:contentDescription="@string/add_button"
        android:src="@drawable/ic_add"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.kt：

package com.example.myapp

import android.os.Bundle
import android.view.View
import com.google.android.material.bottomnavigation.BottomNavigationView
import androidx.appcompat.app.AppCompatActivity
import androidx.navigation.findNavController
import androidx.navigation.ui.AppBarConfiguration
import androidx.navigation.ui.setupActionBarWithNavController
import androidx.navigation.ui.setupWithNavController
import com.example.myapp.databinding.ActivityMainBinding
import com.example.myapp.ui.AddProductFragment
import com.google.android.material.snackbar.Snackbar

class MainActivity : AppCompatActivity() {

    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        val navView: BottomNavigationView = binding.navView

        val navController = findNavController(R.id.nav_host_fragment_activity_main)
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        val appBarConfiguration = AppBarConfiguration(setOf(
                R.id.navigation_expiring, R.id.navigation_storages, R.id.navigation_notifications))
        setupActionBarWithNavController(navController, appBarConfiguration)
        navView.setupWithNavController(navController)

        // floating button:
        val buttonAdd: View = findViewById(R.id.buttonAdd)
        buttonAdd.setOnClickListener {
            //navigate(R.id.action_login_to_registration)
            //view.findNavController().navigate(R.id.actionAddProduct)
            supportFragmentManager
                .beginTransaction().add(R.id.nav_host_fragment_activity_main, AddProductFragment())
                .commit()
        }
    }
}

fragment_storages.xml：（我已經擁有的其他片段幾乎相同）

<?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"
    tools:context=".ui.storages.StoragesFragment">

    <TextView
        android:id="@ id/text_dashboard"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:textAlignment="center"
        android:textSize="20sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

StoragesFragment.kt：（我已經擁有的其他片段幾乎一樣）

package com.example.myapp.ui.storages

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.fragment.app.Fragment
import androidx.lifecycle.ViewModelProvider
import com.example.myapp.databinding.FragmentStoragesBinding

class StoragesFragment : Fragment() {

    private var _binding: FragmentStoragesBinding? = null

    // This property is only valid between onCreateView and
    // onDestroyView.
    private val binding get() = _binding!!

    override fun onCreateView(
            inflater: LayoutInflater,
            container: ViewGroup?,
            savedInstanceState: Bundle?
    ): View {
        val dashboardViewModel =
                ViewModelProvider(this).get(StoragesViewModel::class.java)

        _binding = FragmentStoragesBinding.inflate(inflater, container, false)
        val root: View = binding.root

        val textView: TextView = binding.textDashboard
        dashboardViewModel.text.observe(viewLifecycleOwner) {
            textView.text = it
        }
        return root
    }

    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null
    }
}

片段添加產品.xml：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.AddProductFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Add Product Fragment" />

</androidx.constraintlayout.widget.ConstraintLayout>

AddProductFragment.kt：

package com.example.myapp.ui

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import com.example.myapp.R

class AddProductFragment : Fragment() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    }

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_add_product, container, false)
    }
}

bottom_nav_menu.xml：

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@ id/navigation_expiring"
        android:icon="@drawable/ic_expiring"
        android:title="@string/title_expiring" />

    <item
        android:id="@ id/navigation_storages"
        android:icon="@drawable/ic_storages"
        android:title="@string/title_storages" />

    <item
        android:id="@ id/navigation_notifications"
        android:icon="@drawable/ic_notifications_black_24dp"
        android:title="@string/title_notifications" />

</menu>

mobile_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/mobile_navigation"
    app:startDestination="@ id/navigation_expiring">

    <fragment
        android:id="@ id/navigation_expiring"
        android:name="com.example.myapp.ui.expiring.ExpiringFragment"
        android:label="@string/title_expiring"
        tools:layout="@layout/fragment_expiring" >
    </fragment>

    <fragment
        android:id="@ id/navigation_storages"
        android:name="com.example.myapp.ui.storages.StoragesFragment"
        android:label="@string/title_storages"
        tools:layout="@layout/fragment_storages" />

    <fragment
        android:id="@ id/navigation_notifications"
        android:name="com.example.myapp.ui.notifications.NotificationsFragment"
        android:label="@string/title_notifications"
        tools:layout="@layout/fragment_notifications" />

    <fragment
        android:id="@ id/navigation_add_product"
        android:name="com.example.myapp.ui.AddProductFragment"
        android:label="Add product"
        tools:layout="@layout/fragment_notifications" />

</navigation>

uj5u.com熱心網友回復：

不要導航到片段，而是在單擊“添加”浮動操作按鈕后嘗試啟動另一個 Activity。您的新活動不會像您預期的那樣有底部導航欄。

轉載請註明出處，本文鏈接：https://www.uj5u.com/qukuanlian/451919.html

標籤：安卓科特林安卓片段底部导航视图底部导航栏

上一篇：KotlinE/RecyclerView：沒有附加配接器；跳過布局

下一篇：NoSuchMethodError（NoSuchMethodError：在null上呼叫了方法“[]”。接收方：null嘗試呼叫：[]（0））