我在我的 Android Studio 应用程序中添加了一个带有日/夜模式主题的选项菜单，但点击日间模式会关闭应用程序

问题描述

我创建了一个待办事项列表应用程序。我添加了一个选项菜单来在白天和夜间模式之间切换，但有两个问题：

点击夜间模式只会改变应用程序的操作栏和周围环境，而不会改变应用程序本身
点击日间模式会关闭应用。我怎样才能让它发挥作用？

AndroidManifest.xml

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.AppCompat.DayNight.DarkActionBar">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

main_menu.xml

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

    <item
        android:id="@+id/night_mode"
        android:title="@string/night_mode"/>

</menu>

themes.xml

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Theme.TodoListAppD" parent="Theme.AppCompat.DayNight.DarkActionBar">
        <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/white</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_700</item>
        <item name="colorOnSecondary">@color/black</item>
        <!-- Status bar color. -->
        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
        <!-- Customize your theme here. -->
    </style>
</resources>

MainActivity.kt

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.view.View
import android.widget.EditText
import android.widget.ListView
import android.widget.Toast
import androidx.appcompat.app.AlertDialog
import androidx.appcompat.app.AppCompatDelegate
import com.google.android.material.floatingactionbutton.FloatingActionButton
import com.google.firebase.database.*

class MainActivity : AppCompatActivity(),UpdateAndDelete {
    lateinit var database:DatabaseReference
    var todoList: MutableList<TodoModel>? = null
    private lateinit var adapter: TodoAdapter
    private var listViewItem :ListView?=null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val fab=findViewById<View>(R.id.fab) as FloatingActionButton
        listViewItem = findViewById(R.id.item_listView)

        database = FirebaseDatabase.getInstance().reference

        fab.setonClickListener {
            val alertDialog = AlertDialog.Builder(this)
            val textEditText = EditText(this)
            alertDialog.setMessage("Add Todo item")
            alertDialog.setTitle("Enter To Do item")
            alertDialog.setView(textEditText)
            alertDialog.setPositiveButton("Add") { dialog,_ ->
                val todoItemData = TodoModel.createList()
                todoItemData.itemDataText = textEditText.text.toString()
                todoItemData.done = false

                val newItemData= database.child("todo").push()
                todoItemData.UID = newItemData.key

                newItemData.setValue(todoItemData)

                dialog.dismiss()
                Toast.makeText(this,"item saved",Toast.LENGTH_LONG).show()

            }
            alertDialog.show()
        }

        todoList= mutablelistof()
        adapter= TodoAdapter(this,todoList!!)
        listViewItem!!.adapter=adapter
        database.addValueEventListener(object : ValueEventListener {
            override fun onDataChange(snapshot: DataSnapshot) {
                todoList!!.clear()
                addItemToList(snapshot)
            }

            override fun onCancelled(error: DatabaseError) {
                Toast.makeText(applicationContext,"No item Added",Toast.LENGTH_LONG).show()
            }

        })
    }

    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
        menuInflater.inflate(R.menu.main_menu,menu)
        val nightMode = AppCompatDelegate.getDefaultNightMode()
        if (nightMode == AppCompatDelegate.MODE_NIGHT_YES){
            menu?.findItem(R.id.night_mode)?.setTitle(R.string.day_mode)
        } else{
            menu?.findItem(R.id.night_mode)?.setTitle(R.string.night_mode)
        }
        return true
    }

    override fun onoptionsItemSelected(item: MenuItem): Boolean {
        if(item.itemId ==R.id.night_mode){
            val nightMode = AppCompatDelegate.getDefaultNightMode()
            if (nightMode == AppCompatDelegate.MODE_NIGHT_YES) {
                AppCompatDelegate.setDefaultNightMode(
                    AppCompatDelegate.MODE_NIGHT_NO)
            } else {
                AppCompatDelegate.setDefaultNightMode(
                    AppCompatDelegate.MODE_NIGHT_YES)
            }
        }
        recreate()
            return true
    }

    private fun addItemToList(snapshot: DataSnapshot) {

        val items = snapshot.children.iterator()

        if (items.hasNext()) {

            val todoIndexedValue = items.next()
            val itemsIterator = todoIndexedValue.children.iterator()

            while (itemsIterator.hasNext()) {

                val currentItem = itemsIterator.next()
                val todoItemData= TodoModel.createList()
                val map =currentItem.value as HashMap<*,*>

                todoItemData.UID = currentItem.key
                todoItemData.done= map["done"] as Boolean?
                todoItemData.itemDataText= map["itemDataText"] as String?
                todoList!!.add(todoItemData)
            }
        }

        adapter.notifyDataSetChanged()
    }

    override fun modifyItem(itemUID: String,isDone: Boolean) {
        val itemReference =database.child("todo").child(itemUID)
        itemReference.child("done").setValue(isDone)

    }

    override fun onItemDelete(itemUID: String) {
        val itemReference =database.child("todo").child(itemUID)
        itemReference.removeValue()
        adapter.notifyDataSetChanged()
    }
}

Image before you choose night mode from menu

With night mode selected

我认为整个白色部分也会变成夜间模式。我怎么做？以及如何让应用在不关闭应用的情况下切换回日间模式？

解决方法

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android-night-mode android-studio kotlin kotlin kotlin