如何强制应用程序遵循手机的系统语言？

Question

在应用程序设置中，我有一个RadioGroup，其中包含四个RadioButton，每个RadioButton都标有特定的语言名称，最后一个标有“自动（取决于设备语言）”。

activity_settings.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:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/a10"
tools:context=".Settings">

<TextView
    android:id="@+id/textView13"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:fontFamily="@font/tajawal_medium"
    android:text="@string/settings"
    android:textColor="@color/a1"
    android:textSize="30sp"
    android:textStyle="bold"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/textView14"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="20dp"
    android:layout_marginTop="40dp"
    android:fontFamily="@font/tajawal"
    android:text="@string/language"
    android:textColor="@color/a1"
    android:textSize="20sp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView13" />

<RadioGroup
    android:id="@+id/languages"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="20dp"
    android:layout_marginTop="20dp"
    app:layout_constraintStart_toStartOf="@+id/textView14"
    app:layout_constraintTop_toBottomOf="@+id/textView14">

    <RadioButton
        android:id="@+id/ar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/arabic" />

    <RadioButton
        android:id="@+id/en"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/english" />

    <RadioButton
        android:id="@+id/fr"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/français" />

    <RadioButton
        android:id="@+id/auto_lang"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/auto_lang" />
</RadioGroup>

<TextView
    android:id="@+id/textView15"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="20dp"
    android:layout_marginTop="40dp"
    android:fontFamily="@font/tajawal"
    android:text="@string/mode"
    android:textColor="@color/a1"
    android:textSize="20sp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@id/languages" />

<RadioGroup
    android:id="@+id/modes"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="20dp"
    android:layout_marginTop="20dp"
    app:layout_constraintStart_toStartOf="@id/textView15"
    app:layout_constraintTop_toBottomOf="@id/textView15">

    <RadioButton
        android:id="@+id/dark"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/dark_mode" />

    <RadioButton
        android:id="@+id/light"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/light_mode" />

    <RadioButton
        android:id="@+id/auto_mode"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/auto_mode" />
</RadioGroup>

<Button
    android:id="@+id/save"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="20dp"
    android:backgroundTint="@color/a5"
    android:fontFamily="@font/tajawal_medium"
    android:text="@string/save"
    android:textColor="@color/a1"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent" />

 </androidx.constraintlayout.widget.ConstraintLayout>

设置.kt：

package com.example.quranprompter

import android.content.Context
import android.content.Intent
import android.content.SharedPreferences
import android.content.res.Configuration
import android.media.VolumeShaper
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.preference.PreferenceManager
import android.view.View
import android.widget.Button
import android.widget.RadioButton
import android.widget.RadioGroup
import android.widget.Toast
import androidx.appcompat.app.AppCompatDelegate
import java.util.Locale


class Settings : BaseActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_settings)

    val buSave = findViewById<Button>(R.id.save)

    val currentLocale = resources.configuration.locale
    val currentLanguage = currentLocale.language
    val preferences = PreferenceManager.getDefaultSharedPreferences(this)
    val a = preferences.edit()
    val selectedLanguage = preferences.getString("language", "en")
    val currentMode = preferences.getString("mode", 
    AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM.toString())

    //RadioButton of Languages
    val ar = findViewById<RadioButton>(R.id.ar)
    val en = findViewById<RadioButton>(R.id.en)
    val fr = findViewById<RadioButton>(R.id.fr)
    val auLa = findViewById<RadioButton>(R.id.auto_lang)

    when(selectedLanguage){
        "ar" -> ar.isChecked = true
        "en" -> en.isChecked = true
        "fr" -> fr.isChecked = true
        else -> auLa.isChecked = true
    }

    //RadioButton Modes
    var dark = findViewById<RadioButton>(R.id.dark)
    var light = findViewById<RadioButton>(R.id.light)
    var auMo = findViewById<RadioButton>(R.id.auto_mode)

    when(currentMode){
        AppCompatDelegate.MODE_NIGHT_YES.toString() ->
            dark.isChecked = true
        AppCompatDelegate.MODE_NIGHT_NO.toString() ->
            light.isChecked = true
        AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM.toString() ->
            auMo.isChecked = true
    }
    //Save Button
    buSave.setOnClickListener {
        //Languages
        var codeLang : String = "en"
        if(ar.isChecked){
            codeLang = "ar"
        }else if(en.isChecked){
            codeLang = "en"
        }else if(fr.isChecked){
            codeLang = "fr"
        }else if(auLa.isChecked){
            codeLang = Locale.getDefault().toString()
        }

        val locale = Locale(codeLang)
        Locale.setDefault(locale)
        val configuration = Configuration()
        configuration.locale = locale
        resources.updateConfiguration(configuration, resources.displayMetrics)
        a.putString("language",codeLang )
        a.apply()


        //Modes
        var codeMode : String = AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM.toString()
        if(dark.isChecked){
            codeMode = AppCompatDelegate.MODE_NIGHT_YES.toString()
        }else if(light.isChecked){
            codeMode = AppCompatDelegate.MODE_NIGHT_NO.toString()
        }else if(auMo.isChecked){
            codeMode = AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM.toString()
        }

        AppCompatDelegate.setDefaultNightMode(codeMode.toInt())
        a.putString("mode",codeMode)
        a.apply()

        val intent = Intent(applicationContext, Levels::class.java)
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
        startActivity(intent)
        finish()
    }
}
}

注意：按下保存按钮后，您将在语言之间切换。

语言之间的切换很顺利，而如果您想切换到设备语言，则使用应用程序中的最后一种语言。

例如，如果应用程序是法语，手机是英语，您选择“自动（取决于设备语言）”然后保存，则会应用法语，但我想应用手机语言。

我认为此代码不适合在这种情况下检索手机的语言代码。

                codeLang = Locale.getDefault().toString()

Answer 1

使用它来获取设备当前语言：

Resources.getSystem().configuration.locale.language

在您的代码中，单击“自动”时将其替换为：

   // ....
        else if(auLa.isChecked){
                codeLang = Resources.getSystem().configuration.locale.language
            }
    // ....