从最近的背景中删除应用程序后，应用程序中的暗模式不适用

Question

先看下图

[白色模式 1]https://i.stack.imgur.com/QKcju.jpg

[白色模式 2]https://i.stack.imgur.com/QKcju.jpg

[深色模式 1]https://i.stack.imgur.com/QKcju.jpg

[深色模式 2]https://i.stack.imgur.com/QKcju.jpg

问题是 -> 当我通过单击抽屉布局设置按钮打开黑暗 activity 并在按下黑暗按钮后黑暗模式应用于整个应用程序，当我从最近的背景中删除应用程序然后打开应用程序，然后白色模式自动应用于 activity 主页，但在从抽屉布局再次打开深色 activity 后，它自动应用深色模式。

这是我实现的代码

    const val FIRST_START = "FirstStart"
    const val NIGHT_MODE = "NightMode"
    const val PREF = "AppSettingsPrefs"
    class language_settings : AppCompatActivity() {
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            loadLocate() // call LoadLocate
            setContentView(R.layout.activity_language_settings)
    
            //save preferences specific to an app, like save the dark mode again when we again 
    open the app
            val appSettingsPrefs: SharedPreferences = getSharedPreferences(PREF, 0)
            val isNightModeOn: Boolean = appSettingsPrefs.getBoolean(NIGHT_MODE, false)
            val isFirstStart: Boolean = appSettingsPrefs.getBoolean(FIRST_START,false)
            //Create a new Editor for these preferences  through which you can make 
    modifications to
            // the data in the preferences and atomically commit those changes back to the                 
    SharedPreferences object
            val editor: SharedPreferences.Editor = appSettingsPrefs.edit()
    
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P && isFirstStart ){
    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
            }
            else{
                when {
                    isNightModeOn -> {
                        
    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
                    }
                    else -> {
                        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
                    }
                }
            }
            btnSwitch.setOnClickListener {
                if (isNightModeOn) {
                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO)
                    editor.putBoolean(FIRST_START, false)
                    editor.putBoolean(NIGHT_MODE, false)
                    editor.apply()
                    recreate() //recreate activity to make changes visible, onPause, onStop, 
    onDestroy, endAllActiveAnimators, onStart, onResume
                } else {
                    AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
                    editor.putBoolean(FIRST_START, false)
                    editor.putBoolean(NIGHT_MODE, true) 
                    editor.apply()
                    recreate() //recreate activity to make changes visible, onPause, onStop, 
    onDestroy, endAllActiveAnimators, onStart, onResume
    
                }
            }

please don't mind my english ;P

Answer 1

您需要在 super.onCreate(savedInstanceState) 之前调用 AppCompatDelegate.setDefaultNightMode(mode)。

从最近的背景中删除应用程序后，应用程序中的暗模式不适用

Dark mode in app is not applying after removing app from recent background

android

kotlin

sharedpreferences

android-appcompat

android-darkmode