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    override suspend fun startCountDown(count: Int) {
        // 10 seconds for count down
        // 100 is a finer number that makes progress run smoother than normal
        val countTime = count * 100
        repeat(countTime) {
            // In case of 10 seconds count down
            // The timer will display as 10 -> 9 -> 8 -> 7 -> 6 -> 5 -> 4 -> 3 -> 2 -> 1 -> 0
            // So it must plus 1
            val displaySeconds = countTime.minus(it).div(100).plus(1)

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class ProgressBarViewModel @ViewModelInject constructor(
    private val progressBarRepository: ProgressBarRepository
) : ViewModel() {

    // Display seconds
    val countDown: LiveData<String> = progressBarRepository.data.map {
        it.time.toString()
    }.asLiveData().distinctUntilChanged()

    // Progress state of circle bar

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interface ProgressBarRepository {
    val data: Flow<Int>
    suspend fun startCountDown(count: Int)
}


class ProgressBarRepositoryImpl @Inject constructor() : ProgressBarRepository {
    private val _data: MutableStateFlow<Int?> = MutableStateFlow(null)
    override val data: Flow<Int>
        get() = _data.filterNotNull()

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@AndroidEntryPoint
class NextScreenFragment : Fragment(R.layout.fragment_next_screen) {

    private val navigation: NavController by lazy {
        findNavController()
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        observeViewModel()

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@AndroidEntryPoint
class MediumFragment : Fragment(R.layout.fragment_medium) {

    private val navigation: NavController by lazy {
        findNavController()
    }
    
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        observeNavigationCallBack()

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    private val modeChangeListener =
        Preference.OnPreferenceChangeListener { preference, newValue ->
            Log.i("newValue", newValue.toString())
            newValue as? String
            when (newValue) {
                getString(R.string.pf_light_on) -> {
                    updateTheme(AppCompatDelegate.MODE_NIGHT_YES)
                }
                getString(R.string.pf_light_off) -> {
                    updateTheme(AppCompatDelegate.MODE_NIGHT_NO)

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<?xml version="1.0" encoding="utf-8"?>
<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <ListPreference
        android:defaultValue="@string/pf_dark_auto"
        android:dialogTitle="@string/pf_dark_dialog"
        android:entries="@array/light_theme"
        android:entryValues="@array/light_theme_value"
        app:key="@string/pf_key_light"

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<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="light_theme">
        <item>@string/light_mode_auto</item>
        <item>@string/light_mode_on</item>
        <item>@string/light_mode_off</item>
    </string-array>
    <string-array name="light_theme_value">
        <item>@string/pf_dark_auto</item>
        <item>@string/pf_light_on</item>

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