Androidでの起動判定をDataStoreを使用して実施
忘備録としてプログラムの一部を記載
DataStoreが安定版の1.0.0
// Preferences DataStore
implementation 'androidx.datastore:datastore-preferences:1.0.0'
implementation 'androidx.datastore:datastore-preferences-core:1.0.0'
DataStoreSetting.kt
val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = "DataStoreSetting")
class DataStoreSetting {
object PreferenceKey {
val START_FLAG = booleanPreferencesKey("StartFlag")
}
// 起動フラグの取得
suspend fun getFlag(context: Context): Boolean {
// DataStoreからフラグを取得
val flagFlow: Flow<Boolean> = context.dataStore.data
.catch { exception ->
if (exception is IOException) {
emit(emptyPreferences())
} else {
throw exception
}
}.map { preferences ->
// デフォルト値：false
preferences[PreferenceKey.START_FLAG] ?: false
}
// 起動フラグ取得
val flag = flagFlow.first()
return flag
}
// 起動フラグの設定
fun setFlag(context: Context) {
CoroutineScope(Dispatchers.Main).launch {
context.dataStore.edit { setting ->
setting[PreferenceKey.START_FLAG] = true
}
}
}
}
Fragment
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
// 非同期処理
CoroutineScope(Dispatchers.Main).launch {
val intent: Intent
// 起動フラグ
val startFlag = dataStoreSetting.getSetupCompletedFlag(requireContext())
intent = if (startFlag) {
Intent(activity, SecondActivity::class.java)
} else {
Intent(activity, FirstActivity::class.java)
}
}
dataStoreSetting.setFlag(requireContext())
startActivity(intent)
}
参考サイト：
https://developer.android.com/topic/libraries/architecture/datastore?hl=ja
https://developer.android.com/codelabs/android-preferences-datastore?hl=ja#0
https://zenn.dev/slowhand/articles/455aa5cd244e90
https://akira-watson.com/android/sharedpreferences.html
https://stackoverflow.com/questions/67265984/is-it-possible-to-read-write-primitive-types-from-datastore-without-flows
