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Android shared preference observer using kotlin coroutines (1.3.0)
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inline fun <reified T> SharedPreferences.observeKey(key: String, default: T): Flow<T> { | |
val flow = MutableStateFlow(getItem(key, default)) | |
val listener = SharedPreferences.OnSharedPreferenceChangeListener { _, k -> | |
if (key == k) { | |
flow.value = getItem(key, default)!! | |
} | |
} | |
registerOnSharedPreferenceChangeListener(listener) | |
return flow | |
.onCompletion { unregisterOnSharedPreferenceChangeListener(listener) } | |
} | |
inline fun <reified T> SharedPreferences.getItem(key: String, default: T): T { | |
@Suppress("UNCHECKED_CAST") | |
return when (default){ | |
is String -> getString(key, default) as T | |
is Int -> getInt(key, default) as T | |
is Long -> getLong(key, default) as T | |
is Boolean -> getBoolean(key, default) as T | |
is Float -> getFloat(key, default) as T | |
is Set<*> -> getStringSet(key, default as Set<String>) as T | |
is MutableSet<*> -> getStringSet(key, default as MutableSet<String>) as T | |
else -> throw IllegalArgumentException("generic type not handle ${T::class.java.name}") | |
} | |
} |
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