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luks91/StreamingSharedPreference.kt

Last active April 29, 2018 18:05
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StreamingSharedPreference.kt
private fun sharedPreferenceValues(preferences: SharedPreferences, key: String): Flowable<String> =
Flowable.create({ emitter ->
val emitCurrentKey = { emitter.onNext(preferences.getString(key, "")) }
val preferencesListener = SharedPreferences.OnSharedPreferenceChangeListener { _, updatedKey ->
if (TextUtils.equals(key, updatedKey)) {
emitCurrentKey()
}
}
preferences.registerOnSharedPreferenceChangeListener(preferencesListener)
emitCurrentKey()
emitter.setCancellable { preferences.unregisterOnSharedPreferenceChangeListener(preferencesListener) }
}, BackpressureStrategy.LATEST)
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