Access SharedPreferences without StrictMode warnings

withPrefs.kt

private fun <T> withPrefs(context: Context, callback: SharedPreferences.() -> T): T {

    val oldPolicy = StrictMode.allowThreadDiskWrites()

    val output = context.applicationContext
        .getSharedPreferences(BILLING_STORAGE_NAME, Context.MODE_PRIVATE)
        .callback()

    StrictMode.setThreadPolicy(oldPolicy)

    return output
}

// Sample
fun getThatBool(context: Context, key: String): Boolean {
    return withPrefs(context) { getBoolean(key, false) }
}