How do I retrieve the preferences from my settings activity in Kotlin?

user_13063065 0
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I am currently struggling with Kotlin for my Bachelor thesis and I have no idea what I am doing.

So here is my problem:

I created a (functional) settings activity with multiple EditTextPreferences and a ListPreference. Right now I want to retrieve the selected item from the ListPreference in another activity. This is my ListPreference:

    <ListPreference
        android:dialogTitle="Art des Implantates"
        android:entries="@array/settings_list_preference_titles"
        android:entryValues="@array/settings_list_preference_values"
        android:key="list"
        android:title="Implantat"
        app:useSimpleSummaryProvider="true"/>

So how do I retrieve the selected Item? Let's say I just want to display it somewhere else. I have no clue whatsoever, since every single Tutorial I came across is for java and I don't speak java.

Please help me. I'm desperate.

kotlin preferences settings android
2 Answers

Step #1: Get a SharedPreferences object for the default preferences:

val prefs = PreferenceManager.getDefaultSharedPreferences(context)

(where context is a Context, such as an Activity or the Application singleton)

Step #2: Call getString("list", someDefaultValue) on the SharedPreferences, where "list" is your key (from your <ListPreference>) and someDefaultValue is a String that you want returned if the user has not yet set this preference

since every single Tutorial I came across is for java

This sample app (from this book) is in Kotlin and shows the use of SharedPreferences. The documentation also shows the use of SharedPreferences with Kotlin (and Java).

user_1151450

If you are using java:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());

You can access values by using XML app:key="this_value" like this:

prefs.getString("this_value","some_val");
user_120131850
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