CODEWITHSUNDEEP
androidhashmapsharedpreferences
Srikar Reddy
Srikar Reddy

Reputation: 3708

How can I store and retrieve HashMap<String, Boolean> using Shared Preferences

I'm trying to store the Checkbox text and it's state which is a boolean inside a Shared Preference. I'm having the issue - Incompatible types Entry<String, Capture<?>> found Entry<String, java.lang.Boolean> required when retrieving the value (at this line Map.Entry<String, Boolean> entry4)

This is how I'm storing the values inside shared preferences - 

SharedPreferences checkedFilterPref = getContext().getSharedPreferences(
                        Constants.FILTER_CHECKED_PREF, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = checkedFilterPref.edit();
for (Map.Entry<String, Boolean> entry1 : filterPrefHashMap.entrySet()) {
    editor.putBoolean(entry1.getKey(), entry1.getValue());
}
editor.commit();

This is how I'm trying to retrieve the HashMap values -

for (Map.Entry<String, Boolean> entry4 : checkedFilterPref.getAll().entrySet()) {
    filterPrefHashMap.put(entry4.getKey(), entry4.getValue());
}

I'm following the technique shared in this StackOverflow post. I can't seem to get it right. Any help can be appreciated.

Upvotes: 0

Views: 731

Answers (3)

Cătălin Florescu
Cătălin Florescu

Reputation: 5158

You can try doing this: 

File file = new File(getDir("data", MODE_PRIVATE), "map");
ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream(file));
outputStream.writeObject(map);
outputStream.flush();
outputStream.close();

Source

Upvotes: 0

TOP
TOP

Reputation: 2624

You can convert each Entry to string like this:

abc_true, def_false;

Then save them to SharePreference as strings.

When you read data from SharePreference, you have to convert the strings to Entry.

Upvotes: 0

Ashish Rajvanshi
Ashish Rajvanshi

Reputation: 466

You can save primitive data types in Shared Preferences. So the easiest method to save HashMap into Shared Preferences is to convert the HashMap in Json string and then save that string in Shared Preferences.

And while retrieving it back you will have to convert string to HashMap again.

Upvotes: 5

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