CODEWITHSUNDEEP
androidupdatesandroid-preferencesmigrate
agrajag
agrajag

Reputation: 461

How to migrate SharedPreferences during update?

I would like to change a SharedPreference from Boolean to String. The default value was true and will be "enabled". This is not a problem because it will be set automatically. But how can I check if it was set to false and then set the new preferece to "disabled"? Is there a method called during update of the app where I could migrate this preference? If I don't migrate it, the state of this preference is lost during update...

Upvotes: 1

Views: 1866

Answers (2)

WonderCsabo
WonderCsabo

Reputation: 12207

SharedPreferences preferences = // obtain it
String pref;
try {
    pref = preferences.getString("yourPref", "enabled");
} catch (ClassCastException e) {
    // this means the pref is stored as a boolean
    boolean boolPref = preferences.getBoolean("yourPref", true);
    // store it instead as a String
    pref = boolPref ? "enabled" : "disabled";
    preferences.edit().remove("yourPref").putString("yourPref", pref).commit();
}

Upvotes: 3

Shivam Verma
Shivam Verma

Reputation: 8023

You could add a simple method in the first activity which'll open, to update the preferences values for you. Also, add a check so that it executes only for the first time.

Upvotes: 1

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