How could I retrieve Shared Preferences in another activity?

Question

I would like to retrieve the values saved in the shared preferences in one activity to use these values in another activity. I know that the values saved in the shared preferences are usable in all the activities of the app. Anyone know how I could do? Thanks in advance to everyone! This is the code for saving shared preferences in my MenuActivity:

private final String DefaultEmailValue = ""; private String email; private final String DefaultUsernameValue = ""; private String userName; private static final String PREFS_NAME = "preferences"; private static final String PREF_EMAIL = "Email"; private static final String PREF_USERNAME = "Username"; private void savePreferences() { SharedPreferences settings = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE); SharedPreferences.Editor editor = settings.edit(); // Edit and commit email = mEmail.getText().toString(); userName = mUsername.getText().toString(); System.out.println("onPause save email: " + email); System.out.println("onPause save username: " + userName); editor.putString(PREF_EMAIL, email); editor.putString(PREF_USERNAME, userName); editor.commit(); } private void loadPreferences() { SharedPreferences settings = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE); // Get value email = settings.getString(PREF_EMAIL, DefaultEmailValue); userName = settings.getString(PREF_USERNAME, DefaultUsernameValue); mEmail.setText(email); mUsername.setText(userName); System.out.println("onResume load email: " + email); System.out.println("onResume load username: " + userName); }

Daniel.Wang · Accepted Answer · 2021-01-18 18:27:32Z

2

You already know method. You got field from Preferences in one activity.

You can get field value in another activity with same method as before.

SharedPreferences prefs = this.getSharedPreferences("preferences", Context.MODE_PRIVATE); String email = prefs .getString("Email", "");

answered Jan 18, 2021 at 18:27

Daniel.Wang

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7 Comments

Francesco Bottiglia Over a year ago

So I should make public: static final String PREF_EMAIL = "Email"; so it could be visible in another activity and use it like first argument in getString?

Daniel.Wang Over a year ago

yes, if you don't want make it public, you need to copy define and paste it to another activity.

Francesco Bottiglia Over a year ago

thank you very much mate, and for the second argument in getString() what could I use?

Daniel.Wang Over a year ago

it's default value, if you didn't save email address before, getString() returns default value. So you could use null or empty string or default email address.

Daniel.Wang Over a year ago

yes, SharedPreference saved data to file in internal storage. So you can save your email in SharedPreference.

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fartem · Accepted Answer · 2021-01-18 18:26:10Z

You save your values to SharedPreferences by name. Just retrieve needed value by name on other Activity. SharedPreferences is a storage for your app, not only for Activity. You can retrieve data from any place where you can instantiate SharedPreference instance.

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