How to use SharedPreferences() to store value and get stored value to another activity

Question

I'am trying to store a value of edit text using shared preferences but I don't know how to get stored value of SharedPreferences() in another activity.

Answer 1

If you are working in an App that may get complex further down the way, it is better to centralize your shared preferences. So I suggest to make a class for shared preferences like this:

Java Class

//SharedPreferences manager class
public class SharedPrefs {

//SharedPreferences file name
private static String SHARED_PREFS_FILE_NAME = "my_app_shared_prefs";

//here you can centralize all your shared prefs keys
public static String KEY_MY_SHARED_BOOLEAN = "my_shared_boolean";
public static String KEY_MY_SHARED_FOO = "my_shared_foo";

//get the SharedPreferences object instance
//create SharedPreferences file if not present


private static SharedPreferences getPrefs(Context context) {
    return context.getSharedPreferences(SHARED_PREFS_FILE_NAME, Context.MODE_PRIVATE);
}

//Save Booleans
public static void putBoolean(Context context, String key, boolean value) {
    getPrefs(context).edit().putBoolean(key, value).commit();       
}

//Get Booleans
public static boolean getBoolean(Context context, String key) {
    return getPrefs(context).getBoolean(key, false);
}

//Get Booleans if not found return a predefined default value
public static boolean getBoolean(Context context, String key, boolean defaultValue) {
    return getPrefs(context).getBoolean(key, defaultValue);
}

//Strings
public static void putString(Context context, String key, String value) {
    getPrefs(context).edit().putString(key, value).commit();
}

public static String getString(Context context, String key) {
    return getPrefs(context).getString(key, "");
}

public static String getString(Context context, String key, String defaultValue) {
    return getPrefs(context).getString(key, defaultValue);
}

//Integers
public static void putString(Context context, String key, int value) {
    getPrefs(context).edit().putInt(key, value).commit();
}

public static int getInt(Context context, String key) {
    return getPrefs(context).getInt(key, 0);
}

public static int getInt(Context context, String key, int defaultValue) {
    return getPrefs(context).getInt(key, defaultValue);
}

//Floats
public static void putFloat(Context context, String key, float value) {
    getPrefs(context).edit().putFloat(key, value).commit();
}

public static float getFloat(Context context, String key) {
    return getPrefs(context).getFloat(key, 0);

In your activity you may save SharedPreferences this way

Save a variable

//saving a boolean into prefs
SharedPrefs.putBoolean(this, SharedPrefs.KEY_MY_SHARED_BOOLEAN, booleanVar);

and you may retrieve your SharedPreferences this way

Retrieve a saved value

//getting a boolean from prefs
booleanVar = SharedPrefs.getBoolean(this,SharedPrefs.KEY_MY_SHARED_BOOLEAN);

This way you won't have scattered shared preference code, sometimes with different structure all over the App.

Answer 2

// store the value in preference store

    SharedPreferences sharedpreferences = getSharedPreferences(MyPREFERENCES, Context.MODE_PRIVATE);
    Editor editor = sharedpreferences.edit();
    editor.putString("key", "value");
    editor.commit();

// get the value from preference store

    String name = sharedpreferences .getString("key", "");

Answer 3

here is my try, create class of SF

public class SFData {

public static SharedPreferences sf_login;
static SharedPreferences.Editor sf_login_edit;

public static void loginSF(Context ctx){
    sf_login = ctx.getSharedPreferences("login", 0);
    sf_login_edit = sf_login.edit();
}

public static void loginSFStore(Map<String, Object> mapData){
    loginSFClear();
    for (Map.Entry<String, Object> entry : mapData.entrySet()) {
        String keyName = entry.getKey();
        Object value = entry.getValue();
        if (value instanceof String) {
            sf_login_edit.putString(keyName, (String) value);
        }
        else if (value instanceof Boolean) {
            sf_login_edit.putBoolean(keyName, (boolean) value);
        }
        else if (value instanceof Integer) {
            sf_login_edit.putInt(keyName, (int) value);
        }
    }
    sf_login_edit.putBoolean("isLogin", true);
    sf_login_edit.commit();
}

public static void loginSFClear(){
    sf_login_edit.clear();
    sf_login_edit.commit();
}

}

sample of use Boolean login = SFData.sf_login.getBoolean("isLogin", false); please adapt to your code

Answer 4

First intialize SharedPreferences with a Context:

final SharedPreferences preferences = PreferenceManager
                .getDefaultSharedPreferences(ApplicationLoader.applicationContext);

To save you could use this:

SharedPreferences.Editor editor = preferences.edit();
editor.putString("editText", yourEditText.getText().toString());
editor.commit();

Then to get the value inside another class, you could use:

String editText = preferences.getString("editText", "");

The second value "" represents a default value, if editText is not saved earlier, an empty String will be returned.