Storing and updating data

I'd say an Xml file is a bit better than just writing the values to different files..

SqlLite is a lot of overhead for three values.

 

I wouldn't go with the XML file, because you said you need to update the values regularly.

Let me ask you a question: are you going to be storing many sets of these multiple values? Or, do you just plan to update those same 3 values regularly?

If that's the case, I would use SharedPreferences because of the low amount of overhead required, and the ease of use (don't have to deal with files, etc.). Here's a quick example:

Code (Text):

1.  
2. /* A name for your preferences file */
3. public static final String PREFERENCES = "MyPreferences";
4.  
5. /* Keys used for storing/retreiving values */
6. public static final String KEY_AGE = "age";
7. public static final String KEY_SEX = "sex";
8. public static final String KEY_LOCATION = "location";
9.  
10. /* Default values */
11. public static final int DEFAULT_AGE = 21;
12. public static final String DEFAULT_SEX = "Male";
13. public static final String DEFAULT_LOCATION = "Antartica";
14.  
15. protected void onCreate(Bundle state) {
16.    super.onCreate(state);
17.  
18.    ...
19.  
20.    /* Get the information */  
21.    SharedPreferences info = getSharedPreferences(PREFERENCES, 0);
22.    int age = info.getInt(KEY_AGE, DEFAULT_AGE);
23.    String sex = info.getString(KEY_SEX, DEFAULT_SEX);
24.    String location = info.getString(KEY_LOCATION, DEFAULT_LOCATION);
25.  
26.    /* Get new values for the information */
27.    ...
28.  
29.    /* Save some new information */
30.    SharedPreferences.Editor editor = info.edit();
31.    editor.putInt(KEY_AGE, age);
32.    editor.putString(KEY_SEX, sex);
33.    editor.putString(KEY_LOCATION, location);
34.    editor.commit();
35. }
36.