how to get age and use it in another activity?

Question

I'm developing an android app for babies and after the user sets the birth date of the baby, i need to save it so i can use it in another activity such as sleep and vaccinations. I have used the Shared Preference to save the data enters by the user. but i haven't figure out how to get that data and use it in other classes. can u help me please?

here is the code for the baby data required

public class MainActivity extends Activity {
private Button change;
private ImageView bImage;
private Button mPickDate;
private int mYear;
private int mMonth;
private int mDay;
static final int DATE_DIALOG_ID = 0;
     // get the current date
        final Calendar c = Calendar.getInstance();
        mYear = c.get(Calendar.YEAR);
        mMonth = c.get(Calendar.MONTH);
        mDay = c.get(Calendar.DAY_OF_MONTH);

        updateDateDisplay();


}
   private void updateDateDisplay() {

        this.mPickDate.setText(
        new StringBuilder()
        .append(mMonth + 1).append("-")
        .append(mDay).append("-")
        .append(mYear).append(" "));
        }
   public int getAge (int _year, int _month, int _day) {

       GregorianCalendar cal = new GregorianCalendar();
       int y, m, d, a;         

       y = cal.get(Calendar.YEAR);
       m = cal.get(Calendar.MONTH) + 1;
       d = cal.get(Calendar.DAY_OF_MONTH);
       cal.set(_year, _month, _day);
       a = y - cal.get(Calendar.YEAR);
       if ((m < cal.get(Calendar.MONTH))
                       || ((m == cal.get(Calendar.MONTH)) && (d < cal
                                       .get(Calendar.DAY_OF_MONTH)))) {
               --a;
       }
       if(a < 0)
               throw new IllegalArgumentException("Age < 0");
       return a;
       }



    // the callback received when the user “sets” the date in the dialog
    private DatePickerDialog.OnDateSetListener mDateSetListener =
    new DatePickerDialog.OnDateSetListener() {

    public void onDateSet(DatePicker view, int year,
    int monthOfYear, int dayOfMonth) {
    mYear = year;
    mMonth = monthOfYear;
    mDay = dayOfMonth;
    updateDateDisplay();
    }

    };


    @Override
    protected Dialog onCreateDialog(int id) {
    switch (id) {
    case DATE_DIALOG_ID:
    return new DatePickerDialog(this,
    mDateSetListener,
    mYear, mMonth, mDay);
    }
    return null;
    }

Get the age and then use intent to pass data between activities http://stackoverflow.com/questions/15859445/how-do-you-pass-a-string-from-one-activity-to-another/15859488#15859488 — Raghunandan, May 07 '13 at 19:07
or open the same shared preferences of the application nd read the date saved in it.. — Kamal, May 07 '13 at 19:08
Why not just pass the data to the other Activity via an Intent? Seems like it would be much simpler than using SharedPrefs for one piece of data — Jade Byfield, May 07 '13 at 19:14
possible duplicate of [How do I pass data between activities in Android?](http://stackoverflow.com/questions/2091465/how-do-i-pass-data-between-activities-in-android) — Jean-Bernard Pellerin, May 08 '13 at 02:17

score 0 · Answer 1 · answered May 07 '13 at 19:13

0

Since I don't see in your code where you create the SharedPreference, I will give you the example from the Docs

public class Calc extends Activity {
public static final String PREFS_NAME = "MyPrefsFile";

@Override
protected void onCreate(Bundle state){
   super.onCreate(state);
   . . .

   // Restore preferences
   SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);  // get it here using the name
   boolean silent = settings.getBoolean("silentMode", false);  get a value using the key
   setSilent(silent);
}

You simply use the name of the prefs that you created when you saved it. This example retrieves a boolean but you can easily change that to integer or String or whatever you need

answered May 07 '13 at 19:13

codeMagic

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thank u very much i'll try it.i have made another class which only extends preference activity and i had add to it my xml layout that contains the data feilds and it worked it really saves the data when it's entered. Ok what about if i want to track the age and keep update it to the user what should i add exactly? – user2330447 May 08 '13 at 00:59
ok, now i have made a whole new code that takes the date of birth written as an edit text here is the code of my pref.xml – user2330447 May 08 '13 at 05:00

score 0 · Answer 2 · answered May 07 '13 at 19:16

For accessing Shared Prefs->

For saving String data in prefs ->

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
Editor e = prefs.edit();
e.putString(key, val);   //Key - Name with which you want to save pref, val -  value to save
e.commit();

For getting String data from prefs ->

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
String s = prefs.getString(key, def); // Key - Name of prefs, def - default value if prefs with specified key so not exists

You can save String, Float, Long, Int, Boolean etc in prefs.

how to get age and use it in another activity?

2 Answers2