Android how to set default value of EditTextPreference from SharedPreference?

Question

This time in the same project I'm facing a slightly challenging issue where in settings.xml file in the res/xml folder:

<EditTextPreference
    android:key="weight" 
    android:title="@string/update_user_weight"
    android:persistent="true"
    android:dialogTitle="@string/update_user_weight"
    android:dialogMessage="@string/update_user_weight_message"
    android:defaultValue="" />

<EditTextPreference
    android:key="age"
    android:title="@string/update_user_age"
    android:persistent="true"
    android:dialogTitle="@string/update_user_age"
    android:dialogMessage="@string/update_user_age_message"
    android:defaultValue="" />

and in a class file UserData.java:

SharedPreferences storeWeightAndAge = getSharedPreferences("WeightAndAgeStorage", Context.MODE_PRIVATE);
Editor store = storeWeightAndAge.edit();
store.putString("weight", weightData);
store.putString("age", ageData);
store.commit();

What I'm trying to do here is to set the above two EditTextPreferences' android:defaultValue to stored weight and age in the SharedPreferences respectively.

Now, how do I go about doing that?

EDIT: provided Settings.java file that uses the settings.xml file:

package com.example.drinkup;

import android.content.SharedPreferences;
import android.os.*;
import android.preference.PreferenceFragment;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;

public class Settings extends PreferenceActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.settings);



    }

}

Answer 1

Firstly, set the default value for EditTextPreference. The value will be stored as a String type. For example:

<EditTextPreference
    android:key="weight"
    android:defaultValue="enter your value (54)"
    ... />

<EditTextPreference
    android:key="age"
    android:defaultValue="enter your value"
    ... />

Then, apply the default value in activity where your app's activity is started first (once installed for first). For example, in the MainActivity's onCreate() method:

PreferenceManager.setDefaultValue(this, R.xml.settings, false);