I have in preferences.xml following EditTextPreference:

```
  <EditTextPreference
     android:name="@string/pref_test"
     android:defaultValue="0.6"
     android:inputType="numberDecimal"
     android:key="editTestPref"
     android:maxLength="5"
     android:summary=""
     android:title="@string/pref_test" />

```

In one of my activities I read the value. 
But the problem is if the user enters nothing (""), my app crashes. Sure I could do a if statement in the activity to check if its empty string, but I want to do following:

In Preferences.java I get changes of the preferenceEditText. There I want to set a default value if the user enters "":

```
if (preference.getKey().equals("editTestPref")) {

            if(newValue.equals(""))
            {
                final SharedPreferences.Editor prefsEditor = prefs.edit();
                prefsEditor.putString("editTestPref", "1");
                prefsEditor.commit();

                summary = "0.6"; // to update the summary of preference
            }
            else
            {
                summary= (String) newValue;
            }
        }

```

I also tried this code:

```
SharedPreferences customSharedPreference = getSharedPreferences(
         "myCustomSharedPrefs", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = customSharedPreference
                        .edit();
editor.putString("editTestPref", "1");
editor.commit();

```

Both do not work, they do not update the sharedPreference value. It is still "".