Why do I get empty string when I use getString function?

Question

When I run the app for the first time, the value of dateFormat is empty, I'm very surprised, the dateFormat should return default vale"HH:mm dd-MM-yyyy"

SharedPreferences prefs =PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
String dateFormat=dateFormat("SetDate", "HH:mm dd-MM-yyyy"); 




<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    android:key="AppPreference"
    android:summary="@string/Preferencesummary"
    android:title="@string/Preference" >

     <ListPreference
        android:defaultValue="\n"
        android:dialogTitle="@string/DateFormat"
        android:entries="@array/Mydate"
        android:entryValues="@array/Mydate_values"
        android:key="SetDate"
        android:summary="@string/DateFormatsummary"
        android:title="@string/DateFormat"
        android:layout="@layout/mypreference_layout" 
        />   

</PreferenceScreen>


<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string-array name="Mydate">
        <item>HH:mm dd-MM-yyyy</item>
        <item>HH:mm MM-dd-yyyy</item>
        <item>yyyy-MM-dd HH:mm</item>
    </string-array>
    <string-array name="Mydate_values">
        <item>HH:mm dd-MM-yyyy</item>
        <item>HH:mm MM-dd-yyyy</item>
        <item>yyyy-MM-dd HH:mm</item>
    </string-array>

</resources>

You need to add more context. Maybe you can include you entire Java file (we need to know where you are calling SharedPrefs, etc - do you have context, etc). — Booger
– Booger, Commented Jun 29, 2013 at 13:48

Jon Skeet · Accepted Answer · 2013-06-29 13:49:40Z

4

Well this looks like the problem to me:

android:defaultValue="\n"

Why would you expect a default value of "HH:mm dd-MM-yyyy" when you're explicitly setting it to "\n"? I suggest you change the default value, and see if that works...

(I'm not an Android developer, so maybe I'm missing something... but that seems like the obvious approach to me.)

answered Jun 29, 2013 at 13:49

Jon Skeet

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