What is the name of SharedPreferences file name?

Question

I am new to Android and I am kind of stuck for 6 hours straight.

The problem is I don't know the name of the preferences file, and I need to get values from preferences file. I am using Android Studio and created a "Settings Activity". All the way I had not given name to any file except SettingsActivity.java.

So my question is what is the name of the Shared Preferences file (cause the application is keeping the values). Or otherwise if there is a way to find out.

Or perhaps I am missing something obvious in code. Following is my relevant code.

String key = "example_text";
final String PREF_FILE_NAME = "SettingsActivity";
SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_PRIVATE);
String value = preferences.getString(key, " null");                

EDIT 1: I have an activity named RemoteDevice.java, within this activity I have a Async Task subclass for internet usage. Now I have stored IP address through the above mentioned PreferencesActivity and now want to retrieve it. But am unable to find it.

EDIT 2: In the following code I am trying to get value from edit text.

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">

<!-- NOTE: EditTextPreference accepts EditText attributes. -->
<!-- NOTE: EditTextPreference's summary should be set to its value by the activity code. -->
<EditTextPreference
    android:key="example_text"
    android:title="@string/pref_host_ip_address"
    android:defaultValue="@string/pref_default_host_address"
    android:selectAllOnFocus="true"
    android:inputType="numberDecimal"
    android:digits="123456789."
    android:capitalize="words"
    android:singleLine="true"
    android:maxLines="1" />

<!-- NOTE: Hide buttons to simplify the UI. Users can touch outside the dialog to
     dismiss it. -->
<!-- NOTE: ListPreference's summary should be set to its value by the activity code. -->
<ListPreference
    android:key="example_list"
    android:title="@string/pref_title_add_friends_to_messages"
    android:defaultValue="-1"
    android:entries="@array/pref_example_list_titles"
    android:entryValues="@array/pref_example_list_values"
    android:negativeButtonText="@null"
    android:positiveButtonText="@null" />

And I am guessing here android:key is the key to be passed as arguments in

String value = preferences.getString(key, " null");

Answer 1

I am using Android Studio and created a "Settings Activity".

Then you get your SharedPreferences via PreferenceManager.getDefaultSharedPreferences(). Replace:

SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_PRIVATE);

with:

SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);