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copied!<p>I've resolved my issue by extending the <code>EditTextPrefence</code> class and overriding <code>setText</code> and <code>getText</code></p> <p>this is based on the answer I found <a href="https://stackoverflow.com/questions/5858790/process-the-value-of-preference-before-save-in-android">here</a></p> <pre><code>package com.example.overrides; import android.content.Context; import android.preference.EditTextPreference; import android.util.AttributeSet; public class SanitizedEditTextPreference extends EditTextPreference { public SanitizedEditTextPreference(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public SanitizedEditTextPreference(Context context, AttributeSet attrs) { super(context, attrs); } public SanitizedEditTextPreference(Context context) { super(context); } @Override public String getText() { String value = super.getText(); return StringUtil.sanitize(value); } @Override protected void onSetInitialValue(boolean restoreValue, Object defaultValue) { super.setText(restoreValue ? getPersistedString(null) : (String) defaultValue); } @Override public void setText(String text) { if (StringUtil.isStringBlank(text)) { super.setText(null); return; } super.setText(StringUtil.sanitize(text)); } } </code></pre> <p>I simplified my previous code to:</p> <pre><code>/** * A preference value change listener that updates the preference's summary * to reflect its new value. */ private static Preference.OnPreferenceChangeListener sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() { @Override public boolean onPreferenceChange(Preference preference, Object value) { String stringValue = value.toString(); if (preference instanceof ListPreference) { // For list preferences, look up the correct display value in // the preference's 'entries' list. ListPreference listPreference = (ListPreference) preference; int index = listPreference.findIndexOfValue(stringValue); // Set the summary to reflect the new value. preference.setSummary( index >= 0 ? listPreference.getEntries()[index] : null); } else if (preference.getKey().equals("text_default_album")) { stringValue = StringUtil.sanitize(stringValue); preference.setSummary(stringValue); } else { // For all other preferences, set the summary to the value's // simple string representation. preference.setSummary(stringValue); } return true; } }; </code></pre> <p>and in the <code>pref.xml</code> file it is used like:</p> <pre><code><com.example.overrides.SanitizedEditTextPreference android:key="text_default_album" android:title="@string/pref_title_default_album" android:defaultValue="@string/pref_default_album" android:selectAllOnFocus="true" android:inputType="text" android:capitalize="none" android:singleLine="true" android:maxLines="1" /> </code></pre>

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