How do I display the current value of an Android Preference in the Preference summary

Question

This must come up very often   When the user is editing preferences in an Android app  I d like them to be able to see the currently set value of the preference in the Preference summary   Example  if I have a Preference setting for  Discard old messages  that specifies the number of days after which messages need to be cleaned up  In the PreferenceActivity I d like the user to see    Discard old messages   lt - title   Clean up messages after x days   lt - summary where x is the current Preference value   Extra credit  make this reusable  so I can easily apply it to all my preferences regardless of their type  so that it work with EditTextPreference  ListPreference etc  with minimal amount of coding

User · Answer

public class ProfileManagement extends PreferenceActivity implements OnPreferenceChangeListener       EditTextPreference screenName      ListPreference sex        Override     protected void onCreate Bundle savedInstanceState                super onCreate savedInstanceState               addPreferencesFromResource R layout profile management                screenName    EditTextPreference  findPreference  editTextPref                sex    ListPreference  findPreference  sexSelector                 screenName setOnPreferenceChangeListener this               sex setOnPreferenceChangeListener this                   Override     public boolean onPreferenceChange Preference preference  Object newValue            preference setSummary newValue toString             return true

User · Answer

Because I m using a custom PreferenceDataStore  I can t add a listener to some SharedPreference so I ve had to write a somewhat hacky solution that listens to each preference   class SettingsFragment   PreferenceFragmentCompat    Preference OnPreferenceChangeListener       private val handler  Handler by lazy   Handler Looper getMainLooper           override fun onCreatePreferences savedInstanceState  Bundle   rootKey  String             preferenceManager preferenceDataStore   prefs         addPreferencesFromResource R xml app preferences          onPreferenceChange preferenceScreen  null             override fun onPreferenceChange preference  Preference  newValue  Any    Boolean           preference onPreferenceChangeListener   this          when  preference                is PreferenceGroup - gt  for  i in 0 until preference preferenceCount                    onPreferenceChange preference getPreference i   null                            is ListPreference - gt                    if  preference value    null                        preference isPersistent   false                     preference value   Preference  class java getDeclaredField  mDefaultValue                                apply   isAccessible   true                                get preference  toString                       preference isPersistent   true                                    postPreferenceUpdate Runnable   preference summary   preference entry                                    return true                       We can t directly update the preference summary update because  onPreferenceChange  s result        is used to decide whether or not to update the pref value              private fun postPreferenceUpdate r  Runnable    handler post r

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The concise solution by 1 line of code    Override public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       addPreferencesFromResource R xml preferences        bindPreferenceSummaryToValue findPreference  mySetting             initialize summary     sBindPreferenceSummaryToValueListener onPreferenceChange findPreference  mySetting               ListPreference  findPreference  mySetting    getEntry

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If you use PreferenceFragment  this is how I solved it  It s self explanatory   public static class SettingsFragment extends PreferenceFragment implements OnSharedPreferenceChangeListener        Override     public void onCreate Bundle savedInstanceState          super onCreate savedInstanceState         addPreferencesFromResource R xml settings         getPreferenceScreen   getSharedPreferences   registerOnSharedPreferenceChangeListener this               Override     public void onResume           super onResume          for  int i   0  i  lt  getPreferenceScreen   getPreferenceCount      i            Preference preference   getPreferenceScreen   getPreference i           if  preference instanceof PreferenceGroup              PreferenceGroup preferenceGroup    PreferenceGroup  preference            for  int j   0  j  lt  preferenceGroup getPreferenceCount      j                Preference singlePref   preferenceGroup getPreference j               updatePreference singlePref  singlePref getKey                           else             updatePreference preference  preference getKey                                   Override     public void onSharedPreferenceChanged SharedPreferences sharedPreferences  String key          updatePreference findPreference key   key              private void updatePreference Preference preference  String key          if  preference    null  return        if  preference instanceof ListPreference            ListPreference listPreference    ListPreference  preference          listPreference setSummary listPreference getEntry             return                SharedPreferences sharedPrefs   getPreferenceManager   getSharedPreferences          preference setSummary sharedPrefs getString key   Default

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For EditTextPreference   public class MyEditTextPreference extends EditTextPreference       public MyEditTextPreference Context context  AttributeSet attrs  int defStyle            super context  attrs  defStyle              public MyEditTextPreference Context context  AttributeSet attrs            super context  attrs               Override     public void setText String text            super setText text           setSummary text

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If someone is still looking for answers to this  you should check out thirtythreefortys answer    lt ListPreference     android key  pref list      android title  A list of preferences      android summary   s      android entries   array pref list entries      android entryValues   array pref list entries values      android defaultValue  0    gt       Android will replace  s with the current string value of the preference  as displayed by the ListPreference s picker

User · Answer

If you are using AndroidX you can use a custom SummaryProvider  This approach can be used for any Preference   Example from documentation  Java    EditTextPreference countingPreference    EditTextPreference  findPreference  counting     countingPreference setSummaryProvider new SummaryProvider lt EditTextPreference gt           Override     public CharSequence provideSummary EditTextPreference preference            String text   preference getText            if  TextUtils isEmpty text                return  Not set                     return  Length of saved value      text length                Example from documentation  Kotlin    val countingPreference   findPreference  counting   as EditTextPreference  countingPreference summaryProvider   SummaryProvider lt EditTextPreference gt    preference - gt      val text   preference text     if  TextUtils isEmpty text              Not set        else            Length of saved value      text length

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Here s my solution  Build a preference type  getter  method  protected String getPreference Preference x           http   stackoverflow com questions 3993982 how-to-check-type-of-variable-in-java     if  x instanceof CheckBoxPreference          return  quot CheckBoxPreference quot       else if  x instanceof EditTextPreference          return  quot EditTextPreference quot       else if  x instanceof ListPreference          return  quot ListPreference quot       else if  x instanceof MultiSelectListPreference          return  quot MultiSelectListPreference quot       else if  x instanceof RingtonePreference          return  quot RingtonePreference quot       else if  x instanceof SwitchPreference          return  quot SwitchPreference quot       else if  x instanceof TwoStatePreference          return  quot TwoStatePreference quot       else if  x instanceof DialogPreference     Needs to be after ListPreference         return  quot DialogPreference quot       else         return  quot undefined quot      Build a  setSummaryInit  method  public void onSharedPreferenceChanged SharedPreferences prefs  String key            Log i TAG   quot   onSharedPreferenceChanged prefs  quot    prefs    quot   key  quot    key    quot   quot            if  key    null                 updatePreference prefs  key               setSummary key             else               Log e TAG   quot Preference without key  quot                      Log i TAG   quot - onSharedPreferenceChanged   quot               protected boolean setSummary             return  setSummary null                  protected boolean setSummary String sKey            return  setSummary sKey                  private boolean  setSummary String sKey            if  sKey    null  Log i TAG   quot Initializing quot            else Log i TAG  sKey                       Get Preferences         SharedPreferences sharedPrefs   PreferenceManager                  getDefaultSharedPreferences this               Iterate through all Shared Preferences            http   stackoverflow com questions 9310479 how-to-iterate-through-all-keys-of-shared-preferences         Map lt String    gt  keys   sharedPrefs getAll            for  Map Entry lt String    gt  entry   keys entrySet                  String key   entry getKey                   Do work only if initializing  null  or updating specific preference key             if    sKey    null      sKey equals key                       String value   entry getValue   toString                    Preference pref   findPreference key                   String preference   getPreference pref                   Log d  quot map values quot   key    quot     quot    value    quot     quot    preference                   pref setSummary key    quot     quot    value    quot     quot    preference                   if  sKey    null  return true                                  return false             private void updatePreference SharedPreferences prefs  String key            Log i TAG   quot   updatePreference prefs  quot    prefs    quot   key  quot    key    quot   quot            Preference pref   findPreference key           String preferenceType   getPreference pref           Log i TAG   quot preferenceType    quot    preferenceType           Log i TAG   quot - updatePreference   quot           Initialize Create public class that PreferenceActivity and implements OnSharedPreferenceChangeListener protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       PreferenceManager setDefaultValues this  R xml global preferences      false       this addPreferencesFromResource R xml global preferences       this getPreferenceScreen   getSharedPreferences            registerOnSharedPreferenceChangeListener this      protected void onResume         super onResume        setSummary

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Here is a working solution for all EditTextPreferences inside of a PreferenceFragment based on  tdeveaux answer   public class SettingsFragment extends PreferenceFragment implements SharedPreferences OnSharedPreferenceChangeListener       private static final String TAG    SettingsFragment         Override     public void onCreate  Bundle savedInstanceState            super onCreate savedInstanceState           addPreferencesFromResource R xml preferences           getPreferenceScreen   getSharedPreferences   registerOnSharedPreferenceChangeListener this               Override     public void onResume              super onResume             for  int i   0  i  lt  getPreferenceScreen   getPreferenceCount      i                Preference preference   getPreferenceScreen   getPreference i               updatePreference preference                         Override     public void onSharedPreferenceChanged  SharedPreferences sharedPreferences  String key            updatePreference findPreference key               private void updatePreference  Preference preference            if  preference instanceof EditTextPreference                EditTextPreference editTextPreference    EditTextPreference preference              editTextPreference setSummary editTextPreference getText

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My option is to extend ListPreference and it s clean   public class ListPreferenceShowSummary extends ListPreference        private final static String TAG   ListPreferenceShowSummary class getName         public ListPreferenceShowSummary Context context  AttributeSet attrs            super context  attrs           init               public ListPreferenceShowSummary Context context            super context           init               private void init              setOnPreferenceChangeListener new OnPreferenceChangeListener                   Override             public boolean onPreferenceChange Preference arg0  Object arg1                    arg0 setSummary getEntry                     return true                                        Override     public CharSequence getSummary             return super getEntry              Then you add in your settings xml    lt yourpackage ListPreferenceShowSummary     android key  key  android title  title      android entries   array entries  android entryValues   array values      android defaultValue  first value   gt

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You can override default Preference classes and implement the feature   public class MyListPreference extends ListPreference        public MyListPreference Context context    super context         public MyListPreference Context context  AttributeSet attrs    super context  attrs          Override     public void setValue String value            super setValue value           setSummary getEntry               Later in you xml you can use custom preference like    lt your package name MyListPreference      android key  noteInterval      android defaultValue  60      android title  Notification Interval      android entries   array noteInterval      android entryValues   array noteIntervalValues        gt

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I ve seen all voted answers show how to set the summary with the exact current value  but the OP wanted also something like    quot Clean up messages after x days quot    lt - summary where x is the current Preference value  Here is my answer for achieving that As per the documentation on ListPreference getSummary     Returns the summary of this ListPreference  If the summary has a String formatting marker in it  i e   quot  s quot  or  quot  1 s quot    then the current entry value will be substituted in its place   However  I tried this on several devices and it doesn t seem to work  With some research  I found a good solution in this answer  It simply consists of extending every Preference you use and override getSummary   to work as specified by Android documentation

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Android documentation says one can use a String formatting marker in getSummary        If the summary has a String formatting marker in it  i e    s  or   1 s    then the current entry value will be substituted in its place    Simply specifying android summary  Clean up messages after  s days  in ListPreference xml declaration worked for me   Note  This only works for ListPreference

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To set the summary of a ListPreference to the value selected in a dialog you could use this code   package yourpackage   import android content Context  import android util AttributeSet   public class ListPreference extends android preference ListPreference        public ListPreference Context context  AttributeSet attrs            super context  attrs              protected void onDialogClosed boolean positiveResult            super onDialogClosed positiveResult           if  positiveResult  setSummary getEntry                protected void onSetInitialValue boolean restoreValue  Object defaultValue            super onSetInitialValue restoreValue  defaultValue           setSummary getEntry               and reference the yourpackage ListPreference object in your preferences xml remembering to specify there your android defaultValue as this triggers the call to onSetInitialValue     If you want you can then modify the text before calling setSummary   to whatever suits your application

User · Answer

Since in androidx Preference class has the SummaryProvider interface  it can be done without OnSharedPreferenceChangeListener  Simple implementations are provided for EditTextPreference and ListPreference  Building on EddieB s answer it can look like this  Tested on androidx preference preference 1 1 0-alpha03   package com example util timereminder ui prefs   import android os Bundle   import com example util timereminder R   import androidx preference EditTextPreference  import androidx preference ListPreference  import androidx preference Preference  import androidx preference PreferenceFragmentCompat  import androidx preference PreferenceGroup          Displays different preferences      public class PrefsFragmentExample extends PreferenceFragmentCompat         Override     public void onCreatePreferences Bundle savedInstanceState  String rootKey            addPreferencesFromResource R xml preferences            initSummary getPreferenceScreen                           Walks through all preferences                 param p The starting preference to search from              private void initSummary Preference p            if  p instanceof PreferenceGroup                PreferenceGroup pGrp    PreferenceGroup  p              for  int i   0  i  lt  pGrp getPreferenceCount    i                      initSummary pGrp getPreference i                            else               setPreferenceSummary p                                   Sets up summary providers for the preferences                 param p The preference to set up summary provider              private void setPreferenceSummary Preference p               No need to set up preference summaries for checkbox preferences because            they can be set up in xml using summaryOff and summary On         if  p instanceof ListPreference                p setSummaryProvider ListPreference SimpleSummaryProvider getInstance               else if  p instanceof EditTextPreference                p setSummaryProvider EditTextPreference SimpleSummaryProvider getInstance

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Thanks  Reto  for the detailed explanation   In case this is of any help to anyone  I had to change the code proposed by Reto Meier to make it work with the SDK for Android 1 5   Override protected void onResume         super onResume            Setup the initial values     mListPreference setSummary  Current value is     mListPreference getEntry   toString              Set up a listener whenever a key changes                         The same change applies for the callback function onSharedPreferenceChanged SharedPreferences sharedPreferences  String key    Cheers   Chris

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You have to use bindPreferenceSummaryToValue function on the onCreate method   Example        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState              Add  general  preferences  defined in the XML file         addPreferencesFromResource R xml pref general               For all preferences  attach an OnPreferenceChangeListener so the UI summary can be            updated when the preference changes          bindPreferenceSummaryToValue findPreference getString R string pref location key             bindPreferenceSummaryToValue findPreference getString R string pref units key             See lesson 3 on Udacity Android Course  https   www udacity com course viewer   c-ud853 l-1474559101 e-1643578599 m-1643578601

User · Answer

According to Android docs you can use app useSimpleSummaryProvider  true  in ListPreference and EditTextPreference components

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I found this way to make EditTextPreference from support library handle   s  in summary  as ListPreference already handles    public class EditTextPreference extends android support v7 preference EditTextPreference       public EditTextPreference Context context  AttributeSet attrs            super context  attrs               Override     public void setText String text            super setText text           notifyChanged                Override     public CharSequence getSummary             String text   super getText            String summary   super getSummary   toString            return String format summary  text    null        text             In xml it will look like this    lt com example yourapp EditTextPreference     android defaultValue  1      android key  cleanup period      android summary  Clean up messages after  s days      android title  Clean up period    gt

User · Answer

If you only want to display the plain text value of each field as its summary  the following code should be the easiest to maintain  It requires only two changes  lines 13 and 21  marked with  change here     package com my package   import android content SharedPreferences  import android content SharedPreferences OnSharedPreferenceChangeListener  import android os Bundle  import android preference EditTextPreference  import android preference ListPreference  import android preference Preference  import android preference PreferenceActivity   public class PreferencesActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener        private final String   mAutoSummaryFields      pref key1    pref key2    pref key3        change here     private final int mEntryCount   mAutoSummaryFields length      private Preference   mPreferenceEntries        SuppressWarnings  deprecation        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           addPreferencesFromResource R xml preferences file      change here         mPreferenceEntries   new Preference mEntryCount           for  int i   0  i  lt  mEntryCount  i                  mPreferenceEntries i    getPreferenceScreen   findPreference mAutoSummaryFields i                          SuppressWarnings  deprecation        Override     protected void onResume             super onResume            for  int i   0  i  lt  mEntryCount  i                  updateSummary mAutoSummaryFields i       initialization                   getPreferenceScreen   getSharedPreferences   registerOnSharedPreferenceChangeListener this      register change listener             SuppressWarnings  deprecation        Override     protected void onPause             super onPause            getPreferenceScreen   getSharedPreferences   unregisterOnSharedPreferenceChangeListener this      unregister change listener            private void updateSummary String key            for  int i   0  i  lt  mEntryCount  i                  if  key equals mAutoSummaryFields i                      if  mPreferenceEntries i  instanceof EditTextPreference                        final EditTextPreference currentPreference    EditTextPreference  mPreferenceEntries i                       mPreferenceEntries i  setSummary currentPreference getText                                       else if  mPreferenceEntries i  instanceof ListPreference                        final ListPreference currentPreference    ListPreference  mPreferenceEntries i                       mPreferenceEntries i  setSummary currentPreference getEntry                                       break                                     public void onSharedPreferenceChanged SharedPreferences sharedPreferences  String key            updateSummary key

User · Answer

My solution is to create a custom EditTextPreference  used in XML like this   lt com example EditTextPreference android title  Example Title    gt   EditTextPreference java -  package com example   import android content Context  import android util AttributeSet   public class EditTextPreference extends android preference EditTextPreference       public EditTextPreference Context context  AttributeSet attrs  int defStyle                super context  attrs  defStyle              public EditTextPreference Context context  AttributeSet attrs                super context  attrs              public EditTextPreference Context context                super context  null               Override     protected void onDialogClosed boolean positiveResult                super onDialogClosed positiveResult            setSummary getSummary                 Override     public CharSequence getSummary                 return getText

User · Answer

There are ways to make this a more generic solution  if that suits your needs   For example  if you want to generically have all list preferences show their choice as summary  you could have this for your onSharedPreferenceChanged implementation   public void onSharedPreferenceChanged SharedPreferences sharedPreferences  String key        Preference pref   findPreference key        if  pref instanceof ListPreference            ListPreference listPref    ListPreference  pref          pref setSummary listPref getEntry               This is easily extensible to other preference classes   And by using the getPreferenceCount and getPreference functionality in PreferenceScreen and PreferenceCategory  you could easily write a generic function to walk the preference tree setting the summaries of all preferences of the types you desire to their toString representation

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Actually  CheckBoxPreference does have the ability to specify a different summary based on the checkbox value  See the android summaryOff and android summaryOn attributes  as well as the corresponding CheckBoxPreference methods

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After several hours I ve been spent to solve such problem I ve implemented this code    UPDATE  the final version listing    public class MyPreferencesActivity extends PreferenceActivity               ListPreference m updateList               Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           addPreferencesFromResource R xml preferences            m updateList    ListPreference  findPreference getString R string pref update interval key            String currentValue   m updateList getValue            if  currentValue    null                m updateList setValue  String m updateList getEntryValues   DEFAULT UPDATE TIME INDEX                currentValue   m updateList getValue                      updateListSummary currentValue                m updateList setOnPreferenceChangeListener new OnPreferenceChangeListener                  Override             public boolean onPreferenceChange Preference preference  Object newValue                    updateListSummary newValue toString                     return true                                                   private void updateListSummary String newValue            int index   m updateList findIndexOfValue newValue           CharSequence entry   m updateList getEntries   index           m updateList setSummary entry             That was the only solution that worked for me fine  Before I ve tried to subclass from ListPreferences and to implement android summary  bla bla bla  s   Neither worked

User · Answer

Maybe like ListPreference  Modify getSummary to get what you want   package your package preference   import android content Context  import android util AttributeSet   public class EditTextPreference extends android preference EditTextPreference          public EditTextPreference Context context  AttributeSet attrs  int defStyle                super context  attrs  defStyle                      public EditTextPreference Context context  AttributeSet attrs                super context  attrs                      public EditTextPreference Context context                super context                       Override         public CharSequence getSummary                 if super getSummary      null  return null               String summary   super getSummary   toString                return String format summary  getText                       And use this in your xml    lt your package EditTextPreference                 android key  pref alpha                  android summary  Actual value   s                  android title  Title                  android defaultValue  default                    gt    So you are able to write a summary with  s instead of the actual value

User · Answer

This is the code you need to set the summary to the chosen value  It also sets the values on startup and respects the default values  not only on change  Just change  R layout prefs  to your xml-file and extend the setSummary-method to your needs  It actually is only handling ListPreferences  but it is easy to customize to respect other Preferences   package de koem timetunnel   import android content SharedPreferences  import android content SharedPreferences OnSharedPreferenceChangeListener  import android os Bundle  import android preference ListPreference  import android preference Preference  import android preference PreferenceActivity  import android preference PreferenceGroup   public class Prefs      extends PreferenceActivity      implements OnSharedPreferenceChangeListener        Override    protected void onCreate Bundle savedInstanceState           super onCreate savedInstanceState           this addPreferencesFromResource R layout prefs          this initSummaries this getPreferenceScreen             this getPreferenceScreen   getSharedPreferences               registerOnSharedPreferenceChangeListener this                      Set the summaries of all preferences          private void initSummaries PreferenceGroup pg          for  int i   0  i  lt  pg getPreferenceCount      i              Preference p   pg getPreference i             if  p instanceof PreferenceGroup                this initSummaries  PreferenceGroup  p      recursion           else               this setSummary p                            Set the summaries of the given preference          private void setSummary Preference pref             react on type or key       if  pref instanceof ListPreference              ListPreference listPref    ListPreference  pref            pref setSummary listPref getEntry                              used to change the summary of a preference          public void onSharedPreferenceChanged SharedPreferences sp  String key         Preference pref   findPreference key        this setSummary pref             private static final String LOGTAG    Prefs       koem

User · Answer

In Android Studio  open  root preferences xml   select Design mode  Select the desired EditTextPreference preference  and under  All attributes   look for the  useSimpleSummaryProvider  attribute and set it to true  It will then show the current value

User · Answer

FYI   findPreference CharSequence key  This method was deprecated in API level 11  This function is not relevant for a modern fragment-based PreferenceActivity    All the more reason to look at the very slick Answer of  ASD above  source found here  saying to use  s in android summary for each field in preferences xml   Current value of preference is substituted for  s       lt ListPreference               android summary  Length of longest word to return as match is  s          gt

User · Answer

Thanks for this tip   I have one preference screen and want to show the value for each list preference as the summary   This is my way now   public class Preferences extends PreferenceActivity implements OnSharedPreferenceChangeListener     Override protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           addPreferencesFromResource R xml preferences       Override protected void onResume         super onResume            Set up initial values for all list preferences     Map lt String    gt  sharedPreferencesMap   getPreferenceScreen   getSharedPreferences   getAll        Preference pref      ListPreference listPref      for  Map Entry lt String    gt  entry   sharedPreferencesMap entrySet              pref   findPreference entry getKey             if  pref instanceof ListPreference                listPref    ListPreference  pref              pref setSummary listPref getEntry                             Set up a listener whenever a key changes                 getPreferenceScreen   getSharedPreferences   registerOnSharedPreferenceChangeListener this       Override protected void onPause         super onPause            Unregister the listener whenever a key changes                 getPreferenceScreen   getSharedPreferences   unregisterOnSharedPreferenceChangeListener this          public void onSharedPreferenceChanged SharedPreferences sharedPreferences  String key        Preference pref   findPreference key        if  pref instanceof ListPreference            ListPreference listPref    ListPreference  pref          pref setSummary listPref getEntry               This works for me  but I m wondering what is the best solution  performance  stability  scalibility   the one Koem is showing or this one

User · Answer

Simply   listPreference setSummary   s

User · Answer

I solved the issue with the following descendant of ListPreference    public class EnumPreference extends ListPreference        public EnumPreference Context aContext  AttributeSet attrs            super aContext attrs               Override     protected View onCreateView ViewGroup parent            setSummary getEntry             return super onCreateView parent               Override     protected boolean persistString String aNewValue            if  super persistString aNewValue                 setSummary getEntry                 notifyChanged                return true            else               return false                      Seems to work fine for me in 1 6 up through 4 0 4

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For EditTextPreference   I came to this solution  of course  just if you need particular edittextpreference but you could do this with every Preference                 private static final String KEY EDIT TEXT PREFERENCE2    on a1   public static  String value                       private void updatePreference Preference preference  String key                 if  key equals KEY EDIT TEXT PREFERENCE2                     preference   findPreference key                   if  preference instanceof EditTextPreference                        editTextPreference    EditTextPreference  preference                      editTextPreference setSummary editTextPreference getText                         value   editTextPreference getText   toString                        return                                    SharedPreferences sharedPrefs   getPreferenceManager   getSharedPreferences                    preference setSummary sharedPrefs getString KEY EDIT TEXT PREFERENCE2                           Then in onResume      Override         public void onResume                 super onResume                 SharedPreferences etext   getPreferenceManager   getSharedPreferences                String str   etext getString  value                    editTextPreference    EditTextPreference  findPreference KEY EDIT TEXT PREFERENCE2               editTextPreference setText str               editTextPreference setSummary editTextPreference getText                  getPreferenceScreen   getSharedPreferences                        registerOnSharedPreferenceChangeListener this               In    Override         public void onSharedPreferenceChanged SharedPreferences sharedPreferences  String key                updatePreference findPreference key   key

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Here all these are cut from Eclipse sample SettingsActivity  I have to copy all these too much codes to show how these android developers choose perfectly for more generalized and stable coding style  I left the codes for adapting the PreferenceActivity to tablet and greater API   public class SettingsActivity extends PreferenceActivity     Override protected void onPostCreate Bundle savedInstanceState        super onPostCreate savedInstanceState        setupSummaryUpdatablePreferencesScreen       private void setupSummaryUpdatablePreferencesScreen             In the simplified UI  fragments are not used at all and we instead        use the older PreferenceActivity APIs          Add  general  preferences      addPreferencesFromResource R xml pref general           Bind the summaries of EditText List Dialog preferences to        their values  When their values change  their summaries are updated        to reflect the new value  per the Android Design guidelines      bindPreferenceSummaryToValue findPreference  example text         bindPreferenceSummaryToValue findPreference  example list               A preference value change listener that updates the preference s summary    to reflect its new value      private static Preference OnPreferenceChangeListener sBindPreferenceSummaryToValueListener   new Preference OnPreferenceChangeListener          private String TAG   SettingsActivity class getSimpleName          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  gt   0                   listPreference getEntries   index                    null             else                  For all other preferences  set the summary to the value s                simple string representation              preference setSummary stringValue                     Log i TAG   pref changed       preference getKey           value           return true                   Binds a preference s summary to its value  More specifically  when the    preference s value is changed  its summary  line of text below the    preference title  is updated to reflect the value  The summary is also    immediately updated upon calling this method  The exact display format is    dependent on the type of preference         see  sBindPreferenceSummaryToValueListener      private static void bindPreferenceSummaryToValue Preference preference           Set the listener to watch for value changes      preference setOnPreferenceChangeListener sBindPreferenceSummaryToValueListener           Trigger the listener immediately with the preference s        current value      sBindPreferenceSummaryToValueListener onPreferenceChange preference                                                               PreferenceManager                                                               getDefaultSharedPreferences preference getContext                                                                  getString preference getKey                 xml pref general xml   lt PreferenceScreen xmlns android  http   schemas android com apk res android   gt    lt  -- NOTE  EditTextPreference accepts EditText attributes  -- gt   lt  -- NOTE  EditTextPreference s summary should be set to its value by the activity code  -- gt   lt EditTextPreference android capitalize  words  android defaultValue   string pref default display name  android inputType  textCapWords  android key  example text  android maxLines  1  android selectAllOnFocus  true  android singleLine  true  android title   string pref title display name    gt    lt  -- NOTE  Hide buttons to simplify the UI  Users can touch outside the dialog todismiss it -- gt   lt  -- NOTE  ListPreference s summary should be set to its value by the activity code  -- gt   lt ListPreference android defaultValue  -1  android entries   array pref example list titles  android entryValues   array pref example list values  android key  example list  android negativeButtonText   null  android positiveButtonText   null  android title   string pref title add friends to messages    gt    lt  PreferenceScreen gt    values strings activity settings xml   lt resources gt   lt  -- Strings related to Settings -- gt    lt  -- Example General settings -- gt    lt string name  pref title display name  gt Display name lt  string gt   lt string name  pref default display name  gt John Smith lt  string gt    lt string name  pref title add friends to messages  gt Add friends to messages lt  string gt   lt string-array name  pref example list titles  gt   lt item gt Always lt  item gt   lt item gt When possible lt  item gt   lt item gt Never lt  item gt   lt  string-array gt   lt string-array name  pref example list values  gt   lt item gt 1 lt  item gt   lt item gt 0 lt  item gt   lt item gt -1 lt  item gt   lt  string-array gt   lt  resources gt    NOTE  Actually I just want to comment like  Google s sample for PreferenceActivity is also interesting   But I haven t enough reputation points So please don t blame me   Sorry for bad English

User · Answer

Here is my solution    FWIW  package com example PrefTest   import android content SharedPreferences  import android content SharedPreferences OnSharedPreferenceChangeListener  import android os Bundle  import android preference EditTextPreference  import android preference ListPreference  import android preference Preference  import android preference PreferenceActivity  import android preference PreferenceGroup  import android preference PreferenceManager   public class Preferences extends PreferenceActivity implements         OnSharedPreferenceChangeListener         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           addPreferencesFromResource R xml preferences           PreferenceManager setDefaultValues Preferences this  R xml preferences              false           initSummary getPreferenceScreen                 Override     protected void onResume             super onResume               Set up a listener whenever a key changes         getPreferenceScreen   getSharedPreferences                    registerOnSharedPreferenceChangeListener this               Override     protected void onPause             super onPause               Unregister the listener whenever a key changes         getPreferenceScreen   getSharedPreferences                    unregisterOnSharedPreferenceChangeListener this              public void onSharedPreferenceChanged SharedPreferences sharedPreferences              String key            updatePrefSummary findPreference key               private void initSummary Preference p            if  p instanceof PreferenceGroup                PreferenceGroup pGrp    PreferenceGroup  p              for  int i   0  i  lt  pGrp getPreferenceCount    i                      initSummary pGrp getPreference i                            else               updatePrefSummary p                        private void updatePrefSummary Preference p            if  p instanceof ListPreference                ListPreference listPref    ListPreference  p              p setSummary listPref getEntry                       if  p instanceof EditTextPreference                EditTextPreference editTextPref    EditTextPreference  p              if  p getTitle   toString   toLowerCase   contains  password                                  p setSummary                          else                   p setSummary editTextPref getText                                     if  p instanceof MultiSelectListPreference                EditTextPreference editTextPref    EditTextPreference  p              p setSummary editTextPref getText

[android] How do I display the current value of an Android Preference in the Preference summary?

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