How do I get the SharedPreferences from a PreferenceActivity in Android

Question

I am using a PreferenceActivity to show some settings for my application  I am inflating the settings via a xml file so that my onCreate  and complete class methods  looks like this    public class FooActivity extends PreferenceActivity        Override     public void onCreate Bundle icicle            super onCreate icicle           addPreferencesFromResource R xml preference             The javadoc of PreferenceActivity PreferenceFragment states that      These preferences will automatically save to SharedPreferences as the user interacts with them  To retrieve an instance of SharedPreferences that the preference hierarchy in this activity will use  call getDefaultSharedPreferences android content Context  with a context in the same package as this activity    But how I get the name of the SharedPreference in another Activity  I can only call   getSharedPreferences name  mode    in the other activity but I need the name of the SharedPreference which was used by the PreferenceActivity  What is the name or how can i retrieve it

User · Answer

Try following source code it worked for me    Fetching id from shared preferences     SharedPreferences sharedPreferences      sharedPreferences  getSharedPreferences Constant SHARED PREF NAME  Context MODE PRIVATE       getUserLogin   sharedPreferences getString Constant ID SHARED PREF

User · Answer

If you don t have access to getDefaultSharedPreferenes    you can use getSharedPreferences name  mode  instead  you just have to pass in the right name   Android creates this name  possibly based on the package name of your project     You can get it by putting the following code in a SettingsActivity onCreate    and seeing what preferencesName is   String preferencesName   this getPreferenceManager   getSharedPreferencesName      The string should be something like com example projectname preferences   Hard code that somewhere in your project  and pass it in to getSharedPreferences   and you should be good to go

User · Answer

Declare these methods first    public static void putPref String key  String value  Context context        SharedPreferences prefs   PreferenceManager getDefaultSharedPreferences context       SharedPreferences Editor editor   prefs edit        editor putString key  value       editor commit       public static String getPref String key  Context context        SharedPreferences preferences   PreferenceManager getDefaultSharedPreferences context       return preferences getString key  null       Then call this when you want to put a pref   putPref  myKey    mystring   getApplicationContext       call this when you want to get a pref   getPref  myKey   getApplicationContext       Or  you can use this object https   github com kcochibili TinyDB--Android-Shared-Preferences-Turbo  which simplifies everything even further  Example   TinyDB tinydb   new TinyDB context    tinydb putInt  clickCount   2   tinydb putFloat  xPoint   3 6f   tinydb putLong  userCount   39832L    tinydb putString  userName    john    tinydb putBoolean  isUserMale   true     tinydb putList  MyUsers   mUsersArray   tinydb putImagePNG  DropBox WorkImages    MeAtlunch png   lunchBitmap

User · Answer

if you have a checkbox and you would like to fetch it s value ie true   false in any java file--  Use--  Context mContext  boolean checkFlag   checkFlag PreferenceManager getDefaultSharedPreferences mContext  getBoolean KEY DEFAULT VALUE

User · Answer

import android preference PreferenceManager  SharedPreferences prefs   PreferenceManager getDefaultSharedPreferences this      then you use prefs getBoolean  keystring   true     Update  According to Shared Preferences   Android Developer Tutorial  Part 13  by Sai Geetha M N      Many applications may provide a way to capture user preferences on the   settings of a specific application or an activity  For supporting   this  Android provides a simple set of APIs        Preferences are typically name value pairs  They can be stored as      Shared Preferences    across various activities in an application  note   currently it cannot be shared across processes   Or it can be   something that needs to be stored specific to an activity     Shared Preferences  The shared preferences can be used by all the components  activities  services etc  of the applications  Activity handled preferences  These preferences can only be used within the particular activity and can not be used by other components of the application    Shared Preferences   The shared preferences are managed with the help of getSharedPreferences method of the Context class  The preferences are stored in a default file  1  or you can specify a file name  2  to be used to refer to the preferences    1  The recommended way is to use by the default mode  without specifying the file name  SharedPreferences preferences   PreferenceManager getDefaultSharedPreferences context      2  Here is how you get the instance when you specify the file name  public static final String PREF FILE NAME    PrefFile   SharedPreferences preferences   getSharedPreferences PREF FILE NAME  MODE PRIVATE     MODE PRIVATE is the operating mode for the preferences  It is the default mode and means the created file will be accessed by only the calling application   Other two modes supported are MODE WORLD READABLE and MODE WORLD WRITEABLE  In MODE WORLD READABLE other application can read the created file but can not modify it  In case of MODE WORLD WRITEABLE other applications also have write permissions for the created file   Finally  once you have the preferences instance  here is how you can retrieve the stored values from the preferences   int storedPreference   preferences getInt  storedInt   0     To store values in the preference file SharedPreference Editor object has to be used  Editor is a nested interface in the SharedPreference class   SharedPreferences Editor editor   preferences edit    editor putInt  storedInt   storedPreference      value to store editor commit      Editor also supports methods like remove   and clear   to delete the preference values from the file   Activity Preferences   The shared preferences can be used by other application components  But if you do not need to share the preferences with other components and want to have activity private preferences you can do that with the help of getPreferences   method of the activity  The getPreference method uses the getSharedPreferences   method with the name of the activity class for the preference file name   Following is the code to get preferences  SharedPreferences preferences   getPreferences MODE PRIVATE   int storedPreference   preferences getInt  storedInt   0     The code to store values is also the same as in case of shared preferences   SharedPreferences preferences   getPreference MODE PRIVATE   SharedPreferences Editor editor   preferences edit    editor putInt  storedInt   storedPreference      value to store editor commit      You can also use other methods like storing the activity state in database  Note Android  also contains a package called android preference  The package defines classes to implement application preferences UI   To see some more examples check Android s Data Storage post on developers site

User · Answer

having to pass context around everywhere is really annoying me  the code becomes too verbose and unmanageable  I do this in every project instead     public class global       public static Activity globalContext   null    and set it in the main activity create    Override public void onCreate Bundle savedInstanceState        Thread setDefaultUncaughtExceptionHandler new CustomExceptionHandler              global sdcardPath                        super onCreate savedInstanceState          Start        Debug startMethodTracing  appname Trace1         global globalContext   this    also all preference keys should be language independent  I m shocked nobody has mentioned that   getText R string yourPrefKeyName  toString     now call it very simply like this in one line of code  global globalContext getSharedPreferences global APPNAME PREF  global MODE PRIVATE  getBoolean  isMetric   true

[java] How do I get the SharedPreferences from a PreferenceActivity in Android?

Examples related to java

Examples related to android

Examples related to sharedpreferences

Examples related to preferenceactivity