Android Shared preferences for creating one time activity example

Question

I have three activities A B and C where A and B are forms and after filling and saving the form data in database SQLITE   I am using intent from A to B and then B to C What i want is that every time I open my app I want C as my home screen and not A and B anymore   I guess shared preferences would work for this  but I cannot find a good example to give me a starting place  Any help would be appreciated

User · Answer

Best way to create SharedPreference and for global usage you need to create a class like below   public class PreferenceHelperDemo       private final SharedPreferences mPrefs       public PreferenceHelperDemo Context context            mPrefs   PreferenceManager getDefaultSharedPreferences context              private String PREF Key   Key        public String getKey             String str   mPrefs getString PREF Key               return str             public void setKey String pREF Key            Editor mEditor   mPrefs edit            mEditor putString PREF Key  pREF Key           mEditor apply

User · Answer

You can create your custom SharedPreference class  public class YourPreference          private static YourPreference yourPreference      private SharedPreferences sharedPreferences       public static YourPreference getInstance Context context            if  yourPreference    null                yourPreference   new YourPreference context                     return yourPreference             private YourPreference Context context            sharedPreferences   context getSharedPreferences  YourCustomNamedPreference  Context MODE PRIVATE              public void saveData String key String value            SharedPreferences Editor prefsEditor   sharedPreferences edit            prefsEditor  putString key  value           prefsEditor commit                          public String getData String key            if  sharedPreferences   null               return sharedPreferences getString key                         return                        You can get YourPrefrence instance like   YourPreference yourPrefrence   YourPreference getInstance context   yourPreference saveData YOUR KEY YOUR VALUE    String value   yourPreference getData YOUR KEY

User · Answer

Initialise here    SharedPreferences msharedpref   getSharedPreferences  msh                       MODE PRIVATE               Editor editor   msharedpref edit     store data    editor putString  id  uida     uida is your string to be stored editor commit    finish      fetch    SharedPreferences prefs   this getSharedPreferences  msh   Context MODE PRIVATE           uida   prefs getString  id

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Setting values in Preference     MY PREFS NAME - a static String variable like     public static final String MY PREFS NAME    quot MyPrefsFile quot   SharedPreferences Editor editor   getSharedPreferences MY PREFS NAME  MODE PRIVATE  edit     editor putString  quot name quot    quot Elena quot     editor putInt  quot idName quot   12    editor apply     Retrieve data from preference  SharedPreferences prefs   getSharedPreferences MY PREFS NAME  MODE PRIVATE    String name   prefs getString  quot name quot    quot No name defined quot      quot No name defined quot  is the default value  int idName   prefs getInt  quot idName quot   0     0 is the default value   More info  Using Shared Preferences Shared Preferences

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How to Intialize       0 - for private mode  SharedPreferences pref   getApplicationContext   getSharedPreferences  MyPref   0     Editor editor   pref edit      How to Store Data In Shared Preference   editor putString  key name    string value       Storing string   OR  editor putInt  key name    int value      Storing integer   And don t forget to apply    editor apply      How to retrieve Data From Shared Preferences    pref getString  key name   null      getting String  pref getInt  key name   0      getting Integer   Hope this will Help U

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SharedPreferences mPref  SharedPreferences Editor editor   public SharedPrefrences Context mContext        mPref   mContext getSharedPreferences Constant SharedPreferences  Context MODE PRIVATE       editor mPref edit       public void setLocation String latitude  String longitude        SharedPreferences Editor editor   mPref edit        editor putString  latitude   latitude       editor putString  longitude   longitude       editor apply       public String getLatitude         return mPref getString  latitude           public String getLongitude         return mPref getString  longitude           public void setGCM String gcm id  String device id         editor putString  gcm id   gcm id       editor putString  device id   device id       editor apply       public String getGCMId         return mPref getString  gcm id           public String getDeviceId         return mPref getString  device id            public void setUserData User user        Gson gson   new Gson        String json   gson toJson user       editor putString  user   json       editor apply      public User getUserData        Gson gson   new Gson        String json   mPref getString  user            User user   gson fromJson json  User class       return user     public void setSocialMediaStatus SocialMedialStatus status        Gson gson   new Gson        String json   gson toJson status       editor putString  status   json       editor apply      public SocialMedialStatus getSocialMediaStatus        Gson gson   new Gson        String json   mPref getString  status            SocialMedialStatus status   gson fromJson json  SocialMedialStatus class       return status

User · Answer

SharedPreferences sharedPref   getActivity   getPreferences Context MODE PRIVATE   SharedPreferences Editor editor   sharedPref edit    editor putInt getString R string saved high score   newHighScore   editor commit

User · Answer

I just found all the above examples just too confusing  so I wrote my own  Code fragments are fine if you know what you re doing  but what about people like me who don t     Want a cut-n-paste solution instead   Well here it is   Create a new java file and call it Keystore   Then paste in this code   import android content Context  import android content SharedPreferences  import android content SharedPreferences Editor  import android util Log   public class Keystore     Did you remember to vote up my example      private static Keystore store      private SharedPreferences SP      private static String filename  Keys    private Keystore Context context        SP   context getApplicationContext   getSharedPreferences filename 0      public static Keystore getInstance Context context        if  store    null            Log v  Keystore   NEW STORE            store   new Keystore context             return store     public void put String key  String value     Log v  Keystore   PUT   key     value       Editor editor   SP edit        editor putString key  value       editor commit       Stop everything and do an immediate save         editor apply     Keep going and save when you are not busy - Available only in APIs 9 and above   This is the preferred way of saving     public String get String key     Log v  Keystore   GET from   key       return SP getString key  null       public int getInt String key     Log v  Keystore   GET INT from   key       return SP getInt key  0      public void putInt String key  int num     Log v  Keystore   PUT INT   key     String valueOf num        Editor editor   SP edit         editor putInt key  num       editor commit        public void clear       Delete all shared preferences     Editor editor   SP edit         editor clear        editor commit       public void remove       Delete only the shared preference that you want     Editor editor   SP edit         editor remove filename       editor commit          Now save that file and forget about it   You re done with it  Now go back into your activity and use it like this   public class YourClass extends Activity   private Keystore store   Holds our key pairs  public YourSub Context context       store   Keystore getInstance context    Creates or Gets our key pairs   You MUST have access to current context       int  store getInt  key name to get int value        string   store get  key name to get string value         store putInt  key name to store int value  int var       store put  key name to store string value  string var

User · Answer

Shared Preferences is so easy to learn  so take a look on this  simple tutorial about sharedpreference  import android os Bundle  import android preference PreferenceActivity       public class UserSettingActivity extends PreferenceActivity         Override     public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState          addPreferencesFromResource R xml settings

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Write to Shared Preferences  SharedPreferences sharedPref   getActivity   getPreferences Context MODE PRIVATE   SharedPreferences Editor editor   sharedPref edit    editor putInt getString R string saved high score   newHighScore    editor commit       Read from Shared Preferences  SharedPreferences sharedPref   getActivity   getPreferences Context MODE PRIVATE   int defaultValue   getResources   getInteger R string saved high score default   long highScore   sharedPref getInt getString R string saved high score   defaultValue

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public class Preferences    public static final String PREF NAME    your preferences name     SuppressWarnings  deprecation   public static final int MODE   Context MODE WORLD WRITEABLE   public static final String USER ID    USER ID NEW   public static final String USER NAME    USER NAME    public static final String NAME    NAME   public static final String EMAIL    EMAIL   public static final String PHONE    PHONE   public static final String address    address    public static void writeBoolean Context context  String key  boolean value        getEditor context  putBoolean key  value  commit       public static boolean readBoolean Context context  String key          boolean defValue        return getPreferences context  getBoolean key  defValue      public static void writeInteger Context context  String key  int value        getEditor context  putInt key  value  commit        public static int readInteger Context context  String key  int defValue        return getPreferences context  getInt key  defValue      public static void writeString Context context  String key  String value        getEditor context  putString key  value  commit        public static String readString Context context  String key  String defValue        return getPreferences context  getString key  defValue      public static void writeFloat Context context  String key  float value        getEditor context  putFloat key  value  commit       public static float readFloat Context context  String key  float defValue        return getPreferences context  getFloat key  defValue      public static void writeLong Context context  String key  long value        getEditor context  putLong key  value  commit       public static long readLong Context context  String key  long defValue        return getPreferences context  getLong key  defValue      public static SharedPreferences getPreferences Context context        return context getSharedPreferences PREF NAME  MODE      public static Editor getEditor Context context        return getPreferences context  edit               Use Preferences to Write value using -      Preferences writeString getApplicationContext                        Preferences NAME   dev          Use  Preferences to Read value using -      Preferences readString getApplicationContext    Preferences NAME

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Create SharedPreferences  SharedPreferences pref   getApplicationContext   getSharedPreferences  MyPref   MODE PRIVATE    Editor editor   pref edit      Storing data as KEY VALUE pair  editor putBoolean  key name1   true                Saving boolean - true false editor putInt  key name2    int value              Saving integer editor putFloat  key name3    float value          Saving float editor putLong  key name4    long value            Saving long editor putString  key name5    string value        Saving string     Save the changes in SharedPreferences editor apply       commit changes   Get SharedPreferences data     If value for key not exist then return second param value - In this case null  boolean userFirstLogin  pref getBoolean  key name1   true       getting boolean int pageNumber pref getInt  key name2   0                  getting Integer float amount pref getFloat  key name3   null               getting Float long distance pref getLong  key name4   null               getting Long String email pref getString  key name5   null              getting String   Deleting Key value from SharedPreferences  editor remove  key name3       will delete key key name3 editor remove  key name4       will delete key key name4     Save the changes in SharedPreferences editor apply       commit changes   Clear all data from SharedPreferences   editor clear     editor apply       commit changes

User · Answer

Shared Preferences are XML files to store private primitive data in key-value pairs  Data Types include Booleans  floats  ints  longs  and strings   When we want to save some data which is accessible throughout the application  one way to do is to save it in global variable  But it will vanish once the application is closed  Another and recommended way is to save in SharedPreference  Data saved in SharedPreferences file is accessible throughout the application and persists even after the application closes or across reboots   SharedPreferences saves the data in key-value pair and can be accessed in same fashion   You can create Object of SharedPreferences using two methods   1  getSharedPreferences     Using this methods you can create Multiple   SharedPreferences and its first parameters in name of SharedPreferences   2  getPreferences     Using this method you can create Single SharedPreferences    Storing Data  Add a Variable declaration  Create Preference File  public static final String PREFERENCES FILE NAME    MyAppPreferences     Retrieve a handle to filename  using getSharedPreferences   SharedPreferences settingsfile  getSharedPreferences PREFERENCES FILE NAME 0     Open Editor and Add key-value pairs  SharedPreferences Editor myeditor   settingsfile edit     myeditor putBoolean  IITAMIYO   true    myeditor putFloat  VOLUME   0 7  myeditor putInt  BORDER   2  myeditor putLong  SIZE   12345678910L  myeditor putString  Name    Amiyo   myeditor apply       Don   t forget to apply save using myeditor apply   as shown above   Retrieving Data   SharedPreferences mysettings  getSharedPreferences PREFERENCES FILE NAME  0   IITAMIYO   mysettings getBoolean  IITAMIYO   false      returns value for the given key     second parameter gives the default value if no user preference found     set to false in above case  VOLUME   mysettings getFloat  VOLUME   0 5     0 5 being the default value if no volume preferences found    and similarly there are get methods for other data types

User · Answer

Create object of SharedPreferences          SharedPreferences sharedPref   getSharedPreferences  mypref   0              now get Editor         SharedPreferences Editor editor   sharedPref edit               put your value         editor putString  name   required Text              commits your edits         editor commit               Its used to retrieve data        SharedPreferences sharedPref   getSharedPreferences  mypref   0          String name   sharedPref getString  name                if  name equalsIgnoreCase  required Text                Log v  Matched   Required Text Matched                else                  Log v  Not Matched   Required Text Not Matched

User · Answer

You could also take a look at a past sample project of mine  written for this purpose   I saves locally a name and retrieves it either upon a user s request or when the app starts   But  at this time  it would be better to use commit  instead of apply  for persisting the data  More info here

[android] Android Shared preferences for creating one time activity (example)

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