Android Shared Preferences

Question

I have to share preferences using the sharedpreferences class in android and the preferences have to be shared between two activities. How shall I pass these preferences from one activity to another activity? Static variables can be used but they're not working for me.

//code for setting shared preferences SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); SharedPreferences.Editor editor = settings.edit(); editor.putString("login_session_key",response.getLogin_Session_Key()); editor.putString("user_name", username.getText().toString()); editor.commit();  //code for getting shared preferences SharedPreferences settings = getSharedPreferences(SignIn.PREFS_NAME,                 Activity.MODE_PRIVATE); username = (TextView) findViewById(R.id.username); String uname = settings.getString("user_name", null); username.setText(uname); 

Answer 1

You should either pass them to the activity via the intent call or you should read the ones you need in the new activity.

Create a helper class that handles all shared preferences calls for all your activities. Then instantiate an instance of it on any activity that needs to store/get a preference.

public class AppPreferences {      public static final String KEY_PREFS_SMS_BODY = "sms_body";      private static final String APP_SHARED_PREFS = AppPreferences.class.getSimpleName(); //  Name of the file -.xml      private SharedPreferences _sharedPrefs;      private Editor _prefsEditor;       public AppPreferences(Context context) {          this._sharedPrefs = context.getSharedPreferences(APP_SHARED_PREFS, Activity.MODE_PRIVATE);          this._prefsEditor = _sharedPrefs.edit();      }       public String getSmsBody() {          return _sharedPrefs.getString(KEY_PREFS_SMS_BODY, "");      }       public void saveSmsBody(String text) {          _prefsEditor.putString(KEY_PREFS_SMS_BODY, text);          _prefsEditor.commit();      } } 

Then in your activity ...

public class MyActivity extends Activity {      private AppPreferences _appPrefs;      public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         _appPrefs = new AppPreferences(getApplicationContext());         // ...     } } 

and

String someString = _appPrefs.getSmsBody(); 

or

_appPrefs.saveSmsBody(someString);