Question

I have made a program code for shared preference in android. But i am confused with sharedpreference. I am updating the sharedpreference if its not the same as earlier but every time i get the same value when i retrieve its value. Also please let me knw how to delete sharedpreference on onDestroy().

Bundle bundle = this.getIntent().getExtras();
    resid=bundle.getString("locid");

    SharedPreferences app_preferences = PreferenceManager.getDefaultSharedPreferences(this);
    String prefresid = app_preferences.getString("preflocid", null);
     Log.i("pref res id is",""+prefresid);
    if(prefresid!=null)
    {
        if(resid.equalsIgnoreCase(prefresid))
        {
                Log.i("preference res id is the same","");
        }
        else
        {

            SharedPreferences.Editor e = PreferenceManager.getDefaultSharedPreferences(getBaseContext()).edit();
            Log.i("preference res id is not same","creating new");
            //SharedPreferences settings = getSharedPreferences("myfile", 0);
           //   SharedPreferences.Editor editor = settings.edit();
             e.putString("preflocid",resid);
             e.commit();
        }
    }
    else
    {
          Log.i("new preference res id created",""+prefresid);
          SharedPreferences.Editor editor = app_preferences.edit();
          editor.putString("preflocid", resid);
          editor.commit();
          Log.i("new preference res id created","");
    }

Answer 1

Have just one object of default SharedPreference and have editor onto that like:

SharedPreferences s_pref= PreferenceManager.getDefaultSharedPreferences(context);
Editor edit=s_pref.edit();

now you will have to use this editor directly wherever it is required.