delete shared preference data when i install same application means overriding application

i use shared preference for saving data but when i install same application then my shared prefere开发者_StackOverflownce data not delete it remains as it is so how to delete shared preference data when i install same application without uninstall the application means just over write on the same application.

          SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
        Editor  editor = settings.edit();
        editor.putString("MY_NAME", UserId);
         editor.putString("PASSWORD", password);
        editor.commit();
        setResult(RESULT_OK);

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I tried below code to make this work change it to suit your needs

SharedPreferences wmbPreference = PreferenceManager.getDefaultSharedPreferences(this);
boolean isFirstRun = wmbPreference.getBoolean("FIRSTRUN", true);
if (!isFirstRun)
{
    // Code on first run 
    SharedPreferences.Editor editor = wmbPreference.edit();
    editor.clear();
    editor.commit();
}
else
{
     // DO something
     SharedPreferences.Editor editor = wmbPreference.edit();
     editor.putBoolean("FIRSTRUN", false);
     editor.commit();
}