Its very simple.
You can use preferences to store if this first time then show Settings Activity else always show NewsFeed Activity.
Below is the sample code to use Preferences
SharedPreferences prefs = this.getSharedPreferences("MyAppPrefs", MODE_WORLD_0);
boolean settingsFilled = prefs.getBoolean("SettingsFilled", false);
if(!settingsFilled)
{
//SHOW SETTINGS ACTIVITY
SharedPreferences prefs = this.getSharedPreferences("MyAppPrefs", 0);
Editor editor = prefs.edit();
editor.putBoolean("SettingsFilled", true);
editor.commit();
}
Use the above code in your NewsFeed Activity.