MainActivity.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    ....
        
    // Pengambilan nilai intro
    SharedPreferences preferences = getSharedPreferences("intro", Context.MODE_PRIVATE);
    Boolean introComplete = preferences.getBoolean("intro_complete", false); // secara default nilai intro bernilai false

    // Jika intro bernilai false
    if (!introComplete) {
        startActivity(new Intent(this, IntroActivity.class));
    }
}