Flutter Mobile Development · Pelajaran

Navigasi Halaman Dasar

Pelajari cara mendorong dan mengeluarkan rute menggunakan Navigator, sehingga Anda dapat membuat transisi sederhana antar-layar dalam aplikasi Flutter.

Pelajaran 1 dari 411 langkah

Navigasi Halaman Dasar adalah pelajaran Flutter Mobile Development gratis di CoddyKit. Ini adalah pelajaran 1 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar Flutter Mobile Development, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus Flutter Mobile Development mencakup 4 pelajaran total.

Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.

Navigating Your App

Think of a mobile app as a collection of pages or "screens." Navigation is how users move between these screens, like going from a product list to a product detail page.

Apps need a clear way to move forward.
Apps also need a way to go back.
Flutter provides powerful tools for this.

Meet the Navigator

In Flutter, the Navigator widget manages a stack of Route objects. When you want to show a new screen, you "push" a route onto this stack. When you want to go back, you "pop" a route off the stack.

It's like a stack of playing cards.
New cards go on top (push).
You remove cards from the top (pop).

Understanding Routes

A Route is an abstraction for a "screen" or "page" in your app. Flutter provides a common type of route called MaterialPageRoute, which creates a platform-specific transition animation (like sliding in from the right on Android).

It's the blueprint for how a new screen will look and behave when shown.

Moving Forward with push()

To navigate to a new screen, you use Navigator.push(). This method takes a BuildContext and a MaterialPageRoute as arguments.

The builder function inside MaterialPageRoute tells Flutter which widget to build for the new screen.

Try Pushing a Route

This example shows how to push a new screen when a button is pressed. Run it and tap the button!

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomeScreen(),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Home Screen')),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => SecondScreen()),
            );
          },
          child: const Text('Go to Second Screen'),
        ),
      ),
    );
  }
}

class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Second Screen')),
      body: const Center(
        child: Text('You are on the second screen!'),
      ),
    );
  }
}

What is BuildContext?

You might have noticed context being passed around. BuildContext is a handle to the location of a widget in the widget tree. It helps widgets locate other widgets or data higher up in the tree.

The Navigator uses this context to know which navigation stack to operate on.

Going Back with pop()

When you want to return to the previous screen, you "pop" the current route off the navigation stack using Navigator.pop(). This will reveal the screen that was underneath.

Flutter's AppBar often provides a back button automatically when a new route is pushed, which internally calls Navigator.pop().

Try Popping a Route

Let's modify our previous example to include a button on the second screen that allows us to explicitly go back to the home screen.

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomeScreen(),
    );
  }
}

class HomeScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Home Screen')),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => SecondScreen()),
            );
          },
          child: const Text('Go to Second Screen'),
        ),
      ),
    );
  }
}

class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Second Screen')),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            Navigator.pop(context); // This will go back!
          },
          child: const Text('Go Back'),
        ),
      ),
    );
  }
}

Visualizing the Stack

Imagine the Navigator maintains a stack of screens. When you push, a new screen is placed on top. When you pop, the top screen is removed.

The user always sees the topmost screen. This stack behavior is fundamental to how navigation works in Flutter.

Push: Adds to top.
Pop: Removes from top.
First screen is at the bottom.

Navigation Check

Consider a Flutter app with two screens, ScreenA and ScreenB. If you are currently on ScreenA and want to move to ScreenB, then later return to ScreenA, which sequence of Navigator methods would you use?

Jawab di pelajaran interaktif

Recap: Basic Navigation

Great job! You've learned the core concepts of basic navigation in Flutter:

The Navigator manages a stack of routes.
MaterialPageRoute defines a new screen.
Navigator.push() adds a new screen to the stack.
Navigator.pop() removes the current screen from the stack.
BuildContext is essential for navigation operations.

Next, we'll explore more advanced navigation techniques like named routes!

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Pertanyaan yang Sering Diajukan

Apakah pelajaran “Navigasi Halaman Dasar” gratis?

Ya — teks lengkap “Navigasi Halaman Dasar” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus Flutter Mobile Development, upgrade ke CoddyKit PRO. Kursus Flutter Mobile Development mencakup 4 pelajaran total.

Apa yang akan aku pelajari di “Navigasi Halaman Dasar”?

Pelajari cara mendorong dan mengeluarkan rute menggunakan Navigator, sehingga Anda dapat membuat transisi sederhana antar-layar dalam aplikasi Flutter. Kamu berlatih Flutter Mobile Development dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.

Apakah aku perlu pengalaman untuk memulai Flutter Mobile Development?

Tidak diperlukan pengalaman sebelumnya. Flutter Mobile Development di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 1 dari 4.

Berapa lama pelajaran “Navigasi Halaman Dasar” memakan waktu?

Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.

Bisakah aku menulis dan menjalankan kode dalam pelajaran Flutter Mobile Development ini?

Ya. Setiap pelajaran Flutter Mobile Development menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.

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