How can I integrate a Flutter module into an Android native app?

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To integrate a Flutter module into an Android native app, follow the steps below:

1. Create a new Flutter module:

   a. Open a terminal window and type: flutter create module_name

   b. Rename the MainActivity to something like ModuleMainActivity

2. Build the Flutter module:

   a. Open the terminal and navigate to the module directory using cd ~/project_dir/module_name

   b. Type flutter build aar to build the module

3. Import the Flutter module to the Android app:

   a. In the Android app build.gradle file, add the following code to the repositories section:

    repositories {
        flatDir {
            dirs project(':module_name').file('libs')
        }
    }
   

   b. Add the following code to the dependencies section:

    implementation(name: 'flutter-release', ext: 'aar')
    implementation 'com.android.support:support-compat:27.1.1'
   

   c. Sync the project and rebuild the app

4. Launch the Flutter module:

   a. In the Android app, launch the Flutter module in a FlutterActivity or a FlutterFragment

   b. To use a FlutterActivity, add the following code to the Android app AndroidManifest.xml file:

    <activity android:name="com.example.module_name.ModuleMainActivity">
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </activity>
   

   c. To use a FlutterFragment, add the following code to the Android app layout file:

    <fragment
        android:id="@+id/flutter_fragment"
        android:name="io.flutter.embedding.android.FlutterFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="?attr/actionBarSize"
        app:flutterInitialRoute="/"
        app:flutterActivity="com.example.module_name.ModuleMainActivity"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
   

   d. To launch the FlutterActivity or FlutterFragment, call the startActivity or startFragment method from the Android app code:

    startActivity(FlutterActivity.createDefaultIntent(this));
    getSupportFragmentManager().beginTransaction()
                .add(R.id.flutter_fragment, FlutterFragment.createDefault())
                .commit();
   

   That's it! You can now use the Flutter module in your Android app.