What is the difference between Flutter Android Embedding V1 and V2

Flutter Android Embedding: V1 vs V2

Flutter offers two primary approaches for embedding Flutter modules into your Android applications: Embedding V1 and Embedding V2. While both achieve the same goal, they differ in their implementation and provide varying advantages depending on your project requirements.

Understanding Embedding V1

Key Features:

• Based on the FlutterActivity and FlutterFragment classes.
• Simple and straightforward integration, ideal for basic Flutter modules.
• Offers less flexibility and control over the Flutter engine.

Understanding Embedding V2

Key Features:

• Introduces the FlutterEngine class, managing the Flutter runtime.
• Provides greater control over the Flutter engine, enabling multiple Flutter instances within a single Android app.
• More complex to setup but offers higher flexibility and performance.

Comparison Table:

Example Code:

Embedding V1 (MainActivity.java):

import io.flutter.embedding.android.FlutterActivity;
public class MainActivity extends FlutterActivity {}

Embedding V2 (MainActivity.java):

import io.flutter.embedding.android.FlutterEngine;
import io.flutter.embedding.android.FlutterEngineCache;
import io.flutter.embedding.android.FlutterView;
import io.flutter.plugin.common.MethodChannel;

public class MainActivity extends AppCompatActivity {

  private FlutterEngine flutterEngine;
  private FlutterView flutterView;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    flutterEngine = new FlutterEngine(this);
    flutterView = FlutterEngineCache.getInstance().get("my_flutter_engine").getFlutterView();
    setContentView(flutterView);

    MethodChannel channel = new MethodChannel(flutterEngine.getDartExecutor(), "my_channel");
    channel.setMethodCallHandler(new MethodChannel.MethodCallHandler() {
      @Override
      public void onMethodCall(MethodCall call, Result result) {
        if (call.method.equals("getBatteryLevel")) {
          int batteryLevel = getBatteryLevel();
          result.success(batteryLevel);
        } else {
          result.notImplemented();
        }
      }
    });
  }

  private int getBatteryLevel() {
    // Logic for obtaining battery level
  }
}

Conclusion:

Choosing between Embedding V1 and V2 boils down to your project needs. For basic Flutter integrations, Embedding V1 provides a simpler solution. However, if you require greater control, flexibility, or plan to manage multiple Flutter instances, Embedding V2 is the preferred option.