Build failed due to use of deprecated Android v1 embedding

If you are using Flutter and getting deprecated Android v1 embedding error then it means you are building an older version of your project.

According to Flutter Migration Guide –

In order to better support the execution environments of adding Flutter to an existing project, the old Android platform-side wrappers hosting the Flutter runtime at io.flutter.app.FlutterActivity and their associated classes are now deprecated. New wrappers at io.flutter.embedding.android.FlutterActivity and associated classes now replace them.

The complete error looks like this –

to migrate your project. You may also pass the --ignore-deprecation flag to .ignore this check and continue with the deprecated v1 embedding. However, the v1 Android embedding will be removed in future versions of Flutter.
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The detected reason was:

  C:\Users\akash\OneDrive\Desktop\Project\myapp\app\android\app\src\main\AndroidManifest.xml uses
  `android:name="io.flutter.app.FutterApplication"`
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Build failed due to use of deprecated Android v1 embedding.

Solution

The migration is a 2 step process –

Step 1: Replace io.flutter.app.FlutterActivity by io.flutter.embedding.android.FlutterActivity in MainActivity.java.

Open android/app/src/main/java/[your/package/name]/MainActivity.java and confirm that it should look like this –

import io.flutter.embedding.android.FlutterActivity;

public class MainActivity extends FlutterActivity {

}

Or, if there is content in MainActivity, then it should look like this –

import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugins.GeneratedPluginRegistrant;

 public class MainActivity extends FlutterActivity {
    private static final String CHANNEL = "samples.flutter.dev/battery";

    @Override
    public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
        new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL)
                .setMethodCallHandler(
                    (call, result) -> {
                        // Your existing code
                }
        );
    }
 }

Step 2: Open android/app/src/main/AndroidManifest.xml

a. Replace android:name="io.flutter.app.FlutterApplication" with android:name="${applicationName}".

<application
  <!-- Replace the below line 👇 -->
  <!-- android:name="io.flutter.app.FlutterApplication" -->
  android:name="${applicationName}"
  <!-- With this ☝️ -->
>
  <!-- Other code -->
</application>

b. Add meta-tag in <application> tag –

<application
  android:name="${applicationName}"
>
  <meta-data
    android:name="flutterEmbedding"
    android:value="2" />

  <!-- ☝️ Add this meta tag -->
</application>

These steps will solve the build failed issue and your app will run successfully.