react-native/local-cli/generator-android/templates/package/MainActivity.java

package <%= package %>;

import com.facebook.react.ReactActivity;

public class MainActivity extends ReactActivity {

    /**
     * Returns the name of the main component registered from JavaScript.
     * This is used to schedule rendering of the component.
     */
    @Override
    protected String getMainComponentName() {
        return "<%= name %>";
    }
}