packages/flutter_tools/templates/plugin/android.tmpl/src/main/AndroidManifest.xml.tmpl

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="{{androidIdentifier}}"
  android:versionCode="1"
  android:versionName="0.0.1">

  <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="21" />
</manifest>