No implementation found for method file on channel video_thumbnail

在一個flutter項目中，使用了VideoThumbnail來生成視頻的截圖，但運行會提示“No implementation found for method file on channel video_thumbnail”，相當代碼如下：

final thumbnailPath = await VideoThumbnail.thumbnailFile(
    video: video.url,
    thumbnailPath: (await getTemporaryDirectory()).path,
    imageFormat: ImageFormat.WEBP,
    maxHeight: height,
    maxWidth: width,
    // specify the height of the thumbnail, let the width auto-scaled to keep the source aspect ratio
    quality: 75,
  );

查看video.url，可以在瀏覽器中打開。發現是http開頭的，估計是android9.x（api27及以上）默認不允許http請求。使用API23的模擬器確實可以正常跑，於是打開android\app\src\main\AndroidManifest.xml,在其application添加

android:usesCleartextTraffic="true"

 

 

問題解決。以下是我使用的環境

Android Studio 4.1.2

Flutter 2.0.1