Question

我正在尝试将图像保存到手机本地目录。在这里，我使用image_downloader包。这是我的代码

class DownloadImage {

  Future writeToDownloadPath(GridImage imageData) async {

    try {

      var imageId = await ImageDownloader.downloadImage(imageData.url
      ,destination: AndroidDestinationType.custom(directory: 'motivational Quotes', 
      inPublicDir: true ,subDirectory: '/motivational Quotes${imageData.location}'));

      print('imageId' + imageId.toString());

      if (imageId == null) {
        return;
      }

    } catch(e) {
      print(e.toString());
    }
  }

}

当我在Android 10设备上运行并尝试下载图片时，出现此错误，

E/MethodChannel#plugins.ko2ic.com/image_downloader(25282): java.lang.IllegalStateException: Not one of standard directories: motivational Quotes

我已经在AndroidManifest中添加了android：requestLegacyExternalStorage =“ true”，并在build.gradle文件中将targetSdkVersion和compileSdkVersion设置为29。我确实清理干净并运行了代码，但问题仍然相同。

build.gradle

defaultConfig {

    applicationId "com.example.app
    minSdkVersion 21
    targetSdkVersion 29
    versionCode flutterVersionCode.toInteger()
    versionName flutterVersionName
    multiDexEnabled true
}

AndroidManifest

<application
      android:name="io.flutter.app.FlutterApplication"
      android:label="Motivational Quotes"
      android:icon="@mipmap/ic_launcher"
      android:requestLegacyExternalStorage="true">

如果有人可以帮助我解决这个问题，我将非常感谢。谢谢！

Answer 1

我在Android 10上也遇到了同样的问题，我认为保存在自定义目录中的功能与Android10不兼容。相同的代码对其他人非常有用

Answer 2

此package中只有4个标准目录。

  /// Environment.DIRECTORY_DOWNLOADS
  static final directoryDownloads =
      AndroidDestinationType._internal("DIRECTORY_DOWNLOADS");

  /// Environment.DIRECTORY_PICTURES
  static final directoryPictures =
      AndroidDestinationType._internal("DIRECTORY_PICTURES");

  /// Environment.DIRECTORY_DCIM
  static final directoryDCIM =
      AndroidDestinationType._internal("DIRECTORY_DCIM");

  /// Environment.DIRECTORY_MOVIES
  static final directoryMovies =
      AndroidDestinationType._internal("DIRECTORY_MOVIES");

因此，您必须在此处进行更改：


 var imageId = await ImageDownloader.downloadImage(imageData.url
      ,destination: AndroidDestinationType.custom(directory: 'motivational Quotes', 
      inPublicDir: true ,subDirectory: '/motivational Quotes${imageData.location}'));

我建议您保持这样简单：


 destination: AndroidDestinationType.directoryPictures
                        ..inExternalFilesDir()
                        ..subDirectory('${imageData.location}'),

不允许将图像保存到Android 10中的flutter中的本地目录

2 个答案: