相关插件及版本： open_file: ^3.2.1
问题：
项目中一直用的这个插件，突然发现在安卓高版本不能正常使用，报权限问题permissionDenied，断点调试提示相关权限是MANAGE_EXTERNAL_STORAGE，申请权限之后还是不行，报错内容是Failed to find configured root that contains ，如下

java.lang.RuntimeException: java.lang.IllegalArgumentException: Failed to find configured root that contains /data/data/包名/flutter_app/测试.pdf

open_file插件地址
按说明重新配置filepaths依旧不行，找到了open_file的升级版open_filex


To use this plugin, add open_filex as a dependency in your pubspec.yaml file.

dependencies:
  open_filex: ^lastVersion

Example

import 'package:open_filex/open_filex.dart';

OpenFilex.open("/sdcard/example.txt");

when Conflict with other plugins about FileProvider, add code below in your /android/app/src/main/AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          xmlns:tools="http://schemas.android.com/tools"
          package="xxx.xxx.xxxxx">
    <application>
        ...
        <provider
                android:name="androidx.core.content.FileProvider"
                android:authorities="${applicationId}.fileProvider"
                android:exported="false"
                android:grantUriPermissions="true"
                tools:replace="android:authorities">
            <meta-data
                    android:name="android.support.FILE_PROVIDER_PATHS"
                    android:resource="@xml/filepaths"
                    tools:replace="android:resource" />
        </provider>
    </application>
</manifest>

furthermore add code below in your /android/app/src/main/res/xml/filepaths.xml

<paths>
    <external-path name="external-path" path="."/>
    <external-cache-path name="external-cache-path" path="."/>
    <external-files-path name="external-files-path" path="."/>
    <files-path name="files_path" path="."/>
    <cache-path name="cache-path" path="."/>
    <root-path name="root" path="."/>
</paths>

when Android dependency ‘com.android.support:appcompat-v7’ has different version for the compile error, add code below in your /android/build.gradle

subprojects {
    project.configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support'
                    && !details.requested.name.contains('multidex') ) {
                details.useVersion "27.1.1"
            }
        }
    }
}

按说明配置问题解决了。