我在做一个文件选择窗口时遇到了一个问题，即我无法获取应用程序文件夹（com.example.kos）之外的文件，即使我的应用程序可以访问文件
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.kos">

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.RECORD_AUDIO" />
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:allowBackup="true"
        android:largeHeap="true"
        android:fullBackupContent="@xml/backup_descriptor"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <service
            android:name=".Times"
            android:enabled="true"
            android:exported="false"/>

        <activity
            android:name=".MainActivity"
            android:configChanges="uiMode"
            android:screenOrientation="fullSensor"
            android:theme="@style/AppTheme.Launcher">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

获取权限

if(ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(context, Manifest.permission.FOREGROUND_SERVICE) != PackageManager.PERMISSION_GRANTED) {
                        ActivityCompat.requestPermissions((Activity) context,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.FOREGROUND_SERVICE},REQUEST_CODE_FOLDER_CONF);
                    }

android-10（api 29）
upd:获取应用程序文件夹的路径

File currentPath = new File(context.getExternalFilesDir(null).getAbsolutePath() + "/backups");

调试和listfiles（）方法显示文件夹不是空的
但是，如果指定与我的应用程序无关的任何其他文件夹，例如下载文件夹，它会立即变为空，尽管有文件

currentPath = Environment.getExternalStoragePublicDirectory(DIRECTORY_DOWNLOADS);