我花了几个小时研究这个问题，但我没有找到解决方案（在StackOverflow或其他方面）。我的应用程序的目标是API 30，明斯克版本是29。我正在学习以下教程:https://developer.android.com/training/camera/photobasics

我的activity上有一个按钮，它可以通过一个意图打开相机:

fun takePhoto() {
    Intent(MediaStore.ACTION_IMAGE_CAPTURE).also { takePictureIntent ->
        takePictureIntent.resolveActivity(packageManager)?.also {
              startActivityForResult(takePictureIntent, CAMERA_REQUEST)
        }
    }
}

但我还想将图片保存在设备库上。因此我将TakePhoto()方法更改为:

fun takePhoto() {
    Intent(MediaStore.ACTION_IMAGE_CAPTURE).also { takePictureIntent ->
        takePictureIntent.resolveActivity(packageManager)?.also {
            val photoFile: File? = try {
                createImageFile()
            } catch (ex: IOException) {
                ex.printStackTrace()
                null
            }

            photoFile?.also {
                try {
                    val photoURI: Uri = FileProvider.getUriForFile(
                        this,
                        "net.filiperamos.photogrid.provider",
                        it
                    )

                    takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI)
                } catch (ex: IllegalArgumentException) {
                    Log.d(TAG, "Could not get file URI.")
                    ex.printStackTrace()
                }

                startActivityForResult(takePictureIntent, CAMERA_REQUEST)
            }
        }
    }
}

并添加了CreateImageFile()方法:

private fun createImageFile(): File {
    val timeStamp: String = SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(Date())
    val filename = "image_$timeStamp"
    val storageDir: File? = getExternalFilesDir(Environment.DIRECTORY_PICTURES)

    return File.createTempFile(filename, ".jpg", storageDir).apply {
        currentPhotoPath = absolutePath // Save path for later use
    }
}

我的舱单具有相机使用和外部写入权限:

<uses-feature
    android:name="android.hardware.camera"
    android:required="false" />

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

我添加了一个独立于应用程序标记的提供者:

    <provider
        android:name="androidx.core.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_paths" />
    </provider>

并创建了file_paths.xml:

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-files-path
        name="my_images"
        path="Android/data/net.ramos.photos/files/Pictures/" />
</paths>

当我在设备上运行此代码时，在运行FileProvider.GetUriForFile()时会出现异常:

java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/Android/data/net.ramos.photos/files/Pictures/image_20200823_1415398042919497737944663.jpg

如果更改file_paths.xml文件，将external-files-path替换为external-path，则错误会消失，但图像不会存储在任何地方。

我错过了什么？