访问文件时权限被拒绝Android 11

Question

我在安卓中访问文本文件，但权限被拒绝的errno13出现，我已经给了所有的存储权限

这是显示的logcat错误

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应用权限代码

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Answer 1

从Chaquopy FAQ

从API level 29开始，即使你的应用程序拥有READ_EXTERNAL_STORAGE权限，安卓也会有一个scoped storage policy来阻止直接访问外部存储。相反，您可以使用system file picker，并将文件作为字节数组传递给Python：

val REQUEST_OPEN = 0

fun myMethod() {
    startActivityForResult(
        Intent(if (Build.VERSION.SDK_INT >= 19) Intent.ACTION_OPEN_DOCUMENT
               else Intent.ACTION_GET_CONTENT).apply {
            addCategory(Intent.CATEGORY_OPENABLE)
            setType("*/*")
        }, REQUEST_OPEN)
}

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    if (requestCode == REQUEST_OPEN && resultCode == RESULT_OK) {
        val uri = data!!.data!!
        // For Java, see https://stackoverflow.com/a/10297073
        val content = contentResolver.openInputStream(uri)!!.use { it.readBytes() }
        myPythonModule.callAttr("process", content)
    }
}

然后，Python函数可以随心所欲地访问文件内容：

def process(content):
    # `content` is already a bytes-like object, but if you need a standard bytes object:
    content = bytes(content)

    # If you need a file-like object:
    import io
    content_file = io.BytesIO(content)

    # If you need a filename (less efficient):
    import tempfile
    with tempfile.NamedTemporaryFile() as temp_file:
        temp_file.write(content)
        filename = temp_file.name  # Valid only inside the `with` block.

Answer 2

除了在程序的初始运行期间获得这些权限(READ_EXTERNAL_STORAGE、WRITE_EXTERNAL_STORAGE)之外，还必须将以下代码添加到标记中的AndroidManifest.xml文件中。

  android: requestLegacyExternalStorage = "true"