在Android 11中，从Gallery中选择、裁剪和保存图像的方式发生了变化。下面是一个示例代码，它实现了在Android 11设备上从Gallery中选择、裁剪和保存图像的功能。

首先，你需要在AndroidManifest.xml文件中添加访问外部存储权限：

然后在你的Activity中，你需要请求访问Gallery的权限：

private static final int REQUEST_CODE_GALLERY_PERMISSIONS = 101;

private void requestGalleryPermissions() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED
            || ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE},
                REQUEST_CODE_GALLERY_PERMISSIONS);
    } else {
        chooseImageFromGallery();
    }
}

如果用户允许访问权限，你可以调用chooseImageFromGallery()方法来选择图像：

private static final int REQUEST_CODE_CHOOSE_IMAGE = 102;

private void chooseImageFromGallery() {
    Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
    intent.addCategory(Intent.CATEGORY_OPENABLE);
    intent.setType("image/*");
    startActivityForResult(intent, REQUEST_CODE_CHOOSE_IMAGE);
}

在onActivityResult()方法中，你可以处理选中图像的结果：

private static final int REQUEST_CODE_CROP_IMAGE = 103;

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (resultCode == RESULT_OK) {
        if (requestCode == REQUEST_CODE_CHOOSE_IMAGE) {
            Uri uri = data.getData();
            cropImage(uri);
        } else if (requestCode == REQUEST_CODE_CROP_IMAGE) {
            Bitmap bitmap = data.getParcelableExtra("data");
            saveImage(bitmap);
        }
    }
}

最后，你可以使用