AppCompatDialogFragment更改背景颜色

public class CustomDialogFragment extends AppCompatDialogFragment {

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle("Custom Dialog")
                .setMessage("This is a custom dialog.")
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // 点击确定按钮的逻辑处理
                    }
                })
                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // 点击取消按钮的逻辑处理
                    }
                });

        AlertDialog dialog = builder.create();

        // 更改背景颜色
        if (dialog.getWindow() != null) {
            dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.RED));
        }

        return dialog;
    }
}