如何在 Android 中使用 REST API 调用 SharePoint 中的列表项？

Question

I'm want to consume share point rest API service to call from Android previously i use to call share point web service through the graph API but while generating token from graph API its not support in below URL, does any one have any solution about this problem.

https://mysharepoint.sharepoint.com/sites/MySite/_api/web/lists/getbytitle ('Announcements')/Items

 JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, MSGRAPH_URL,
            parameters,new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            /* Successfully called graph, process data and send to UI */
            Log.d(TAG, "Response: " + response.toString());


            updateGraphUI(response);
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.d(TAG, "Error: " + error.toString());
        }
    }) {
        @Override
        public Map<String, String> getHeaders() throws AuthFailureError {
            Map<String, String> headers = new HashMap<>();
            headers.put("Authorization", "Bearer " + authResult.getAccessToken());
            return headers;
        }
    };

    Log.d(TAG, "Adding HTTP GET to Queue, Request: " + request.toString());

    request.setRetryPolicy(new DefaultRetryPolicy(
            3000,
            DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
            DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    queue.add(request);

I already tried with MSAL library but its does not work with this token. Update : i used to call graph api for janrating token but i got 401 error with this above mention URL.

Answer 1

You are calling a SharePoint API, so you will need a SharePoint token instead of a Graph token. These are two separate APIs with different authentications.

To get a SharePoint token you will need to register an App in SharePoint itself or use the users username + password if available in your app.

Also see: https://spshell.blogspot.com/2015/03/sharepoint-online-o365-oauth.html https://shareyourpoint.net/2017/01/25/operations-using-rest-in-sharepoint-online-authorization/

For Graph, use an URL like this to get your list items:

https://graph.microsoft.com/v1.0/sites/ {site-id}/lists/{list-id}/items?expand=fields(select=Column1,Column2)

You will probably need to do several calls to get your site ID and list ID first.

https://docs.microsoft.com/en-us/graph/api/listitem-list?view=graph-rest-1.0