How do you read an SMS and MMS message using .NET MAUI (on Android only)?

Question

I'd like to read an SMS and/or MMS message on an Android device only, but from within my .NET MAUI app.

Specifically, I want to save any received (MMS) picture that has been texted to me plus any associated (SMS) text. Is this possible with .NET MAUI and is there a code sample for review on this? Thank you very much!

Answer 1

Hello,

I'd like to read an SMS and/or MMS message on an Android device only,

Firstly, before you read the SMS/MMS, you need to add the permission in the <manifest> tag of Platforms/Android/Resources/AndroidManifest.xml and request permission.

Read the SMS and request permission, you can refer to this link: Access and read all SMS on Android phone with .NET MAUI

Read the MMS, you can get ID by MMS Attachment Table, then you can get Image stream by id in MMS inbox. Because this MMS file type will be text, image or others, we need to judge the file type.

In the end, we can get the stream by Stream resStream = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity.ContentResolver.OpenInputStream(PartURI1);, if you have many images, you can save this image stream in the List<Stream>.

            var res = await CheckAndRequestSMSPermission();
            if (res.Equals(PermissionStatus.Granted))
            {
#if ANDROID
                Android.Net.Uri CONTENT_URI = Android.Net.Uri.Parse("content://mms/inbox"); 

//Check your MMS inbox
                Android.Net.Uri CONTENT_URI_PART = Android.Net.Uri.Parse("content://mms/part"); 

//Check your MMS inbox
                Android.Database.ICursor cursor = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity.ContentResolver.Query(CONTENT_URI, null, null, null, null);

                List<int> mmsIDs = new List<int>();
                List<string> mmsSubjects = new List<string>();

                if (cursor.MoveToFirst())
                {
                    do
                    {
                        int id = cursor.GetInt(cursor.GetColumnIndex("_id"));//MMS Id
                        mmsIDs.Add(id);
                        string subject = cursor.GetString(cursor.GetColumnIndex("sub")); //MMS theme
                        mmsSubjects.Add(subject);

                    } while (cursor.MoveToNext());
                }

                if (mmsIDs.Count > 0)
                {
                    foreach (int id in mmsIDs)
                    {

                        string selection = "mid=" + id; //this key is the mms id。
                        Android.Database.ICursor cPart = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity.ContentResolver.Query(CONTENT_URI_PART, null, selection, null, null);
                        Android.Net.Uri partURI = Android.Net.Uri.Parse("content://mms/part/" + "_id");

                        List<Stream> allMMSFileStream = new List<Stream>();

                        String bodyStr = "";
                        String[] coloumns = null;
                        String[] values = null;
                        while (cPart.MoveToNext())
                        {
                            coloumns = cPart.GetColumnNames();
                            if (values == null)
                                values = new string[coloumns.Length];
                            for (int i = 0; i < cPart.ColumnCount; i++)
                            {
                                values[i] = cPart.GetString(i);
                            }
                            if (values[3].Equals("image/jpeg") || values[3].Equals("image/bmp") || values[3].Equals("image/gif") || values[3].Equals("image/jpg") || values[3].Equals("image/png"))
                            {  //judge the file type, if the file type is image.
                             
                                Android.Net.Uri PartURI1 = Android.Net.Uri.Parse("content://mms/part/" + values[0]);
                                Stream resStream = Microsoft.Maui.ApplicationModel.Platform.CurrentActivity.ContentResolver.OpenInputStream(PartURI1);
                                if(resStream != null)
                                {
                                    //save the Image Stream to List
                                    allMMSFileStream.Add(resStream);
                                }
                                //I make a ImageView to make a test.
                                myImage.Source = ImageSource.FromStream(()=> resStream);
                            }



                        }
                    }
                }
#endif

Best Regards,

Leon Lu

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