Working

README.md

@@ -0,0 +1,20 @@
+# RCS Exporter
+
+I've been using the app SMS Backup & Restore for years. After getting a new phone and transferring the messages over I noticed some were missing.
+
+I tried to find out why this is happening - because of a "new" message type called RCS: https://en.wikipedia.org/wiki/Rich_Communication_Services
+
+Essentially those messages are stored in a separate database on the phone, hence not considered regular text messages.
+
+The above mentioned program is not able to export those messages (as of September 2021).
+
+I didn't want to reinvent the wheel - there are already enough backup/restore apps for SMS and MMS. Instead I just wanted to be able to export the RCS messages, too. Preferably it should be a format the SMS BR can then import.
+
+So if you're interested:
+1. Backup your SMS and MMS messages with another program.
+2. Import them on the target phone.
+3. Export the RCS using this app.
+4. Import those on the new phone as well.
+
+Remarks:
+- This program has only been tested with text messages. I don't know if images, etc. can be exported as well.

app/build.gradle

@@ -11,6 +11,7 @@ android {
         targetSdk 30
         versionCode 1
         versionName "1.0"
+        useLibrary  'org.apache.http.legacy'
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }

app/src/main/AndroidManifest.xml

@@ -27,6 +27,10 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+        <!--        https://developer.android.com/about/versions/pie/android-9.0-changes-28#apache-p-->
+        <uses-library android:name="org.apache.http.legacy" android:required="false"/>
+
     </application>
 
 </manifest>

app/src/main/java/de/server47/smsexport/MainActivity.java

@@ -1,29 +1,40 @@
 package de.server47.smsexport;
 
 import android.app.Activity;
+import android.content.Intent;
 import android.database.Cursor;
 import android.net.Uri;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.widget.Button;
+import android.widget.Toast;
 
 import androidx.annotation.Nullable;
+import androidx.documentfile.provider.DocumentFile;
 
+import java.io.File;
+import java.io.IOException;
+import java.io.OutputStream;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
+import java.util.Calendar;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 public class MainActivity extends Activity
 {
-    Button bRead;
+    Button bRead, bWrite;
 
     final static int typeSMS = 0;
     final static int typeMMS = 1;
     final static int typeICS = 2;
 
+    final static int requestCodeExport = 815;
+
+    String contentToWrite = "bla";
+
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState)
     {
@@ -31,6 +42,7 @@ public class MainActivity extends Activity
         setContentView(R.layout.main_activity);
 
         bRead = (Button)findViewById(R.id.bRead);
+        bWrite = (Button)findViewById(R.id.bWrite);
 
         bRead.setOnClickListener(new View.OnClickListener()
         {
@@ -48,16 +60,24 @@ public class MainActivity extends Activity
                     export.append("backup_date=\"1631273111057\"");
                     export.append("type=\"full\">");
 //                    05.05.2001 19:15:00
-                    String pattern = "dd-MM-yyyy H:m:s";
+                    String pattern = "dd.MM.yyyy H:m:s";
                     SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
 
                     for(int i = 0; i < response.size(); i++)
                     {
+                        Calendar cal = Calendar.getInstance();
+                        cal.setTimeInMillis(Long.parseLong(response.get(i).get("date")));
+
+                        /*
+                            type: 1 = inbound
+                            type: 2 = outbound
+                        */
+
                         export.append(
                             "<sms protocol=\"0\"" +
                                 "address=\"" + response.get(i).get("remote_uri").replace("tel:", "") + "\"" +
                                 "date=\"" + response.get(i).get("date") + "\"" +
-                        "type=\"1\"" +
+                                "type=\"" + response.get(i).get("type") + "\"" +
                                 "subject=\"null\"" +
                                 "body=\"" + response.get(i).get("body") + "\"" +
                                 "toa=\"null\"" +
@@ -66,19 +86,92 @@ public class MainActivity extends Activity
                                 "read=\"1\"" +
                                 "status=\"-1\"" +
                                 "locked=\"0\"" +
-                        "date_sent=\"0\"" +
+                                "date_sent=\"" + response.get(i).get("date_sent") + "\"" +
                                 "sub_id=\"-1\"" +
-                        "readable_date=\"" + 05.05.2001 19:15:00 + "\"" +
+                                "readable_date=\"" + simpleDateFormat.format(cal.getTime()) + "\"" +
-                        "contact_name=\"(Unknown)\"/>";
+                                "contact_name=\"(Unknown)\"/>"
-                        response.get(i).get()
                         );
                     }
 
                     export.append("</smses>");
-
+                    contentToWrite = export.toString();
                 }
             }
         });
+
+        bWrite.setOnClickListener(new View.OnClickListener()
+        {
+            @Override
+            public void onClick(View v)
+            {
+                Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
+                startActivityForResult(intent, requestCodeExport);
+            }
+        });
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data)
+    {
+        super.onActivityResult(requestCode, resultCode, data);
+
+        if(resultCode == RESULT_OK)
+        {
+            switch (requestCode)
+            {
+                case requestCodeExport:
+                    if (resultCode == RESULT_OK)
+                    {
+                        Uri uriTree = data.getData();
+                        exportFiles(uriTree, contentToWrite);
+                    }
+                    break;
+            }
+        }
+    }
+
+    void exportFiles(Uri uriTree, String content)
+    {
+        String fileName = "Message_export_" + String.valueOf(Calendar.getInstance().getTimeInMillis()) + ".xml";
+
+        DocumentFile directory = DocumentFile.fromTreeUri(this, uriTree);
+
+        // Clean up
+//        for(DocumentFile file : directory.listFiles())
+//        {
+//            /*
+//                On some few users' devices it seems this caused a crash because file.getName() was null.
+//                The reason for that remains unknown, but we don't want the export to crash because of it.
+//             */
+//            if(!StringUtils.isEmpty(file.getName()))
+//            {
+//                if (file.getName().equals(XmlFileInterface.settingsFileName) && file.canWrite())
+//                    file.delete();
+//                else if (file.getName().equals(prefsFileName) && file.canWrite())
+//                    file.delete();
+//            }
+//        }
+
+        DocumentFile exportFile = directory.createFile("text/xml", fileName);
+
+        if(exportFile.canWrite())
+        {
+            try
+            {
+                OutputStream out = getApplicationContext().getContentResolver().openOutputStream(exportFile.getUri());
+                out.write(content.getBytes());
+                out.close();
+
+                Toast.makeText(MainActivity.this, "Export complete.", Toast.LENGTH_LONG).show();
+            }
+            catch (IOException e)
+            {
+                e.printStackTrace();
+                Toast.makeText(MainActivity.this, "Error while writing file.", Toast.LENGTH_LONG).show();
+            }
+        }
+//        else
+//            Toast.makeText(MainActivity.this, getResources().getString(R.string.ConfigurationExportError), Toast.LENGTH_LONG).show();
     }
 
     List<Map<String,String>> readMessages(int messageType)

app/src/main/res/layout/main_activity.xml

@@ -2,8 +2,16 @@
 <androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:layout_margin="@dimen/defaultMargin"
     android:gravity="center_horizontal">
 
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/app_name"
+        android:textAppearance="@style/TextAppearance.MaterialComponents.Headline2" />
+
     <Button
         android:id="@+id/bRead"
         android:layout_width="wrap_content"
@@ -11,4 +19,11 @@
         android:layout_gravity="center"
         android:text="Read" />
 
+    <Button
+        android:id="@+id/bWrite"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:text="Write" />
+
 </androidx.appcompat.widget.LinearLayoutCompat>

app/src/main/res/values/dimens.xml

@@ -1,3 +1,4 @@
 <resources>
     <dimen name="fab_margin">16dp</dimen>
+    <dimen name="defaultMargin">25px</dimen>
 </resources>

app/src/main/res/values/strings.xml

@@ -1,5 +1,5 @@
 <resources>
-    <string name="app_name">SmsExport</string>
+    <string name="app_name">RcsExport</string>
     <string name="action_settings">Settings</string>
     <!-- Strings used for fragments for navigation -->
     <string name="first_fragment_label">First Fragment</string>