android download notification, also fix updatemessageflags didnt work on android

android/app/src/main/kotlin/im/cwtch/flwtch/FlwtchWorker.kt

@@ -60,6 +60,7 @@ class FlwtchWorker(context: Context, parameters: WorkerParameters) :
                 if (Cwtch.startCwtch(appDir, torPath) != 0.toLong()) return Result.failure()
 
                 Log.i("FlwtchWorker.kt", "startCwtch success, starting coroutine AppbusEvent loop...")
+                val downloadIDs = mutableMapOf<String, Int>()
                 while(true) {
                     val evt = MainActivity.AppbusEvent(Cwtch.getAppBusEvent())
                     if (evt.EventType == "NewMessageFromPeer" || evt.EventType == "NewMessageFromGroup") {
@@ -97,10 +98,46 @@ class FlwtchWorker(context: Context, parameters: WorkerParameters) :
                                     .build()
                             notificationManager.notify(getNotificationID(data.getString("ProfileOnion"), handle), newNotification)
                         }
+                    } else if (evt.EventType == "FileDownloadProgressUpdate") {
+                        try {
+                            val data = JSONObject(evt.Data);
+                            val fileKey = data.getString("FileKey");
+                            val title = data.getString("NameSuggestion");
+                            val progress = data.getString("Progress").toInt();
+                            val progressMax = data.getString("FileSizeInChunks").toInt();
+                            if (!downloadIDs.containsKey(fileKey)) {
+                                downloadIDs.put(fileKey, downloadIDs.count());
+                            }
+                            var dlID = downloadIDs.get(fileKey);
+                            if (dlID == null) {
+                                dlID = 0;
+                            }
+                            val channelId =
+                                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                                        createDownloadNotificationChannel(fileKey, fileKey)
+                                    } else {
+                                        // If earlier version channel ID is not used
+                                        // https://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html#NotificationCompat.Builder(android.content.Context)
+                                        ""
+                                    };
+                            val newNotification = NotificationCompat.Builder(applicationContext, channelId)
+                                    .setOngoing(true)
+                                    .setContentTitle("Downloading")//todo: translate
+                                    .setContentText(title)
+                                    .setSmallIcon(android.R.drawable.stat_sys_download)
+                                    .setProgress(progressMax, progress, false)
+                                    .setSound(null)
+                                    //.setSilent(true)
+                                    .build();
+                            notificationManager.notify(dlID, newNotification);
+                        } catch (e: Exception) {
+                            Log.i("FlwtchWorker->FileDownloadProgressUpdate", e.toString() + " :: " + e.getStackTrace());
+                        }
                     } else if (evt.EventType == "FileDownloaded") {
                         Log.i("FlwtchWorker", "file downloaded!");
                         val data = JSONObject(evt.Data);
                         val tempFile = data.getString("TempFile");
+                        val fileKey = data.getString("FileKey");
                         if (tempFile != "") {
                             val filePath = data.getString("FilePath");
                             Log.i("FlwtchWorker", "moving "+tempFile+" to "+filePath);
@@ -115,6 +152,9 @@ class FlwtchWorker(context: Context, parameters: WorkerParameters) :
                                 Files.delete(sourcePath);
                             }
                         }
+                        if (downloadIDs.containsKey(fileKey)) {
+                            notificationManager.cancel(downloadIDs.get(fileKey)?:0);
+                        }
                     }
 
                     Intent().also { intent ->
@@ -310,6 +350,15 @@ class FlwtchWorker(context: Context, parameters: WorkerParameters) :
         return channelId
     }
 
+    @RequiresApi(Build.VERSION_CODES.O)
+    private fun createDownloadNotificationChannel(channelId: String, channelName: String): String{
+        val chan = NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_LOW)
+        chan.lightColor = Color.MAGENTA
+        chan.lockscreenVisibility = Notification.VISIBILITY_PRIVATE
+        notificationManager.createNotificationChannel(chan)
+        return channelId
+    }
+
     companion object {
         const val KEY_METHOD = "KEY_METHOD"
         const val KEY_ARGS = "KEY_ARGS"

android/app/src/main/kotlin/im/cwtch/flwtch/MainActivity.kt

@@ -60,6 +60,7 @@ class MainActivity: FlutterActivity() {
     private var dlToHandle = ""
     private var dlToFileKey = ""
 
+    // handles clicks received from outside the app (ie, notifications)
     override fun onNewIntent(intent: Intent) {
         super.onNewIntent(intent)
         if (notificationClickChannel == null || intent.extras == null) return
@@ -81,6 +82,7 @@ class MainActivity: FlutterActivity() {
         }
     }
 
+    // handles return values from the system file picker
     override fun onActivityResult(requestCode: Int, result: Int, intent: Intent?) {
         if (intent == null || intent!!.getData() == null) {
             Log.i("MainActivity:onActivityResult", "user canceled activity");
@@ -89,15 +91,13 @@ class MainActivity: FlutterActivity() {
 
         val filePath = intent!!.getData().toString();
         val manifestPath = StringBuilder().append(this.applicationContext.cacheDir).append("/").append(this.dlToFileKey).toString();
-        Log.i("onActivityResult", "got download path: " + filePath);
-        Log.i("onActivityResult", "got manifest path: " + manifestPath);
         handleCwtch(MethodCall("DownloadFile", mapOf(
             "ProfileOnion" to this.dlToProfile,
             "handle" to this.dlToHandle,
             "filepath" to filePath,
             "manifestpath" to manifestPath,
             "filekey" to this.dlToFileKey
-        )), ErrorLogResult(""));//placeholder; result is never actually invoked
+        )), ErrorLogResult(""));//placeholder; this Result is never actually invoked
     }
 
     override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {

lib/cwtch/gomobile.dart

@@ -198,7 +198,7 @@ class CwtchGomobile implements Cwtch {
   @override
   void UpdateMessageFlags(String profile, String handle, int index, int flags) {
     print("gomobile.dart UpdateMessageFlags " + index.toString());
-    cwtchPlatform.invokeMethod("UpdateMessageFlags", {"profile": profile, "contact": handle, "index": index, "flags": flags});
+    cwtchPlatform.invokeMethod("UpdateMessageFlags", {"profile": profile, "contact": handle, "midx": index, "flags": flags});
   }
 
   @override

lib/widgets/filebubble.dart

@@ -98,7 +98,7 @@ class FileBubbleState extends State<FileBubble> {
         wdgDecorations = Text('Checking download status...' + '\u202F');
         Provider.of<FlwtchState>(context, listen: false).cwtch.CheckDownloadStatus(Provider.of<ProfileInfoState>(context, listen: false).onion, widget.fileKey());
       } else {
-        wdgDecorations = Text('Saved to: ' + (path??"null") + '\u202F');
+        wdgDecorations = Text('Saved to: ' + path + '\u202F');
       }
     } else {
       wdgDecorations = Center(