Make download progress step size configurable (#435)

* Make download progress step size configurable, not just every 5%.

Co-authored-by: David Butler <github@nimisis.com>
Co-authored-by: Bartek Pacia <barpac02@gmail.com>

Author: 3 people

android/src/main/java/vn/hunghd/flutterdownloader/DownloadWorker.java

@@ -81,13 +81,13 @@ public class DownloadWorker extends Worker implements MethodChannel.MethodCallHa
     public static final String ARG_OPEN_FILE_FROM_NOTIFICATION = "open_file_from_notification";
     public static final String ARG_CALLBACK_HANDLE = "callback_handle";
     public static final String ARG_DEBUG = "debug";
+    public static final String ARG_STEP_UPDATE = "step_update";
     public static final String ARG_SAVE_IN_PUBLIC_STORAGE = "save_in_public_storage";
     public static final String ARG_IGNORESSL = "ignoreSsl";
 
     private static final String TAG = DownloadWorker.class.getSimpleName();
     private static final int BUFFER_SIZE = 4096;
     private static final String CHANNEL_ID = "FLUTTER_DOWNLOADER_NOTIFICATION";
-    private static final int STEP_UPDATE = 5;
 
     private static final AtomicBoolean isolateStarted = new AtomicBoolean(false);
     private static final ArrayDeque<List<Object>> isolateQueue = new ArrayDeque<>();
@@ -108,6 +108,7 @@ public class DownloadWorker extends Worker implements MethodChannel.MethodCallHa
     private int primaryId;
     private String msgStarted, msgInProgress, msgCanceled, msgFailed, msgPaused, msgComplete;
     private long lastCallUpdateNotification = 0;
+    private int stepUpdate;
     private boolean saveInPublicStorage;
 
     public DownloadWorker(@NonNull final Context context,
@@ -188,6 +189,7 @@ public Result doWork() {
         String headers = getInputData().getString(ARG_HEADERS);
         boolean isResume = getInputData().getBoolean(ARG_IS_RESUME, false);
         debug = getInputData().getBoolean(ARG_DEBUG, false);
+        stepUpdate = getInputData().getInt(ARG_STEP_UPDATE, 10);
         ignoreSsl = getInputData().getBoolean(ARG_IGNORESSL, false);
 
         Resources res = getApplicationContext().getResources();
@@ -416,7 +418,7 @@ private void downloadFile(Context context, String fileURL, String savedDir, Stri
                     int progress = (int) ((count * 100) / (contentLength + downloadedBytes));
                     outputStream.write(buffer, 0, bytesRead);
 
-                    if ((lastProgress == 0 || progress > lastProgress + STEP_UPDATE || progress == 100)
+                    if ((lastProgress == 0 || progress > (lastProgress + stepUpdate) || progress == 100)
                             && progress != lastProgress) {
                         lastProgress = progress;
 

android/src/main/java/vn/hunghd/flutterdownloader/FlutterDownloaderPlugin.java

@@ -44,6 +44,7 @@ public class FlutterDownloaderPlugin implements MethodCallHandler, FlutterPlugin
     private TaskDao taskDao;
     private Context context;
     private long callbackHandle;
+    private int stepUpdate;
     private int debugMode;
     private int ignoreSsl;
 
@@ -126,6 +127,7 @@ private WorkRequest buildRequest(String url, String savedDir, String filename, S
                         .putBoolean(DownloadWorker.ARG_OPEN_FILE_FROM_NOTIFICATION, openFileFromNotification)
                         .putBoolean(DownloadWorker.ARG_IS_RESUME, isResume)
                         .putLong(DownloadWorker.ARG_CALLBACK_HANDLE, callbackHandle)
+                        .putInt(DownloadWorker.ARG_STEP_UPDATE, stepUpdate)
                         .putBoolean(DownloadWorker.ARG_DEBUG, debugMode == 1)
                         .putBoolean(DownloadWorker.ARG_IGNORESSL, ignoreSsl == 1)
                         .putBoolean(DownloadWorker.ARG_SAVE_IN_PUBLIC_STORAGE, saveInPublicStorage)
@@ -158,6 +160,7 @@ private void initialize(MethodCall call, MethodChannel.Result result) {
     private void registerCallback(MethodCall call, MethodChannel.Result result) {
         List args = (List) call.arguments;
         callbackHandle = Long.parseLong(args.get(0).toString());
+        stepUpdate = Integer.parseInt(args.get(1).toString());
         result.success(null);
     }
 

ios/Classes/FlutterDownloaderPlugin.m

@@ -29,8 +29,6 @@
 #define ERROR_NOT_INITIALIZED [FlutterError errorWithCode:@"not_initialized" message:@"initialize() must called first" details:nil]
 #define ERROR_INVALID_TASK_ID [FlutterError errorWithCode:@"invalid_task_id" message:@"not found task corresponding to given task id" details:nil]
 
-#define STEP_UPDATE 5
-
 @interface FlutterDownloaderPlugin()<NSURLSessionTaskDelegate, NSURLSessionDownloadDelegate, UIDocumentInteractionControllerDelegate>
 {
     FlutterEngine *_headlessRunner;
@@ -43,6 +41,7 @@ @interface FlutterDownloaderPlugin()<NSURLSessionTaskDelegate, NSURLSessionDownl
     NSString *_allFilesDownloadedMsg;
     NSMutableArray *_eventQueue;
     int64_t _callbackHandle;
+    int _stepUpdate;
 }
 
 @property(nonatomic, strong) dispatch_queue_t databaseQueue;
@@ -562,6 +561,7 @@ - (void)didInitializeDispatcherMethodCall:(FlutterMethodCall*)call result:(Flutt
 - (void)registerCallbackMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
     NSArray *arguments = call.arguments;
     _callbackHandle = [arguments[0] longLongValue];
+    _stepUpdate = [arguments[1] intValue];
     result([NSNull null]);
 }
 
@@ -868,7 +868,7 @@ - (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTas
         NSString *taskId = [self identifierForTask:downloadTask];
         int progress = round(totalBytesWritten * 100 / (double)totalBytesExpectedToWrite);
         NSNumber *lastProgress = _runningTaskById[taskId][KEY_PROGRESS];
-        if (([lastProgress intValue] == 0 || (progress > [lastProgress intValue] + STEP_UPDATE) || progress == 100) && progress != [lastProgress intValue]) {
+        if (([lastProgress intValue] == 0 || (progress > ([lastProgress intValue] + _stepUpdate)) || progress == 100) && progress != [lastProgress intValue]) {
             [self sendUpdateProgressForTaskId:taskId inStatus:@(STATUS_RUNNING) andProgress:@(progress)];
             __typeof__(self) __weak weakSelf = self;
             dispatch_sync(databaseQueue, ^{

lib/src/downloader.dart

@@ -360,13 +360,16 @@ class FlutterDownloader {
   ///```
   ///
   /// {@end-tool}
-  static registerCallback(DownloadCallback callback) {
+  static registerCallback(DownloadCallback callback, {int stepSize = 10}) {
     assert(_initialized, 'plugin flutter_downloader is not initialized');
 
     final callbackHandle = PluginUtilities.getCallbackHandle(callback)!;
+    assert(callbackHandle != null, 'callback must be a top-level or static function');
+    assert(stepSize >= 0 && stepSize <= 100, 'Step size should be between 0-100');
+  
     _channel.invokeMethod(
       'registerCallback',
-      <dynamic>[callbackHandle.toRawHandle()],
+      <dynamic>[callbackHandle.toRawHandle(), stepSize],
     );
   }