fix: 修复下载状态更新不及时的问题

app/src/main/java/com/gh/download/DownloadManager.java

@@ -846,6 +846,8 @@ public class DownloadManager implements DownloadStatusListener {
     public void addObserver(DataWatcher dataWatcher) {
         Utils.log(DownloadManager.class.getSimpleName(), "addObserver");
         DataChanger.INSTANCE.addObserver(dataWatcher);
+
+        notifyDownloadedStatusASAP(dataWatcher);
     }
 
     /**
@@ -856,6 +858,18 @@ public class DownloadManager implements DownloadStatusListener {
         DataChanger.INSTANCE.deleteObserver(dataWatcher);
     }
 
+    /**
+     * 立马通知 dataWatcher 更新已下载完的任务状态，这里的下载完成是持久状态，不是瞬时状态
+     *
+     */
+    private void notifyDownloadedStatusASAP(DataWatcher dataWatcher) {
+        for (DownloadEntity downloadEntity : getAllDownloadEntitySnapshots()) {
+            if (downloadEntity.getStatus() == DownloadStatus.done) {
+                dataWatcher.onDataInit(downloadEntity);
+            }
+        }
+    }
+
     /**
      * 初始化下载服务
      */