修复new了线程却忘记启动

android/app/src/main/java/com/bolan/android/modules/update/Updater.java

@@ -73,9 +73,15 @@ public class Updater extends ReactContextBaseJavaModule {
                             int numRead = is.read(buf);
                             count += numRead;
                             int progress = (int) (((float) count / length) * 100);
-                            cb.invoke("downloading", progress, count, length);
+                            if (cb != null) {
+                                Log.i("Updater", cb.toString());
+                                cb.invoke("downloading", progress, count, length);
+                            }
                             if (numRead <= 0) {
-                                cb.invoke("downloaded", progress, count, length);
+                                if (cb != null) {
+                                    Log.i("Updater", cb.toString());
+                                    cb.invoke("downloaded", progress, count, length);
+                                }
                                 break;
                             }
                             fos.write(buf, 0, numRead);
@@ -117,7 +123,7 @@ public class Updater extends ReactContextBaseJavaModule {
                         }
                     }
                 }
-            });
+            }).start();
         } else {
             promise.reject("ERROR_UPDATE", "There is another updater worker running already.");
         }