Update RxDrive.java

rxdrive/src/main/java/com/francescocervone/rxdrive/RxDrive.java

@@ -462,6 +462,37 @@ public Observable<DriveId> call() {
             }
         }).subscribeOn(Schedulers.io());
     }
+
+    /**
+     * Updates a file on Drive
+     *
+     * @param driveFile drive file
+     * @param content the content to write
+     * @return an Observable with the DriveId
+     */
+    public Observable<DriveFile> updateFile(final DriveFile driveFile, final ByteArrayInputStream content) {
+        return Observable.defer(new Func0<Observable<DriveFile>>() {
+            @Override
+            public Observable<DriveFile> call() {
+                DriveApi.DriveContentsResult driveContentsResult = driveFile
+                        .open(getGoogleApiClient(), DriveFile.MODE_WRITE_ONLY, null)
+                        .await();
+                DriveContents driveContents = driveContentsResult.getDriveContents();
+                try {
+                    IOUtils.copy(content, driveContents.getOutputStream());
+                    Status status = driveContents.commit(getGoogleApiClient(), null).await();
+                    if (status.isSuccess()) {
+                        return Observable.just(driveFile);
+                    } else {
+                        return Observable.error(new RxDriveException(status));
+                    }
+                } catch (IOException e) {
+                    e.printStackTrace();
+                    return Observable.error(e);
+                }
+            }
+        });
+    }
 
     /**
      * Creates a new folder
@@ -550,6 +581,21 @@ public Observable<Boolean> call() {
             }
         }).subscribeOn(Schedulers.io());
     }
+
+    /**
+     * Do sync
+     *
+     * @return nothing
+     */
+    public Observable<Void> sync() {
+        return Observable.defer(new Func0<Observable<Void>>() {
+            @Override
+            public Observable<Void> call() {
+                Drive.DriveApi.requestSync(mClient).await();
+                return Observable.just(null);
+            }
+        }).subscribeOn(Schedulers.io());
+    }
 
     /**
      * Returns the Metadata of a DriveResource