文件写完后立即要求系统刷新缓存

app/src/main/cpp/PhoneDevice.cpp

@@ -462,6 +462,7 @@ void CPhoneDevice::CJpegCamera::onImageAvailable(AImageReader* reader)
         if (file && data && len)
         {
             fwrite(data, 1, len, file);
+            fdatasync(fileno(file));
             fclose(file);
         }
         else

app/src/main/cpp/netcamera/httpclient.cpp

@@ -198,6 +198,7 @@ bool requestCapture(uint8_t channel, uint8_t preset, const NET_PHOTO_INFO& photo
             if (fp != NULL)
             {
                 fwrite(&data[0], data.size(), 1, fp);
+                fdatasync(fileno(fp));
                 fclose(fp);
                 res = true;
             }