Native Applications ISE Practice Questions (Page 4)

Questions 16–20

1. 16application · medium

   A team is developing a native Android app for a smart agriculture system that reads soil moisture sensors over LoRaWAN via a gateway. The app currently polls the gateway's REST API every 5 seconds, causing high battery drain and network congestion. Which optimization technique would be most effective?

   • AUse a hybrid web app to handle the polling in JavaScript to reduce native code overhead.
   • BSwitch to a push-based notification mechanism (e.g., MQTT or Firebase Cloud Messaging) to receive updates only when sensor data changes.
   • CIncrease the polling interval to 60 seconds to reduce network usage.
   • DCompress the REST API responses using gzip to reduce data transfer.
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2. 17application · medium

   A medical device manufacturer is developing a native Android app that communicates with a wearable glucose monitor over Bluetooth. The app must process sensor data every second and display it with minimal delay. The development team is deciding how to structure the app to avoid UI jank and ensure timely data processing. Which approach is the most appropriate?

   • APerform all Bluetooth reads and data processing directly in the main activity's onResume method to minimize context switching.
   • BUse a hybrid web framework to handle Bluetooth communication through a JavaScript bridge for faster development.
   • CPoll the Bluetooth adapter every 10 seconds to reduce battery usage and then batch-process the data.
   • DRun the Bluetooth data collection and processing in a foreground service with a dedicated thread, and update the UI via a ViewModel.
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4. 18application · medium

   A logistics company uses a native Android app on handheld scanners to track packages. The scanners communicate with a backend via a REST API over Wi-Fi. The company is adding support for offline operation in warehouses with poor connectivity. The app must queue package scans locally and synchronize when connectivity returns. Which design should the app use?

   • ASend scans via SMS as a fallback when Wi-Fi is unavailable.
   • BCache scans in memory and retry the REST call every few seconds until it succeeds.
   • CUse a local SQLite database to store scans and a background sync service that pushes queued data when the network is available.
   • DUse a web-based interface that the scanner loads from the backend each time.
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5. 19foundation · easy

   Which tool is commonly used for debugging native Android applications?

   • AAndroid Studio Debugger
   • BWireshark
   • CChrome DevTools
   • DXcode Instruments
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6. 20foundation · easy

   Which architectural component in a native IoT application is typically responsible for managing local data persistence, such as storing sensor readings on the device?

   • AThe presentation layer
   • BThe middleware layer
   • CThe data layer
   • DThe security layer
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