Android蓝牙LE扫描：两种扫描方法的稳定性对比咨询

Hey fellow dev! Let's dive into the stability differences between these two BLE scanning methods since you're dealing with device service scanning and ran into ScanFilter quirks.

Key Stability Breakdown #

• Old Method: BluetoothAdapter.startLEScan()

  • First off, this API was deprecated in API 21, which means Google has stopped actively maintaining it. On newer Android versions (especially Android 10+), you'll notice more inconsistencies:
    • It lacks native support for proper scan filtering—you have to handle all filtering logic in your callback, which can lead to unnecessary processing power usage and potential scan lag or missed devices.
    • System-level scan optimizations (like dynamic scan window adjustments) don't apply to this method, so you're more likely to encounter missed BLE advertisements or inconsistent scan results.
    • Permission handling gets trickier on newer OS versions; the method might silently fail if you don't have the exact right permissions, with fewer helpful error logs to debug.

• New Method: BluetoothLEScanner.startScan(...)

  • This was introduced in API 21 specifically to replace the old startLEScan(), and it's the official recommended way for BLE scanning now.
  • Even though you've hit some issues with ScanFilter, the overall stability is way better:
    • System-level optimizations are built into this method—Android handles scan scheduling more efficiently, reducing both battery drain and the chance of missing devices.
    • It plays nicer with modern permission models (like ACCESS_FINE_LOCATION or BLUETOOTH_SCAN in Android 12+), with clearer error states if something goes wrong.
    • If ScanFilter isn't working perfectly for your use case, you can always fall back to filtering results in the callback, but the native filtering still reduces the load on your app compared to the old method.
    • Google continues to patch bugs and improve this API in newer Android releases, so you'll get better long-term compatibility.

Final Takeaway #

If your app targets API 21 or higher (which most do these days), BluetoothLEScanner.startScan(...) is far more stable than the deprecated startLEScan(). The ScanFilter issues are manageable with workarounds, but the old method's lack of maintenance and poor compatibility with modern Android make it a risky choice for reliable BLE scanning.

内容的提问来源于stack exchange，提问作者Mike