扫描专用BLE器件的问题
我是工作的BLE和必须扫描的BLE设备与特定的udid。
目前，所有BLE支持的设备都是扫描结果。
为了避免和只扫描特定的设备，我所做的如下：
fun startScanDevices(interval: Long = Constants.DEFAULT_SCAN_TIME_OUT,
connectedDevices: HashMap<String, BLEDeviceModel>? = null,
scanWithId: String? = null, context: Activity? = null) {
this.context = context
if (scanWithId != null)
this.scanWithId = scanWithId
if (isBluetoothEnabled) {
clearDeviceList(connectedDevices)
val BLP_SERVICE_UUID = UUID.fromString(UUID_OF_DEVICE)
val serviceUUIDs = arrayOf<UUID>(BLP_SERVICE_UUID)
var filters: MutableList<ScanFilter?>? = null
if (serviceUUIDs != null) {
filters = ArrayList()
for (serviceUUID in serviceUUIDs) {
val filter: ScanFilter = ScanFilter.Builder()
.setServiceUuid(ParcelUuid(serviceUUID))
.build()
filters!!.add(filter)
}
}
val scanSettings: ScanSettings = ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_POWER)
.setCallbackType(ScanSettings.CALLBACK_TYPE_ALL_MATCHES)
.setMatchMode(ScanSettings.MATCH_MODE_AGGRESSIVE)
.setNumOfMatches(ScanSettings.MATCH_NUM_ONE_ADVERTISEMENT)
.setReportDelay(1L)
.build()
mBluetoothAdapter?.bluetoothLeScanner?.startScan(filters,scanSettings,scanCallback)
mScanning = true
handler.postDelayed(stopScanningRunnable, interval)
}
}现在，在上面的方法中，您可以验证我将filters和scanSettings作为startScan方法的参数传递。
但是，有了这两个论点，我得出了以下错误：
2021-05-06 11:16:24.295 14669-14669/？E/AndroidRuntime:致命异常:主进程: com.dev，PID: 14669 java.lang.IndexOutOfBoundsException:索引: 0尺寸: com.ble.BLEManager$scanCallback$1.onBatchScanResults(BLEManager.kt:153)，android.bluetooth.le.BluetoothLeScanner$BleScanCallbackWrapper$2.run(BluetoothLeScanner.java:627)，android.os.Handler.handleCallback(Handler.java:938)，android.os.Handler.dispatchMessage(Handler.java:99)，android.os.Looper.loop(Looper.java:246)，java.lang.reflect.Method.invoke，android.app.ActivityThread.main(ActivityThread.java:8506)，java.util.ArrayList.get(ArrayList.java:437)(原生方法)在com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
startScan()中的单个参数运行良好，如下所示--没有得到此错误：
mBluetoothAdapter?.bluetoothLeScanner?.startScan(scanCallback)因此，错误出现在以下方法中：
override fun onBatchScanResults(results: List<ScanResult>) {
results[0].device
super.onBatchScanResults(results)
}编辑
删除了这个名为：onBatchScanResults的不必要方法，因为我使用的是onScanResult.
现在，错误不会出现，但是不能用过滤器和scanSettings扫描任何设备。
可能会有什么问题？请指点。谢谢。
回答 1
Stack Overflow用户
发布于 2021-05-14 08:23:01
步骤1)添加过滤器如下：
String[] filterNames = intent.getStringArrayExtra(FILTER_NAME_LIST)；
String[] filterMacs = intent.getStringArrayExtra(FILTER_MAC_LIST)；
String[] ignoreMacs = intent.getStringArrayExtra(IGNORE_MAC_LIST)；
mFilter =新ScanServiceFilter.Builder() .filterNames(filterNames) .filterMacs(filterMacs) .ignoreMacs(ignoreMacs) .build()；
步骤2:调用scanLeDevice()
scanLeDevice(真)；
步骤3: scanLeDevice创建设置
ScanSettings settings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
.setCallbackType(CALLBACK_TYPE_ALL_MATCHES)
.setMatchMode(MATCH_MODE_AGGRESSIVE)
.setNumOfMatches(MATCH_NUM_FEW_ADVERTISEMENT)
.setReportDelay(0)
.build();
// We only want to scan for devices advertising our custom service
ScanFilter scanFilter = new ScanFilter.Builder()
.setServiceUuid(new ParcelUuid(UUIDConstants.RX_SERVICE_UUID)).build();
if (mBluetoothLeScanner != null && mBluetoothAdapter.getState() == BluetoothAdapter.STATE_ON) {
mBluetoothLeScanner.startScan(Collections.singletonList(scanFilter), settings, mScanCallback);
broadcastAction(new ScanBleActionEvent(ScanBleActionEvent.Actions.SCAN_STARTED));
} else {
bluetoothDeviceStopped();
}步骤4: on ScanCallback检查
if (mFilter.passesFilter(scanDevice)) {
filteredResults.add(scanDevice);
broadcastAction(new ScanBleActionEvent(ScanBleActionEvent.Actions.SCANNED_DEVICE, scanDevice));
}https://stackoverflow.com/questions/67412584
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