在Android 8.1.0中关闭移动屏幕时,BLE扫描停止 [英] BLE Scan Stop when Mobile Screen off in android 8.1.0
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问题描述
我将此权限放在清单文件中.
I put this permission in manifest file.
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
这是开始扫描方法.屏幕打开时,扫描正常.但是,当屏幕关闭时,扫描将停止,并在屏幕再次打开时恢复扫描. 我尝试了
This is a Start scan method. When Screen is on scanning works fine. But when Screen goes to off, scanning stops and resume back when screen is on again. I tried this solution but still facing the same issue.
void startScan() {
if (!mScanning) {
final BluetoothLeScannerCompat scanner = BluetoothLeScannerCompat.getScanner();
final ScanSettings settings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY).setReportDelay(0).setUseHardwareBatchingIfSupported(false).setUseHardwareFilteringIfSupported(false).build();
ScanFilter.Builder builder = new ScanFilter.Builder();
builder.setServiceUuid(new ParcelUuid(THINGY_BASE_UUID));
ScanFilter filter = builder.build();
final List<ScanFilter> filters = new ArrayList<>();
filters.add(filter); // Add Filter using UUID
scanner.startScan(filters, settings, scanCallback);
mScanning = true;
}
}
这是获取扫描结果的回调方法.
This is call back method for getting scan result.
private ScanCallback scanCallback = new ScanCallback() {
@Override
public void onScanResult(final int callbackType, final ScanResult result) {
// do nothing
Log.e("MainActivity", "onScanResult: " + result.getDevice().getName());
}
@Override
public void onBatchScanResults(final List<ScanResult> results) {
Log.e("MainActivity", "onBatchScanResults: " + results.size());
}
@Override
public void onScanFailed(final int errorCode) {
// should never be called
}
};
推荐答案
如果您使用的是nordic scanning library
,请尝试以下操作:
If you are using nordic scanning library
try this:
private void scan(){
scanner = BluetoothLeScannerCompat.getScanner();
ScanSettings settings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY).setReportDelay(10)
.setCallbackType(DEFAULT_KEYS_SEARCH_GLOBAL)
.setUseHardwareBatchingIfSupported(false).build();
List<ScanFilter> filters = new ArrayList<>();
scanner.startScan(filters, settings, mScanCallback);
}
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