import no.nordicsemi.android.support.v18.scanner.ScanFilter; //导入依赖的package包/类
private void startLeScan() {
    mScanning = true;

    ScanSettings settings = new ScanSettings.Builder()
            .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
            .setReportDelay(1000)
            .build();
    List<ScanFilter> filters = new ArrayList<>();
    filters.add(new ScanFilter.Builder().setServiceUuid(new ParcelUuid(SERVICE_UUID)).build());
    mScanner.startScan(filters, settings, mScanCallback);

    // Stops scanning after a pre-defined scan period.
    mStopScanHandler.postDelayed(mStopScanRunnable, SCAN_TIMEOUT_MS);

    invalidateOptionsMenu();
}
 

import no.nordicsemi.android.support.v18.scanner.ScanFilter; //导入依赖的package包/类
/**
 * Start scanning for Bluetooth devices.
 */
public void startScan() {
	if (mScannerLiveData.isScanning()) {
		return;
	}

	// Scanning settings
	final ScanSettings settings = new ScanSettings.Builder()
			.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
			// Refresh the devices list every second
			.setReportDelay(0)
			// Hardware filtering has some issues on selected devices
			.setUseHardwareFilteringIfSupported(false)
			// Samsung S6 and S6 Edge report equal value of RSSI for all devices. In this app we ignore the RSSI.
				/*.setUseHardwareBatchingIfSupported(false)*/
			.build();

	// Let's use the filter to scan only for Blinky devices
	final ParcelUuid uuid = new ParcelUuid(BlinkyManager.LBS_UUID_SERVICE);
	final List<ScanFilter> filters = new ArrayList<>();
	filters.add(new ScanFilter.Builder().setServiceUuid(uuid).build());

	final BluetoothLeScannerCompat scanner = BluetoothLeScannerCompat.getScanner();
	scanner.startScan(filters, settings, scanCallback);
	mScannerLiveData.scanningStarted();
}
 

import no.nordicsemi.android.support.v18.scanner.ScanFilter; //导入依赖的package包/类
private void prepareForScan(){
    if(isBleSupported()) {
        final ParcelUuid uuid = NODE_CONFIGURATION_SERVICE;
        mScanFilterList = new ArrayList<>();
        mScanFilterList.add(new ScanFilter.Builder().setServiceUuid(uuid).build());
        mScanner = BluetoothLeScannerCompat.getScanner();

        if (checkIfVersionIsMarshmallowOrAbove()) {
            startLocationModeChangeReceiver();
            connectToGoogleApiClient();
        } else {
            if (!isBleEnabled()) {
                final Intent bluetoothEnable = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
                startActivityForResult(bluetoothEnable, REQUEST_ENABLE_BT);
            } else {
                startLeScan();
            }
        }
    } else {
        showError(getString(R.string.ble_not_supported), false);
    }
}
 

import no.nordicsemi.android.support.v18.scanner.ScanFilter; //导入依赖的package包/类
/**
 * Scan for 5 seconds and then stop scanning when a BluetoothLE device is found then mLEScanCallback is activated This will perform regular scan for custom BLE Service UUID and then filter out.
 * using class ScannerServiceParser
 */
private void startScan() {
	// Since Android 6.0 we need to obtain either Manifest.permission.ACCESS_COARSE_LOCATION or Manifest.permission.ACCESS_FINE_LOCATION to be able to scan for
	// Bluetooth LE devices. This is related to beacons as proximity devices.
	// On API older than Marshmallow the following code does nothing.
	if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
		// When user pressed Deny and still wants to use this functionality, show the rationale
		if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) && mPermissionRationale.getVisibility() == View.GONE) {
			mPermissionRationale.setVisibility(View.VISIBLE);
			return;
		}

		requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_PERMISSION_REQ_CODE);
		return;
	}

	// Hide the rationale message, we don't need it anymore.
	if (mPermissionRationale != null)
		mPermissionRationale.setVisibility(View.GONE);

	mAdapter.clearDevices();
	mScanButton.setText(R.string.scanner_action_cancel);

	final BluetoothLeScannerCompat scanner = BluetoothLeScannerCompat.getScanner();
	final ScanSettings settings = new ScanSettings.Builder()
			.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY).setReportDelay(1000).setUseHardwareBatchingIfSupported(false).build();
	final List<ScanFilter> filters = new ArrayList<>();
	filters.add(new ScanFilter.Builder().setServiceUuid(mUuid).build());
	scanner.startScan(filters, settings, scanCallback);

	mIsScanning = true;
	mHandler.postDelayed(new Runnable() {
		@Override
		public void run() {
			if (mIsScanning) {
				stopScan();
			}
		}
	}, SCAN_DURATION);
}
 

import no.nordicsemi.android.support.v18.scanner.ScanFilter; //导入依赖的package包/类
/**
 * Scan for 5 seconds and then stop scanning when a BluetoothLE device is found then mLEScanCallback is activated This will perform regular scan for custom BLE Service UUID and then filter out
 * using class ScannerServiceParser
 */
private void startScan() {
	// Since Android 6.0 we need to obtain either Manifest.permission.ACCESS_COARSE_LOCATION or Manifest.permission.ACCESS_FINE_LOCATION to be able to scan for
	// Bluetooth LE devices. This is related to beacons as proximity devices.
	// On API older than Marshmallow the following code does nothing.
	if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
		// When user pressed Deny and still wants to use this functionality, show the rationale
		if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) && mPermissionRationale.getVisibility() == View.GONE) {
			mPermissionRationale.setVisibility(View.VISIBLE);
			return;
		}

		requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_PERMISSION_REQ_CODE);
		return;
	}

	// Hide the rationale message, we don't need it anymore.
	if (mPermissionRationale != null)
		mPermissionRationale.setVisibility(View.GONE);

	mAdapter.clearDevices();
	mScanButton.setText(R.string.scanner_action_cancel);

	final BluetoothLeScannerCompat scanner = BluetoothLeScannerCompat.getScanner();
	final ScanSettings settings = new ScanSettings.Builder()
			.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY).setReportDelay(1000).setUseHardwareBatchingIfSupported(false).setUseHardwareFilteringIfSupported(false).build();
	final List<ScanFilter> filters = new ArrayList<>();
	filters.add(new ScanFilter.Builder().setServiceUuid(mUuid).build());
	scanner.startScan(filters, settings, scanCallback);

	mIsScanning = true;
	mHandler.postDelayed(new Runnable() {
		@Override
		public void run() {
			if (mIsScanning) {
				stopScan();
			}
		}
	}, SCAN_DURATION);
}
 

import no.nordicsemi.android.support.v18.scanner.ScanFilter; //导入依赖的package包/类
/**
 * Scan for 5 seconds and then stop scanning when a BluetoothLE device is found then mLEScanCallback is activated This will perform regular scan for custom BLE Service UUID and then filter out.
 * using class ScannerServiceParser
 */
private void startScan() {
	// Since Android 6.0 we need to obtain either Manifest.permission.ACCESS_COARSE_LOCATION or Manifest.permission.ACCESS_FINE_LOCATION to be able to scan for
	// Bluetooth LE devices. This is related to beacons as proximity devices.
	// On API older than Marshmallow the following code does nothing.
	if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
		// When user pressed Deny and still wants to use this functionality, show the rationale
		if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), Manifest.permission.ACCESS_COARSE_LOCATION) && mPermissionRationale.getVisibility() == View.GONE) {
			mPermissionRationale.setVisibility(View.VISIBLE);
			return;
		}

		requestPermissions(new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_PERMISSION_REQ_CODE);
		return;
	}

	// Hide the rationale message, we don't need it anymore.
	if (mPermissionRationale != null)
		mPermissionRationale.setVisibility(View.GONE);

	mAdapter.clearDevices();
	mScanButton.setText(R.string.scanner_action_cancel);

	final BluetoothLeScannerCompat scanner = BluetoothLeScannerCompat.getScanner();
	final ScanSettings settings = new ScanSettings.Builder()
			.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY).setReportDelay(1000).setUseHardwareBatchingIfSupported(false).build();
	final List<ScanFilter> filters = new ArrayList<>();
	filters.add(new ScanFilter.Builder().setServiceUuid(mUuid).build());
	scanner.startScan(filters, settings, scanCallback);

	mIsScanning = true;
	mHandler.postDelayed(() -> {
		if (mIsScanning) {
			stopScan();
		}
	}, SCAN_DURATION);
}