在进行BLE扫描过滤时,可以使用Android的BluetoothLeScanner类来实现。以下是一个示例代码,演示如何按服务数据UUID进行BLE扫描过滤:
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanCallback;
import android.bluetooth.le.ScanFilter;
import android.bluetooth.le.ScanResult;
import android.bluetooth.le.ScanSettings;
import android.os.Handler;
import android.os.ParcelUuid;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
public class BleScanner {
private BluetoothLeScanner mBluetoothLeScanner;
private ScanCallback mScanCallback;
private Handler mHandler;
public BleScanner() {
mHandler = new Handler();
}
public void startScan(UUID serviceUuid) {
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mBluetoothLeScanner = bluetoothAdapter.getBluetoothLeScanner();
ScanFilter scanFilter = new ScanFilter.Builder()
.setServiceUuid(new ParcelUuid(serviceUuid))
.build();
List filters = new ArrayList<>();
filters.add(scanFilter);
ScanSettings scanSettings = new ScanSettings.Builder()
.setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
.build();
mScanCallback = new ScanCallback() {
@Override
public void onScanResult(int callbackType, ScanResult result) {
super.onScanResult(callbackType, result);
BluetoothDevice device = result.getDevice();
// 处理发现的设备
}
@Override
public void onBatchScanResults(List results) {
super.onBatchScanResults(results);
// 处理批量扫描结果
}
@Override
public void onScanFailed(int errorCode) {
super.onScanFailed(errorCode);
// 处理扫描失败
}
};
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
mBluetoothLeScanner.stopScan(mScanCallback);
}
}, 10000); // 扫描10秒后自动停止
mBluetoothLeScanner.startScan(filters, scanSettings, mScanCallback);
}
public void stopScan() {
if (mBluetoothLeScanner != null && mScanCallback != null) {
mBluetoothLeScanner.stopScan(mScanCallback);
}
}
}
上述代码首先获取默认的蓝牙适配器和BluetoothLeScanner实例。然后,创建一个ScanFilter对象,通过setServiceUuid方法设置服务数据的UUID。接下来,创建一个ScanSettings对象,设置扫描模式为SCAN_MODE_LOW_LATENCY(低延迟模式)。然后,创建一个ScanCallback对象,重写其中的方法以处理扫描结果。最后,通过startScan方法启动BLE扫描,通过stopScan方法停止扫描。
使用时,可以实例化BleScanner类,并调用startScan方法开始扫描,传入要过滤的服务数据UUID。
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