AltBeacon正在停止信标扫描。但继续扫描

Question

出现此问题后，总是进行扫描。
此问题将关闭设备上的蓝牙。或者退出应用程序就会解决。当我让程序运行12小时时，出现了此问题。
似乎很少出现此问题，但我不知道是什么引发了此问题。
有人能帮助我解决此问题吗？
下面列出了终端信息、源代码和日志。

箭头M03
Android OS 6.0
'org.altbeacon:Android-beacon-library:2.16.2'

主体活动

public class MainActivity extends AppCompatActivity implements BeaconConsumer {

private BeaconManager beaconManager;
Region mRegion;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    beaconManager = BeaconManager.getInstanceForApplication(this);
    beaconManager.getBeaconParsers().add(new BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));
    beaconManager.getBeaconParsers().remove(0);
    beaconManager.setForegroundBetweenScanPeriod(4000);

    mRegion = new Region("ibeacon", null, null, null);

    Button btnFore = (Button) findViewById(R.id.btnFore);
    btnFore.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            beaconManager.bind(MainActivity.this);
            beaconManager.setDebug(true);
        }
    });

    thdWriteLog l_thdWriteLog = new thdWriteLog();
    l_thdWriteLog.start();
}

@Override
public void onBeaconServiceConnect() {
    beaconManager.addMonitorNotifier(new MonitorNotifier() {
        @Override
        public void didEnterRegion(Region region) {}

        @Override
        public void didExitRegion(Region region) {}

        @Override
        public void didDetermineStateForRegion(int i, Region region) {}
    });

    try {
        beaconManager.startMonitoringBeaconsInRegion(mRegion);
    } catch (RemoteException e) {
        e.printStackTrace();
    }

    beaconManager.addRangeNotifier(new RangeNotifier() {
        @Override
        public void didRangeBeaconsInRegion(Collection<Beacon> beacons, Region region) {}
    });
}

public class thdWriteLog extends Thread {

@Override
public void run() {
    java.lang.Process proc = null;
    BufferedReader reader = null;
    PrintWriter writer = null;

    final String pId =  Integer.toString(android.os.Process.myPid());

    try {
        proc = Runtime.getRuntime().exec(new String[] { "logcat", "-v", "time"});
        reader = new BufferedReader(new InputStreamReader(proc.getInputStream()), 1024);
        String line;

        while ( true ) {

            line = reader.readLine();
            if (line.length() == 0) {
                try {
                    Thread.sleep(200);
                } catch (InterruptedException e) {
                }
                continue;
            }

            if (line.indexOf(pId) != -1) {

                try {
                    OutputStream out;
                    File l_file = new File(Environment.getExternalStorageDirectory().getPath() + "/log.text");

                    out = new FileOutputStream(l_file, true);
                    writer = new PrintWriter(new OutputStreamWriter(out,"UTF-8"));

                    String l_time = line.substring(0, 18);
                    String l_logType = line.substring(19, 21);
                    String l_logStr1 = line.substring(21, line.indexOf("):") + 2);
                    String l_logStr2 = line.substring(line.indexOf("):") + 3);
                    String l_logStr = l_time + ',' + l_logType + ',' + l_logStr1 + ',' + l_logStr2;

                    writer.println(l_logStr);
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    if (writer != null) {
                        writer.close();
                    }
                }
            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (reader != null) {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

Answer 1

在日志中显示的情况下，向底层Android API发出的停止扫描的命令失败了：

08:54:22.813 D/CycledLeScannerForLollipop(21211): Stopping LE scan on scan handler
08:54:22.814 D/BluetoothAdapter(21211): STATE_ON
08:54:22.814 D/BluetoothLeScanner(21211): could not find callback wrapper
08:54:23.430 E/ CycledLeScannerForLollipop(21211): Scan failed: app cannot be registered

上面最后一行写着“扫描失败”，这实际上是指试图停止扫描。

这肯定是测试设备上蓝牙堆栈内部的问题。由于Android bluetooth堆栈和底层bluetooth芯片之间的接口总是涉及到OEM的一些专有定制，这很可能是由于该实现中的一些bug造成的。