У меня такая же проблема. Я проверил код Android.
Соответствующий код находится в SensorManager.java
private void unregisterListener(Object listener) {
if (listener == null) {
return;
}
synchronized (sListeners) {
final int size = sListeners.size();
for (int i=0 ; i<size ; i++) {
ListenerDelegate l = sListeners.get(i);
if (l.getListener() == listener) {
sListeners.remove(i);
// disable all sensors for this listener
for (Sensor sensor : l.getSensors()) {
disableSensorLocked(sensor);
}
break;
}
}
}
}
и
public void run() {
//Log.d(TAG, "entering main sensor thread");
final float[] values = new float[3];
final int[] status = new int[1];
final long timestamp[] = new long[1];
Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_DISPLAY);
if (!open()) {
return;
}
synchronized (this) {
// we've open the driver, we're ready to open the sensors
mSensorsReady = true;
this.notify();
}
while (true) {
// wait for an event
final int sensor = sensors_data_poll(sQueue, values, status, timestamp);
int accuracy = status[0];
synchronized (sListeners) {
if (sensor == -1 || sListeners.isEmpty()) {
// we lost the connection to the event stream. this happens
// when the last listener is removed or if there is an error
if (sensor == -1 && !sListeners.isEmpty()) {
// log a warning in case of abnormal termination
Log.e(TAG, "_sensors_data_poll() failed, we bail out: sensors=" + sensor);
}
// we have no more listeners or polling failed, terminate the thread
sensors_destroy_queue(sQueue);
sQueue = 0;
mThread = null;
break;
}
final Sensor sensorObject = sHandleToSensor.get(sensor);
if (sensorObject != null) {
// report the sensor event to all listeners that
// care about it.
final int size = sListeners.size();
for (int i=0 ; i<size ; i++) {
ListenerDelegate listener = sListeners.get(i);
if (listener.hasSensor(sensorObject)) {
// this is asynchronous (okay to call
// with sListeners lock held).
listener.onSensorChangedLocked(sensorObject,
values, timestamp, accuracy);
}
}
}
}
}
//Log.d(TAG, "exiting main sensor thread");
}
}
}
Похоже, что поток должен быть прерван, когда слушателей больше нет