/** @hide */
@Override
protected boolean registerListenerImpl(
SensorEventListener listener, Sensor sensor, int delay, Handler handler) {
boolean result = true;
synchronized (sListeners) {
// look for this listener in our list
ListenerDelegate l = null;
for (ListenerDelegate i : sListeners) {
if (i.getListener() == listener) {
l = i;
break;
}
}
// if we don't find it, add it to the list
if (l == null) {
l = new ListenerDelegate(listener, sensor, handler);
sListeners.add(l);
// if the list is not empty, start our main thread
if (!sListeners.isEmpty()) {
if (sSensorThread.startLocked()) {
if (!enableSensorLocked(sensor, delay)) {
// oops. there was an error
sListeners.remove(l);
result = false;
}
} else {
// there was an error, remove the listener
sListeners.remove(l);
result = false;
}
} else {
// weird, we couldn't add the listener
result = false;
}
} else if (!l.hasSensor(sensor)) {
l.addSensor(sensor);
if (!enableSensorLocked(sensor, delay)) {
// oops. there was an error
l.removeSensor(sensor);
result = false;
}
}
}
return result;
}
/** @hide */
@Override
protected void unregisterListenerImpl(SensorEventListener listener, Sensor sensor) {
synchronized (sListeners) {
final int size = sListeners.size();
for (int i = 0; i < size; i++) {
ListenerDelegate l = sListeners.get(i);
if (l.getListener() == listener) {
if (sensor == null) {
sListeners.remove(i);
// disable all sensors for this listener
for (Sensor s : l.getSensors()) {
disableSensorLocked(s);
}
} else if (l.removeSensor(sensor) == 0) {
// if we have no more sensors enabled on this listener,
// take it off the list.
sListeners.remove(i);
disableSensorLocked(sensor);
}
break;
}
}
}
}
