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我见过很多关于如何将有限事物(如数组或Iterable
s)转换为Observable
的示例,但我不确定如何使Observable
脱离活动并且有效像事件接收者一样无限。我研究了RxJava2文档,并提出了这个问题,以Android LocationListener
为例。Observables中包装事件监听器
有没有更简单和/或更正确的方法来做到这一点?我知道“RxBus”概念,但它似乎是一种坚持旧事件总线范例的方式。
final Observable<Location> locationObservable = Observable.create(new ObservableOnSubscribe<Location>() {
final LocationManager mLocationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
@Override
public void subscribe(final ObservableEmitter<Location> emitter) throws Exception {
final LocationListener listener = new LocationListener() {
@Override
public void onLocationChanged(final Location location) {
emitter.onNext(location);
}
@Override
public void onStatusChanged(final String s, final int i, final Bundle bundle) {
// TODO ???
}
@Override
public void onProviderEnabled(final String s) {
// TODO ???
}
@Override
public void onProviderDisabled(final String s) {
// TODO ???
}
};
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listener);
emitter.setCancellable(new Cancellable() {
@Override
public void cancel() throws Exception {
mLocationManager.removeUpdates(listener);
}
});
emitter.setDisposable(new Disposable() {
private AtomicBoolean mDisposed;
@Override
public void dispose() {
if(mDisposed.compareAndSet(false, true)) {
mLocationManager.removeUpdates(listener);
}
}
@Override
public boolean isDisposed() {
return mDisposed.get();
}
});
}
});