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package cgeo.geocaching.sensors;
import cgeo.geocaching.utils.Log;
import cgeo.geocaching.utils.RxUtils.LooperCallbacks;
import rx.Observable;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
public class OrientationProvider extends LooperCallbacks<Float> implements SensorEventListener {
private final SensorManager sensorManager;
private final Sensor orientationSensor;
@SuppressWarnings("deprecation")
protected OrientationProvider(final Context context) {
sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
orientationSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
if (orientationSensor != null) {
Log.d("OrientationProvider: sensor found");
} else {
Log.w("OrientationProvider: no orientation sensor on this device");
}
}
@SuppressWarnings("deprecation")
public static boolean hasOrientationSensor(final Context context) {
return ((SensorManager) context.getSystemService(Context.SENSOR_SERVICE)).getDefaultSensor(Sensor.TYPE_ORIENTATION) != null;
}
@Override
public void onSensorChanged(final SensorEvent event) {
subject.onNext(event.values[0]);
}
@Override
public void onAccuracyChanged(final Sensor sensor, final int accuracy) {
/*
* There is a bug in Android, which apparently causes this method to be called every
* time the sensor _value_ changed, even if the _accuracy_ did not change. Do not have any code in here.
*
* See for example https://code.google.com/p/android/issues/detail?id=14792
*/
}
@Override
public void onStart() {
if (orientationSensor != null) {
Log.d("OrientationProvider: starting the orientation provider");
sensorManager.registerListener(this, orientationSensor, SensorManager.SENSOR_DELAY_NORMAL);
} else {
subject.onError(new RuntimeException("orientation sensor is absent on this device"));
}
}
@Override
public void onStop() {
if (orientationSensor != null) {
Log.d("OrientationProvider: stopping the orientation provider");
sensorManager.unregisterListener(this);
}
}
public static Observable<Float> create(final Context context) {
return Observable.create(new OrientationProvider(context)).onBackpressureDrop();
}
}
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