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package cgeo.geocaching;
import cgeo.geocaching.compatibility.Compatibility;
import cgeo.geocaching.utils.MemorySubject;
import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
public class DirectionProvider extends MemorySubject<Float> implements SensorEventListener {
private final SensorManager sensorManager;
// Previous values signaled to observers to avoid re-sending the same value when the
// device doesn't change orientation. The orientation is usually given with a 1 degree
// precision by Android, so it is not uncommon to obtain exactly the same value several
// times.
private float previous = -1;
public DirectionProvider(final Context context) {
sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
}
@Override
protected void onFirstObserver() {
@SuppressWarnings("deprecation")
// This will be removed when using a new location service. Until then, it is okay to be used.
final Sensor defaultSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
sensorManager.registerListener(this, defaultSensor, SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onLastObserver() {
sensorManager.unregisterListener(this);
}
@Override
public void onAccuracyChanged(final Sensor sensor, 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. So logging
* this event leads to the log being flooded with multiple entries _per second_,
* which I experienced when running cgeo in a building (with GPS and network being
* unreliable).
*
* See for example https://code.google.com/p/android/issues/detail?id=14792
*/
//Log.i(Settings.tag, "Compass' accuracy is low (" + accuracy + ")");
}
@Override
public void onSensorChanged(final SensorEvent event) {
final float direction = event.values[0];
if (direction != previous) {
notifyObservers(direction);
previous = direction;
}
}
/**
* Take the phone rotation (through a given activity) in account and adjust the direction.
*
* @param activity the activity to consider when computing the rotation
* @param direction the unadjusted direction in degrees, in the [0, 360[ range
* @return the adjusted direction in degrees, in the [0, 360[ range
*/
public static float getDirectionNow(final Activity activity, final float direction) {
return Compatibility.getDirectionNow(direction, activity);
}
}
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