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package cgeo.geocaching.sensors;
import cgeo.geocaching.CgeoApplication;
import cgeo.geocaching.utils.AngleUtils;
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;
import android.view.Surface;
import android.view.WindowManager;
public class DirectionProvider extends LooperCallbacks<Float> implements SensorEventListener {
private static final WindowManager WINDOW_MANAGER = (WindowManager) CgeoApplication.getInstance().getSystemService(Context.WINDOW_SERVICE);
private final SensorManager sensorManager;
private final Sensor orientationSensor;
@SuppressWarnings("deprecation")
protected DirectionProvider(final Context context) {
sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
orientationSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
}
@Override
public void onSensorChanged(final SensorEvent event) {
subscriber.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) {
sensorManager.registerListener(this, orientationSensor, SensorManager.SENSOR_DELAY_NORMAL);
}
}
@Override
public void onStop() {
if (orientationSensor != null) {
sensorManager.unregisterListener(this);
}
}
public static Observable<Float> create(final Context context) {
return Observable.create(new DirectionProvider(context));
}
/**
* Take the phone rotation (through a given activity) in account and adjust the direction.
*
* @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 float direction) {
return AngleUtils.normalize(direction + getRotationOffset());
}
static float reverseDirectionNow(final float direction) {
return AngleUtils.normalize(direction - getRotationOffset());
}
private static int getRotationOffset() {
switch (WINDOW_MANAGER.getDefaultDisplay().getRotation()) {
case Surface.ROTATION_90:
return 90;
case Surface.ROTATION_180:
return 180;
case Surface.ROTATION_270:
return 270;
default:
return 0;
}
}
}
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