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package cgeo.geocaching;
import cgeo.geocaching.compatibility.Compatibility;
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 cgDirection {
private final Context context;
private final SensorManager sensorManager;
private final SensorListener sensorListener;
private UpdateDirectionCallback updateDirectionCallback = null;
public Float directionNow = null;
public cgDirection(Context contextIn, UpdateDirectionCallback callback) {
context = contextIn;
updateDirectionCallback = callback;
sensorListener = new SensorListener();
sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
sensorManager.registerListener(sensorListener, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_NORMAL);
}
public void closeDir() {
if (sensorManager != null && sensorListener != null) {
sensorManager.unregisterListener(sensorListener);
}
}
public void replaceUpdate(UpdateDirectionCallback callback) {
updateDirectionCallback = callback;
fireDirectionCallback();
}
private void fireDirectionCallback() {
if (updateDirectionCallback != null && directionNow != null) {
updateDirectionCallback.updateDirection(this);
}
}
private final class SensorListener implements SensorEventListener {
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
/*
* There is a bug in Android, which appearently 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(SensorEvent event) {
directionNow = Compatibility.getDirectionNow(event.values[0], (Activity) context);
fireDirectionCallback();
}
}
}
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