/**
* Enable receiving orientation updates from the provided IOrientationProvider and show a compass
* on the map. You will likely want to call enableCompass() from your Activity's
* Activity.onResume() method, to enable the features of this overlay. Remember to call the
* corresponding disableCompass() in your Activity's Activity.onPause() method to turn off updates
* when in the background.
*/
public boolean enableCompass() {
boolean result = true;
if (mIsCompassEnabled) mOrientationProvider.stopOrientationProvider();
result = mOrientationProvider.startOrientationProvider(this);
mIsCompassEnabled = result;
// Update the screen to see changes take effect
if (mMapView != null) {
this.invalidateCompass();
}
return result;
}
protected void setOrientationProvider(IOrientationProvider orientationProvider) {
if (orientationProvider == null)
throw new RuntimeException(
"You must pass an IOrientationProvider to setOrientationProvider()");
if (mOrientationProvider != null) mOrientationProvider.stopOrientationProvider();
mOrientationProvider = orientationProvider;
}
/** Disable orientation updates */
public void disableCompass() {
mIsCompassEnabled = false;
if (mOrientationProvider != null) {
mOrientationProvider.stopOrientationProvider();
}
// Reset values
mAzimuth = Float.NaN;
// Update the screen to see changes take effect
if (mMapView != null) {
this.invalidateCompass();
}
}