如果我评论应用程序启动onPause compass.disable并onResume compass.Enable运行，但我的谷歌地图上没有指南针。
另一方面，如果我取消注释这两行，应用程序甚至都不会显示。喜欢被阻止，然后我再次评论这两行并且模拟器再次工作。所以某个地方是指南针的问题，但我不知道在哪里，有任何帮助。
MapView map;
MyLocationOverlay compass;
MapController controller;
GeoPoint touchedPoint;
Drawable d;
List<Overlay> overlayList;
LocationManager lm;
String towers;
long start;
long stop;
int x, y;
int latit;
int longi;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_LEFT_ICON);// dodao za favicon
setContentView(R.layout.activity_main);
setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, R.drawable.logo);
map = (MapView) findViewById(R.id.mvMain);
map.setBuiltInZoomControls(true);
this.setTitle("EasyMaps=QRZ");
Touchy t = new Touchy();
overlayList = map.getOverlays();
overlayList.add(t);
compass = new MyLocationOverlay(MainActivity.this, map);
overlayList.add(compass);
controller = map.getController();
GeoPoint point = new GeoPoint((int) (47.975 * 1E6), (int) (17.056 * 1E6));
controller.animateTo(point);
controller.setZoom(17);
d = getResources().getDrawable(R.drawable.icon);
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria crit = new Criteria();
towers = lm.getBestProvider(crit, false);
Location location = lm.getLastKnownLocation(towers);
if (location != null) {
latit = (int) (location.getLatitude() * 1E6);
longi = (int) (location.getLongitude() * 1E6);
GeoPoint ourLocation = new GeoPoint(latit, longi);
OverlayItem overlayitem = new OverlayItem(ourLocation, "Location", "Location");
CustomPinpoint custom = new CustomPinpoint(d, MainActivity.this);
custom.insertPinpoint(overlayitem);
overlayList.add(custom);
} else {
Toast.makeText(MainActivity.this, "Provider not avaiable!", Toast.LENGTH_SHORT).show();
}
}
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Checks the orientation of the screen
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onResume() {
super.onResume();
compass.enableCompass();//Problem
lm.requestLocationUpdates(towers, 500, 1, this);
}
@Override
protected void onPause() {
super.onPause();
compass.disableCompass();//Problem
lm.removeUpdates(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
class Touchy extends Overlay {
public boolean onTouchEvent(MotionEvent e, MapView m) {
if (e.getAction() == MotionEvent.ACTION_DOWN) {
start = e.getEventTime();
x = (int) e.getX() + 11;
y = (int) e.getY() - 15;
touchedPoint = map.getProjection().fromPixels(x, y);
}
if (e.getAction() == MotionEvent.ACTION_UP) {
stop = e.getEventTime();
}
if (stop - start > 1500) {
// to do action
AlertDialog alert = new AlertDialog.Builder(MainActivity.this).create();
alert.setTitle("Option panel");
alert.setMessage("Choose an option!");
alert.setButton("Put flag", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
OverlayItem overlayitem = new OverlayItem(touchedPoint, "Flag", "Flag");
CustomPinpoint custom = new CustomPinpoint(d, MainActivity.this);
custom.insertPinpoint(overlayitem);
overlayList.add(custom);
}
});
alert.setButton2("Get address", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Geocoder geocoder = new Geocoder(getBaseContext(), Locale.getDefault());
try {
List<Address> address = geocoder.getFromLocation(touchedPoint.getLatitudeE6() / 1E6, touchedPoint.getLongitudeE6() / 1E6, 1);
if (address.size() > 0) {
String display = "";
for (int i = 0; i < address.get(0).getMaxAddressLineIndex(); i++) {
display += address.get(0).getAddressLine(i) + "\n";
}
Toast t3 = Toast.makeText(getBaseContext(), display, Toast.LENGTH_LONG);
t3.show();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
// Nista
}
}
});
alert.setButton3("View", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
if (map.isSatellite()) {
map.setSatellite(false);
map.setStreetView(true);
} else {
map.setStreetView(false);
map.setSatellite(true);
}
}
});
alert.show();
return true;
}
return false;
}
}
@Override
public void onLocationChanged(Location l) {
// TODO Auto-generated method stub
latit = (int) (l.getLatitude() * 1E6);
longi = (int) (l.getLongitude() * 1E6);
GeoPoint ourLocation = new GeoPoint(latit, longi);
OverlayItem overlayitem = new OverlayItem(ourLocation, "Location", "LOcation");
CustomPinpoint custom = new CustomPinpoint(d, MainActivity.this);
custom.insertPinpoint(overlayitem);
overlayList.add(custom);
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}