我正在尝试在地图上显示多个引脚位置,即我的位置以及我从云端服务器获取的其他位置。
基于以下代码:
当我尝试将字符串标记化时,我不断收到NullPointer错误消息。这意味着我的CloudTask活动永远不会被解雇....我无法弄清楚为什么和Eclipse调试器不会逐步完成线程......任何帮助都会受到赞赏。
public class MapsActivity extends com.google.android.maps.MapActivity {
private static final String TAG = null;
private MapController mapController;
private MapView mapView;
private LocationManager locationManager;
private MyOverlays itemizedoverlay;
private MyLocationOverlay myLocationOverlay;
private MyLocationOverlay otherLocationOverlay;
private Handler handler;
private String message;
StringTokenizer tokens;
Integer p1 = null;
Integer p2;
GeoPoint point;
static Context mContext = null;
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.main); // bind the layout to the activity
// Configure the Map
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
mapView.setSatellite(true);
mapController = mapView.getController();
mapController.setZoom(14); // Zoon 1 is world view
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2500,
0,(LocationListener) new GeoUpdateHandler());
//new Intent("android.intent.action.LOCATION_CHANGED");
//(LocationListener) new GeoUpdateHandler());
myLocationOverlay = new MyLocationOverlay(this, mapView);
mapView.getOverlays().add(myLocationOverlay);
handler = new Handler();
// new AsyncTask<Void, Void, String>() {
myLocationOverlay.runOnFirstFix(new Runnable(){
public void run(){
MyRequestFactory requestFactory = Util.getRequestFactory(mContext,
MyRequestFactory.class);
final CloudTask1Request request = requestFactory.cloudTask1Request();
Log.i(TAG, "Sending request to server");
request.queryTasks().fire(new Receiver<List<TaskProxy>>() {
@Override
public void onSuccess(List<TaskProxy> taskList) {
//message = result;
message = "\n";
for (TaskProxy task : taskList) {
message += task.getId()+","+task.getNote()+",";
}
}
});
//return message;
//}
if(message.length() == 0){
Log.i("MESSAGE","Did not get any points from cloud");
}
tokens = new StringTokenizer(message,",");
tokens.nextToken();
p1 = Integer.parseInt(tokens.nextToken());
p2 = Integer.parseInt(tokens.nextToken());
point = new GeoPoint(p1,p2);
mapView.getController().animateTo(point);
}
});
Drawable drawable = this.getResources().getDrawable(R.drawable.pushpin);
itemizedoverlay = new MyOverlays(this, drawable);
createMarker();
myLocationOverlay.runOnFirstFix(new Runnable() {
public void run() {
mapView.getController().animateTo(
myLocationOverlay.getMyLocation());
}
});
//Drawable drawable = this.getResources().getDrawable(R.drawable.pushpin);
itemizedoverlay = new MyOverlays(this, drawable);
createMarker();
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
public class GeoUpdateHandler implements LocationListener {
@Override
public void onLocationChanged(Location location) {
int lat = (int) (location.getLatitude() * 1E6);
int lng = (int) (location.getLongitude() * 1E6);
GeoPoint point = new GeoPoint(lat, lng);
createMarker();
mapController.animateTo(point); // mapController.setCenter(point);
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}
private void createMarker() {
GeoPoint p = mapView.getMapCenter();
OverlayItem overlayitem = new OverlayItem(p, "", "");
itemizedoverlay.addOverlay(overlayitem);
if (itemizedoverlay.size() > 0) {
mapView.getOverlays().add(itemizedoverlay);
}
}
@Override
protected void onResume() {
super.onResume();
myLocationOverlay.enableMyLocation();
myLocationOverlay.enableCompass();
}
@Override
protected void onPause() {
super.onResume();
myLocationOverlay.disableMyLocation();
myLocationOverlay.disableCompass();
}
}
答案 0 :(得分:0)
将这些放在onSuccess()
中if(message.length() == 0){
Log.i("MESSAGE","Did not get any points from cloud");
}
tokens = new StringTokenizer(message,",");
tokens.nextToken();
p1 = Integer.parseInt(tokens.nextToken());
p2 = Integer.parseInt(tokens.nextToken());
point = new GeoPoint(p1,p2);
mapView.getController().animateTo(point);