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我正在尝试创建并绘制从当前设备位置到定义目的地的路线。当我在平板电脑上测试应用程序时,它运行良好。但是当我在智能手机上测试它时,它崩溃了。这是我写的代码:

                    public class RoutePath extends MapActivity {
                        /** Called when the activity is first created. */
                        MapView mapView;
                        private RoutePath _activity;
                        GeoPoint srcGeoPoint,destGeoPoint;
                        private static List<Overlay> mOverlays;
                        MapController mc;
                        Location location;
                        private MyLocationOverlay myLocationOverlay;
                        String n;
                        double longitude;
                        double latitude;


                        @Override
                        public void onCreate(Bundle savedInstanceState) {
                            super.onCreate(savedInstanceState);

                            ActionBar bar = getActionBar();
                            bar.setBackgroundDrawable(getResources().getDrawable(R.drawable.actionbar));

                            SharedData data = SharedData.getInstance();
                            mapView = new MapView(this,"***MAP KEY*****");
                            mapView.setClickable(true); 




                            setContentView(mapView);
                            _activity = this;
                            LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
                            Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);//work with network
                            longitude = location.getLongitude();
                            latitude = location.getLatitude();

                            double src_lat = latitude;
                            double src_long = longitude;
                            double dest_lat = 38.1267303;
                            double dest_long = 13.3466097;

                           String n = String.valueOf(src_long);
                           Log.d("asd",n);

                            if(src_lat == -1 || src_long == -1 || dest_lat == -1 || dest_long == -1){
                                showAlert("Please enter source and destination points");
                            }else{

                                srcGeoPoint = new GeoPoint((int) (src_lat * 1E6),(int) (src_long * 1E6));
                                destGeoPoint = new GeoPoint((int) (dest_lat * 1E6),(int) (dest_long * 1E6));

                                List<Overlay> mapOverlays = mapView.getOverlays();
                                Drawable srcdrawable = this.getResources().getDrawable(R.drawable.pushpin1);
                                CustomItemizedOverlay srcitemizedOverlay = new CustomItemizedOverlay(srcdrawable);
                                //CustomItemizedOverlay srcitemizedOverlay = new CustomItemizedOverlay(getDrawable("com/agarwal/route/pin_green.png"));
                                OverlayItem srcoverlayitem = new OverlayItem(srcGeoPoint, "Hello!", "This is your Location.");

                                Drawable destdrawable = this.getResources().getDrawable(R.drawable.pushpin1);
                                CustomItemizedOverlay  destitemizedOverlay = new CustomItemizedOverlay( destdrawable );
                               // CustomItemizedOverlay destitemizedOverlay = new CustomItemizedOverlay(getDrawable("com/agarwal/route/pin_red.png"));
                                OverlayItem destoverlayitem = new OverlayItem(destGeoPoint, "Hello!", "This is dest Location.");

                                srcitemizedOverlay.addOverlay(srcoverlayitem);
                                destitemizedOverlay.addOverlay(destoverlayitem);

                                mapOverlays.add(srcitemizedOverlay);
                                mapOverlays.add(destitemizedOverlay);

                                connectAsyncTask _connectAsyncTask = new connectAsyncTask();
                                _connectAsyncTask.execute();       
                                mapView.setBuiltInZoomControls(true);
                                mapView.displayZoomControls(true);
                                mOverlays = mapView.getOverlays();
                                mapView.getController().animateTo(srcGeoPoint);
                                mapView.getController().setZoom(12);
                            }
                        }
                        @Override
                        protected boolean isRouteDisplayed() {
                            // TODO Auto-generated method stub
                            return false;
                        }
                        //era private prima di 
                       private class connectAsyncTask extends AsyncTask<Void, Void, Void>{
                            private ProgressDialog progressDialog;
                            @Override
                            protected void onPreExecute() {
                                // TODO Auto-generated method stub
                                super.onPreExecute();

                                progressDialog = new ProgressDialog(_activity);
                                progressDialog.setMessage("Caricamento del percorso...");
                                progressDialog.setIndeterminate(true);
                                progressDialog.show();
                            }
                            @Override
                            protected Void doInBackground(Void... params) {
                                // TODO Auto-generated method stub
                                fetchData();

                                return null;
                            }
                            @Override
                            protected void onPostExecute(Void result) {
                                // TODO Auto-generated method stub
                                super.onPostExecute(result);           
                                if(doc!=null){
                                    Overlay ol = new MyOverlay(_activity,srcGeoPoint,srcGeoPoint,1);
                                    mOverlays.add(ol);
                                    NodeList _nodelist = doc.getElementsByTagName("status");
                                    Node node1 = _nodelist.item(0);
                                    String _status1  = node1.getChildNodes().item(0).getNodeValue();
                                    if(_status1.equalsIgnoreCase("OK")){
                                        NodeList _nodelist_path = doc.getElementsByTagName("overview_polyline");
                                        Node node_path = _nodelist_path.item(0);
                                        Element _status_path = (Element)node_path;
                                        NodeList _nodelist_destination_path = _status_path.getElementsByTagName("points");
                                        Node _nodelist_dest = _nodelist_destination_path.item(0);
                                        String _path  = _nodelist_dest.getChildNodes().item(0).getNodeValue();
                                        List<GeoPoint> _geopoints = decodePoly(_path);
                                        GeoPoint gp1;
                                        GeoPoint gp2;
                                        gp2 = _geopoints.get(0);
                                        Log.d("_geopoints","::"+_geopoints.size());
                                        for(int i=1;i<_geopoints.size();i++) // the last one would be crash
                                        {

                                            gp1 = gp2;
                                            gp2 = _geopoints.get(i);
                                            Overlay ol1 = new MyOverlay(gp1,gp2,2,Color.BLUE);
                                            mOverlays.add(ol1);
                                        }
                                        Overlay ol2 = new MyOverlay(_activity,destGeoPoint,destGeoPoint,3);
                                        mOverlays.add(ol2);

                                        progressDialog.dismiss();
                                    }else{
                                        showAlert("Unable to find the route");
                                    }

                                    Overlay ol2 = new MyOverlay(_activity,destGeoPoint,destGeoPoint,3);
                                    mOverlays.add(ol2);
                                    progressDialog.dismiss();
                                    mapView.scrollBy(-1,-1);
                                    mapView.scrollBy(1,1);
                                }else{
                                    showAlert("Unable to find the route");
                                }

                            }

                        } //end Async
                        Document doc = null;
                        private void fetchData()
                        {

                            StringBuilder urlString = new StringBuilder();
                            urlString.append("http://maps.google.com/maps/api/directions/xml?origin=");
                            urlString.append( Double.toString((double)srcGeoPoint.getLatitudeE6()/1.0E6 ));
                            urlString.append(",");
                            urlString.append( Double.toString((double)srcGeoPoint.getLongitudeE6()/1.0E6 ));
                            urlString.append("&destination=");//to
                            urlString.append( Double.toString((double)destGeoPoint.getLatitudeE6()/1.0E6 ));
                            urlString.append(",");
                            urlString.append( Double.toString((double)destGeoPoint.getLongitudeE6()/1.0E6 ));
                            urlString.append("&sensor=true&mode=driving");    
                            Log.d("url","::"+urlString.toString());
                            HttpURLConnection urlConnection= null;
                            URL url = null;
                            try
                            {
                                url = new URL(urlString.toString());
                                urlConnection=(HttpURLConnection)url.openConnection();
                                urlConnection.setRequestMethod("GET");
                                urlConnection.setDoOutput(true);
                                urlConnection.setDoInput(true);
                                urlConnection.connect();
                                DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
                                DocumentBuilder db = dbf.newDocumentBuilder();
                                doc = (Document) db.parse(urlConnection.getInputStream());//Util.XMLfromString(response);
                            }catch (MalformedURLException e){
                                e.printStackTrace();
                            }catch (IOException e){
                                e.printStackTrace();
                            }catch (ParserConfigurationException e){
                                e.printStackTrace();
                            }
                            catch (SAXException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                        }
                        private List<GeoPoint> decodePoly(String encoded) {

                            List<GeoPoint> poly = new ArrayList<GeoPoint>();
                            int index = 0, len = encoded.length();
                            int lat = 0, lng = 0;

                            while (index < len) {
                                int b, shift = 0, result = 0;
                                do {
                                    b = encoded.charAt(index++) - 63;
                                    result |= (b & 0x1f) << shift;
                                    shift += 5;
                                } while (b >= 0x20);
                                int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
                                lat += dlat;

                                shift = 0;
                                result = 0;
                                do {
                                    b = encoded.charAt(index++) - 63;
                                    result |= (b & 0x1f) << shift;
                                    shift += 5;
                                } while (b >= 0x20);
                                int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
                                lng += dlng;

                                GeoPoint p = new GeoPoint((int) (((double) lat / 1E5) * 1E6),
                                        (int) (((double) lng / 1E5) * 1E6));
                                poly.add(p);
                            }

                            return poly;
                        }
                        private void showAlert(String message){
                            AlertDialog.Builder alert = new AlertDialog.Builder(_activity);
                            alert.setTitle("Error");
                            alert.setCancelable(false);
                            alert.setMessage(message);
                            alert.setPositiveButton("Ok",new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int which) {
                                    // TODO Auto-generated method stub

                                }
                            });
                            alert.show();
                        }


                        private Drawable getDrawable(String fileName){
                            return Drawable.createFromStream(_activity.getClass().getClassLoader().getResourceAsStream(fileName), "pin");
                        }


                    }

我想问题可能是高 RAM 的使用,因为我试图在 1200 公里以外的两个地方之间创建一条路线,所以平板电脑的 RAM 可以承受这个过程,但不能承受智能手机。我用来测试的 Android 版本是 4.0.3,在平板电脑上比在智能手机上。有什么建议么?

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