draw a short path betweent 2 point in map - google-maps

Question

I'm doing app Google Map android.
I want draw a short path betweent 2 point in map.
But I don't know How do i need?
Please help me .Thank you very much.

Answer 1

new class util.java
public class Util {
private DataBaseHelper dbHelper;
private GeoFencApplicationDataset Dataset;
private int getId;
public static boolean checkConnection(Context mContext) {
NetworkInfo info = ((ConnectivityManager) mContext
.getSystemService(Context.CONNECTIVITY_SERVICE))
.getActiveNetworkInfo();
if (info == null || !info.isConnected()) {
return false;
}
if (info.isRoaming()) {
return true;
}
return true;
}
public void DrawPath(Context c, GeoPoint src, GeoPoint dest, int color,
MapView mMapView01) {
Dataset = (GeoFencApplicationDataset) c.getApplicationContext();
dbHelper = Dataset.getDbHelper();
StringBuilder urlString = new StringBuilder();
urlString.append("http://maps.google.com/maps?f=d&hl=en");
urlString.append("&saddr=");// from
urlString.append(Double.toString((double) src.getLatitudeE6() / 1.0E6));
urlString.append(",");
urlString
.append(Double.toString((double) src.getLongitudeE6() / 1.0E6));
urlString.append("&daddr=");// to
urlString
.append(Double.toString((double) dest.getLatitudeE6() / 1.0E6));
urlString.append(",");
urlString
.append(Double.toString((double) dest.getLongitudeE6() / 1.0E6));
urlString.append("&ie=UTF8&0&om=0&output=kml");
Log.d("xxx", "URL=" + urlString.toString());
Document doc = null;
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 = db.parse(urlConnection.getInputStream());
if (doc.getElementsByTagName("GeometryCollection").getLength() > 0) {
final String path = doc.getElementsByTagName("GeometryCollection")
.item(0).getFirstChild().getFirstChild()
.getFirstChild().getNodeValue();
final String[] pairs = path.split(" ");
String[] lngLat = pairs[0].split(",");
final GeoPoint startGP = new GeoPoint(
(int) (Double.parseDouble(lngLat[1]) * 1E6),
(int) (Double.parseDouble(lngLat[0]) * 1E6));
mMapView01.getOverlays().add(
new PathOverLay(startGP, startGP, 1));
GeoPoint gp1;
GeoPoint gp2 = startGP;
for (int i = 1; i < pairs.length; i++) {
lngLat = pairs[i].split(",");
gp1 = gp2;
gp2 = new GeoPoint(
(int) (Double.parseDouble(lngLat[1]) * 1E6),
(int) (Double.parseDouble(lngLat[0]) * 1E6));
mMapView01.getOverlays().add(
new PathOverLay(gp1, gp2, 2, color));
if (getId != 0) {
dbHelper.insertTempLatLong(lngLat[1], lngLat[0], getId);
}
Log.d("xxx", "pair:" + pairs[i]);
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
}
public double[] getLocation(Context c) {
Criteria criteria;
String provider;
LocationManager locManager = (LocationManager) c
.getSystemService(Context.LOCATION_SERVICE);
criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
provider = locManager.getBestProvider(criteria, true);
double[] loca = new double[2];
// For Latitude & Longitude
Location location = locManager.getLastKnownLocation(provider);
if (location != null) {
loca[0] = location.getLatitude();
loca[1] = location.getLongitude();
} else {
loca[0] = 0.0;
loca[1] = 0.0;
}
return loca;
}
public void setId(int id) {
// TODO Auto-generated method stub
getId = id;
}
}
new class PathOverLay.java
public class PathOverLay extends Overlay {
private GeoPoint gp1;
private GeoPoint gp2;
private int mRadius = 6;
private int mode = 0;
private int defaultColor;
private String text = "";
private Bitmap img = null;
public PathOverLay(GeoPoint gp1, GeoPoint gp2, int mode) // GeoPoint is a
// int. (6E)
{
this.gp1 = gp1;
this.gp2 = gp2;
this.mode = mode;
defaultColor = 999; // no defaultColor
}
public PathOverLay(GeoPoint gp1, GeoPoint gp2, int mode, int defaultColor) {
this.gp1 = gp1;
this.gp2 = gp2;
this.mode = mode;
this.defaultColor = defaultColor;
}
public void setText(String t) {
this.text = t;
}
public void setBitmap(Bitmap bitmap) {
this.img = bitmap;
}
public int getMode() {
return mode;
}
#Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
long when) {
Projection projection = mapView.getProjection();
if (shadow == false) {
Paint paint = new Paint();
paint.setAntiAlias(true);
Point point = new Point();
projection.toPixels(gp1, point);
// mode=1：start
if (mode == 1) {
if (defaultColor == 999)
paint.setColor(Color.BLUE);
else
paint.setColor(defaultColor);
// RectF oval = new RectF(point.x - mRadius, point.y - mRadius,
// point.x + mRadius, point.y + mRadius);
RectF oval = new RectF(point.x - mRadius, point.y - mRadius,
point.x + mRadius, point.y + mRadius);
// start point
canvas.drawOval(oval, paint);
}
// mode=2：path
else if (mode == 2) {
if (defaultColor == 999)
paint.setColor(Color.RED);
else
paint.setColor(defaultColor);
Point point2 = new Point();
projection.toPixels(gp2, point2);
paint.setStrokeWidth(5);
paint.setAlpha(70);
canvas.drawLine(point.x, point.y, point2.x, point2.y, paint);
}
/* mode=3：end */
else if (mode == 3) {
/* the last path */
if (defaultColor == 999)
paint.setColor(Color.GREEN);
else
paint.setColor(defaultColor);
Point point2 = new Point();
projection.toPixels(gp2, point2);
paint.setStrokeWidth(5);
paint.setAlpha(120);
canvas.drawLine(point.x, point.y, point2.x, point2.y, paint);
RectF oval = new RectF(point2.x - mRadius, point2.y - mRadius,
point2.x + mRadius, point2.y + mRadius);
/* end point */
paint.setAlpha(120);
canvas.drawOval(oval, paint);
}
}
return super.draw(canvas, mapView, shadow, when);
}
// Read more:
// http://csie-tw.blogspot.com/2009/06/android-driving-direction-route-path.html#ixzz1hte9kGoi
}
final call method ...
util = new Util();
mapOverlays = mapView.getOverlays();
util = new Util();
util.setId(id);
GeoPoint srcGeoPoint = new GeoPoint((int) (destLat * 1E6),
(int) (destLong * 1E6));
GeoPoint destGeoPoint = new GeoPoint((int) (srcLat * 1E6),
(int) (srcLong * 1E6));
progrDialog = ProgressDialog.show(AddFenceActivity.this,
"", "Please Wait..", true);
mapView.getOverlays().add(
new PathOverLay(srcGeoPoint,destGeoPoint, 2,Color.RED));
util.DrawPath(AddFenceActivity.this, srcGeoPoint,
destGeoPoint, Color.RED, mapView);
mapView.getController().animateTo(srcGeoPoint);
public class MapOverLayItem extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
Context mContext;
public MapOverLayItem(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
// TODO Auto-generated constructor stub
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
#Override
protected OverlayItem createItem(int i) {
// TODO Auto-generated method stub
return mOverlays.get(i);
}
#Override
public int size() {
// TODO Auto-generated method stub
return mOverlays.size();
}
public MapOverLayItem(Drawable defaultMarker, Context context) {
super(defaultMarker);
mContext = context;
}
}