我在我的应用中使用GoogleMapv2 api。我想从源到目标绘制一条多边形线。并显示旅行时间以及地图活动的距离，但我无法找到它。请帮我。 我的代码段在这里：
public class NavigationActivity extends FragmentActivity {
public static final String TAG_SLAT = "sourcelat";
public static final String TAG_SLONG = "sourcelong";
public static final String TAG_DLAT = "destinationlat";
public static final String TAG_DLONG = "destinationg";
private static LatLng Source = null;
private static LatLng Destination = null;
private GoogleMap map;
private SupportMapFragment fragment;
private LatLngBounds latlngBounds;
private Button bNavigation;
private Polyline newPolyline;
private Marker smarker;
private Marker dmarker;
private boolean isTraveling = false;
private int width, height;
private String sourcelat;
private String sourcelong;
private String destinationg;
private String destinationlat;
double slat;
double slong;
double dlat;
double dlong;
TextView tvDistanceDuration;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigation);
tvDistanceDuration = (TextView) findViewById(R.id.tv_distance_time);
Intent in = getIntent();
sourcelat = in.getStringExtra(TAG_SLAT);
destinationlat = in.getStringExtra(TAG_DLAT);
destinationg = in.getStringExtra(TAG_DLONG);
sourcelong = in.getStringExtra(TAG_SLONG);
slat=Double.parseDouble(sourcelat);
slong=Double.parseDouble(sourcelong);
dlat=Double.parseDouble(destinationlat);
dlong=Double.parseDouble(destinationg);
Source = new LatLng(slat,slong);
Destination = new LatLng(dlat,dlong);
getSreenDimanstions();
fragment = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map));
map = fragment.getMap();
if (!isTraveling) {
isTraveling = true;
findDirections(Source.latitude, Source.longitude, Destination.latitude, Destination.longitude, GMapV2Direction.MODE_DRIVING);
DecimalFormat df1 = new DecimalFormat("#.0000");
double dLat = Math.toRadians(dlat - slat);
double dLon = Math.toRadians(dlong - slong);
double a = Math.sin(dLat / 2) * Math.sin(dLat / 2)
+ Math.cos(Math.toRadians(slat))
* Math.cos(Math.toRadians(dlat)) * Math.sin(dLon / 2)
* Math.sin(dLon / 2);
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
double tempDistance = 6371 * c;
Log.v("sds...", String.valueOf(tempDistance));
} else {
isTraveling = false;
}
}
@Override
protected void onResume() {
super.onResume();
latlngBounds = createLatLngBoundsObject(Source, Destination);
map.moveCamera(CameraUpdateFactory.newLatLngBounds(latlngBounds, width, height, 150));
}
public void handleGetDirectionsResult(ArrayList<LatLng> directionPoints) {
PolylineOptions rectLine = new PolylineOptions().width(5).color(Color.RED);
MarkerOptions marker = new MarkerOptions().position(Source).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
MarkerOptions marker1 = new MarkerOptions().position(Destination).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
for(int i = 0 ; i < directionPoints.size() ; i++)
{
rectLine.add(directionPoints.get(i));
}
if (newPolyline != null)
{
newPolyline.remove();
}
newPolyline = map.addPolyline(rectLine);
smarker = map.addMarker(marker);
dmarker = map.addMarker(marker1);
if (isTraveling)
{
latlngBounds = createLatLngBoundsObject(Source, Destination);
map.animateCamera(CameraUpdateFactory.newLatLngBounds(latlngBounds, width, height, 150));
}
else
{
map.animateCamera(CameraUpdateFactory.newLatLngBounds(latlngBounds, width, height, 150));
}
}
private void getSreenDimanstions()
{
Display display = getWindowManager().getDefaultDisplay();
width = display.getWidth();
height = display.getHeight();
}
private LatLngBounds createLatLngBoundsObject(LatLng firstLocation, LatLng secondLocation)
{
if (firstLocation != null && secondLocation != null)
{
LatLngBounds.Builder builder = new LatLngBounds.Builder();
builder.include(firstLocation).include(secondLocation);
return builder.build();
}
return null;
}
public void findDirections(double fromPositionDoubleLat, double fromPositionDoubleLong, double toPositionDoubleLat, double toPositionDoubleLong, String mode)
{
Map<String, String> map = new HashMap<String, String>();
map.put(GetDirectionsAsyncTask.USER_CURRENT_LAT, String.valueOf(fromPositionDoubleLat));
map.put(GetDirectionsAsyncTask.USER_CURRENT_LONG, String.valueOf(fromPositionDoubleLong));
map.put(GetDirectionsAsyncTask.DESTINATION_LAT, String.valueOf(toPositionDoubleLat));
map.put(GetDirectionsAsyncTask.DESTINATION_LONG, String.valueOf(toPositionDoubleLong));
map.put(GetDirectionsAsyncTask.DIRECTIONS_MODE, mode);
GetDirectionsAsyncTask asyncTask = new GetDirectionsAsyncTask(this);
asyncTask.execute(map);
}
}
Asynctask类代码如下.........
public class GetDirectionsAsyncTask extends AsyncTask<Map<String, String>, Object, ArrayList<LatLng>>
{
public static final String USER_CURRENT_LAT = "user_current_lat";
public static final String USER_CURRENT_LONG = "user_current_long";
public static final String DESTINATION_LAT = "destination_lat";
public static final String DESTINATION_LONG = "destination_long";
public static final String DIRECTIONS_MODE = "directions_mode";
private NavigationActivity activity;
private Exception exception;
private ProgressDialog progressDialog;
public GetDirectionsAsyncTask(NavigationActivity activity)
{
super();
this.activity = activity;
}
public void onPreExecute()
{
progressDialog = new ProgressDialog(activity);
progressDialog.setMessage("Calculating directions");
progressDialog.show();
}
@Override
public void onPostExecute(ArrayList result)
{
progressDialog.dismiss();
if (exception == null)
{
activity.handleGetDirectionsResult(result);
}
else
{
processException();
}
}
@Override
protected ArrayList<LatLng> doInBackground(Map<String, String>... params)
{
Map<String, String> paramMap = params[0];
try
{
LatLng fromPosition = new LatLng(Double.valueOf(paramMap.get(USER_CURRENT_LAT)) , Double.valueOf(paramMap.get(USER_CURRENT_LONG)));
LatLng toPosition = new LatLng(Double.valueOf(paramMap.get(DESTINATION_LAT)) , Double.valueOf(paramMap.get(DESTINATION_LONG)));
GMapV2Direction md = new GMapV2Direction();
Document doc = md.getDocument(fromPosition, toPosition, paramMap.get(DIRECTIONS_MODE));
ArrayList<LatLng> directionPoints = md.getDirection(doc);
return directionPoints;
}
catch (Exception e)
{
exception = e;
return null;
}
}
private void processException()
{
Toast.makeText(activity, "Error retrieving data",Toast.LENGTH_SHORT).show();
}
}
和获取方向的课程如下：
public class GMapV2Direction {
public final static String MODE_DRIVING = "driving";
public final static String MODE_WALKING = "walking";
public GMapV2Direction() { }
public Document getDocument(LatLng start, LatLng end, String mode) {
String url = "http://maps.googleapis.com/maps/api/directions/xml?"
+ "origin=" + start.latitude + "," + start.longitude
+ "&destination=" + end.latitude + "," + end.longitude
+ "&sensor=false&units=metric&mode=driving";
try {
HttpClient httpClient = new DefaultHttpClient();
HttpContext localContext = new BasicHttpContext();
HttpPost httpPost = new HttpPost(url);
HttpResponse response = httpClient.execute(httpPost, localContext);
InputStream in = response.getEntity().getContent();
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.parse(in);
return doc;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public String getDurationText (Document doc) {
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "text"));
Log.i("DurationText", node2.getTextContent());
return node2.getTextContent();
}
public int getDurationValue (Document doc) {
NodeList nl1 = doc.getElementsByTagName("duration");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.i("DurationValue", node2.getTextContent());
return Integer.parseInt(node2.getTextContent());
}
public String getDistanceText(Document doc) {
NodeList nl1 = doc.getElementsByTagName("distance");
int i;
//get the last tag from XML
for(i = 0;i<nl1.getLength();i++){
}
if(i==i){
i--;
}
Node node1 = nl1.item(i);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "text"));
Log.i("DistanceText", node2.getTextContent());
return node2.getTextContent();
}
public int getDistanceValue (Document doc) {
NodeList nl1 = doc.getElementsByTagName("distance");
Node node1 = nl1.item(0);
NodeList nl2 = node1.getChildNodes();
Node node2 = nl2.item(getNodeIndex(nl2, "value"));
Log.i("DistanceValue", node2.getTextContent());
return Integer.parseInt(node2.getTextContent());
}
public String getStartAddress (Document doc) {
NodeList nl1 = doc.getElementsByTagName("start_address");
Node node1 = nl1.item(0);
Log.i("StartAddress", node1.getTextContent());
return node1.getTextContent();
}
public String getEndAddress (Document doc) {
NodeList nl1 = doc.getElementsByTagName("end_address");
Node node1 = nl1.item(0);
Log.i("StartAddress", node1.getTextContent());
return node1.getTextContent();
}
public String getCopyRights (Document doc) {
NodeList nl1 = doc.getElementsByTagName("copyrights");
Node node1 = nl1.item(0);
Log.i("CopyRights", node1.getTextContent());
return node1.getTextContent();
}
public ArrayList<LatLng> getDirection (Document doc) {
NodeList nl1, nl2, nl3;
ArrayList<LatLng> listGeopoints = new ArrayList<LatLng>();
nl1 = doc.getElementsByTagName("step");
if (nl1.getLength() > 0) {
for (int i = 0; i < nl1.getLength(); i++) {
Node node1 = nl1.item(i);
nl2 = node1.getChildNodes();
Node locationNode = nl2.item(getNodeIndex(nl2, "start_location"));
nl3 = locationNode.getChildNodes();
Node latNode = nl3.item(getNodeIndex(nl3, "lat"));
double lat = Double.parseDouble(latNode.getTextContent());
Node lngNode = nl3.item(getNodeIndex(nl3, "lng"));
double lng = Double.parseDouble(lngNode.getTextContent());
listGeopoints.add(new LatLng(lat, lng));
locationNode = nl2.item(getNodeIndex(nl2, "polyline"));
nl3 = locationNode.getChildNodes();
latNode = nl3.item(getNodeIndex(nl3, "points"));
ArrayList<LatLng> arr = decodePoly(latNode.getTextContent());
for(int j = 0 ; j < arr.size() ; j++) {
listGeopoints.add(new LatLng(arr.get(j).latitude, arr.get(j).longitude));
}
locationNode = nl2.item(getNodeIndex(nl2, "end_location"));
nl3 = locationNode.getChildNodes();
latNode = nl3.item(getNodeIndex(nl3, "lat"));
lat = Double.parseDouble(latNode.getTextContent());
lngNode = nl3.item(getNodeIndex(nl3, "lng"));
lng = Double.parseDouble(lngNode.getTextContent());
listGeopoints.add(new LatLng(lat, lng));
}
}
return listGeopoints;
}
private int getNodeIndex(NodeList nl, String nodename) {
for(int i = 0 ; i < nl.getLength() ; i++) {
if(nl.item(i).getNodeName().equals(nodename))
return i;
}
return -1;
}
private ArrayList<LatLng> decodePoly(String encoded) {
ArrayList<LatLng> poly = new ArrayList<LatLng>();
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;
LatLng position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
poly.add(position);
}
return poly;
}
答案 0 :(得分：3)
您可以使用以下代码获取Trvelling时间和距离..我已经在我的项目中使用此代码希望这会对您有所帮助
CalculateDistanceTime distance_task = new CalculateDistanceTime(getActivity());
distance_task.getDirectionsUrl(startLatLng, endLatLng);
distance_task.setLoadListener(new CalculateDistanceTime.taskCompleteListener() {
@Override
public void taskCompleted(String[] time_distance) {
approximate_time.setText("" + time_distance[1]);
approximate_diatance.setText("" + time_distance[0]);
}
});
这里是CalculateDistanceTime类。
import android.content.Context;
import android.os.AsyncTask;
import android.util.Log;
import com.google.android.gms.maps.model.LatLng;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
public class CalculateDistanceTime {
private taskCompleteListener mTaskListener;
private Context mContext;
public CalculateDistanceTime(Context context) {
mContext = context;
}
public void setLoadListener(taskCompleteListener taskListener) {
mTaskListener = taskListener;
}
public void getDirectionsUrl(LatLng origin, LatLng dest) {
// Origin of route
String str_origin = "origin=" + origin.latitude + "," + origin.longitude;
// Destination of route
String str_dest = "destination=" + dest.latitude + "," + dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin + "&" + str_dest + "&" + sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters;
DownloadTask downloadTask = new DownloadTask();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
}
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
Log.d("Exception while downloading url", e.toString());
} finally {
iStream.close();
urlConnection.disconnect();
}
return data;
}
public interface taskCompleteListener {
void taskCompleted(String[] time_distance);
}
private class DownloadTask extends AsyncTask<String, Void, String> {
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try {
// Fetching the data from web service
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
private class ParserTask extends AsyncTask<String, Integer, List<HashMap<String, String>>> {
// Parsing the data in non-ui thread
@Override
protected List<HashMap<String, String>> doInBackground(String... jsonData) {
JSONObject jObject;
List<HashMap<String, String>> routes = null;
try {
jObject = new JSONObject(jsonData[0]);
DistanceTimeParser parser = new DistanceTimeParser();
// Starts parsing data
routes = parser.parse(jObject);
} catch (Exception e) {
e.printStackTrace();
}
return routes;
}
// Executes in UI thread, after the parsing process
@Override
protected void onPostExecute(List<HashMap<String, String>> result) {
String distance = "";
String duration_distance = "";
if (result.size() < 1) {
Log.e("Error : ", "No Points found");
return;
}
String[] date_dist = new String[2];
// Traversing through all the routes
for (int i = 0; i < result.size(); i++) {
// Fetching i-th route
HashMap<String, String> tmpData = result.get(i);
Set<String> key = tmpData.keySet();
Iterator it = key.iterator();
while (it.hasNext()) {
String hmKey = (String) it.next();
duration_distance = tmpData.get(hmKey);
System.out.println("Key: " + hmKey + " & Data: " + duration_distance);
it.remove(); // avoids a ConcurrentModificationException
}
date_dist[i] = duration_distance;
}
mTaskListener.taskCompleted(date_dist);
}
}
}
和DistanceTimeparser
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
public class DistanceTimeParser {
public List<HashMap<String, String>> parse(JSONObject jObject) {
List<HashMap<String, String>> routes = new ArrayList<HashMap<String, String>>();
JSONArray jRoutes = null;
JSONArray jLegs = null;
JSONObject jDistance = null;
JSONObject jDuration = null;
try {
jRoutes = jObject.getJSONArray("routes");
jLegs = ((JSONObject) jRoutes.get(0)).getJSONArray("legs");
List<HashMap<String, String>> path = new ArrayList<HashMap<String, String>>();
/** Getting distance from the json data */
jDistance = ((JSONObject) jLegs.get(0)).getJSONObject("distance");
HashMap<String, String> hmDistance = new HashMap<String, String>();
hmDistance.put("distance", jDistance.getString("text"));
/** Getting duration from the json data */
jDuration = ((JSONObject) jLegs.get(0)).getJSONObject("duration");
HashMap<String, String> hmDuration = new HashMap<String, String>();
hmDuration.put("duration", jDuration.getString("text"));
routes.add(hmDistance);
routes.add(hmDuration);
} catch (JSONException e) {
e.printStackTrace();
} catch (Exception e) {
}
return routes;
}
}
答案 1 :(得分：1)
我认为以下代码可以提供帮助。
Routing.java
public class Routing extends AsyncTask<LatLng, Void, Route>
{
private final GoogleMap map;
private LatLng start;
private LatLng dest;
private final LatLngBounds.Builder builder = new LatLngBounds.Builder();;
private final int[] lineColor = { Color.GREEN };
private final int pos;
public Routing(final Activity activity, final GoogleMap map) {
super();
this.map = map;
this.pos = 0;
}
private TextView txtDistance;
public Routing(final Activity activity, final GoogleMap map, final TextView txtDistance) {
super();
this.map = map;
this.pos = 0;
this.txtDistance = txtDistance;
}
@Override
protected Route doInBackground(final LatLng... points) {
try {
start = points[0];
dest = points[1];
Parser parser;
final String jsonURL = "http://maps.googleapis.com/maps/api/directions/json?";
final StringBuffer sBuf = new StringBuffer(jsonURL);
sBuf.append("origin=");
sBuf.append(start.latitude);
sBuf.append(',');
sBuf.append(start.longitude);
sBuf.append("&destination=");
sBuf.append(dest.latitude);
sBuf.append(',');
sBuf.append(dest.longitude);
sBuf.append("&sensor=true&mode=driving");
System.out.println("sbuf: " + sBuf.toString());
parser = new GoogleParser(sBuf.toString());
final Route route = parser.parse();
return route;
} catch (final Exception e) {}
return null;
}
@Override
protected void onPreExecute() {
/** Empty Method */
}// end onPreExecute method
@SuppressLint("ResourceAsColor")
@Override
protected void onPostExecute(final Route result) {
try {
if (result == null) {
map.moveCamera(CameraUpdateFactory.newLatLngZoom(dest, 15));
map.animateCamera(CameraUpdateFactory.zoomTo(18), 2000, null);
} else {
final String text = result.getTextLength();
final String startAddress = result.getStartAddress().toString().trim().replaceAll(", ", ",\n");
final String endAddress = result.getEndAddress().toString().trim().replaceAll(", ", ",\n");
txtDistance.setVisibility(View.GONE);
if (text != null) {
txtDistance.setVisibility(View.VISIBLE);
txtDistance.setBackgroundResource(android.R.color.holo_orange_light);
txtDistance.setText(" Total Distance : " + text + "\n Total Duration : " + result.getDuration() + " ");
}
final List<LatLng> directionPoint = result.getPoints();
final PolylineOptions rectLine = new PolylineOptions().width(10).color(lineColor[pos]);
for (int i = 0; i < directionPoint.size(); i++) {
rectLine.add(directionPoint.get(i));
}
map.addPolyline(rectLine);
final Marker startLocation = map.addMarker(new MarkerOptions().position(start).title(startAddress).snippet("Main Location").icon(BitmapDescriptorFactory.fromResource(R.drawable.markera)));
final Marker endLocation = map.addMarker(new MarkerOptions().position(dest).title(endAddress).snippet("Destination Location").icon(BitmapDescriptorFactory.fromResource(R.drawable.markerb)));
builder.include(startLocation.getPosition());
builder.include(endLocation.getPosition());
final LatLngBounds bounds = builder.build();
// Pan to see all markers in view.
final int padding = 100; // offset from edges of the map in pixels
final CameraUpdate cup = CameraUpdateFactory.newLatLngBounds(bounds, padding);
map.moveCamera(cup);
map.animateCamera(cup);
}
} catch (final Exception e) {
e.printStackTrace();
}
}// end onPostExecute method
}
在地图活动中添加以下行。
@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (Utils.isGPSTurnOn(getApplicationContext())) {
onResume();
}
}
@Override
protected void onResume() {
super.onResume();
if (Utils.isConnected(getApplicationContext())) {
mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
mMap.setMyLocationEnabled(true);
final TextView txtDistance = (TextView) findViewById(R.id.txtSpeed);
new Routing(getParent(), mMap, txtDistance).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, start, end);
}
}
Utils.java
public class Utils
{
/**
* @Method used to checks if device having network connection or not.
* @param context the context
* @return <code>true</code> if the phone is connected
*/
public static boolean isConnected(final Context context) {
try {
final ConnectivityManager connMngr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
final NetworkInfo wifiNetwork = connMngr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
if (wifiNetwork != null && wifiNetwork.isConnectedOrConnecting()) { return true; }
final NetworkInfo mobileNetwork = connMngr.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
if (mobileNetwork != null && mobileNetwork.isConnectedOrConnecting()) { return true; }
final NetworkInfo activeNetwork = connMngr.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.isConnectedOrConnecting()) { return true; }
} catch (final Exception e) {
e.printStackTrace();
}
return false;
}
public static boolean isGPSTurnOn(final Context context) {
final LocationManager manager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
return manager.isProviderEnabled(LocationManager.GPS_PROVIDER);
}
}
activity_map.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<fragment
android:id="@+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.MapFragment" />
<TextView
android:id="@+id/txtSpeed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:textStyle="bold"
android:text="@string/hello_world" />
</RelativeLayout>