我想在我的数据库中显示多个具有纬度和经度值的标记，但问题是当条件为真时它只返回1或0（表示地图上只显示一个标记）plz给我一个解决方案如何在地图上用标记显示lat和lng的多个值
这是我的代码：
public class Map extends Activity implements OnClickListener {
TextView Test;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maptest);
status();
}
public void status() {
int locationCount =locationCount() ;
for(int i=0;i<locationCount;i++)
{
double Latt = Lat();
double Lngg = Lng();
Test=(TextView)findViewById(R.id.test);
String lat = new Double(Latt).toString();
String lng = new Double(Lngg).toString();
Test.setText(lng+ lat);
}
}
public static String convertStreamToString(InputStream is)
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
}
catch (IOException e) {
e.printStackTrace();
}
finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
public static double Lng()
{
try
{
DefaultHttpClient httpClient=new DefaultHttpClient();
//Connect to the server
HttpGet httpGet=new HttpGet("http://10.0.2.2:51220/Service1.svc/Lng");
//Get the response
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
InputStream stream=httpEntity.getContent();
//Convert the stream to readable format
String result= convertStreamToString(stream);
if(result.charAt(1)=='1')
{
return 1;
}
else
{
return 0;
}
}
catch(Exception e)
{
return 0;
}
}
public static double Lat()
{
try
{
DefaultHttpClient httpClient=new DefaultHttpClient();
//Connect to the server
HttpGet httpGet=new HttpGet("http://10.0.2.2:51220/Service1.svc/Lat");
//Get the response
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
InputStream stream=httpEntity.getContent();
//Convert the stream to readable format
String result= convertStreamToString(stream);
if(result.charAt(1)=='1')
{
return 1;
}
else
{
return 0;
}
}
catch(Exception e)
{
return 0;
}
}
public static int locationCount()
{
try
{
DefaultHttpClient httpClient=new DefaultHttpClient();
//Connect to the server
HttpGet httpGet=new HttpGet("http://10.0.2.2:51220/Service1.svc/locationCount");
//Get the response
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
InputStream stream=httpEntity.getContent();
//Convert the stream to readable format
String result= convertStreamToString(stream);
if(result.charAt(1)=='1')
{
return 1;
}
else
{
return 0;
}
}
catch(Exception e)
{
return 0;
}
}
}`
EDIT1
好的，这是10.0.2.2:51220/Service1.svc/getLat
的输出output:
<ArrayOfTrafficConditions>
<TrafficConditions>
<Lat>27.0006748</Lat>
<Latitude>27.0006748</Latitude>
</TrafficConditions>
<TrafficConditions>
<Lat>64.700064</Lat>
<Latitude>64.700064</Latitude>
</TrafficConditions></ArrayOfTrafficConditions>
这是webserivce的c＃代码
namespace JSONSample
{
public class DataAccess
{
SqlConnection con;
public DataAccess()
{
con = new SqlConnection("Data Source=SE7EN-PC;Initial Catalog=Demo;Integrated Security=True");
}
public List<TrafficConditions> getLat()
{
List<TrafficConditions> Lat= new List<TrafficConditions>();
{
con.Open();
SqlCommand command = new SqlCommand("SELECT DISTINCT Latitude FROM TrafficConditions ", con);
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
TrafficConditions loc = new TrafficConditions();
loc.Latitude = Convert.ToDouble(reader["Latitude"]);
Lat.Add(loc);
}
return Lat.ToList();
}
}
public List<Conditions> getLng()
{
List<Conditions> Lng = new List<Conditions>();
{
con.Open();
SqlCommand command = new SqlCommand("SELECT DISTINCT Longitude FROM TrafficConditions", con);
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
Conditions loc = new Conditions();
loc.Longitude = Convert.ToDouble(reader["Longitude"]);
Lng.Add(loc);
}
return Lng.ToList();
}
}
我只想将lat long值传递给我的Android应用程序而不是整个json值
EDIT2
抱歉这是我实际的地图活动代码
public class MapActivity extends FragmentActivity {
GoogleMap map;
ArrayList<LatLng> markerPoints;
ArrayList<LatLng> marker;
StatusClass gsp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
// Initializing
markerPoints = new ArrayList<LatLng>();
marker = new ArrayList<LatLng>();
// Getting reference to SupportMapFragment of the activity_main
SupportMapFragment fm = (SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.map);
// Getting Map for the SupportMapFragment
map = fm.getMap();
if(map!=null){
// Enable MyLocation Button in the Map
map.setMyLocationEnabled(true);
Get();
}
}
public void Get() {
Calendar c1 = Calendar.getInstance();
SimpleDateFormat sdf1 = new SimpleDateFormat("d/M/yy h:m:s a");
String strdate1 = sdf1.format(c1.getTime());
GPSTracker gps = new GPSTracker(MapActivity.this);
gps.canGetLocation();
double Latitude = gps.getLatitude();
double Longitude = gps.getLongitude();
// Adding new item to the ArrayList
markerPoints.add(new LatLng(Latitude,Longitude ));
// Creating MarkerOptions
MarkerOptions options = new MarkerOptions();
// Setting the position of the marker
options.position(new LatLng(Latitude,Longitude ));
options.title(strdate1+"");
//options.snippet(Timestemp()+ " last updated");
/**
* For the start location, the color of marker is GREEN and
* for the end location, the color of marker is RED.
*/
if(markerPoints.size()>=1){
options.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
}
// Add new marker to the Google Map Android API V2
map.addMarker(options);
}
public ArrayList<Double> FromJSONtoArrayListLat() {
ArrayList<Double> ListLat = new ArrayList<Double>();
try {
// Replace it with your own WCF service path
URL json = new URL("http://10.0.2.2:51220/Service1.svc/getLat");
URLConnection jc = json.openConnection();
BufferedReader reader = new BufferedReader(new InputStreamReader(jc.getInputStream()));
String line = reader.readLine();
JSONObject jsonResponse = new JSONObject(line);
JSONArray jsonArray = jsonResponse.getJSONArray("getLat");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jObject = (JSONObject)jsonArray.get(i);
// "FullName" is the property of .NET object spGetPersonsResult,
// and also the name of column in SQL Server 2008
ListLat.add(jObject.getDouble("Latitude"));
}
reader.close();
} catch(Exception e){
Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show();
}
return ListLat;
}
public ArrayList<Double> FromJSONtoArrayListLng() {
ArrayList<Double> ListLng = new ArrayList<Double>();
try {
// Replace it with your own WCF service path
URL json = new URL("http://10.0.2.2:51220/Service1.svc/getLng");
URLConnection jc = json.openConnection();
BufferedReader reader = new BufferedReader(new InputStreamReader(jc.getInputStream()));
String line = reader.readLine();
JSONObject jsonResponse = new JSONObject(line);
JSONArray jsonArray = jsonResponse.getJSONArray("getLng");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jObject = (JSONObject)jsonArray.get(i);
// "FullName" is the property of .NET object spGetPersonsResult,
// and also the name of column in SQL Server 2008
ListLng.add(jObject.getDouble("Longitude"));
}
reader.close();
} catch(Exception e){
Toast.makeText(this, e.toString(), Toast.LENGTH_LONG).show();
}
return ListLng;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
现在使用此代码如何获取经度和纬度值以显示多个标记？你能帮我吗
答案 0 :(得分：0)
首先，请使用像这样的MapActivity：
public class Map extends MapActivity implements LocationListener
{
gMapView = (MapView) findViewById(R.id.mapview);
//This is how you get a position on the map.
p = new GeoPoint((int) (latitude * 1000000), (int) (longitude * 1000000));
gMapView.setSatellite(true);//set the view type of your map.
// Add a location mark or overlays here like so . . .
myLocationOverlay = new MyLocationOverlay2();
//This is the list of overlays.
List<Overlay> list = gMapView.getOverlays();
//Add myLocationOverlay in the list.
list.add(myLocationOverlay);
// and so on ...
}
我使用MyLocationOverlay2用叠加层更新我的地图。但您可以使用它来添加或更新标记。举个例子，这是该类的代码：
protected class MyLocationOverlay2 extends com.google.android.maps.Overlay
{
@Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when)
{
//-------------------------------------
// Drawing the path
//-------------------------------------
//If the location has at least 2 points in the array.
if(geoPointCollection.size()>=3)
{
//Configuring the paint brush
Paint mPaint = new Paint();
mPaint.setDither(true);
mPaint.setColor(Color.argb(255, 255, 72, 0));
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(5);
//-------------------------------------
// Drawing the paths
//-------------------------------------
int temp = 0;
Point tempp = new Point();
for(int i = 1; i < geoPointCollection.size()-1;i++)
{
Point point1 = new Point();
Point point2 = new Point();
Path path = new Path();
mapView.getProjection().toPixels(geoPointCollection.get(i), point1);
mapView.getProjection().toPixels(geoPointCollection.get(i+1), point2);
path.moveTo(point1.x, point1.y);
path.lineTo(point2.x,point2.y);
canvas.drawPath(path, mPaint);
temp = i+1;
tempp = point1;
}
Paint paint = new Paint();
super.draw(canvas, mapView, shadow);
// Converts lat/lng-Point to OUR coordinates on the screen.
mapView.getProjection().toPixels(geoPointCollection.get(temp), tempp);
paint.setStrokeWidth(1);
paint.setARGB(255, 255, 255, 255);
paint.setStyle(Paint.Style.STROKE);
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.indicator);
canvas.drawBitmap(bmp, tempp.x-28, tempp.y-28, paint);
}
else
{
//-------------------------------------
//Drawing the Crosshair on the map.
//-------------------------------------
Paint paint = new Paint();
super.draw(canvas, mapView, shadow);
// Converts lat/lng-Point to OUR coordinates on the screen.
Point myScreenCoords = new Point();
mapView.getProjection().toPixels(p, myScreenCoords);
paint.setStrokeWidth(1);
paint.setARGB(255, 255, 255, 255);
paint.setStyle(Paint.Style.STROKE);
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.indicator);
canvas.drawBitmap(bmp, myScreenCoords.x-28, myScreenCoords.y-28, paint);
}
return true;
}
}
您也可以这样做，只需更新以特定间隔运行的处理程序中的地图叠加层。
答案 1 :(得分：0)
好的，这是10.0.2.2:51220/Service1.svc/getLat
的输出output:
<ArrayOfTrafficConditions>
<TrafficConditions>
<Lat>27.0006748</Lat>
<Latitude>27.0006748</Latitude>
</TrafficConditions>
<TrafficConditions>
<Lat>64.700064</Lat>
<Latitude>64.700064</Latitude>
</TrafficConditions></ArrayOfTrafficConditions>
这是webserivce的c＃代码
namespace JSONSample
{
public class DataAccess
{
SqlConnection con;
public DataAccess()
{
con = new SqlConnection("Data Source=SE7EN-PC;Initial Catalog=Demo;Integrated Security=True");
}
public List<TrafficConditions> getLat()
{
List<TrafficConditions> Lat= new List<TrafficConditions>();
{
con.Open();
SqlCommand command = new SqlCommand("SELECT DISTINCT Latitude FROM TrafficConditions ", con);
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
TrafficConditions loc = new TrafficConditions();
loc.Latitude = Convert.ToDouble(reader["Latitude"]);
Lat.Add(loc);
}
return Lat.ToList();
}
}
public List<Conditions> getLng()
{
List<Conditions> Lng = new List<Conditions>();
{
con.Open();
SqlCommand command = new SqlCommand("SELECT DISTINCT Longitude FROM TrafficConditions", con);
SqlDataReader reader = command.ExecuteReader();
while (reader.Read())
{
Conditions loc = new Conditions();
loc.Longitude = Convert.ToDouble(reader["Longitude"]);
Lng.Add(loc);
}
return Lng.ToList();
}
}
我只想将lat long值传递给我的Android应用程序而不是整个json值