Develop Reference

OnTouch on google maps removes the drag and scroll in mapview as well as zoom controls dont appear ontouch

ok as the question says I have a mapview and a OnTouchListener set to it and in the Ontouch function i set a overlay image on the map. But in this process now the zoom controls and drag functionality in the mapview is removed somehow. please help me out with it.
I have already setzoomcontrolson to true (no effect). Help please.
public class marker extends ItemizedOverlay {
Context mContext;
OverlayItem overlayitem;
Drawable marker;
private int xDragImageOffset=0;
private int yDragImageOffset=0;
private int xDragTouchOffset=0;
private int yDragTouchOffset=0;
OverlayItem inDrag;
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
public marker(Drawable defaultMarker, Context context) {
super(boundCenterBottom(defaultMarker));
mContext = context;
marker=defaultMarker;
}
public void addOverlay(OverlayItem overlay) {
mOverlays.clear();
mOverlays.add(overlay);
populate();
}
#Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
#Override
public int size() {
return mOverlays.size();
}
#Override
public boolean onTap(GeoPoint geoPoint, MapView mapView){
boolean tappedAnOverlay = super.onTap(geoPoint, mapView);
if (tappedAnOverlay) {
places.gp=geoPoint; // do your thing if hit an overlay
}
else {
// no overlay found in that location
}
MapController mc=mapView.getController();
mc.animateTo(geoPoint);
return true;
}
}
this is my marker overlays file
and
public class places extends MapActivity implements android.view.View.OnClickListener/*,OnTouchListener*/ {
MapView mapView;
MapController mc;
Button srchbtn;
EditText searchstring;
marker itemizedoverlay;
public static List<Overlay> mapOverlays;
OverlayItem overlayitem;
public static GeoPoint gp;
Button back;
String s1;
String s2="yourprofile";
String s3="partnerprofile";
public int zoom=5;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.place);
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
srchbtn=(Button)findViewById(R.id.searchbtn);
searchstring=(EditText)findViewById(R.id.edplnm);
srchbtn.setOnClickListener(this);
mapView.setClickable(true);
mapView.setBuiltInZoomControls(true);
mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.marker);
itemizedoverlay = new marker(drawable, this);
back=(Button)findViewById(R.id.btnbk);
back.setOnClickListener(this);
s1=getIntent().getStringExtra("ClassName");
mc=mapView.getController();
mc.setZoom(zoom);
gp=new GeoPoint((int)(21.7679 * 1E6), (int)(78.8718 * 1E6));
mc.animateTo(gp);
// mapView.setOnTouchListener(this);
}
#Override
protected boolean isRouteDisplayed() {
return false;
}
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch(arg0.getId())
{
case R.id.searchbtn:String s = searchstring.getText().toString();
String[] vals =s.split(":");
float lat;
float logi;
lat=Float.parseFloat(vals[0]);
logi=Float.parseFloat(vals[1]);
gp = new GeoPoint((int)(lat * 1E6), (int)(logi * 1E6));
MapController mc=mapView.getController();
mc.setZoom(80);
mc.animateTo(gp);
overlayitem = new OverlayItem(gp, "", "");
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
break;
case R.id.btnbk: int Lat;
int Logi;
Lat=gp.getLatitudeE6();
Logi=gp.getLongitudeE6();
boolean val=s1.equals(s2);
boolean val2=s1.equals(s3);
Intent I1=new Intent(places.this,yourprofile.class);
Intent I2=new Intent(places.this,partnerprofile.class);
if(val)
{
I1.putExtra("LAT",Lat);
I1.putExtra("LONG",Logi);
setResult(RESULT_OK,I1);
finish();
}else
if(val2)
{
I2.putExtra("LAT",Lat);
I2.putExtra("LONG",Logi);
setResult(RESULT_OK,I2);
finish();
}
break;
}
}
/*public boolean onTouch(View v, MotionEvent e) {
if(e.getAction()==MotionEvent.ACTION_UP){
Projection p =((MapView)v).getProjection();
gp = p.fromPixels((int) e.getX(), (int) e.getY());
overlayitem = new OverlayItem(gp, "", "");
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
mc.setZoom(zoom);
mc.animateTo(gp);
searchstring.setText(((float)gp.getLatitudeE6())/1000000 + ":" +
((float)gp.getLongitudeE6())/1000000);
}
return true;
}*/
}
this is my places class file

Here is the Sample Working Demo which you may want to Use.
It will help you to Drag&Drop the Image with Zooming and Touch Functionality for Mapview.
Hope it will Help.

Showing multiple overlays in single geo point..?

I have an image to show in the overlay while clicking in the drop pin in the map. Possibly,Two or more images belongs to the same latitude and longitude. In this case, I want to show all the images belongs to that particular latitude and longitude..! How can i achieve this.?
This is what i have tried..!
for (int i = 0; i < AllData.neardeallist.size(); i++) {
mapOverlays = mapview.getOverlays();
drawable = this.getResources().getDrawable(R.drawable.pin);
itemizedOverlay = new CustomItemizedOverlay<CustomOverlayItem>(
drawable, mapview);
point = new GeoPoint((int) (Double.parseDouble(AllData.neardeallist
.get(i).getLatitude()) * 1E6),
(int) (Double.parseDouble(AllData.neardeallist
.get(i).getLongitude()) * 1E6));
CustomOverlayItem overlayItem = new CustomOverlayItem(point,
StringEscapeUtils.unescapeXml(StringEscapeUtils
.unescapeHtml4(AllData.neardeallist.get(i)
.getDealTitle())),
StringEscapeUtils.unescapeXml(StringEscapeUtils
.unescapeHtml4(AllData.neardeallist.get(i)
.getDescription()))
+ ":"
+ AllData.neardeallist.get(i).getDealId()
+ ":" + AllData.neardeallist.get(i).getDealKey(),
AllData.neardeallist.get(i).getDealImg());
itemizedOverlay.addOverlay(overlayItem);
mapOverlays.add(itemizedOverlay);
My Custom overlay class..!
public class CustomItemizedOverlay extends
BalloonItemizedOverlay {
private ArrayList<CustomOverlayItem> m_overlays = new ArrayList<CustomOverlayItem>();
private Context c;
public CustomItemizedOverlay(Drawable defaultMarker, MapView mapView) {
super(boundCenter(defaultMarker), mapView);
c = mapView.getContext();
}
public void addOverlay(CustomOverlayItem overlay) {
m_overlays.add(overlay);
populate();
}
protected CustomOverlayItem createItem(int i) {
return m_overlays.get(i);
}
public int size() {
return m_overlays.size();
}
protected boolean onBalloonTap(int i, CustomOverlayItem item) {
String[] Address = m_overlays.get(i).getSnippet().split(":");
Intent intent = new Intent(c, DealDetails.class);
intent.putExtra("deal_id", Address[1]);
intent.putExtra("deal_key", Address[2]);
c.startActivity(intent);
return true;
}
#Override
protected BalloonOverlayView<CustomOverlayItem> createBalloonOverlayView() {
// use our custom balloon view with our custom overlay item type:
return new CustomBalloonOverlayView<CustomOverlayItem>(getMapView()
.getContext(), getBalloonBottomOffset());
}
}

Map overlay in android app

I am trying to add a pin image to certain places to my map in my android application, but then there is a big semi transparent rectangle that appears over my map, that does not allow me to interact with the main map, I have tried using map overlay or itemized map overlay, but i get the same result, I dont know if this is because of the image, or this is usually what happens when someone adds an overlay to his map.
PS I am using a .png image
If anyone could help me i would be so grateful
thanks
this is the itemized overlay class
private class MirItemizedOverlay extends ItemizedOverlay {
private List<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
public MirItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
// TODO Auto-generated constructor stub
}
#Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
#Override
public int size() {
return mOverlays.size();
}
public void addOverlayItem(OverlayItem overlayItem) {
mOverlays.add(overlayItem);
populate();
}
public void addOverlayItem(int lat, int lon, String title) {
GeoPoint point = new GeoPoint(lat, lon);
OverlayItem overlayItem = new OverlayItem(point, title, null);
addOverlayItem(overlayItem);
}
}
and this is how I use it in the oncreate method in my map activity
Drawable makerDefault =this.getResources().getDrawable(R.drawable.redcircle);
MirItemizedOverlay itemizedOverlay = new MirItemizedOverlay(makerDefault);
GeoPoint point = new GeoPoint((int) (49.9736518*1E6), (int) (7.114648 *1E6));
OverlayItem overlayItem = new OverlayItem(point, "hotspot1", null);
itemizedOverlay.addOverlayItem((int) (49.9736518*1E6), (int) (7.114648 *1E6), "hotspot1");

You should add your itemizedOverlay to MapView overlays:
MapView mapView = ...;
mapView.getOverlays().add(itemizedOverlay);

getting marker in current location

I'm a biggener with android app and i'm interested in GeoLocalisation app.
so, I developed an application that returns the current location of the user device (Latitude/longitude) and my problem is that I want to get a marker in that location.
you can find my source code in this link so please i'l someone knows how to solve this problem i'm gonna be greatfull
http://hotfile.com/dl/134520763/75c0f91/current_location.rar.html

class HelloItemizedOverlay extends ItemizedOverlay {
private ArrayList mOverlays = new ArrayList();
private Context mContext;
public HelloItemizedOverlay(Drawable defaultMarker, Context context) {
super(boundCenterBottom(defaultMarker));
mContext = context;
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
#Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
#Override
public int size() {
return mOverlays.size();
}
#Override
protected boolean onTap(int index) {
OverlayItem item = mOverlays.get(index);
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
return true;
}
}
GeoPoint geoPoint = new GeoPoint((int) (latitude * 1E6), (int) (longitude * 1E6));
mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.pin);
itemizedOverlay = new HelloItemizedOverlay(drawable, this);
overlayItem = new OverlayItem(geoPoint, "Starting Location", "any text");
itemizedOverlay.addOverlay(overlayItem);
mapOverlays.add(itemizedOverlay);
MapController mapController = mapView.getController();
mapController.animateTo(geoPoint);

Post you code inline. You will need to use something like ItemizedOverLay. Look Here

adding multiple marker on google map in android

I am triyng to add multiple marker on google map. Here is my code section
public class GoogleMap extends MapView
{
MapController mc;
MapView mapView;
GeoPoint p;
#Override
public void onCreate(Bundle savedInstanceState)
{
....
double lat = Double.parseDouble(bundle.getString("paramLat"));
double lng = Double.parseDouble(bundle.getString("paramLong"));
mc = mapView.getController();
p = new GeoPoint( (int) (lat * 1E6), (int) (lng * 1E6));
mc.animateTo(p);
mc.setZoom(17);
//---Add a location marker---
MapOverlay mapOverlay = new MapOverlay();
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
mapView.invalidate();
}
class MapOverlay extends com.google.android.maps.Overlay
{
#Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when)
{
super.draw(canvas, mapView, shadow);
//---translate the GeoPoint to screen pixels---
Point screenPts = new Point();
mapView.getProjection().toPixels(p, screenPts);
//---add the marker---
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.pushpin);
canvas.drawBitmap(bmp, screenPts.x, screenPts.y-50, null);
return true;
}
}
I have two question here. When i tried to add only one marker, it works but draw method is invoked many times. But why? and when is it invoked?
The second question is how can i add new marker. I created second geoPoint named p2 and after that what should i do? Thank you very much.

I have implemented the multiple markers in my project. Here is the sample code; some things that you need to change is the marker image, the length (number of marker you want define in the for loop). Hope this will help!!!
public class ShowMapActivity extends MapActivity{
private MapController mapControll;
private GeoPoint geoPoint=null;
private MapView mapview;
private MyItemizedOverlay userPicOverlay;
private MyItemizedOverlay nearPicOverlay;
private Drawable userPic,atmPic;
private OverlayItem nearatms[] = new OverlayItem[50];
public static Context context;
#Override
protected void onCreate(Bundle icicle) {
// TODO Auto-generated method stub
super.onCreate(icicle);
context = getApplicationContext();
setContentView(R.layout.your layout xml);
showMap();
}
public void showMap() {
// TODO Auto-generated method stub
try {
geoPoint = new GeoPoint((int)(latitude * 1E6),(int)(longitude * 1E6));
mapview = (MapView)findViewById(R.id.mapview);
mapControll= mapview.getController();
mapview.setBuiltInZoomControls(true);
mapview.setStreetView(true);
mapControll.setZoom(16);
mapControll.animateTo(geoPoint);
userPic = this.getResources().getDrawable(R.drawable.your pic);
userPicOverlay = new MyItemizedOverlay(userPic);
OverlayItem overlayItem = new OverlayItem(geoPoint, "I'm Here!!!", null);
userPicOverlay.addOverlay(overlayItem);
mapview.getOverlays().add(userPicOverlay);
atmPic = this.getResources().getDrawable(R.drawable.your pic);
nearPicOverlay = new MyItemizedOverlay(atmPic);
for (int i = 0; i < define your length here; i++) {
nearatms[i] = new OverlayItem(new GeoPoint((int)((latitude) * 1E6)),(int)(longitude) * 1E6)),"Name", null);//just check the brackets i just made change here so....
nearPicOverlay.addOverlay(nearatms[i]);
}
mapview.getOverlays().add(nearPicOverlay);
//Added symbols will be displayed when map is redrawn so force redraw now
mapview.postInvalidate();
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
Itemized Class for placing the marker
public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> myOverlays ;
public MyItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
myOverlays = new ArrayList<OverlayItem>();
populate();
}
public void addOverlay(OverlayItem overlay){
myOverlays.add(overlay);
populate();
}
#Override
protected OverlayItem createItem(int i) {
return myOverlays.get(i);
}
// Removes overlay item i
public void removeItem(int i){
myOverlays.remove(i);
populate();
}
// Returns present number of items in list
#Override
public int size() {
return myOverlays.size();
}
public void addOverlayItem(OverlayItem overlayItem) {
myOverlays.add(overlayItem);
populate();
}
public void addOverlayItem(int lat, int lon, String title) {
try {
GeoPoint point = new GeoPoint(lat, lon);
OverlayItem overlayItem = new OverlayItem(point, title, null);
addOverlayItem(overlayItem);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
#Override
protected boolean onTap(int index) {
// TODO Auto-generated method stub
String title = myOverlays.get(index).getTitle();
Toast.makeText(ShowMapActivity.context, title, Toast.LENGTH_LONG).show();
return super.onTap(index);
}
}

To prevent the multiple drawing you need a cache. This is a bug in the draw method of MapOverlay
To add multiple markers you have to use ItemizedOverlay. This may help you.

You should follow the Android Map View tutorial on the developers site.
Part 2 has the section for building an Overlay.
http://developer.android.com/resources/tutorials/views/hello-mapview.html
Minimal work should be done in the Draw method; it is called a lot including everytime the map is moved/zoomed/"invalidated"

Your going to want to start with an ItemizedOverlay which is an array of points. You can find the documentation here http://code.google.com/android/add-ons/google-apis/reference/index.html . Then your going to want to invoke the ItemizedOverlay.draw() method which will draw all the points within it based on their position. Hope this helps.