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());
}
}

How to remove an ItemOverlay on touch and add another on touch?

This is MapOverlay:
class MapOverlay extends com.google.android.maps.Overlay
{
#Override
public boolean draw(Canvas canvas, MapView mapView,
boolean shadow, long when)
{
return true;
}
#Override
public boolean onTouchEvent(MotionEvent event, MapView mapView)
{
//---when user lifts his finger---
if (event.getAction() == 1) {
GeoPoint p = mapView.getProjection().fromPixels(
(int) event.getX(),
(int) event.getY());
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = getResources().getDrawable(R.drawable.splash_logo);
ItemizedOverlay itemizedoverlay = new ItemizedOverlay(drawable, getApplicationContext());
OverlayItem overlayitem = new OverlayItem(p, "I'm in LA!");
itemizedoverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedoverlay);
mapView.invalidate();
Geocoder geoCoder = new Geocoder(
getBaseContext(), Locale.getDefault());
try {
List<Address> addresses = geoCoder.getFromLocation(
p.getLatitudeE6() / 1E6,
p.getLongitudeE6() / 1E6, 1);
String add = "";
if (addresses.size() > 0)
{
for (int i=0; i<addresses.get(0).getMaxAddressLineIndex();
i++)
add += addresses.get(0).getAddressLine(i) + "\n";
}
//Toast.makeText(getBaseContext(), add, Toast.LENGTH_SHORT).show();
addr = add;
}
catch (IOException e) {
e.printStackTrace();
}
return true;
}
else
return false;
}
}
This is ItemizedOverlay:
class ItemizedOverlay extends com.google.android.maps.ItemizedOverlay<OverlayItem>{
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;
public ItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
// TODO Auto-generated constructor stub
}
public ItemizedOverlay(Drawable defaultMarker, Context context) {
super(boundCenterBottom(defaultMarker));
mContext = context;
}
#Override
protected OverlayItem createItem(int i) {
return mOverlays.get(i);
}
#Override
public int size() {
return mOverlays.size();
}
public void addOverlay(OverlayItem overlay) {
mOverlays.add(overlay);
populate();
}
public void removeOverlay(OverlayItem overlay) {
mOverlays.remove(overlay);
populate();
}
public void clear() {
mOverlays.clear();
populate();
}
#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;
}
}
I'm able to add more than one item overlay with this but not able to call clear so that as to remove the itemziedoverylay item.
What I want to do is this: When I touch on a particular point of the map, the previous itemized overlays should be deleted and a new one at that point should be created. I know I've to call clear() but not able to figure out where exactly should I do it.

Hi you have to write this code in your mapoverlay Class
if (itemizedoverlay != null) {
itemizedoverlay.overlayClear();
}

Cannot get touchevent from Google Maps

I'm having some issues registering when somebody has touched somewhere on the map.
I have this source
public class GMapsActivity extends MapActivity {
private MapView mapView;
private static final int latitudeE6 = 37985339;
private static final int longitudeE6 = 23716735;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mapView = (MapView) findViewById(R.id.map_view);
mapView.setBuiltInZoomControls(true);
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.icon);
CustomItemizedOverlay itemizedOverlay = new CustomItemizedOverlay(drawable, this);
GeoPoint point = new GeoPoint(latitudeE6, longitudeE6);
OverlayItem overlayitem = new OverlayItem(point, "Hello", "I'm in Athens, Greece!");
itemizedOverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedOverlay);
//mapOverlays.add(TouchOverlay);
MapController mapController = mapView.getController();
mapController.animateTo(point);
mapController.setZoom(6);
}
#Override
protected boolean isRouteDisplayed() {
return false;
}
class MapOverlap extends com.google.android.maps.Overlay {
public boolean onTouchEvent(MotionEvent event, MapView mapView) {
if (event.getAction() == 1){
GeoPoint p = mapView.getProjection().fromPixels( (int) event.getX(), (int) event.getY());
Toast.makeText(getBaseContext(), p.getLatitudeE6()/1E6 + "," + p.getLongitudeE6()/1E6 , Toast.LENGTH_SHORT).show();
}
return false;
}
}
}
And CustomItemizedOverlay
public class CustomItemizedOverlay extends ItemizedOverlay<OverlayItem> {
private ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>();
private Context context;
public CustomItemizedOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
}
public CustomItemizedOverlay(Drawable defaultMarker, Context context) {
this(defaultMarker);
this.context = context;
}
#Override
protected OverlayItem createItem(int i) {
return mapOverlays.get(i);
}
#Override
public int size() {
return mapOverlays.size();
}
#Override
protected boolean onTap(int index) {
OverlayItem item = mapOverlays.get(index);
AlertDialog.Builder dialog = new AlertDialog.Builder(context);
dialog.setTitle(item.getTitle());
dialog.setMessage(item.getSnippet());
dialog.show();
return true;
}
public void addOverlay(OverlayItem overlay) {
mapOverlays.add(overlay);
this.populate();
}
}
I added in the (yet it doesn't seem to do anything)
class MapOverlap extends com.google.android.maps.Overlay {
public boolean onTouchEvent(MotionEvent event, MapView mapView) {
if (event.getAction() == 1){
GeoPoint p = mapView.getProjection().fromPixels( (int) event.getX(), (int) event.getY());
Toast.makeText(getBaseContext(), p.getLatitudeE6()/1E6 + "," + p.getLongitudeE6()/1E6 , Toast.LENGTH_SHORT).show();
}
return false;
}
Have I implemented the class correctly? Does anyone know how to fix this?

In your second constructor, you are missing this line of code:
super(boundCenterBottom(defaultMarker));
Instead of:
this(defaultMarker);

Placing shape into MapView in Android

Is there a way to place a shape (drawable or shape of any kind) that occupies a specific area in MapView (lat/lon area) not pixel area . I need that for GeoPoint Clustering purposes
If that is not possible any guidance to do it with projection coordinates would be greatly appreciated. But using the MapView canvas to do this doesn't seem performance-wise since i recycle my Overlay Items all the time and i wish i could take advantage of that too.

Look atItemizedOverlay
I'm culling from my code, so this probably wont' compile out of the box, but should give you enough to figure it out from here...
extended class:
public class MyOverlay extends ItemizedOverlay<OverlayItem>
{
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private Context mContext;
private OverlayItem item;
public MyOverlay(Drawable defaultMarker, Context context)
{
super(boundCenterBottom(defaultMarker));
mContext = context;
}
public void addOverlay(OverlayItem overlay)
{
mOverlays.add(overlay);
}
public void doPopulate()
{
populate();
}
#Override
protected OverlayItem createItem(int i)
{
return mOverlays.get(i);
}
#Override
public int size()
{
return mOverlays.size();
}
}
and then in your activity....
public void addLocations(GeoPoint _center)
{
final GeoPoint center = _center;
mapOverlays = mapView.getOverlays();
Drawable drawable = MyActivity.this.getResources().getDrawable(R.drawable.map_annotation_pin);
itemizedoverlay = new ScoopOverlay(drawable,mContext);
//add as many points as you wish...
itemizedoverlay.addOverlay(
new OverlayItem(new GeoPoint(/*lon lat data here*/));
);
showResults.sendEmptyMessage(0);
}
private Handler showResults = new Handler()
{
#Override
public void handleMessage(Message msg)
{
itemizedoverlay.doPopulate();
mapOverlays.add(itemizedoverlay);
mapView.invalidate();
}
};

So the solution is to draw to the ItemizedOverlay that holds the items.
#Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
super.draw(canvas, mapView, shadow);
// cycle through all overlays
for (int index = 0; index < mOverlays.size(); index++) {
OverlayItemExtended item = mOverlays.get(index);
// Converts lat/lng-Point to coordinates on the screen
GeoPoint point = item.getPoint();
Point ptScreenCoord = new Point();
mapView.getProjection().toPixels(point, ptScreenCoord);
Paint boxPaint = new Paint();
boxPaint.setColor(android.graphics.Color.WHITE);
boxPaint.setStyle(Paint.Style.FILL);
boxPaint.setAlpha(140);
canvas.drawCircle(ptScreenCoord.X, ptScreenCoord.y,
20, boxPaint);
}
}