Kyogs: Mapview :Drag and drop marker on Google map view with pop-up.

Here in this blog i implement Itemized-overlay with handling onTap and onTouchevent.
As shown below onTap method is used for pop-up and onTouch method is used for drag and drop pin at particular location.

public class MapDemoActivity extends MapActivity {
private MapView map = null;
private MyLocationOverlay me = null;
List<Overlay> mapOverlays;
boolean flag;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map_demo);

map = (MapView) findViewById(R.id.map);

map.getController().setCenter(
getPoint(40.76793169992044, -73.98180484771729));
map.getController().setZoom(17);
map.setBuiltInZoomControls(true);

mapOverlays = map.getOverlays();

Drawable marker = getResources().getDrawable(R.drawable.mekr);

marker.setBounds(0, 0, marker.getIntrinsicWidth(),
marker.getIntrinsicHeight());

map.getOverlays().add(new SitesOverlay(marker, map));

me = new MyLocationOverlay(this, map);
map.getOverlays().add(me);
}

@Override
public void onResume() {
super.onResume();

me.enableCompass();
}

public MapView getMapView() {
return this.map;
}

@Override
public void onPause() {
super.onPause();

me.disableCompass();
}

@Override
protected boolean isRouteDisplayed() {
return (false);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_S) {
map.setSatellite(!map.isSatellite());
return (true);
} else if (keyCode == KeyEvent.KEYCODE_Z) {
map.displayZoomControls(true);
return (true);
}

return (super.onKeyDown(keyCode, event));
}

private GeoPoint getPoint(double lat, double lon) {
return (new GeoPoint((int) (lat * 1000000.0), (int) (lon * 1000000.0)));
}

private class SitesOverlay extends ItemizedOverlay<OverlayItem> {
private List<OverlayItem> items = new ArrayList<OverlayItem>();
private Drawable marker = null;
private OverlayItem inDrag = null;
private ImageView dragImage = null;
private int xDragImageOffset = 0;
private int yDragImageOffset = 0;
private int xDragTouchOffset = 0;
private int yDragTouchOffset = 0;
private Context c;
public int selectedIndex = -1;
private final Bitmap bitMap;
private View view = null;
private boolean isPinch = false;

public SitesOverlay(Drawable marker, MapView mapView) {
super(boundCenter(marker));
this.marker = marker;
c = mapView.getContext();
dragImage = (ImageView) findViewById(R.id.drag);
xDragImageOffset = dragImage.getDrawable().getIntrinsicWidth() / 2;
yDragImageOffset = dragImage.getDrawable().getIntrinsicHeight();

items.add(new OverlayItem(getPoint(40.748963847316034,
-73.96807193756104), "UN", "United Nations"));
items.add(new OverlayItem(getPoint(40.76866299974387,
-73.98268461227417), "Lincoln Center",
"Home of Jazz at Lincoln Center"));
items.add(new OverlayItem(getPoint(40.765136435316755,
-73.97989511489868), "Carnegie Hall",
"Where you go with practice, practice, practice"));
items.add(new OverlayItem(getPoint(40.70686417491799,
-74.01572942733765), "The Downtown Club",
"Original home of the Heisman Trophy"));

bitMap = BitmapFactory.decodeResource(getResources(),
R.drawable.mekr);
populate();
}

@Override
protected OverlayItem createItem(int i) {
return (items.get(i));
}

@Override
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
super.draw(canvas, mapView, shadow);

boundCenterBottom(marker);
}

@Override
public int size() {
return (items.size());
}

public void refresh() {
populate();
}

public void clear() {
items.clear();
resetLastFocuesIndex();
}

public void resetLastFocuesIndex() {
setLastFocusedIndex(-1);
selectedIndex = -1;
}

@Override
protected boolean onTap(final int index) {
if ( isPinch ){
return false;
}else{
// getMapView().setOnTouchListener(new OnTouchListener() {
// @Override
// public boolean onTouch(View arg0, MotionEvent arg1) {
// if (!items.isEmpty()) {
// if (view != null) {
// view.setVisibility(View.GONE);
// getMapView().invalidate();
// }
// }
// getMapView().invalidate();
// return true;
// }
// });
if (view != null) {
view.setVisibility(View.GONE);
getMapView().removeView(view);
getMapView().invalidate();
flag = false;
view = null;
}
view = getLayoutInflater().inflate(R.layout.balloon_overlay, null);
LinearLayout layout = (LinearLayout) view
.findViewById(R.id.balloon_main_layout);
layout.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
view.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
view.setBackgroundResource(R.drawable.balloon_overlay_bg_selector);
ImageView image = (ImageView) view
.findViewById(R.id.balloon_disclosure);
TextView text = (TextView) view
.findViewById(R.id.balloon_item_title);
text.setText(items.get(index).getTitle());

if (items.get(index).getTitle() != null
&& items.get(index).getTitle().equals("Me") == false) {
image.setImageResource(R.drawable.mekr);
}

Projection projection = getMapView().getProjection();
Point point = new Point();
projection.toPixels(items.get(index).getPoint(), point);

int x = (int) (view.getWidth() / 2f);
int y = -bitMap.getHeight() - 3;

MapView.LayoutParams lp = new MapView.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT, items.get(index)
.getPoint(), x, y,
MapView.LayoutParams.BOTTOM_CENTER);
getMapView().removeView(view);
getMapView().invalidate();
getMapView().addView(view, lp);
getMapView().invalidate();

view.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
if (!items.isEmpty()) {
if (view != null) {
view.setVisibility(View.GONE);
getMapView().invalidate();
}
}
getMapView().invalidate();
}
});
selectedIndex = index;
return true;
}
}

@Override
public boolean onTouchEvent(MotionEvent event, MapView mapView) {
final int action = event.getAction();
final int x = (int) event.getX();
final int y = (int) event.getY();
boolean result = false;

if (action == MotionEvent.ACTION_DOWN) {
for (OverlayItem item : items) {
Point p = new Point(0, 0);

map.getProjection().toPixels(item.getPoint(), p);

if (hitTest(item, marker, x - p.x, y - p.y)) {
result = true;
inDrag = item;
items.remove(inDrag);
populate();

xDragTouchOffset = 0;
yDragTouchOffset = 0;

setDragImagePosition(p.x, p.y);
dragImage.setVisibility(View.VISIBLE);

xDragTouchOffset = x - p.x;
yDragTouchOffset = y - p.y;
isPinch=false;
break;
}
}
} else if (action == MotionEvent.ACTION_MOVE && inDrag != null) {

if (view != null) {
if (view.getVisibility() != 0) {
Log.e("touch", " out move");
setDragImagePosition(x, y);
result = true;
isPinch=true;
}else{
setDragImagePosition(x, y);
isPinch=false;
}
}else{
setDragImagePosition(x, y);
result = true;
isPinch=true;
}
} else if (action == MotionEvent.ACTION_UP && inDrag != null) {
dragImage.setVisibility(View.GONE);

GeoPoint pt = map.getProjection().fromPixels(
x - xDragTouchOffset, y - yDragTouchOffset);
OverlayItem toDrop = new OverlayItem(pt, inDrag.getTitle(),
inDrag.getSnippet());

Log.e("touch", " out last" + pt.getLatitudeE6());
items.add(toDrop);
populate();
inDrag = null;
result = true;
isPinch = false;
}
return (isPinch || super.onTouchEvent(event,mapView));
}

private void setDragImagePosition(int x, int y) {
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams) dragImage.getLayoutParams();

lp.setMargins(x - xDragImageOffset - xDragTouchOffset, y
- yDragImageOffset - yDragTouchOffset, 0, 0);
dragImage.setLayoutParams(lp);
}
}
}
Here as shown in image that first one in which user can drag and drop pin.