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java.lang.Objectcom.google.android.maps.Overlay
public abstract class Overlay
Base class representing an overlay which may be displayed on top of a map. To
add an overlay, subclass this class, create an instance, and add it to the
list obtained from MapView.getOverlays().
In order to allow a user's touch to snap to a point, the subclass should
implement the Overlay.Snappable interface.
| Nested Class Summary | |
|---|---|
static interface |
Overlay.Snappable
Interface definition for overlays that contain items that can be snapped to (for example, when the user invokes a zoom, this could be called allowing the user to snap the zoom to an interesting point.) |
| Field Summary | |
|---|---|
protected static float |
SHADOW_X_SKEW
X Skew value for creating a marker shadow in perspective. |
protected static float |
SHADOW_Y_SCALE
Y Scale value for creating a marker shadow in perspective. |
| Constructor Summary | |
|---|---|
Overlay()
|
|
| Method Summary | |
|---|---|
void |
draw(android.graphics.Canvas canvas,
MapView mapView,
boolean shadow)
Draw the overlay over the map. |
boolean |
draw(android.graphics.Canvas canvas,
MapView mapView,
boolean shadow,
long when)
Draw call for animated overlays. |
protected static void |
drawAt(android.graphics.Canvas canvas,
android.graphics.drawable.Drawable drawable,
int x,
int y,
boolean shadow)
Convenience method to draw a Drawable at an offset. |
boolean |
onKeyDown(int keyCode,
android.view.KeyEvent event,
MapView mapView)
Handle a key down event. |
boolean |
onKeyUp(int keyCode,
android.view.KeyEvent event,
MapView mapView)
Handle a key up event. |
boolean |
onTap(GeoPoint p,
MapView mapView)
Handle a "tap" event. |
boolean |
onTouchEvent(android.view.MotionEvent e,
MapView mapView)
Handle a touch event. |
boolean |
onTrackballEvent(android.view.MotionEvent event,
MapView mapView)
Handle a trackball event. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
|---|
protected static final float SHADOW_X_SKEW
protected static final float SHADOW_Y_SCALE
| Constructor Detail |
|---|
public Overlay()
| Method Detail |
|---|
protected static void drawAt(android.graphics.Canvas canvas,
android.graphics.drawable.Drawable drawable,
int x,
int y,
boolean shadow)
MapView.getProjection()
method on the MapView passed to you in draw(Canvas, MapView, boolean).
shadow - If true, draw only the drawable's shadow. Otherwise,
draw the drawable itself.
public boolean onTouchEvent(android.view.MotionEvent e,
MapView mapView)
e - The motion event.mapView - the MapView that generated the touch event
public boolean onTrackballEvent(android.view.MotionEvent event,
MapView mapView)
event - The motion event.mapView - the MapView that generated the trackball event
public boolean onKeyDown(int keyCode,
android.view.KeyEvent event,
MapView mapView)
keyCode - The key code.event - The key event.mapView - the MapView that generated the key event
public boolean onKeyUp(int keyCode,
android.view.KeyEvent event,
MapView mapView)
keyCode - The key codeevent - The key eventmapView - the MapView that generated the key event
public boolean onTap(GeoPoint p,
MapView mapView)
p - The point that has been tapped.mapView - the MapView that generated the tap event
public void draw(android.graphics.Canvas canvas,
MapView mapView,
boolean shadow)
canvas - The Canvas upon which to draw. Note that this
may already have a transformation applied, so be sure to leave
it the way you found it.mapView - the MapView that requested the draw. Use MapView.getProjection() to convert between on-screen pixels and
latitude/longitude pairs.shadow - If true, draw the shadow layer. If false, draw the
overlay contents.
public boolean draw(android.graphics.Canvas canvas,
MapView mapView,
boolean shadow,
long when)
draw(Canvas, MapView, boolean) and returns false.
canvas - The Canvas upon which to draw. Note that this
may already have a transformation applied, so be sure to leave
it the way you found it.mapView - the MapView that requested the draw. Use MapView.getProjection() to convert between on-screen pixels and
latitude/longitude pairs.shadow - If true, draw the shadow layer. If false, draw the
overlay contents.when - The timestamp of the draw.
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