Marker

public final class Marker extends Object

An icon placed at a particular point on the map's surface. A marker icon is drawn oriented against the device's screen rather than the map's surface; i.e., it will not necessarily change orientation due to map rotations, tilting, or zooming.

A marker has the following properties:

Alpha
Sets the opacity of the marker. Defaults to 1.0.
Anchor
The point on the image that will be placed at the LatLng position of the marker. This defaults to 50% from the left of the image and at the bottom of the image.
Position
The LatLng value for the marker's position on the map. You can change this value at any time if you want to move the marker.
Title
A text string that's displayed in an info window when the user taps the marker. You can change this value at any time.
Snippet
Additional text that's displayed below the title. You can change this value at any time.
Icon
A bitmap that's displayed for the marker. If the icon is left unset, a default icon is displayed. You can specify an alternative coloring of the default icon using defaultMarker(float).
Drag Status
If you want to allow the user to drag the marker, set this property to true. You can change this value at any time. The default is false.
Visibility
By default, the marker is visible. To make the marker invisible, set this property to false. You can change this value at any time.
Flat or Billboard
If the marker is flat against the map, it will remain stuck to the map as the camera rotates and tilts but will still remain the same size as the camera zooms, unlike a GroundOverlay. If the marker is a billboard, it will always be drawn facing the camera and will rotate and tilt with the camera. The default is a billboard (false)
Rotation
The rotation of the marker in degrees clockwise about the marker's anchor point. The axis of rotation is perpendicular to the marker. A rotation of 0 corresponds to the default position of the marker. When the marker is flat on the map, the default position is North aligned and the rotation is such that the marker always remains flat on the map. When the marker is a billboard, the default position is pointing up and the rotation is such that the marker is always facing the camera. The default value is 0.
zIndex
The draw order for the marker. The markers are drawn in order of the zIndex, with the highest zIndex marker drawn on top. By setting the zIndex property for each marker, you can control which tap target your user is most likely to hit. The default value is 0.
Tag
An Object associated with the marker. For example, the Object can contain data about what the marker represents. This is easier than storing a separate Map<Marker, Object>. As another example, you can associate a String ID corresponding to the ID from a data set. Google Maps Android API neither reads nor writes this property.

Methods in this class must be called on the Android UI thread. If not, an IllegalStateException will be thrown at runtime.

Example

GoogleMap map = ... // get a map.
 // Add a marker at San Francisco.
 Marker marker = map.addMarker(new MarkerOptions()
     .position(new LatLng(37.7750, 122.4183))
     .title("San Francisco")
     .snippet("Population: 776733"));
 

Developer Guide

For more information, read the Markers developer guide.

Public Method Summary

boolean
equals(Object other)
Tests if this Marker is equal to another.
float
getAlpha()
Gets the alpha of the marker.
String
getId()
Gets this marker's id.
LatLng
getPosition()
Returns the position of the marker.
float
getRotation()
Gets the rotation of the marker.
String
getSnippet()
Gets the snippet of the marker.
Object
getTag()
Gets the tag for the marker.
String
getTitle()
Gets the title of the marker.
float
getZIndex()
Returns the zIndex of the marker.
int
void
hideInfoWindow()
Hides the info window if it is shown from this marker.
boolean
isDraggable()
Gets the draggability of the marker.
boolean
isFlat()
Gets the flat setting of the Marker.
boolean
isInfoWindowShown()
Returns whether the info window is currently shown above this marker.
boolean
isVisible()
Gets the visibility setting of this marker.
void
remove()
Removes this marker from the map.
void
setAlpha(float alpha)
Sets the alpha (opacity) of the marker.
void
setAnchor(float anchorU, float anchorV)
Sets the anchor point for the marker.
void
setDraggable(boolean draggable)
Sets the draggability of the marker.
void
setFlat(boolean flat)
Sets whether this marker should be flat against the map true or a billboard facing the camera false.
void
setIcon(BitmapDescriptor iconDescriptor)
Sets the icon for the marker.
void
setInfoWindowAnchor(float anchorU, float anchorV)
Specifies the point in the marker image at which to anchor the info window when it is displayed.
void
setPosition(LatLng latlng)
Sets the location of the marker.
void
setRotation(float rotation)
Sets the rotation of the marker in degrees clockwise about the marker's anchor point.
void
setSnippet(String snippet)
Sets the snippet of the marker.
void
setTag(Object tag)
Sets the tag for the marker.
void
setTitle(String title)
Sets the title of the marker.
void
setVisible(boolean visible)
Sets the visibility of this marker.
void
setZIndex(float zIndex)
Sets the zIndex of the marker.
void
showInfoWindow()
Shows the info window of this marker on the map, if this marker isVisible().

Inherited Method Summary

Public Methods

public boolean equals (Object other)

Tests if this Marker is equal to another.

Parameters
other an Object.
Returns
  • true if both objects are the same object, that is, this == other.

public float getAlpha ()

Gets the alpha of the marker.

Returns
  • the alpha of the marker in the range [0, 1].

public String getId ()

Gets this marker's id. The id will be unique amongst all Markers on a map.

Returns
  • this marker's id.

public LatLng getPosition ()

Returns the position of the marker.

Returns
  • A LatLng object specifying the marker's current position.

public float getRotation ()

Gets the rotation of the marker.

Returns
  • the rotation of the marker in degrees clockwise from the default position.

public String getSnippet ()

Gets the snippet of the marker.

Returns
  • A string containing the marker's snippet.

public Object getTag ()

Gets the tag for the marker.

Returns
  • the tag if a tag was set with setTag; null if no tag has been set.

public String getTitle ()

Gets the title of the marker.

Returns
  • A string containing the marker's title.

public float getZIndex ()

Returns the zIndex of the marker.

Returns
  • this marker's zIndex.

public int hashCode ()

public void hideInfoWindow ()

Hides the info window if it is shown from this marker.

This method has no effect if this marker is not visible.

public boolean isDraggable ()

Gets the draggability of the marker. When a marker is draggable, it can be moved by the user by long pressing on the marker.

Returns
  • true if the marker is draggable; otherwise, returns false.

public boolean isFlat ()

Gets the flat setting of the Marker.

Returns
  • true if the marker is flat against the map; false if the marker should face the camera.

public boolean isInfoWindowShown ()

Returns whether the info window is currently shown above this marker. This does not consider whether or not the info window is actually visible on screen.

public boolean isVisible ()

Gets the visibility setting of this marker. Note that this does not indicate whether the marker is within the screen's viewport. It indicates whether the marker will be drawn if it is contained in the screen's viewport.

Returns
  • this marker's visibility.

public void remove ()

Removes this marker from the map. After a marker has been removed, the behavior of all its methods is undefined.

public void setAlpha (float alpha)

Sets the alpha (opacity) of the marker. This is a value from 0 to 1, where 0 means the marker is completely transparent and 1 means the marker is completely opaque.

public void setAnchor (float anchorU, float anchorV)

Sets the anchor point for the marker.

The anchor specifies the point in the icon image that is anchored to the marker's position on the Earth's surface.

The anchor point is specified in the continuous space [0.0, 1.0] x [0.0, 1.0], where (0, 0) is the top-left corner of the image, and (1, 1) is the bottom-right corner. The anchoring point in a W x H image is the nearest discrete grid point in a (W + 1) x (H + 1) grid, obtained by scaling the then rounding. For example, in a 4 x 2 image, the anchor point (0.7, 0.6) resolves to the grid point at (3, 1).

 *-----+-----+-----+-----*
 |     |     |     |     |
 |     |     |     |     |
 +-----+-----+-----+-----+
 |     |     |   X |     |   (U, V) = (0.7, 0.6)
 |     |     |     |     |
 *-----+-----+-----+-----*

 *-----+-----+-----+-----*
 |     |     |     |     |
 |     |     |     |     |
 +-----+-----+-----X-----+   (X, Y) = (3, 1)
 |     |     |     |     |
 |     |     |     |     |
 *-----+-----+-----+-----*
 
Parameters
anchorU u-coordinate of the anchor, as a ratio of the image width (in the range [0, 1]).
anchorV v-coordinate of the anchor, as a ratio of the image height (in the range [0, 1]).

public void setDraggable (boolean draggable)

Sets the draggability of the marker. When a marker is draggable, it can be moved by the user by long pressing on the marker.

public void setFlat (boolean flat)

Sets whether this marker should be flat against the map true or a billboard facing the camera false.

public void setIcon (BitmapDescriptor iconDescriptor)

Sets the icon for the marker.

Parameters
iconDescriptor if null, the default marker is used.

public void setInfoWindowAnchor (float anchorU, float anchorV)

Specifies the point in the marker image at which to anchor the info window when it is displayed. This is specified in the same coordinate system as the anchor. See setAnchor(float, float) for more details. The default is the top middle of the image.

Parameters
anchorU u-coordinate of the info window anchor, as a ratio of the image width (in the range [0, 1]).
anchorV v-coordinate of the info window anchor, as a ratio of the image height (in the range [0, 1]).

public void setPosition (LatLng latlng)

Sets the location of the marker.

public void setRotation (float rotation)

Sets the rotation of the marker in degrees clockwise about the marker's anchor point. The axis of rotation is perpendicular to the marker. A rotation of 0 corresponds to the default position of the marker.

public void setSnippet (String snippet)

Sets the snippet of the marker.

Parameters
snippet if null, the snippet is cleared.

public void setTag (Object tag)

Sets the tag for the marker.

You can use this property to associate an arbitrary Object with this marker. For example, the Object can contain data about what the marker represents. This is easier than storing a separate Map<Marker, Object>. As another example, you can associate a String ID corresponding to the ID from a data set. Google Maps Android API neither reads nor writes this property. It is your responsibility to call setTag(null) to clear the tag when you no longer need it, to prevent memory leaks in your app.

Parameters
tag if null, the tag is cleared.

public void setTitle (String title)

Sets the title of the marker.

Parameters
title if null, the title is cleared.

public void setVisible (boolean visible)

Sets the visibility of this marker. If set to false and an info window is currently showing for this marker, this will hide the info window.

public void setZIndex (float zIndex)

Sets the zIndex of the marker.

public void showInfoWindow ()

Shows the info window of this marker on the map, if this marker isVisible().

Throws
IllegalArgumentException if marker is not on this map