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Showing content from https://developers.google.com/maps/documentation/android-sdk/marker below:

Markers | Maps SDK for Android

Markers identify locations on the map. The default marker uses a standard icon, common to the Google Maps look and feel. It's possible to change the icon's color, image or anchor point via the API. Markers are objects of type Marker, and are added to the map with the GoogleMap.addMarker(markerOptions) method.

Markers are designed to be interactive. They receive click events by default, and are often used with event listeners to bring up info windows. Setting a marker's draggable property to true allows the user to change the position of the marker. Use a long press to activate the ability to move the marker.

By default, when a user taps a marker, the map toolbar appears at the bottom right of the map, giving the user quick access to the Google Maps mobile app. You can disable the toolbar. For more information, see the guide to controls.

The following example demonstrates how to add a marker to a map. The marker is created at coordinates -33.852,151.211 (Sydney, Australia), and displays the string 'Marker in Sydney' in an info window when clicked.

override fun onMapReady(googleMap: GoogleMap) {
    // Add a marker in Sydney, Australia,
    // and move the map's camera to the same location.
    val sydney = LatLng(-33.852, 151.211)
    googleMap.addMarker(
        MarkerOptions()
            .position(sydney)
            .title("Marker in Sydney")
    )
    googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney))
}

      

@Override
public void onMapReady(GoogleMap googleMap) {
    // Add a marker in Sydney, Australia,
    // and move the map's camera to the same location.
    LatLng sydney = new LatLng(-33.852, 151.211);
    googleMap.addMarker(new MarkerOptions()
        .position(sydney)
        .title("Marker in Sydney"));
    googleMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}

      

A common requirement is to show additional information about a place or location when the user taps a marker on the map. See the guide to info windows.

You can store an arbitrary data object with a marker using Marker.setTag(), and retrieve the data object using Marker.getTag(). The sample below shows how you can count the number of times a marker has been clicked using tags:

/**
 * A demo class that stores and retrieves data objects with each marker.
 */
class MarkerDemoActivity : AppCompatActivity(),
    OnMarkerClickListener, OnMapReadyCallback {
    private val PERTH = LatLng(-31.952854, 115.857342)
    private val SYDNEY = LatLng(-33.87365, 151.20689)
    private val BRISBANE = LatLng(-27.47093, 153.0235)

    private var markerPerth: Marker? = null
    private var markerSydney: Marker? = null
    private var markerBrisbane: Marker? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_markers)
        val mapFragment =
            supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment?
        mapFragment!!.getMapAsync(this)
    }

    /** Called when the map is ready.  */
    override fun onMapReady(map: GoogleMap) {
        // Add some markers to the map, and add a data object to each marker.
        markerPerth = map.addMarker(
            MarkerOptions()
                .position(PERTH)
                .title("Perth")
        )
        markerPerth?.tag = 0
        markerSydney = map.addMarker(
            MarkerOptions()
                .position(SYDNEY)
                .title("Sydney")
        )
        markerSydney?.tag = 0
        markerBrisbane = map.addMarker(
            MarkerOptions()
                .position(BRISBANE)
                .title("Brisbane")
        )
        markerBrisbane?.tag = 0

        // Set a listener for marker click.
        map.setOnMarkerClickListener(this)
    }

    /** Called when the user clicks a marker.  */
    override fun onMarkerClick(marker: Marker): Boolean {

        // Retrieve the data from the marker.
        val clickCount = marker.tag as? Int

        // Check if a click count was set, then display the click count.
        clickCount?.let {
            val newClickCount = it + 1
            marker.tag = newClickCount
            Toast.makeText(
                this,
                "${marker.title} has been clicked $newClickCount times.",
                Toast.LENGTH_SHORT
            ).show()
        }

        // Return false to indicate that we have not consumed the event and that we wish
        // for the default behavior to occur (which is for the camera to move such that the
        // marker is centered and for the marker's info window to open, if it has one).
        return false
    }
}

      

/**
 * A demo class that stores and retrieves data objects with each marker.
 */
public class MarkerDemoActivity extends AppCompatActivity implements
    GoogleMap.OnMarkerClickListener,
    OnMapReadyCallback {

    private final LatLng PERTH = new LatLng(-31.952854, 115.857342);
    private final LatLng SYDNEY = new LatLng(-33.87365, 151.20689);
    private final LatLng BRISBANE = new LatLng(-27.47093, 153.0235);

    private Marker markerPerth;
    private Marker markerSydney;
    private Marker markerBrisbane;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_markers);
        SupportMapFragment mapFragment =
            (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    /** Called when the map is ready. */
    @Override
    public void onMapReady(GoogleMap map) {
        // Add some markers to the map, and add a data object to each marker.
        markerPerth = map.addMarker(new MarkerOptions()
            .position(PERTH)
            .title("Perth"));
        markerPerth.setTag(0);

        markerSydney = map.addMarker(new MarkerOptions()
            .position(SYDNEY)
            .title("Sydney"));
        markerSydney.setTag(0);

        markerBrisbane = map.addMarker(new MarkerOptions()
            .position(BRISBANE)
            .title("Brisbane"));
        markerBrisbane.setTag(0);

        // Set a listener for marker click.
        map.setOnMarkerClickListener(this);
    }

    /** Called when the user clicks a marker. */
    @Override
    public boolean onMarkerClick(final Marker marker) {

        // Retrieve the data from the marker.
        Integer clickCount = (Integer) marker.getTag();

        // Check if a click count was set, then display the click count.
        if (clickCount != null) {
            clickCount = clickCount + 1;
            marker.setTag(clickCount);
            Toast.makeText(this,
                marker.getTitle() +
                    " has been clicked " + clickCount + " times.",
                Toast.LENGTH_SHORT).show();
        }

        // Return false to indicate that we have not consumed the event and that we wish
        // for the default behavior to occur (which is for the camera to move such that the
        // marker is centered and for the marker's info window to open, if it has one).
        return false;
    }
}

      

Here are some examples of scenarios when it's useful to store and retrieve data with markers:

• Your app may cater for different types of markers, and you want to treat them differently when the user clicks them. To accomplish this, you can store a String with the marker indicating the type.
• You may be interfacing with a system that has unique record identifiers, where the markers represent specific records in that system.
• Marker data may indicate a priority to be used when deciding the z-index of a marker.

You can reposition a marker once its been added to the map so long as its draggable property is set to true. Long press the marker to enable dragging. When you take your finger off the screen, the marker will remain in that position.

Markers are not draggable by default. You must explicitly set the marker to be draggable either with MarkerOptions.draggable(boolean) prior to adding it to the map, or Marker.setDraggable(boolean) once it has been added to the map. You can listen for drag events on the marker, as described in Marker drag events.

The below snippet adds a draggable marker at Perth, Australia.

val perthLocation = LatLng(-31.90, 115.86)
val perth = map.addMarker(
    MarkerOptions()
        .position(perthLocation)
        .draggable(true)
)

      

final LatLng perthLocation = new LatLng(-31.90, 115.86);
Marker perth = map.addMarker(
    new MarkerOptions()
        .position(perthLocation)
        .draggable(true));

      

This video shows ways of using markers to visualize locations on a map.

Markers may define a custom image to show in place of the default icon. Defining an icon involves setting a number of properties that affect the visual behavior of the marker.

Markers support customization through the following properties:

Position (Required)

The LatLng value for the marker's position on the map. This is the only required property for a Marker object.

Anchor

The point on the image that will be placed at the LatLng position of the marker. This defaults to the middle of the bottom of the image.

Alpha

Sets the opacity of the marker. Defaults to 1.0.

Title

A string that's displayed in the info window when the user taps the marker.

Snippet

Additional text that's displayed below the title.

Icon

A bitmap that's displayed in place of the default marker image.

Draggable

Set to true if you want to allow the user to move the marker. Defaults to false.

Visible

Set to false to make the marker invisible. Defaults to true.

Flat or Billboard orientation

By default, markers use a billboard orientation, meaning they are drawn oriented against the device's screen rather than against the map's surface. Rotating, tilting, or zooming the map does not change the orientation of the marker. You can set the orientation of a marker to be flat against the earth. Flat markers rotate when the map is rotated, and change perspective when the map is tilted. As with billboard markers, flat markers retain their size when the map is zoomed in or out.

Rotation

The orientation of the marker, specified in degrees clockwise. The default position changes if the marker is flat. The default position for a flat marker is north aligned. When the marker is not flat, the default position is pointing up and the rotation is such that the marker is always facing the camera.

The below snippet creates a simple marker, with the default icon.

val melbourneLocation = LatLng(-37.813, 144.962)
val melbourne = map.addMarker(
    MarkerOptions()
        .position(melbourneLocation)
)

      

final LatLng melbourneLocation = new LatLng(-37.813, 144.962);
Marker melbourne = map.addMarker(
    new MarkerOptions()
        .position(melbourneLocation));

      

It's possible to customize the color of the default marker image by passing a BitmapDescriptor object to the icon() method. You can use a set of predefined colors in the BitmapDescriptorFactory object, or set a custom marker color with the BitmapDescriptorFactory.defaultMarker(float hue) method. The hue is a value between 0 and 360, representing points on a color wheel.

val melbourneLocation = LatLng(-37.813, 144.962)
val melbourne = map.addMarker(
    MarkerOptions()
        .position(melbourneLocation)
        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE))
)

      

final LatLng melbourneLocation = new LatLng(-37.813, 144.962);
Marker melbourne = map.addMarker(
    new MarkerOptions()
        .position(melbourneLocation)
        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));

      

You can control the opacity of a marker with the MarkerOptions.alpha() method. Alpha should be specified as a float between 0.0 and 1.0, where 0 is fully transparent and 1 is fully opaque.

val melbourneLocation = LatLng(-37.813, 144.962)
val melbourne = map.addMarker(
    MarkerOptions()
        .position(melbourneLocation)
        .alpha(0.7f)
)

      

final LatLng melbourneLocation = new LatLng(-37.813, 144.962);
Marker melbourne = map.addMarker(new MarkerOptions()
    .position(melbourneLocation)
    .alpha(0.7f));

      

You can replace the default marker image with a custom marker image, often called an icon. Custom icons are always set as a BitmapDescriptor, and defined using one of the methods in the BitmapDescriptorFactory class.

fromAsset(String assetName)

Creates a custom marker using the name of a Bitmap image in the assets directory.

fromBitmap(Bitmap image)

Creates a custom marker from a Bitmap image.

fromFile(String fileName)

Creates a custom icon using the name of a Bitmap image file located in the internal storage.

fromPath(String absolutePath)

Creates a custom marker from an absolute file path of a Bitmap image.

fromResource(int resourceId)

Creates a custom marker using the resource ID of a Bitmap image.

The below snippet creates a marker with a custom icon.

val melbourneLocation = LatLng(-37.813, 144.962)
val melbourne = map.addMarker(
    MarkerOptions()
        .position(melbourneLocation)
        .title("Melbourne")
        .snippet("Population: 4,137,400")
        .icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow))
)

      

final LatLng melbourneLocation = new LatLng(-37.813, 144.962);
Marker melbourne = map.addMarker(
    new MarkerOptions()
        .position(melbourneLocation)
        .title("Melbourne")
        .snippet("Population: 4,137,400")
        .icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow)));

      

Marker icons are normally drawn with respect to the screen; rotating, tilting or zooming the map will not change the orientation of the marker. You can set the orientation of a marker to be flat against the earth. Markers that are oriented in this way will rotate when the map is rotated, and change perspective when the map is tilted. Flat markers will retain their size when the map is zoomed in or out.

To change the orientation of the marker, set the marker's flat property to true.

val perthLocation = LatLng(-31.90, 115.86)
val perth = map.addMarker(
    MarkerOptions()
        .position(perthLocation)
        .flat(true)
)

      

final LatLng perthLocation = new LatLng(-31.90, 115.86);
Marker perth = map.addMarker(
    new MarkerOptions()
        .position(perthLocation)
        .flat(true));

      

You can rotate a marker around its anchor point with the Marker.setRotation() method. The rotation is measured in degrees clockwise from the default position. When the marker is flat on the map, the default position is North. When the marker is not flat, the default position is pointing up and the rotation is such that the marker is always facing the camera.

The below example rotates the marker 90°. Setting the anchor point to 0.5,0.5 causes the marker to be rotated around its center, instead of its base.

val perthLocation = LatLng(-31.90, 115.86)
val perth = map.addMarker(
    MarkerOptions()
        .position(perthLocation)
        .anchor(0.5f, 0.5f)
        .rotation(90.0f)
)

      

final LatLng perthLocation = new LatLng(-31.90, 115.86);
Marker perth = map.addMarker(
    new MarkerOptions()
        .position(perthLocation)
        .anchor(0.5f,0.5f)
        .rotation(90.0f));

      

The z-index specifies the stack order of this marker, relative to other markers on the map. A marker with a high z-index is drawn on top of markers with lower z-indexes. The default z-index value is 0.

Set the z-index on the marker's options object by calling MarkerOptions.zIndex(), as shown in the following code snippet:

map.addMarker(
    MarkerOptions()
        .position(LatLng(10.0, 10.0))
        .title("Marker z1")
        .zIndex(1.0f)
)

      

map.addMarker(new MarkerOptions()
    .position(new LatLng(10, 10))
    .title("Marker z1")
    .zIndex(1.0f));

      

You can access the marker's z-index by calling Marker.getZIndex(), and you can change it by calling Marker.setZIndex().

Markers are always drawn above tile layers and other non-marker overlays (ground overlays, polylines, polygons, and other shapes) regardless of the z-index of the other overlays. Markers are effectively considered to be in a separate z-index group compared to other overlays.

Read about the effect of z-index on click events below.

The Maps API allows you to listen and respond to marker events. To listen to these events, you must set the corresponding listener on the GoogleMap object to which the markers belong. When the event occurs on one of the markers on the map, the listener's callback will be invoked with the corresponding Marker object passed through as a parameter. To compare this Marker object with your own reference to a Marker object, you must use equals() and not ==.

You can listen to the following events:

• Marker click events
• Marker drag events
• Info window click events

You can use an OnMarkerClickListener to listen for click events on the marker. To set this listener on the map, call GoogleMap.setOnMarkerClickListener(OnMarkerClickListener). When a user clicks on a marker, onMarkerClick(Marker) will be called and the marker will be passed through as an argument. This method returns a boolean that indicates whether you have consumed the event (i.e., you want to suppress the default behavior). If it returns false, then the default behavior will occur in addition to your custom behavior. The default behavior for a marker click event is to show its info window (if available) and move the camera such that the marker is centered on the map.

Effect of z-index on click events:

• When a user clicks on a cluster of markers, the click event is triggered for the marker with the highest z-index.
• At most one event is triggered per click. In other words, the click is not passed down to the markers or other overlays with lower z-index values.
• Clicking on a cluster of markers causes subsequent clicks to cycle through the cluster, selecting each in turn. The order of the cycle first prioritises z-index, then proximity to the click point.
• If the user clicks outside the proximity of the cluster, the API recalculates the cluster and resets the state of the click cycle so that it starts from the beginning.
• Markers are effectively considered to be in a separate z-index group compared to other overlays or shapes (polylines, polygons, circles, and/or ground overlays), regardless of the z-index of the other overlays. If multiple markers, overlays or shapes are overlaid on top of each other, the click event is cycled through the cluster of markers first.

You can use an OnMarkerDragListener to listen for drag events on a marker. To set this listener on the map, call GoogleMap.setOnMarkerDragListener. To drag a marker, a user must long press on the marker. When the user takes their finger off the screen, the marker will stay in that position. When a marker is dragged, onMarkerDragStart(Marker) is called initially. While the marker is being dragged, onMarkerDrag(Marker) is called constantly. At the end of the drag onMarkerDragEnd(Marker) is called. You can get the position of the marker at any time by calling Marker.getPosition().

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