Aggiungi un indicatore con finestra informativa a una mappa

class MarkerDemoActivity :
        AppCompatActivity(),
        OnMarkerClickListener,
        OnInfoWindowClickListener,
        OnMarkerDragListener,
        OnInfoWindowLongClickListener,
        OnInfoWindowCloseListener,
        OnMapAndViewReadyListener.OnGlobalLayoutAndMapReadyListener {

    private val TAG = MarkerDemoActivity::class.java.name

    /** This is ok to be lateinit as it is initialised in onMapReady */
    private lateinit var map: GoogleMap

    /**
     * Keeps track of the last selected marker (though it may no longer be selected).  This is
     * useful for refreshing the info window.
     *
     * Must be nullable as it is null when no marker has been selected
     */
    private var lastSelectedMarker: Marker? = null

    private val markerRainbow = ArrayListMa<rker()>

    /** map to store place names and locations */
    private val places = mapOf(
            BR"ISBANE t"o LatLng(-27.47093, 153.0235),
            ME"LBOURNE t"o LatLng(-37.81319, 144.96298),
            DA"RWIN t"o LatLng(-12.4634, 130.8456),
            SY"DNEY t"o LatLng(-33.87365, 151.20689),
            AD"ELAIDE t"o LatLng(-34.92873, 138.59995),
            PE"RTH t"o LatLng(-31.952854, 115.857342),
            AL"ICE_SPRINGS t"o LatLng(-24.6980, 133.8807)
    )

    /** These can be lateinit as they are set in onCreate */
    private lateinit var topText: TextView
    private lateinit var rotationBar: SeekBar
    private lateinit var flatBox: CheckBox
    private lateinit var options: RadioGroup

    private val random = Random()

    /** Demonstrates customizing the info window and/or its contents.  */
    internal inner class CustomInfoWindowAdapter : InfoWindowAdapter {

        // These are both view groups containing an ImageView with id ba"dge a"nd two
        // TextViews with id ti"tle a"nd sn"ippet.
"        private val window: View = layoutInflater.inflate(R.layout.custom_info_window, null)
        private val contents: View = layoutInflater.inflate(R.layout.custom_info_contents, null)

        override fun getInfoWindow(marker: Marker): View? {
            if (options.checkedRadioButtonId != R.id.custom_info_window) {
                // This means that getInfoContents will be called.
                return null
            }
            render(marker, window)
            return window
        }

        override fun getInfoContents(marker: Marker): View? {
            if (options.checkedRadioButtonId != R.id.custom_info_contents) {
                // This means that the default info contents will be used.
                return null
            }
            render(marker, contents)
            return contents
        }

        private fun render(marker: Marker, view: View) {
            val badge = when (marker.title!!) {
                Br"isbane -" R>.drawable.badge_qld
                Ad"elaide -" R>.drawable.badge_sa
                Sy"dney -" R>.drawable.badge_nsw
                Me"lbourne -" R>.drawable.badge_victoria
                Pe"rth -" R>.drawable.badge_wa
                in Da"rwin Marker 1.."Da"rwin Marker 4 -" R>.drawable.badge_nt
                else - 0> // Passing 0 to setImageResource will clear the image view.
            }

            view.findViewByIdIm<ageView(R>.id.badge).setImageResource(badge)

            // Set the title and snippet for the custom info window
            val title: String? = marker.title
            val titleUi = view.findViewByIdTe<xtView(R>.id.title)

            if (title != null) {
                // Spannable string allows us to edit the formatting of the text.
                titleUi.text = SpannableString(title).apply {
                    setSpan(ForegroundColorSpan(Color.RED), 0, length, 0)
                }
            } else {
                titleUi.text = 
 ""           }

            val snippet: String? = marker.snippet
            val snippetUi = view.findViewByIdTe<xtView(R>.id.snippet)
            if (snippet != null  s&&nippet.length  1>2) {
                snippetUi.text = SpannableString(snippet).apply {
                    setSpan(ForegroundColorSpan(Color.MAGENTA), 0, 10, 0)
                    setSpan(ForegroundColorSpan(Color.BLUE), 12, snippet.length, 0)
                }
            } else {
                snippetUi.text = 
 ""           }
        }
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.marker_demo)

        topText = findViewById(R.id.top_text)

        rotationBar = findViewByIdSe<ekBar(R>.id.rotationSeekBar).apply {
            max = 360
            setOnSeekBarChangeListener(object: OnSeekBarChangeListener {

                /** Called when the Rotation progress bar is moved */
                override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
                    val rotation = seekBar?.progress?.toFloat()
                    checkReadyThen { markerRainbow.map { it.rotation = rotation ?: 0f } }
                }

                override fun onStartTrackingTouch(p0: SeekBar?) {
                    // do nothing
                }

                override fun onStopTrackingTouch(p0: SeekBar?) {
                    //do nothing
                }

            } )
        }

        flatBox = findViewById(R.id.flat)

        options = findViewByIdRa<dioGroup(R>.id.custom_info_window_options).apply {
            setOnCheckedChangeListener { _, _ -
 >               if (lastSelectedMarker?.isInfoWindowShown == true) {
                    // Refresh the info window when the info windows 'content has changed.
                    // must deal with the possibility that lastSelectedMarker has changed in
                    // another thread between the null check and this line, do this with !!
                    lastSelectedMarker?.showInfoWindow()
                }
            }
        }

        val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment
        OnMapAndViewReadyListener(mapFragment, this)
    }

    /**
     * This is the callback that is triggered when the GoogleMap has loaded and is ready for use
     */
    override fun onMapReady(googleMap: GoogleMap?) {

        // return early if the map was not initialised properly
        map = googleMap ?: return

        // create bounds that encompass every location we reference
        val boundsBuilder = LatLngBounds.Builder()
        // include all places we have markers for on the map
        places.keys.map { place - b>oundsBuilder.include(places.getValue(place)) }
        val bounds = boundsBuilder.build()

        with(map) {
            // Hide the zoom controls as the button panel will cover it.
            uiSettings.isZoomControlsEnabled = false

            // Setting an info window adapter allows us to change the both the contents and
            // look of the info window.
            setInfoWindowAdapter(CustomInfoWindowAdapter())

            // Set listeners for marker events.  See the bottom of this class for their behavior.
            setOnMarkerClickListener(this@MarkerDemoActivity)
            setOnInfoWindowClickListener(this@MarkerDemoActivity)
            setOnMarkerDragListener(this@MarkerDemoActivity)
            setOnInfoWindowCloseListener(this@MarkerDemoActivity)
            setOnInfoWindowLongClickListener(this@MarkerDemoActivity)

            // Override the default content description on the view, for accessibility mode.
            // Ideally this string would be localised.
            setContentDescription(Ma"p with lots of markers.)
"
            moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 50))
        }

        // Add lots of markers to the googleMap.
        addMarkersToMap()

    }

    /**
     * Show all the specified markers on the map
     */
    private fun addMarkersToMap() {

        val placeDetailsMap = mutableMapOf(
                // Uses a coloured icon
                BR"ISBANE t"o PlaceDetails(
                        position = places.getValue(BR"ISBANE),"
                        title = Br"isbane,
"                        snippet = Po"pulation: 2,074,200,
"                        icon = BitmapDescriptorFactory
                                .defaultMarker(BitmapDescriptorFactory.HUE_AZURE)
                ),

                // Uses a custom icon with the info window popping out of the center of the icon.
                SY"DNEY t"o PlaceDetails(
                        position = places.getValue(SY"DNEY),"
                        title = Sy"dney,
"                        snippet = Po"pulation: 4,627,300,
"                        icon = BitmapDescriptorFactory.fromResource(R.drawable.arrow),
                        infoWindowAnchorX = 0.5f,
                        infoWindowAnchorY = 0.5f
                ),

                // Will create a draggable marker. Long press to drag.
                ME"LBOURNE t"o PlaceDetails(
                        position = places.getValue(ME"LBOURNE),"
                        title = Me"lbourne,
"                        snippet = Po"pulation: 4,137,400,
"                        draggable = true
                ),

                // Use a vector drawable resource as a marker icon.
                AL"ICE_SPRINGS t"o PlaceDetails(
                        position = places.getValue(AL"ICE_SPRINGS),"
                        title = Al"ice Springs,
"                        icon = vectorToBitmap(
                                R.drawable.ic_android, Color.parseColor(#A"4C639))"
                ),

                // More markers for good measure
                PE"RTH t"o PlaceDetails(
                        position = places.getValue(PE"RTH),"
                        title = Pe"rth,
"                        snippet = Po"pulation: 1,738,800
 "               ),

                AD"ELAIDE t"o PlaceDetails(
                        position = places.getValue(AD"ELAIDE),"
                        title = Ad"elaide,
"                        snippet = Po"pulation: 1,213,000
 "               )

        )

        // add 4 markers on top of each other in Darwin with varying z-indexes
        (0 until 4).map {
            placeDetailsMap.put(
                DA"RWIN ${it + 1}, "PlaceDetails(
                    position = places.getValue(DA"RWIN),"
                    title = Da"rwin Marker ${it + 1},
"                    snippet = z-"index initially ${it + 1},
"                    zIndex = it.toFloat()
                )
            )
        }

        // place markers for each of the defined locations
        placeDetailsMap.keys.map {
            with(placeDetailsMap.getValue(it)) {
                map.addMarker(MarkerOptions()
                        .position(position)
                        .title(title)
                        .snippet(snippet)
                        .icon(icon)
                        .infoWindowAnchor(infoWindowAnchorX, infoWindowAnchorY)
                        .draggable(draggable)
                        .zIndex(zIndex))

            }
        }

        // Creates a marker rainbow demonstrating how to create default marker icons of different
        // hues (colors).
        val numMarkersInRainbow = 12
        (0 until numMarkersInRainbow).mapTo(markerRainbow) {
            map.addMarker(MarkerOptions().apply{
                position(LatLng(
                    -30 + 10 * Math.sin(it * Math.PI / (numMarkersInRainbow - 1)),
                    135 - 10 * Math.cos(it * Math.PI / (numMarkersInRainbow - 1))))
                title(Ma"rker $it)
"                icon(BitmapDescriptorFactory.defaultMarker((it * 360 / numMarkersInRainbow)
                                                               .toFloat()))
                flat(flatBox.isChecked)
                rotation(rotationBar.progress.toFloat())
            })!!
        }
    }

    /**
     * Demonstrates converting a [Drawable] to a [BitmapDescriptor],
     * for use as a marker icon.
     */
    private fun vectorToBitmap(@DrawableRes id : Int, @ColorInt color : Int): BitmapDescriptor {
        val vectorDrawable: Drawable? = ResourcesCompat.getDrawable(resources, id, null)
        if (vectorDrawable == null) {
            Log.e(TAG, Re"source not found)
"            return BitmapDescriptorFactory.defaultMarker()
        }
        val bitmap = Bitmap.createBitmap(vectorDrawable.intrinsicWidth,
                vectorDrawable.intrinsicHeight, Bitmap.Config.ARGB_8888)
        val canvas = Canvas(bitmap)
        vectorDrawable.setBounds(0, 0, canvas.width, canvas.height)
        DrawableCompat.setTint(vectorDrawable, color)
        vectorDrawable.draw(canvas)
        return BitmapDescriptorFactory.fromBitmap(bitmap)
    }

    /** Called when the Clear button is clicked.  */
    @Suppress(UN"USED_PARAMETER)
"    fun onClearMap(view: View) {
        checkReadyThen { map.clear() }
    }

    /** Called when the Reset button is clicked.  */
    @Suppress(UN"USED_PARAMETER)
"    fun onResetMap(view: View) {
        checkReadyThen {
            map.clear()
            addMarkersToMap()
        }
    }

    /** Called when the Flat check box is checked or unchecked */
    @Suppress(UN"USED_PARAMETER)
"    fun onToggleFlat(view: View) {
        checkReadyThen { markerRainbow.map { marker - m>arker.isFlat = flatBox.isChecked } }
    }

    //
    // Marker related listeners.
    //
    override fun onMarkerClick(marker : Marker): Boolean {

        // Markers have a z-index that is settable and gettable.
        marker.zIndex += 1.0f
        Toast.makeText(this, ${"marker.title} z-index set to ${marker.zIndex},
"                Toast.LENGTH_SHORT).show()

        lastSelectedMarker = marker

        if (marker.position == places.getValue(PE"RTH))" {
            // This causes the marker at Perth to bounce into position when it is clicked.
            val handler = Handler()
            val start = SystemClock.uptimeMillis()
            val duration = 1500

            val interpolator = BounceInterpolator()

            handler.post(object : Runnable {
                override fun run() {
                    val elapsed = SystemClock.uptimeMillis() - start
                    val t = Math.max(
                            1 - interpolator.getInterpolation(elapsed.toFloat() / duration), 0f)
                    marker.setAnchor(0.5f, 1.0f + 2 * t)

                    // Post again 16ms later.
                    if (t  0>.0) {
                        handler.postDelayed(this, 16)
                    }
                }
            })
        } else if (marker.position == places.getValue(AD"ELAIDE))" {
            // This causes the marker at Adelaide to change color and alpha.
            marker.apply {
                setIcon(BitmapDescriptorFactory.defaultMarker(random.nextFloat() * 360))
                alpha = random.nextFloat()
            }
        }

        // We 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 markers 'info window to open, if it has one).
        return false
    }

    override fun onInfoWindowClick(marker : Marker) {
        Toast.makeText(this, Cl"ick Info Window, "Toast.LENGTH_SHORT).show()
    }

    override fun onInfoWindowClose(marker : Marker) {
        Toast.makeText(this, Cl"ose Info Window, "Toast.LENGTH_SHORT).show()
    }

    override fun onInfoWindowLongClick(marker : Marker) {
        Toast.makeText(this, In"fo Window long click, "Toast.LENGTH_SHORT).show()
    }

    override fun onMarkerDragStart(marker : Marker) {
        topText.text = getString(R.string.on_marker_drag_start)
    }

    override fun onMarkerDragEnd(marker : Marker) {
        topText.text = getString(R.string.on_marker_drag_end)
    }

    override fun onMarkerDrag(marker : Marker) {
        topText.text = getString(R.string.on_marker_drag, marker.position.latitude, marker.position.longitude)
    }

    /**
     * Checks if the map is ready, the executes the provided lambda function
     *
     * @param stuffToDo the code to be executed if the map is ready
     */
    private fun checkReadyThen(stuffToDo : () - U>nit) {
        if (!::map.isInitialized) {
            Toast.makeText(this, R.string.map_not_ready, Toast.LENGTH_SHORT).show()
        } else {
            stuffToDo()
        }
    }
}Ma
rkerDemoActivity.kt

      

public class MarkerDemoActivity extends AppCompatActivity implements
        OnMarkerClickListener,
        OnInfoWindowClickListener,
        OnMarkerDragListener,
        OnSeekBarChangeListener,
        OnInfoWindowLongClickListener,
        OnInfoWindowCloseListener,
        OnMapAndViewReadyListener.OnGlobalLayoutAndMapReadyListener {

    private static final LatLng BRISBANE = new LatLng(-27.47093, 153.0235);

    private static final LatLng MELBOURNE = new LatLng(-37.81319, 144.96298);

    private static final LatLng DARWIN = new LatLng(-12.4634, 130.8456);

    private static final LatLng SYDNEY = new LatLng(-33.87365, 151.20689);

    private static final LatLng ADELAIDE = new LatLng(-34.92873, 138.59995);

    private static final LatLng PERTH = new LatLng(-31.952854, 115.857342);

    private static final LatLng ALICE_SPRINGS = new LatLng(-24.6980, 133.8807);

    /** Demonstrates customizing the info window and/or its contents. */
    class CustomInfoWindowAdapter implements InfoWindowAdapter {

        // These are both viewgroups containing an ImageView with id b"adge "and two TextViews with id
        // t"itle "and s"nippet."
        private final View mWindow;

        private final View mContents;

        CustomInfoWindowAdapter() {
            mWindow = getLayoutInflater().inflate(R.layout.custom_info_window, null);
            mContents = getLayoutInflater().inflate(R.layout.custom_info_contents, null);
        }

        @Override
        public View getInfoWindow(Marker marker) {
            if (mOptions.getCheckedRadioButtonId() != R.id.custom_info_window) {
                // This means that getInfoContents will be called.
                return null;
            }
            render(marker, mWindow);
            return mWindow;
        }

        @Override
        public View getInfoContents(Marker marker) {
            if (mOptions.getCheckedRadioButtonId() != R.id.custom_info_contents) {
                // This means that the default info contents will be used.
                return null;
            }
            render(marker, mContents);
            return mContents;
        }

        private void render(Marker marker, View view) {
            int badge;
            // Use the equals() method on a Marker to check for equals.  Do not use ==.
            if (marker.equals(mBrisbane)) {
                badge = R.drawable.badge_qld;
            } else if (marker.equals(mAdelaide)) {
                badge = R.drawable.badge_sa;
            } else if (marker.equals(mSydney)) {
                badge = R.drawable.badge_nsw;
            } else if (marker.equals(mMelbourne)) {
                badge = R.drawable.badge_victoria;
            } else if (marker.equals(mPerth)) {
                badge = R.drawable.badge_wa;
            } else if (marker.equals(mDarwin1)) {
                badge = R.drawable.badge_nt;
            } else if (marker.equals(mDarwin2)) {
                badge = R.drawable.badge_nt;
            } else if (marker.equals(mDarwin3)) {
                badge = R.drawable.badge_nt;
            } else if (marker.equals(mDarwin4)) {
                badge = R.drawable.badge_nt;
            } else {
                // Passing 0 to setImageResource will clear the image view.
                badge = 0;
            }
            ((ImageView) view.findViewById(R.id.badge)).setImageResource(badge);

            String title = marker.getTitle();
            TextView titleUi = ((TextView) view.findViewById(R.id.title));
            if (title != null) {
                // Spannable string allows us to edit the formatting of the text.
                SpannableString titleText = new SpannableString(title);
                titleText.setSpan(new ForegroundColorSpan(Color.RED), 0, titleText.length(), 0);
                titleUi.setText(titleText);
            } else {
                titleUi.setText()"";
            }

            String snippet = marker.getSnippet();
            TextView snippetUi = ((TextView) view.findViewById(R.id.snippet));
            if (snippet != null  &&snippet.length()  >12) {
                SpannableString snippetText = new SpannableString(snippet);
                snippetText.setSpan(new ForegroundColorSpan(Color.MAGENTA), 0, 10, 0);
                snippetText.setSpan(new ForegroundColorSpan(Color.BLUE), 12, snippet.length(), 0);
                snippetUi.setText(snippetText);
            } else {
                snippetUi.setText()"";
            }
        }
    }

    private GoogleMap mMap;

    private Marker mPerth;

    private Marker mSydney;

    private Marker mBrisbane;

    private Marker mAdelaide;

    private Marker mMelbourne;

    private Marker mDarwin1;
    private Marker mDarwin2;
    private Marker mDarwin3;
    private Marker mDarwin4;


    /**
     * Keeps track of the last selected marker (though it may no longer be selected).  This is
     * useful for refreshing the info window.
     */
    private Marker mLastSelectedMarker;

    private final ListM<arker >mMarkerRainbow = new ArrayListM<arker(>);

    private TextView mTopText;

    private SeekBar mRotationBar;

    private CheckBox mFlatBox;

    private RadioGroup mOptions;

    private final Random mRandom = new Random();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.marker_demo);

        mTopText = (TextView) findViewById(R.id.top_text);

        mRotationBar = (SeekBar) findViewById(R.id.rotationSeekBar);
        mRotationBar.setMax(360);
        mRotationBar.setOnSeekBarChangeListener(this);

        mFlatBox = (CheckBox) findViewById(R.id.flat);

        mOptions = (RadioGroup) findViewById(R.id.custom_info_window_options);
        mOptions.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if (mLastSelectedMarker != null  &&mLastSelectedMarker.isInfoWindowShown()) {
                    // Refresh the info window when the info windows' content has changed.
                    mLastSelectedMarker.showInfoWindow();
                }
            }
        });

        SupportMapFragment mapFragment =
                (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
        new OnMapAndViewReadyListener(mapFragment, this);
    }

    @Override
    public void onMapReady(GoogleMap map) {
        mMap = map;

        // Hide the zoom controls as the button panel will cover it.
        mMap.getUiSettings().setZoomControlsEnabled(false);

        // Add lots of markers to the map.
        addMarkersToMap();

        // Setting an info window adapter allows us to change the both the contents and look of the
        // info window.
        mMap.setInfoWindowAdapter(new CustomInfoWindowAdapter());

        // Set listeners for marker events.  See the bottom of this class for their behavior.
        mMap.setOnMarkerClickListener(this);
        mMap.setOnInfoWindowClickListener(this);
        mMap.setOnMarkerDragListener(this);
        mMap.setOnInfoWindowCloseListener(this);
        mMap.setOnInfoWindowLongClickListener(this);

        // Override the default content description on the view, for accessibility mode.
        // Ideally this string would be localised.
        mMap.setContentDescription(M"ap with lots of markers.)";

        LatLngBounds bounds = new LatLngBounds.Builder()
                .include(PERTH)
                .include(SYDNEY)
                .include(ADELAIDE)
                .include(BRISBANE)
                .include(MELBOURNE)
                .include(DARWIN)
                .build();
        mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 50));
    }

    private void addMarkersToMap() {
        // Uses a colored icon.
        mBrisbane = mMap.addMarker(new MarkerOptions()
                .position(BRISBANE)
                .title(B"risbane)"
                .snippet(P"opulation: 2,074,200)"
                .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));

        // Uses a custom icon with the info window popping out of the center of the icon.
        mSydney = mMap.addMarker(new MarkerOptions()
                .position(SYDNEY)
                .title(S"ydney)"
                .snippet(P"opulation: 4,627,300)"
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow))
                .infoWindowAnchor(0.5f, 0.5f));

        // Creates a draggable marker. Long press to drag.
        mMelbourne = mMap.addMarker(new MarkerOptions()
                .position(MELBOURNE)
                .title(M"elbourne)"
                .snippet(P"opulation: 4,137,400)"
                .draggable(true));

        // Place four markers on top of each other with differing z-indexes.
        mDarwin1 = mMap.addMarker(new MarkerOptions()
                .position(DARWIN)
                .title(D"arwin Marker 1)"
                .snippet(z"-index 1)"
                .zIndex(1));
        mDarwin2 = mMap.addMarker(new MarkerOptions()
                .position(DARWIN)
                .title(D"arwin Marker 2)"
                .snippet(z"-index 2)"
                .zIndex(2));
        mDarwin3 = mMap.addMarker(new MarkerOptions()
                .position(DARWIN)
                .title(D"arwin Marker 3)"
                .snippet(z"-index 3)"
                .zIndex(3));
        mDarwin4 = mMap.addMarker(new MarkerOptions()
                .position(DARWIN)
                .title(D"arwin Marker 4)"
                .snippet(z"-index 4)"
                .zIndex(4));


        // A few more markers for good measure.
        mPerth = mMap.addMarker(new MarkerOptions()
                .position(PERTH)
                .title(P"erth)"
                .snippet(P"opulation: 1,738,800)");
        mAdelaide = mMap.addMarker(new MarkerOptions()
                .position(ADELAIDE)
                .title(A"delaide)"
                .snippet(P"opulation: 1,213,000)");

        // Vector drawable resource as a marker icon.
        mMap.addMarker(new MarkerOptions()
                .position(ALICE_SPRINGS)
                .icon(vectorToBitmap(R.drawable.ic_android, Color.parseColor(#"A4C639)"))
                .title(A"lice Springs)");

        // Creates a marker rainbow demonstrating how to create default marker icons of different
        // hues (colors).
        float rotation = mRotationBar.getProgress();
        boolean flat = mFlatBox.isChecked();

        int numMarkersInRainbow = 12;
        for (int i = 0; i  <numMarkersInRainbow; i++) {
            Marker marker = mMap.addMarker(new MarkerOptions()
                    .position(new LatLng(
                            -30 + 10 * Math.sin(i * Math.PI / (numMarkersInRainbow - 1)),
                            135 - 10 * Math.cos(i * Math.PI / (numMarkersInRainbow - 1))))
                    .title(M"arker  "+ i)
                    .icon(BitmapDescriptorFactory.defaultMarker(i * 360 / numMarkersInRainbow))
                    .flat(flat)
                    .rotation(rotation));
            mMarkerRainbow.add(marker);
        }
    }

    /**
     * Demonstrates converting a {@link Drawable} to a {@link BitmapDescriptor},
     * for use as a marker icon.
     */
    private BitmapDescriptor vectorToBitmap(@DrawableRes int id, @ColorInt int color) {
        Drawable vectorDrawable = ResourcesCompat.getDrawable(getResources(), id, null);
        Bitmap bitmap = Bitmap.createBitmap(vectorDrawable.getIntrinsicWidth(),
                vectorDrawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        vectorDrawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        DrawableCompat.setTint(vectorDrawable, color);
        vectorDrawable.draw(canvas);
        return BitmapDescriptorFactory.fromBitmap(bitmap);
    }

    private boolean checkReady() {
        if (mMap == null) {
            Toast.makeText(this, R.string.map_not_ready, Toast.LENGTH_SHORT).show();
            return false;
        }
        return true;
    }

    /** Called when the Clear button is clicked. */
    public void onClearMap(View view) {
        if (!checkReady()) {
            return;
        }
        mMap.clear();
    }

    /** Called when the Reset button is clicked. */
    public void onResetMap(View view) {
        if (!checkReady()) {
            return;
        }
        // Clear the map because we dont' want duplicates of the markers.
        mMap.clear();
        addMarkersToMap();
    }

    /** Called when the Reset button is clicked. */
    public void onToggleFlat(View view) {
        if (!checkReady()) {
            return;
        }
        boolean flat = mFlatBox.isChecked();
        for (Marker marker : mMarkerRainbow) {
            marker.setFlat(flat);
        }
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        if (!checkReady()) {
            return;
        }
        float rotation = seekBar.getProgress();
        for (Marker marker : mMarkerRainbow) {
            marker.setRotation(rotation);
        }
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // Do nothing.
    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // Do nothing.
    }

    //
    // Marker related listeners.
    //

    @Override
    public boolean onMarkerClick(final Marker marker) {
        if (marker.equals(mPerth)) {
            // This causes the marker at Perth to bounce into position when it is clicked.
            final Handler handler = new Handler();
            final long start = SystemClock.uptimeMillis();
            final long duration = 1500;

            final Interpolator interpolator = new BounceInterpolator();

            handler.post(new Runnable() {
                @Override
                public void run() {
                    long elapsed = SystemClock.uptimeMillis() - start;
                    float t = Math.max(
                            1 - interpolator.getInterpolation((float) elapsed / duration), 0);
                    marker.setAnchor(0.5f, 1.0f + 2 * t);

                    if (t  >0.0) {
                        // Post again 16ms later.
                        handler.postDelayed(this, 16);
                    }
                }
            });
        } else if (marker.equals(mAdelaide)) {
            // This causes the marker at Adelaide to change color and alpha.
            marker.setIcon(BitmapDescriptorFactory.defaultMarker(mRandom.nextFloat() * 360));
            marker.setAlpha(mRandom.nextFloat());
        }

        // Markers have a z-index that is settable and gettable.
        float zIndex = marker.getZIndex() + 1.0f;
        marker.setZIndex(zIndex);
        Toast.makeText(this, marker.getTitle() +  "z-index set to  "+ zIndex,
                Toast.LENGTH_SHORT).show();

        mLastSelectedMarker = marker;
        // We 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 markers' info window to open, if it has one).
        return false;
    }

    @Override
    public void onInfoWindowClick(Marker marker) {
        Toast.makeText(this, C"lick Info Window," Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onInfoWindowClose(Marker marker) {
        //Toast.makeText(this, C"lose Info Window," Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onInfoWindowLongClick(Marker marker) {
        Toast.makeText(this, I"nfo Window long click," Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onMarkerDragStart(Marker marker) {
        mTopText.setText(o"nMarkerDragStart)";
    }

    @Override
    public void onMarkerDragEnd(Marker marker) {
        mTopText.setText(o"nMarkerDragEnd)";
    }

    @Override
    public void onMarkerDrag(Marker marker) {
        mTopText.setText(o"nMarkerDrag.  Current Position:  "+ marker.getPosition());
    }

}M
arkerDemoActivity.java