วาดรูปหลายเหลี่ยมบนแผนที่

override fun onCreate(savedInstanceState: Bundle?) {     super.onCreate(savedInstanceState)     setContentView(R.layout.polygon_demo)      fillHueBar = findViewById<SeekBar>(R.id.fillHueSeekBar).apply {         max = MAX_HUE_DEGREES         progress = MAX_HUE_DEGREES / 2     }      fillAlphaBar = findViewById<SeekBar>(R.id.fillAlphaSeekBar).apply {         max = MAX_ALPHA         progress = MAX_ALPHA / 2     }      strokeWidthBar = findViewById<SeekBar>(R.id.strokeWidthSeekBar).apply {         max = MAX_WIDTH_PX         progress = MAX_WIDTH_PX / 3     }      strokeHueBar = findViewById<SeekBar>(R.id.strokeHueSeekBar).apply {         max = MAX_HUE_DEGREES         progress = 0     }      strokeAlphaBar = findViewById<SeekBar>(R.id.strokeAlphaSeekBar).apply {         max = MAX_ALPHA         progress = MAX_ALPHA     }      strokeJointTypeSpinner = findViewById<Spinner>(R.id.strokeJointTypeSpinner).apply {         adapter = ArrayAdapter(                 this@PolygonDemoActivity, android.R.layout.simple_spinner_item,                 getResourceStrings(jointTypeNameResourceIds))     }      strokePatternSpinner = findViewById<Spinner>(R.id.strokePatternSpinner).apply {         adapter = ArrayAdapter(                 this@PolygonDemoActivity, android.R.layout.simple_spinner_item,                 getResourceStrings(patternTypeNameResourceIds))     }      clickabilityCheckbox = findViewById(R.id.toggleClickability)      val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment     mapFragment.getMapAsync(this)     applyInsets(findViewById<View?>(R.id.map_container)) }  override fun onMapReady(googleMap: GoogleMap) {     val fillColorArgb = Color.HSVToColor(             fillAlphaBar.progress, floatArrayOf(fillHueBar.progress.toFloat(), 1f, 1f))     val strokeColorArgb = Color.HSVToColor(             strokeAlphaBar.progress, floatArrayOf(strokeHueBar.progress.toFloat(), 1f, 1f))      with(googleMap) {         // Override the default content description on the view, for accessibility mode.         setContentDescription(getString(R.string.polygon_demo_description))         // Move the googleMap so that it is centered on the mutable polygon.         moveCamera(CameraUpdateFactory.newLatLngZoom(center, 4f))          // Create a rectangle with two rectangular holes.         mutablePolygon = addPolygon(PolygonOptions().apply {             addAll(createRectangle(center, 5.0, 5.0))             addHole(createRectangle(LatLng(-22.0, 128.0), 1.0, 1.0))             addHole(createRectangle(LatLng(-18.0, 133.0), 0.5, 1.5))             fillColor(fillColorArgb)             strokeColor(strokeColorArgb)             strokeWidth(strokeWidthBar.progress.toFloat())             clickable(clickabilityCheckbox.isChecked)         })          // Add a listener for polygon clicks that changes the clicked polygon's stroke color.         setOnPolygonClickListener { polygon ->             // Flip the red, green and blue components of the polygon's stroke color.             polygon.strokeColor = polygon.strokeColor xor 0x00ffffff         }     }      // set listeners on seekBars     arrayOf(fillHueBar, fillAlphaBar, strokeWidthBar, strokeHueBar, strokeAlphaBar).map {         it.setOnSeekBarChangeListener(this)     }      // set listeners on spinners     arrayOf(strokeJointTypeSpinner, strokePatternSpinner).map {         it.onItemSelectedListener = this     }      // set line pattern and joint type based on current spinner position     with(mutablePolygon) {         strokeJointType = getSelectedJointType(strokeJointTypeSpinner.selectedItemPosition)         strokePattern = getSelectedPattern(strokePatternSpinner.selectedItemPosition)     }  }
PolygonDemoActivity.kt
        

public class PolygonDemoActivity extends SamplesBaseActivity         implements OnSeekBarChangeListener, OnItemSelectedListener, OnMapReadyCallback {      private static final LatLng CENTER = new LatLng(-20, 130);     private static final int MAX_WIDTH_PX = 100;     private static final int MAX_HUE_DEGREES = 360;     private static final int MAX_ALPHA = 255;      private static final int PATTERN_DASH_LENGTH_PX = 50;     private static final int PATTERN_GAP_LENGTH_PX = 10;     private static final Dot DOT = new Dot();     private static final Dash DASH = new Dash(PATTERN_DASH_LENGTH_PX);     private static final Gap GAP = new Gap(PATTERN_GAP_LENGTH_PX);     private static final List<PatternItem> PATTERN_DOTTED = Arrays.asList(DOT, GAP);     private static final List<PatternItem> PATTERN_DASHED = Arrays.asList(DASH, GAP);     private static final List<PatternItem> PATTERN_MIXED = Arrays.asList(DOT, GAP, DOT, DASH, GAP);      private Polygon mutablePolygon;     private SeekBar fillHueBar;     private SeekBar fillAlphaBar;     private SeekBar strokeWidthBar;     private SeekBar strokeHueBar;     private SeekBar strokeAlphaBar;     private Spinner strokeJointTypeSpinner;     private Spinner strokePatternSpinner;     private CheckBox clickabilityCheckbox;      // These are the options for polygon stroke joints and patterns. We use their     // string resource IDs as identifiers.      private static final int[] JOINT_TYPE_NAME_RESOURCE_IDS = {             com.example.common_ui.R.string.joint_type_default, // Default             com.example.common_ui.R.string.joint_type_bevel,             com.example.common_ui.R.string.joint_type_round,     };      private static final int[] PATTERN_TYPE_NAME_RESOURCE_IDS = {             com.example.common_ui.R.string.pattern_solid, // Default             com.example.common_ui.R.string.pattern_dashed,             com.example.common_ui.R.string.pattern_dotted,             com.example.common_ui.R.string.pattern_mixed,     };     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(com.example.common_ui.R.layout.polygon_demo);          fillHueBar = findViewById(com.example.common_ui.R.id.fillHueSeekBar);         fillHueBar.setMax(MAX_HUE_DEGREES);         fillHueBar.setProgress(MAX_HUE_DEGREES / 2);          fillAlphaBar = findViewById(com.example.common_ui.R.id.fillAlphaSeekBar);         fillAlphaBar.setMax(MAX_ALPHA);         fillAlphaBar.setProgress(MAX_ALPHA / 2);          strokeWidthBar = findViewById(com.example.common_ui.R.id.strokeWidthSeekBar);         strokeWidthBar.setMax(MAX_WIDTH_PX);         strokeWidthBar.setProgress(MAX_WIDTH_PX / 3);          strokeHueBar = findViewById(com.example.common_ui.R.id.strokeHueSeekBar);         strokeHueBar.setMax(MAX_HUE_DEGREES);         strokeHueBar.setProgress(0);          strokeAlphaBar = findViewById(com.example.common_ui.R.id.strokeAlphaSeekBar);         strokeAlphaBar.setMax(MAX_ALPHA);         strokeAlphaBar.setProgress(MAX_ALPHA);          strokeJointTypeSpinner = findViewById(com.example.common_ui.R.id.strokeJointTypeSpinner);         strokeJointTypeSpinner.setAdapter(new ArrayAdapter<>(                 this, android.R.layout.simple_spinner_item,                 getResourceStrings(JOINT_TYPE_NAME_RESOURCE_IDS)));          strokePatternSpinner = findViewById(com.example.common_ui.R.id.strokePatternSpinner);         strokePatternSpinner.setAdapter(new ArrayAdapter<>(                 this, android.R.layout.simple_spinner_item,                 getResourceStrings(PATTERN_TYPE_NAME_RESOURCE_IDS)));          clickabilityCheckbox = findViewById(com.example.common_ui.R.id.toggleClickability);          SupportMapFragment mapFragment =                 (SupportMapFragment) getSupportFragmentManager().findFragmentById(com.example.common_ui.R.id.map);         mapFragment.getMapAsync(this);          applyInsets(findViewById(com.example.common_ui.R.id.map_container));     }      @Override     public void onMapReady(GoogleMap map) {         // Override the default content description on the view, for accessibility mode.         map.setContentDescription(getString(com.example.common_ui.R.string.polygon_demo_description));          int fillColorArgb = Color.HSVToColor(                 fillAlphaBar.getProgress(), new float[]{fillHueBar.getProgress(), 1, 1});         int strokeColorArgb = Color.HSVToColor(                 strokeAlphaBar.getProgress(), new float[]{strokeHueBar.getProgress(), 1, 1});          // Create a rectangle with two rectangular holes.         mutablePolygon = map.addPolygon(new PolygonOptions()                 .addAll(createRectangle(CENTER, 5, 5))                 .addHole(createRectangle(new LatLng(-22, 128), 1, 1))                 .addHole(createRectangle(new LatLng(-18, 133), 0.5, 1.5))                 .fillColor(fillColorArgb)                 .strokeColor(strokeColorArgb)                 .strokeWidth(strokeWidthBar.getProgress())                 .clickable(clickabilityCheckbox.isChecked()));          fillHueBar.setOnSeekBarChangeListener(this);         fillAlphaBar.setOnSeekBarChangeListener(this);          strokeWidthBar.setOnSeekBarChangeListener(this);         strokeHueBar.setOnSeekBarChangeListener(this);         strokeAlphaBar.setOnSeekBarChangeListener(this);          strokeJointTypeSpinner.setOnItemSelectedListener(this);         strokePatternSpinner.setOnItemSelectedListener(this);          mutablePolygon.setStrokeJointType(getSelectedJointType(strokeJointTypeSpinner.getSelectedItemPosition()));         mutablePolygon.setStrokePattern(getSelectedPattern(strokePatternSpinner.getSelectedItemPosition()));          // Move the map so that it is centered on the mutable polygon.         map.moveCamera(CameraUpdateFactory.newLatLngZoom(CENTER, 4));          // Add a listener for polygon clicks that changes the clicked polygon's stroke color.         map.setOnPolygonClickListener(new GoogleMap.OnPolygonClickListener() {             @Override             public void onPolygonClick(Polygon polygon) {                 // Flip the red, green and blue components of the polygon's stroke color.                 polygon.setStrokeColor(polygon.getStrokeColor() ^ 0x00ffffff);             }         });     }  }
PolygonDemoActivity.java