בדוגמה הזו מופיעה הגדרה והוספה של קווים פוליגוניים למפה, למשל ייצוג של מסלול מסלול במפה.
מידע נוסף זמין במסמכי התיעוד.
תחילת העבודה
כדי שתוכלו לנסות את הקוד לדוגמה, עליכם להגדיר את סביבת הפיתוח. מידע נוסף זמין במאמר SDK של מפות Google לדוגמאות קוד של Android.
הצגת הקוד
Kotlin
override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.polyline_demo) hueBar = findViewById<SeekBar>(R.id.hueSeekBar).apply { max = MAX_HUE_DEGREES progress = 0 } alphaBar = findViewById<SeekBar>(R.id.alphaSeekBar).apply { max = MAX_ALPHA progress = MAX_ALPHA } widthBar = findViewById<SeekBar>(R.id.widthSeekBar).apply { max = MAX_WIDTH_PX progress = MAX_WIDTH_PX / 2 } startCapSpinner = findViewById<Spinner>(R.id.startCapSpinner).apply { adapter = ArrayAdapter(this@PolylineDemoActivity, android.R.layout.simple_spinner_item, getResourceStrings(capTypeNameResourceIds)) } endCapSpinner = findViewById<Spinner>(R.id.endCapSpinner).apply { adapter = ArrayAdapter(this@PolylineDemoActivity, android.R.layout.simple_spinner_item, getResourceStrings(capTypeNameResourceIds)) } jointTypeSpinner = findViewById<Spinner>(R.id.jointTypeSpinner).apply { adapter = ArrayAdapter(this@PolylineDemoActivity, android.R.layout.simple_spinner_item, getResourceStrings(jointTypeNameResourceIds)) } patternSpinner = findViewById<Spinner>(R.id.patternSpinner).apply { adapter = ArrayAdapter( this@PolylineDemoActivity, android.R.layout.simple_spinner_item, getResourceStrings(patternTypeNameResourceIds)) } clickabilityCheckbox = findViewById<CheckBox>(R.id.toggleClickability) val mapFragment = supportFragmentManager.findFragmentById(R.id.map) as SupportMapFragment mapFragment.getMapAsync(this) } override fun onMapReady(googleMap: GoogleMap) { googleMap with(googleMap) { // Override the default content description on the view, for accessibility mode. setContentDescription(getString(R.string.polyline_demo_description)) // A geodesic polyline that goes around the world. addPolyline(PolylineOptions().apply { add(lhrLatLng, aklLatLng, laxLatLng, jfkLatLng, lhrLatLng) width(INITIAL_STROKE_WIDTH_PX.toFloat()) color(Color.BLUE) geodesic(true) clickable(clickabilityCheckbox.isChecked) }) // Move the googleMap so that it is centered on the mutable polyline. moveCamera(CameraUpdateFactory.newLatLngZoom(melbourneLatLng, 3f)) // Add a listener for polyline clicks that changes the clicked polyline's color. setOnPolylineClickListener { polyline -> // Flip the values of the red, green and blue components of the polyline's color. polyline.color = polyline.color xor 0x00ffffff } } // A simple polyline across Australia. This polyline will be mutable. mutablePolyline = googleMap.addPolyline(PolylineOptions().apply{ color(Color.HSVToColor( alphaBar.progress, floatArrayOf(hueBar.progress.toFloat(), 1f, 1f))) width(widthBar.progress.toFloat()) clickable(clickabilityCheckbox.isChecked) add(melbourneLatLng, adelaideLatLng, perthLatLng, darwinLatLng) }) arrayOf(hueBar, alphaBar, widthBar).map { it.setOnSeekBarChangeListener(this) } arrayOf(startCapSpinner, endCapSpinner, jointTypeSpinner, patternSpinner).map { it.onItemSelectedListener = this } with(mutablePolyline) { startCap = getSelectedCap(startCapSpinner.selectedItemPosition) ?: ButtCap() endCap = getSelectedCap(endCapSpinner.selectedItemPosition) ?: ButtCap() jointType = getSelectedJointType(jointTypeSpinner.selectedItemPosition) pattern = getSelectedPattern(patternSpinner.selectedItemPosition) } clickabilityCheckbox.setOnClickListener { view -> mutablePolyline.isClickable = (view as CheckBox).isChecked } }
Java
public class PolylineDemoActivity extends AppCompatActivity implements OnSeekBarChangeListener, OnItemSelectedListener, OnMapReadyCallback { // City locations for mutable polyline. private static final LatLng ADELAIDE = new LatLng(-34.92873, 138.59995); private static final LatLng DARWIN = new LatLng(-12.4258647, 130.7932231); private static final LatLng MELBOURNE = new LatLng(-37.81319, 144.96298); private static final LatLng PERTH = new LatLng(-31.95285, 115.85734); // Airport locations for geodesic polyline. private static final LatLng AKL = new LatLng(-37.006254, 174.783018); private static final LatLng JFK = new LatLng(40.641051, -73.777485); private static final LatLng LAX = new LatLng(33.936524, -118.377686); private static final LatLng LHR = new LatLng(51.471547, -0.460052); 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 CUSTOM_CAP_IMAGE_REF_WIDTH_PX = 50; private static final int INITIAL_STROKE_WIDTH_PX = 5; private static final int PATTERN_DASH_LENGTH_PX = 50; private static final int PATTERN_GAP_LENGTH_PX = 20; 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 Polyline mutablePolyline; private SeekBar hueBar; private SeekBar alphaBar; private SeekBar widthBar; private Spinner startCapSpinner; private Spinner endCapSpinner; private Spinner jointTypeSpinner; private Spinner patternSpinner; private CheckBox clickabilityCheckbox; // These are the options for polyline caps, joints and patterns. We use their // string resource IDs as identifiers. private static final int[] CAP_TYPE_NAME_RESOURCE_IDS = { R.string.cap_butt, // Default R.string.cap_round, R.string.cap_square, R.string.cap_image, }; private static final int[] JOINT_TYPE_NAME_RESOURCE_IDS = { R.string.joint_type_default, // Default R.string.joint_type_bevel, R.string.joint_type_round, }; private static final int[] PATTERN_TYPE_NAME_RESOURCE_IDS = { R.string.pattern_solid, // Default R.string.pattern_dashed, R.string.pattern_dotted, R.string.pattern_mixed, }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.polyline_demo); hueBar = findViewById(R.id.hueSeekBar); hueBar.setMax(MAX_HUE_DEGREES); hueBar.setProgress(0); alphaBar = findViewById(R.id.alphaSeekBar); alphaBar.setMax(MAX_ALPHA); alphaBar.setProgress(MAX_ALPHA); widthBar = findViewById(R.id.widthSeekBar); widthBar.setMax(MAX_WIDTH_PX); widthBar.setProgress(MAX_WIDTH_PX / 2); startCapSpinner = findViewById(R.id.startCapSpinner); startCapSpinner.setAdapter(new ArrayAdapter<>( this, android.R.layout.simple_spinner_item, getResourceStrings(CAP_TYPE_NAME_RESOURCE_IDS))); endCapSpinner = findViewById(R.id.endCapSpinner); endCapSpinner.setAdapter(new ArrayAdapter<>( this, android.R.layout.simple_spinner_item, getResourceStrings(CAP_TYPE_NAME_RESOURCE_IDS))); jointTypeSpinner = findViewById(R.id.jointTypeSpinner); jointTypeSpinner.setAdapter(new ArrayAdapter<>( this, android.R.layout.simple_spinner_item, getResourceStrings(JOINT_TYPE_NAME_RESOURCE_IDS))); patternSpinner = findViewById(R.id.patternSpinner); patternSpinner.setAdapter(new ArrayAdapter<>( this, android.R.layout.simple_spinner_item, getResourceStrings(PATTERN_TYPE_NAME_RESOURCE_IDS))); clickabilityCheckbox = findViewById(R.id.toggleClickability); SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map); mapFragment.getMapAsync(this); } @Override public void onMapReady(GoogleMap map) { // Override the default content description on the view, for accessibility mode. map.setContentDescription(getString(R.string.polyline_demo_description)); // A geodesic polyline that goes around the world. map.addPolyline(new PolylineOptions() .add(LHR, AKL, LAX, JFK, LHR) .width(INITIAL_STROKE_WIDTH_PX) .color(Color.BLUE) .geodesic(true) .clickable(clickabilityCheckbox.isChecked())); // A simple polyline across Australia. This polyline will be mutable. int color = Color.HSVToColor( alphaBar.getProgress(), new float[]{hueBar.getProgress(), 1, 1}); mutablePolyline = map.addPolyline(new PolylineOptions() .color(color) .width(widthBar.getProgress()) .clickable(clickabilityCheckbox.isChecked()) .add(MELBOURNE, ADELAIDE, PERTH, DARWIN)); hueBar.setOnSeekBarChangeListener(this); alphaBar.setOnSeekBarChangeListener(this); widthBar.setOnSeekBarChangeListener(this); startCapSpinner.setOnItemSelectedListener(this); endCapSpinner.setOnItemSelectedListener(this); jointTypeSpinner.setOnItemSelectedListener(this); patternSpinner.setOnItemSelectedListener(this); mutablePolyline.setStartCap(getSelectedCap(startCapSpinner.getSelectedItemPosition())); mutablePolyline.setEndCap(getSelectedCap(endCapSpinner.getSelectedItemPosition())); mutablePolyline.setJointType(getSelectedJointType(jointTypeSpinner.getSelectedItemPosition())); mutablePolyline.setPattern(getSelectedPattern(patternSpinner.getSelectedItemPosition())); // Move the map so that it is centered on the mutable polyline. map.moveCamera(CameraUpdateFactory.newLatLngZoom(MELBOURNE, 3)); // Add a listener for polyline clicks that changes the clicked polyline's color. map.setOnPolylineClickListener(new GoogleMap.OnPolylineClickListener() { @Override public void onPolylineClick(Polyline polyline) { // Flip the values of the red, green and blue components of the polyline's color. polyline.setColor(polyline.getColor() ^ 0x00ffffff); } }); } }
שכפול והרצת הדוגמאות
יש צורך ב-Git כדי להריץ את הדוגמה הזו באופן מקומי. הפקודה הבאה משכפלת את מאגר האפליקציות לדוגמה.
git clone git@github.com:googlemaps-samples/android-samples.git
ייבוא של הפרויקט לדוגמה אל Android Studio:
- ב-Android Studio, בוחרים באפשרות קובץ > חדש > ייבוא פרויקט.
נכנסים למיקום שבו שמרתם את המאגר ובוחרים את ספריית הפרויקט עבור Kotlin או Java:
- Kotlin:
PATH-REPO/android-samples/ApiDemos/kotlin
- Java:
PATH-REPO/android-samples/ApiDemos/java
- Kotlin:
- לוחצים על פתיחה. המערכת של Android Studio יוצרת את הפרויקט שלך באמצעות הכלי לבניית אתרים של Gradle.
- יוצרים קובץ
secrets.properties
ריק באותה ספרייה שבה נמצא קובץlocal.properties
של הפרויקט. מידע נוסף זמין במאמר הוספת מפתח ה-API לפרויקט. מוסיפים את המחרוזת הבאה אל
secrets.properties
ומחליפים את YOUR_API_KEY בערך של מפתח ה-API:MAPS_API_KEY=YOUR_API_KEY
- מפעילים את האפליקציה.