رسم خطوط متعددة على خريطة

يضيف هذا المثال خطوطًا متعددة ويعدّلها على خريطة، مثل تمثيل مسار الاتجاهات على خريطة.

لمزيد من المعلومات، يُرجى الاطّلاع على المستندات.

البدء

قبل أن تتمكّن من تجربة نموذج الرمز، عليك ضبط بيئة التطوير. لمزيد من المعلومات، اطّلِع على عيّنات التعليمات البرمجية لحزمة تطوير البرامج (SDK) لتطبيق "خرائط Google" لنظام التشغيل Android.

عرض الرمز

Kotlin

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(com.example.common_ui.R.layout.polyline_demo)

    hueBar = findViewById<SeekBar>(com.example.common_ui.R.id.hueSeekBar).apply {
        max = MAX_HUE_DEGREES
        progress = 0
    }

    alphaBar = findViewById<SeekBar>(com.example.common_ui.R.id.alphaSeekBar).apply {
        max = MAX_ALPHA
        progress = MAX_ALPHA
    }

    widthBar = findViewById<SeekBar>(com.example.common_ui.R.id.widthSeekBar).apply {
        max = MAX_WIDTH_PX
        progress = MAX_WIDTH_PX / 2
    }

    startCapSpinner = findViewById<Spinner>(com.example.common_ui.R.id.startCapSpinner).apply {
        adapter = ArrayAdapter(this@PolylineDemoActivity,
                android.R.layout.simple_spinner_item,
                getResourceStrings(capTypeNameResourceIds))
    }

    endCapSpinner = findViewById<Spinner>(com.example.common_ui.R.id.endCapSpinner).apply {
        adapter = ArrayAdapter(this@PolylineDemoActivity,
                android.R.layout.simple_spinner_item,
                getResourceStrings(capTypeNameResourceIds))
    }

    jointTypeSpinner = findViewById<Spinner>(com.example.common_ui.R.id.jointTypeSpinner).apply {
        adapter = ArrayAdapter(this@PolylineDemoActivity,
                android.R.layout.simple_spinner_item,
                getResourceStrings(jointTypeNameResourceIds))
    }

    patternSpinner = findViewById<Spinner>(com.example.common_ui.R.id.patternSpinner).apply {
        adapter = ArrayAdapter(
                this@PolylineDemoActivity, android.R.layout.simple_spinner_item,
                getResourceStrings(patternTypeNameResourceIds))
    }

    clickabilityCheckbox = findViewById<CheckBox>(com.example.common_ui.R.id.toggleClickability)

    val mapFragment = supportFragmentManager.findFragmentById(com.example.common_ui.R.id.map) as SupportMapFragment
    mapFragment.getMapAsync(this)
    applyInsets(findViewById<View?>(com.example.common_ui.R.id.map_container))
}

override fun onMapReady(googleMap: GoogleMap) {
    googleMap

    with(googleMap) {
        // Override the default content description on the view, for accessibility mode.
        setContentDescription(getString(com.example.common_ui.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
    }
}
PolylineDemoActivity.kt

      

Java

public class PolylineDemoActivity extends SamplesBaseActivity
        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 = {
            com.example.common_ui.R.string.cap_butt, // Default
            com.example.common_ui.R.string.cap_round,
            com.example.common_ui.R.string.cap_square,
            com.example.common_ui.R.string.cap_image,
    };

    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.polyline_demo);

        hueBar = findViewById(com.example.common_ui.R.id.hueSeekBar);
        hueBar.setMax(MAX_HUE_DEGREES);
        hueBar.setProgress(0);

        alphaBar = findViewById(com.example.common_ui.R.id.alphaSeekBar);
        alphaBar.setMax(MAX_ALPHA);
        alphaBar.setProgress(MAX_ALPHA);

        widthBar = findViewById(com.example.common_ui.R.id.widthSeekBar);
        widthBar.setMax(MAX_WIDTH_PX);
        widthBar.setProgress(MAX_WIDTH_PX / 2);

        startCapSpinner = findViewById(com.example.common_ui.R.id.startCapSpinner);
        startCapSpinner.setAdapter(new ArrayAdapter<>(
                this, android.R.layout.simple_spinner_item,
                getResourceStrings(CAP_TYPE_NAME_RESOURCE_IDS)));

        endCapSpinner = findViewById(com.example.common_ui.R.id.endCapSpinner);
        endCapSpinner.setAdapter(new ArrayAdapter<>(
                this, android.R.layout.simple_spinner_item,
                getResourceStrings(CAP_TYPE_NAME_RESOURCE_IDS)));

        jointTypeSpinner = findViewById(com.example.common_ui.R.id.jointTypeSpinner);
        jointTypeSpinner.setAdapter(new ArrayAdapter<>(
                this, android.R.layout.simple_spinner_item,
                getResourceStrings(JOINT_TYPE_NAME_RESOURCE_IDS)));

        patternSpinner = findViewById(com.example.common_ui.R.id.patternSpinner);
        patternSpinner.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.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);
            }
        });
    }

}
PolylineDemoActivity.java

      

استنساخ العيّنات وتشغيلها

يجب استخدام Git لتشغيل هذا النموذج على الجهاز. ينسخ الأمر التالي نموذج مستودع التطبيقات.

git clone [e-mail]:googlemaps-samples/android-samples.git

استورِد نموذج المشروع إلى "استوديو Android":

1. في "استوديو Android"، اختَر ملف > جديد > استيراد مشروع.

2. انتقِل إلى الموقع الذي حفظت فيه المستودع واختَر دليل المشروع المخصّص لـ Kotlin أو Java:

   • Kotlin: PATH-REPO/android-samples/ApiDemos/kotlin
   • Java: PATH-REPO/android-samples/ApiDemos/java
3. انقر على فتح. ينشئ "استوديو Android" مشروعك باستخدام أداة Gradle لإنشاء التطبيقات.
4. أنشئ ملفًا فارغًا بتنسيق secrets.properties في الدليل نفسه الذي يتضمّن ملف local.properties الخاص بمشروعك. لمزيد من المعلومات حول هذا الملف، يُرجى الاطّلاع على مقالة إضافة مفتاح واجهة برمجة التطبيقات إلى المشروع.
5. احصل على مفتاح واجهة برمجة تطبيقات من مشروعك مع تفعيل حزمة تطوير البرامج بالاستناد إلى بيانات "خرائط Google" لتطبيقات Android.

6. أضِف السلسلة التالية إلى secrets.properties، مع استبدال YOUR_API_KEY بقيمة مفتاح واجهة برمجة التطبيقات:

   MAPS_API_KEY=YOUR_API_KEY

7. شغِّل التطبيق.