[英]How to bind google map markers in a circle?
我需要在Google地圖圈子中綁定多個標記。 我正在從onMapReady
調用以下方法來加載標記:
void addMarker()
{
mMap.clear();
for (int i = 0; i < response.getData().getCount(); i++) {
float lat = response.getData().get(i).getLat();
float lng = response.getData().get(i).getLng();
........
........
LatLng location = new LatLng(lat, lng);
Marker mapMarker = mMap.addMarker(new MarkerOptions()
.position(location)
.draggable(false)
.icon(bitmapMarker));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(location, 17));
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
addMarkers();
DraggableCircle circle = new DraggableCircle(LOCATION, DEFAULT_RADIUS);
}
按照上述代碼,我能夠在給定位置繪制一個circle
並在給定coordinates
上添加標記。 一切工作正常,例如如果我增加圓圈的大小,則地圖將根據屏幕尺寸調整縮放大小。
現在我要尋找的是:
radius
就會出現新的標記。 任何提示或幫助將是可觀的。
希望我不要誤會你。
底部有一個搜索欄,每當您更改它時,它也會同時改變圓半徑。
然后我在filterMarkers方法中通過新的半徑值過濾標記
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private SeekBar mRadiusSeekBar;
private Circle mCircle;
private double mCircleRadius = 250;
private LatLng mCircleCenter = new LatLng(38.432398, 27.155882);
private void addCircle(){
mCircle = mMap.addCircle(new CircleOptions()
.strokeWidth(4)
.radius(mCircleRadius)
.center(mCircleCenter)
.strokeColor(Color.parseColor("#D1C4E9"))
.fillColor(Color.parseColor("#657C4DFF")));
}
private List<LatLng> mPoints = new ArrayList<>();
private List<Marker> mMarkers = new ArrayList<>();
private void addMarkers(){
LatLng mPoint1 = new LatLng(38.440925, 27.153672);
LatLng mPoint2 = new LatLng(38.440700, 27.155877);
LatLng mPoint3 = new LatLng(38.438402, 27.153988);
LatLng mPoint4 = new LatLng(38.433767, 27.155410);
LatLng mPoint5 = new LatLng(38.432143, 27.156049);
LatLng mPoint6 = new LatLng(38.427804, 27.153486);
LatLng mPoint7 = new LatLng(38.424637, 27.152007);
LatLng mPoint8 = new LatLng(38.421315, 27.153216);
LatLng mPoint9 = new LatLng(38.418219, 27.154731);
LatLng mPoint10 = new LatLng(38.414628, 27.156085);
mPoints.add(mPoint1);
mPoints.add(mPoint2);
mPoints.add(mPoint3);
mPoints.add(mPoint4);
mPoints.add(mPoint5);
mPoints.add(mPoint6);
mPoints.add(mPoint7);
mPoints.add(mPoint8);
mPoints.add(mPoint9);
mPoints.add(mPoint10);
BitmapDescriptor bd = BitmapDescriptorFactory
.defaultMarker(BitmapDescriptorFactory.HUE_VIOLET);
for(int i = 0; i<mPoints.size(); i++){
Marker marker = mMap.addMarker(
new MarkerOptions()
.visible(false)
.position(mPoints.get(i)).icon(bd));
mMarkers.add(marker);
}
}
private void filterMarkers(double radiusForCircle){
mCircle.setRadius(radiusForCircle);
float[] distance = new float[2];
for(int m = 0; m < mMarkers.size(); m++){
Marker marker = mMarkers.get(m);
LatLng position = marker.getPosition();
double lat = position.latitude;
double lon = position.longitude;
Location.distanceBetween(lat, lon, mCircleCenter.latitude,
mCircleCenter.longitude, distance);
boolean inCircle = distance[0] <= radiusForCircle;
marker.setVisible(inCircle);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
mRadiusSeekBar = (SeekBar) findViewById(R.id.seekbar);
mRadiusSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
filterMarkers(progress * 10);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
mMap.moveCamera(CameraUpdateFactory
.newLatLngZoom(mCircleCenter, 12));
addMarkers();
addCircle();
}
}
布局
<FrameLayout android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.blackkara.mapquestions.MapsActivity" />
<android.support.v7.widget.AppCompatSeekBar
android:id="@+id/seekbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"/>
</FrameLayout>
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