我在谷歌地图上有10个标记。我想要尽可能放大,并保持所有标记都在视野中?在早期版本中,这可以从zoomToSpan()实现,但在v2中,我不知道如何做到这一点。此外,我知道需要可见的圆的半径。
当前回答
使用“getCenterCoordinate”方法获取中心坐标,并在camerposition中使用。
private void setUpMap() {
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setScrollGesturesEnabled(true);
mMap.getUiSettings().setTiltGesturesEnabled(true);
mMap.getUiSettings().setRotateGesturesEnabled(true);
clientMarker = mMap.addMarker(new MarkerOptions()
.position(new LatLng(Double.valueOf(-12.1024174), Double.valueOf(-77.0262274)))
.icon(BitmapDescriptorFactory.fromResource(R.mipmap.ic_taxi))
);
clientMarker = mMap.addMarker(new MarkerOptions()
.position(new LatLng(Double.valueOf(-12.1024637), Double.valueOf(-77.0242617)))
.icon(BitmapDescriptorFactory.fromResource(R.mipmap.ic_location))
);
camPos = new CameraPosition.Builder()
.target(getCenterCoordinate())
.zoom(17)
.build();
camUpd3 = CameraUpdateFactory.newCameraPosition(camPos);
mMap.animateCamera(camUpd3);
}
public LatLng getCenterCoordinate(){
LatLngBounds.Builder builder = new LatLngBounds.Builder();
builder.include(new LatLng(Double.valueOf(-12.1024174), Double.valueOf(-77.0262274)));
builder.include(new LatLng(Double.valueOf(-12.1024637), Double.valueOf(-77.0242617)));
LatLngBounds bounds = builder.build();
return bounds.getCenter();
}
其他回答
我用一个片段在Kotlin中显示多个标记,解决了同样的问题
首先声明一个标记列表
private lateinit var markers: MutableList<Marker>
在分支的oncreate方法中初始化它
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
//initialize markers list
markers = mutableListOf()
return inflater.inflate(R.layout.fragment_driver_map, container, false)
}
在OnMapReadyCallback中将标记添加到标记列表中
private val callback = OnMapReadyCallback { googleMap ->
map = googleMap
markers.add(
map.addMarker(
MarkerOptions().position(riderLatLng)
.title("Driver")
.snippet("Driver")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED))))
markers.add(
map.addMarker(
MarkerOptions().position(driverLatLng)
.title("Driver")
.snippet("Driver")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN))))
仍然是回调
//create builder
val builder = LatLngBounds.builder()
//loop through the markers list
for (marker in markers) {
builder.include(marker.position)
}
//create a bound
val bounds = builder.build()
//set a 200 pixels padding from the edge of the screen
val cu = CameraUpdateFactory.newLatLngBounds(bounds,200)
//move and animate the camera
map.moveCamera(cu)
//animate camera by providing zoom and duration args, callBack set to null
map.animateCamera(CameraUpdateFactory.zoomTo(10f), 2000, null)
快乐的程序员们
注意-这不是原始问题的解决方案。这是上面讨论的子问题之一的解决方案。
解决方案@andr澄清2 -
当边界中只有一个标记时,缩放级别被设置为非常高的级别(级别21),这真的很有问题。谷歌不提供任何设置最大缩放级别的方法。当有多个标记但它们彼此非常接近时,也会发生这种情况。同样的问题也会出现。
解决方案-假设你想让你的地图永远不超过16缩放级别。然后在做了
CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, padding);
mMap.moveCamera(cu);
检查你的缩放级别是否超过了16级(或任何你想要的)
float currentZoom = mMap.getCameraPosition().zoom;
如果这个级别大于16,只有当标记非常少或所有标记彼此非常接近时才会出现这种情况,那么只需将缩放级别设置为16,就可以在特定位置缩小地图。
mMap.moveCamera(CameraUpdateFactory.zoomTo(16));
这样你就永远不会有“奇怪的”缩放级别的问题,@andr解释得很好。
我有另一种方法来做同样的事情,效果很好。为了在屏幕上显示所有标记,我们需要一个中长和缩放级别。这里是一个函数,它会给你两个,需要所有标记的Latlng对象作为输入。
public Pair<LatLng, Integer> getCenterWithZoomLevel(LatLng... l) {
float max = 0;
if (l == null || l.length == 0) {
return null;
}
LatLngBounds.Builder b = new LatLngBounds.Builder();
for (int count = 0; count < l.length; count++) {
if (l[count] == null) {
continue;
}
b.include(l[count]);
}
LatLng center = b.build().getCenter();
float distance = 0;
for (int count = 0; count < l.length; count++) {
if (l[count] == null) {
continue;
}
distance = distance(center, l[count]);
if (distance > max) {
max = distance;
}
}
double scale = max / 1000;
int zoom = ((int) (16 - Math.log(scale) / Math.log(2)));
return new Pair<LatLng, Integer>(center, zoom);
}
这个函数返回Pair对象,你可以像这样使用它
getCenterWithZoomLevel(l1,l2,l3..); mGoogleMap.moveCamera (CameraUpdateFactory.newLatLngZoom(一对。首先,pair.second));
你可以不用填充来让标记远离屏幕边界,你可以通过-1来调整缩放。
//For adding a marker in Google map
MarkerOptions mp = new MarkerOptions();
mp.position(new LatLng(Double.parseDouble(latitude), Double.parseDouble(longitude)));
mp.snippet(strAddress);
map.addMarker(mp);
try {
b = new LatLngBounds.Builder();
if (MapDetailsList.list != null && MapDetailsList.list.size() > 0) {
for (int i = 0; i < MapDetailsList.list.size(); i++) {
b.include(new LatLng(Double.parseDouble(MapDetailsList.list.get(i).getLatitude()),
Double.parseDouble(MapDetailsList.list.get(i).getLongitude())));
}
LatLngBounds bounds = b.build();
DisplayMetrics displayMetrics = getResources().getDisplayMetrics();
int width = displayMetrics.widthPixels;
int height = displayMetrics.heightPixels;
// Change the padding as per needed
CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, width-200, height-200, 5);
// map.setCenter(bounds.getCenter());
map.animateCamera(cu);
}
} catch (Exception e) {
}
http://i64.tinypic.com/2qjybh4.png
http://i63.tinypic.com/flzwus.png
http://i63.tinypic.com/112g5fm.png
这会有帮助的。从谷歌api演示
private List<Marker> markerList = new ArrayList<>();
Marker marker = mGoogleMap.addMarker(new MarkerOptions().position(geoLatLng)
.title(title));
markerList.add(marker);
// Pan to see all markers in view.
// Cannot zoom to bounds until the map has a size.
final View mapView = getSupportFragmentManager().findFragmentById(R.id.map).getView();
if (mapView!=null) {
if (mapView.getViewTreeObserver().isAlive()) {
mapView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@SuppressWarnings("deprecation") // We use the new method when supported
@SuppressLint("NewApi") // We check which build version we are using.
@Override
public void onGlobalLayout() {
//Calculate the markers to get their position
LatLngBounds.Builder b = new LatLngBounds.Builder();
for (Marker m : markerList) {
b.include(m.getPosition());
}
// also include current location to include in the view
b.include(new LatLng(mLocation.getLatitude(),mLocation.getLongitude()));
LatLngBounds bounds = b.build();
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
mapView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
} else {
mapView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
mGoogleMap.moveCamera(CameraUpdateFactory.newLatLngBounds(bounds, 50));
}
});
}
}
清楚的信息看这个url。 https://github.com/googlemaps/android-samples/blob/master/ApiDemos/app/src/main/java/com/example/mapdemo/MarkerDemoActivity.java
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