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
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
其他回答
谷歌地图V2
以下解决方案适用于Android棉花糖6 (API 23, API 24, API 25, API 26, API 27, API 28)。它也适用于Xamarin。
LatLngBounds.Builder builder = new LatLngBounds.Builder();
//the include method will calculate the min and max bound.
builder.include(marker1.getPosition());
builder.include(marker2.getPosition());
builder.include(marker3.getPosition());
builder.include(marker4.getPosition());
LatLngBounds bounds = builder.build();
int width = getResources().getDisplayMetrics().widthPixels;
int height = getResources().getDisplayMetrics().heightPixels;
int padding = (int) (width * 0.10); // offset from edges of the map 10% of screen
CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, width, height, padding);
mMap.animateCamera(cu);
用谷歌地图显示所有标记
在这些方法中存储所有标记,并自动缩放显示谷歌地图中的所有标记。
// Declare the Markers List.
List<MarkerOptions> markerList;
private BitmapDescriptor vnrPoint,banPoint;
public void storeAllMarkers()
{
markerList=new ArrayList<>();
markerList.removeAll(markerList);
// latitude and longitude of Virudhunagar
double latitude1=9.587209;
double longitude1=77.951431;
vnrPoint=BitmapDescriptorFactory.fromResource(R.drawable.location_icon_1);
LatLng vnr = new LatLng(latitude1, longitude1);
MarkerOptions vnrMarker = new MarkerOptions();
vnrMarker.position(vnr);
vnrMarker.icon(vnrPoint);
markerList.add(vnrMarker);
// latitude and longitude of Bengaluru
double latitude2=12.972442;
double longitude2=77.580643;
banPoint=BitmapDescriptorFactory.fromResource(R.drawable.location_icon_2);
LatLng ban = new LatLng(latitude2, longitude2);
MarkerOptions bengalureMarker = new MarkerOptions();
bengalureMarker.position(ban);
bengalureMarker.icon(banPoint);
markerList.add(bengalureMarker);
// You can add any numbers of MarkerOptions like this.
showAllMarkers();
}
public void showAllMarkers()
{
LatLngBounds.Builder builder = new LatLngBounds.Builder();
for (MarkerOptions m : markerList) {
builder.include(m.getPosition());
}
LatLngBounds bounds = builder.build();
int width = getResources().getDisplayMetrics().widthPixels;
int height = getResources().getDisplayMetrics().heightPixels;
int padding = (int) (width * 0.30);
// Zoom and animate the google map to show all markers
CameraUpdate cu = CameraUpdateFactory.newLatLngBounds(bounds, width, height, padding);
googleMap.animateCamera(cu);
}
我有类似的问题,使用以下代码解决了这个问题:
CameraUpdateFactory。newLatLngBounds(bounds, 200,200,5)通常在我的情况下,位置差异不超过两个相邻城市。
缩放以适应地图谷歌地图v2上的所有标记
我不能使用onGlobalLayoutlistener,所以这里有另一个解决方案来防止 “地图大小不能为0。最有可能的是,地图视图的布局还没有发生。要么等待布局发生,要么使用newLatLngBounds(LatLngBounds, int, int, int),它允许你指定地图的尺寸。
mMap.setOnMapLoadedCallback(new GoogleMap.OnMapLoadedCallback() {
@Override
public void onMapLoaded() {
mMap.moveCamera(CameraUpdateFactory.newLatLngBounds(builder.build(), 15));
}
});
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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