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

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);
}

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();
}

   //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) {

        }

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