Question

我无法缩放起点（绿色标记）和终点（红色标记），我的代码放大了终点。见下图

使用以下方法获取我的第一个和最后一个数据：

   public void createMarker(int index, Double latitude, Double longitude, String location, String remarks) {

    double latitudeStart, longitudeStart;
    double latitudeEnd, longitudeEnd;

    index = index + 1;
    String text = String.valueOf(index);

    BitmapDescriptor image = BitmapDescriptorFactory.fromResource(index);

    IconGenerator tc = new IconGenerator(getContext());


    if (index == 1) {
        image = BitmapDescriptorFactory.fromResource(R.drawable.pin_green);
        latitudeStart =latitude;
        longitudeStart = longitude;
        mMapSnailTrail.addMarker(new MarkerOptions()
                .position(new LatLng(latitude, longitude))
                .anchor(0.5f, 0.5f)
                .title(location)
                .snippet(remarks)
                .icon(image));

    } else if (index == response_last.body().getAsJsonArray().size()) {
        image = BitmapDescriptorFactory.fromResource(R.drawable.pin_red);
        latitudeEnd =latitude;
        longitudeEnd = longitude;
        mMapSnailTrail.addMarker(new MarkerOptions()
                .position(new LatLng(latitude, longitude))
                .anchor(0.5f, 0.5f)
                .title(location)
                .snippet(remarks)
                .icon(image));
    } else {

    }

    LatLngBounds.Builder builder = new LatLngBounds.Builder();
    builder.include(new LatLng(latitudeStart,longitudeStart));
    builder.include(new LatLng(latitudeEnd,longitudeEnd));
    LatLngBounds bounds = builder.build();
    mMapSnailTrail.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, 10));

    mMapSnailTrail.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
        @Override
        public void onInfoWindowClick(Marker marker) {
            marker.hideInfoWindow();
        }
    });
}

数据纬度和经度来自API，我通过此代码获取它们：

String lati = jo.get("lat").toString();
                    String latiString = lati;
                    latiString = latiString.replace("\"", "");
                    String lat = String.valueOf(latiString);


                    String longi = jo.get("lng").toString();
                    String longiString = longi;
                    longiString = longiString.replace("\"", "");
                    String lng = String.valueOf(longiString);

最后这是我一直在使用的创建标记：

 LatLngBounds.Builder builder = new LatLngBounds.Builder();
    //starting point
    builder.include(new LatLng(latitude,longitude));
        //end point
    builder.include(new LatLng(latitude,longitude));

    LatLngBounds bounds = builder.build();
    mMapSnailTrail.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, 50));

我真的需要你的帮助来完成这项任务。我在互联网上搜索，但我找不到解决方案。谢谢你们！

Answer 1

尝试添加此行代码

map.getUiSettings().setZoomControlsEnabled(true);

Answer 2

似乎，您使用相同的LatLng坐标LatLng(latitude,longitude)进行缩放：

//starting point
builder.include(new LatLng(latitude,longitude));
//end point
builder.include(new LatLng(latitude,longitude));

可能是

 //starting point
 builder.include(new LatLng(latitudeStart,longitudeStart));
 //end point
 builder.include(new LatLng(latitudeEnd,longitudeEnd));

其中(latitudeStart,longitudeStart) - 起点坐标（绿色标记）和(latitudeEnd,longitudeEnd) - 终点坐标（红色标记），解决问题。您可以通过这种方式获取latitudeStart，longitudeStart，latitudeEnd和longitudeEnd（已更新）：

// wrong code:
// LatLng latitudeStart, longitudeStart;
// LatLng latitudeEnd, longitudeEnd;

// update2: global variables
double latitudeMin = 1000, longitudeMin = 1000;   // better get first value of lat/lon, not 1000
double latitudeMax = -1000, longitudeMax = -1000;  // better get first value of lat/lon, not -1000

...

// test current latitude is min or max
if (latitude < latitudeMin) {
    latitudeMin = latitude;
} else {
    if (latitude > latitudeMax) {
        latitudeMax = latitude;
    }
} 

// test current longitude is min or max
if (longitude< longitudeMin) {
    longitudeMin = longitude;
} else {
    if (longitude> longitudeMax) {
        longitudeMax = longitude;
    }
} 


if (index == 1) {

    image = BitmapDescriptorFactory.fromResource(R.drawable.pin_green);
    mMapSnailTrail.addMarker(new MarkerOptions()
            .position(new LatLng(latitude, longitude))
            .anchor(0.5f, 0.5f)
            .title(location)
            .snippet(remarks)
            .icon(image));

} else if (index == response_last.body().getAsJsonArray().size()) {
    image = BitmapDescriptorFactory.fromResource(R.drawable.pin_red);
    mMapSnailTrail.addMarker(new MarkerOptions()
            .position(new LatLng(latitude, longitude))
            .anchor(0.5f, 0.5f)
            .title(location)
            .snippet(remarks)
            .icon(image));
} else {

}

...

然后，在createMarker()之外：

LatLngBounds.Builder builder = new LatLngBounds.Builder();
builder.include(new LatLng(latitudeMin,longitudeMin));
builder.include(new LatLng(latitudeMax,longitudeMax));
LatLngBounds bounds = builder.build();
mMapSnailTrail.animateCamera(CameraUpdateFactory.newLatLngBounds(bounds, 10));

Android在地图片段上显示多个标记

2 个答案: