如何顺利地在Google Maps v2 android中保持移动当前位置标记 [英] How to smoothly keep moving current location marker in Google Maps v2 android
问题描述
我为我的位置放了一个标记。我想平稳地移动我的标记,就像Google地图应用程序一样。当我继续在我的车中移动时,蓝色圆圈运动非常顺畅。我想为我的应用实现相同的功能。我如何在我的应用程序上实现这个功能?
到目前为止,我的位置标记只是跳转到非常位置变化的不同位置,并在那里标记标记。
以下是我所不知道的:
googleMap.setMyLocationEnabled(真正);
所以onMyLocationChange方法会自动调用:
@Override
public void onMyLocationChange(Location location)
{
curlat = location.getLatitude();
curlong = location.getLongitude();
if(markermylocation!= null)
{
markermylocation.remove();
}
curlat = location.getLatitude();
curlong = location.getLongitude();
myLocation(curlat,curlong,username,imageURL,ZOOMVALUE);
}
在mylocaiton方法中:
private void myLocation(double lat,double lng,String name,String url,float zoom)
{
if(firsttime == 1)
{
LatLng ll = new LatLng(lat,lng);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll,zoom);
googleMap.animateCamera(更新);
firsttime = 0;
}
final String uname = name;
curlat = lat;
curlong = lng;
LatLng position = new LatLng(curlat,curlong);
markerOptionsmylocaiton = new MarkerOptions()。position(position).icon(BitmapDescriptorFactory.fromBitmap(icon))。title(uname).anchor(0.5f,1f);
markermylocation = googleMap.addMarker(markerOptionsmylocaiton);
LatLng latlang = new LatLng(curlat,curlong);
animateMarker(markermylocation,latlang,false);
$ b因此,每次调用mylocation时,标记将被移除并调用mylocation方法,然后创建新邮票中的标记。相反,我希望像谷歌地图这样的标记平稳过渡?如何实现这一点?
更新:
在这几次工作之后:我来到这个代码最后但是我的标记没有显示出来:
我使用下面的方法并每次在myLocation方法中调用它。
public void animateMarker(final Marker marker,final LatLng toPosition,
final boolean hideMarker)
{
final Handler handler = new Handler( );
final long start = SystemClock.uptimeMillis();
Projection proj = googleMap.getProjection();
Point startPoint = proj.toScreenLocation(marker.getPosition());
final LatLng startLatLng = proj.fromScreenLocation(startPoint);
最终持续时间= 500;
final插值器插值器=新的LinearInterpolator();
handler.post(new Runnable()
{
@Override
public void run()
{
经过的时间= SystemClock。 uptimeMillis() - 开始;
float t = interpolator.getInterpolation((float)逝去的
/持续时间);
double lng = t * toPosition.longitude +(1 - t)
* startLatLng.longitude;
double lat = t * toPosition.latitude +(1 - t)
* startLatLng.latitude;
marker.setPosition(new LatLng(lat,lng));
if(t <1.0)
{
// 16ms后再次发布
handler.postDelayed(this,16);
}
else
{
if(hideMarker)
{
marker.setVisible(false);
}
else
{
marker.setVisible(true);
}
}
}
});
谢谢!
解决方案您必须在位置的新位置和标记的当前位置之间使用插值器,它可以是线性的,也可以是加速度插值器。这里有一个反射插值器的例子。
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
最终持续时间= 2500;
最终插值器interpolator = new BounceInterpolator();
marker.setVisible(true);
handler.post(new Runnable(){
@Override
public void run(){
long elapsed = SystemClock.uptimeMillis() - start;
float t = Math.max(
1 - interpolator.getInterpolation((float)elapsed
/ duration),0);
marker.setAnchor(0.5f,1.0
marker.setPosition(latlng)
if(t> 0.0){
// 16ms后再次发布
处理函数。 postDelayed(this,16);
}
}
});
I have placed a marker for my location. I would like to move my marker smoothly something like the Google maps app. The blue circle moves very smoothly when I keep moving in my car. I would like implement the same for my app. how do I implement this on my app?
As of now my location marker just jumps for different location on very location change and marks the marker there.
Here is what I have don:
googleMap.setMyLocationEnabled(true);
So onMyLocationChange method is called automatically:
@Override
public void onMyLocationChange(Location location)
{
curlat = location.getLatitude();
curlong = location.getLongitude();
if (markermylocation != null)
{
markermylocation.remove();
}
curlat = location.getLatitude();
curlong = location.getLongitude();
myLocation(curlat, curlong, username, imageURL, ZOOMVALUE);
}
in mylocaiton method:
private void myLocation(double lat, double lng, String name, String url, float zoom)
{
if(firsttime == 1)
{
LatLng ll = new LatLng(lat,lng);
CameraUpdate update = CameraUpdateFactory.newLatLngZoom(ll, zoom);
googleMap.animateCamera(update);
firsttime = 0;
}
final String uname = name;
curlat = lat;
curlong = lng;
LatLng position = new LatLng(curlat, curlong);
markerOptionsmylocaiton = new MarkerOptions().position(position).icon(BitmapDescriptorFactory.fromBitmap(icon)).title(uname).anchor(0.5f, 1f);
markermylocation = googleMap.addMarker(markerOptionsmylocaiton);
LatLng latlang = new LatLng(curlat, curlong);
animateMarker(markermylocation, latlang, false);
}
So everytime mylocation is called the marker gets removed and calls mylocation method and then creates the marker in the new postition. Instead I would like to get a smooth transition of the marker like Google maps? How to implement this?
Update:
After working couple of times on this: I came to this code finally but then my markers are not showing up:
I am using the below method and calling this every time in myLocation method.
public void animateMarker(final Marker marker, final LatLng toPosition,
final boolean hideMarker)
{
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
Projection proj = googleMap.getProjection();
Point startPoint = proj.toScreenLocation(marker.getPosition());
final LatLng startLatLng = proj.fromScreenLocation(startPoint);
final long duration = 500;
final Interpolator interpolator = new LinearInterpolator();
handler.post(new Runnable()
{
@Override
public void run()
{
long elapsed = SystemClock.uptimeMillis() - start;
float t = interpolator.getInterpolation((float) elapsed
/ duration);
double lng = t * toPosition.longitude + (1 - t)
* startLatLng.longitude;
double lat = t * toPosition.latitude + (1 - t)
* startLatLng.latitude;
marker.setPosition(new LatLng(lat, lng));
if (t < 1.0)
{
// Post again 16ms later.
handler.postDelayed(this, 16);
}
else
{
if (hideMarker)
{
marker.setVisible(false);
}
else
{
marker.setVisible(true);
}
}
}
});
}
Thanks!
解决方案 You'll have to use an interpolator a linear or maybe an acceleration interpolator between the new latlng of the location and the current latlng of the marker. Here's an example with a bounce interpolator.
final Handler handler = new Handler();
final long start = SystemClock.uptimeMillis();
final long duration = 2500;
final Interpolator interpolator = new BounceInterpolator();
marker.setVisible(true);
handler.post(new Runnable() {
@Override
public void run() {
long elapsed = SystemClock.uptimeMillis() - start;
float t = Math.max(
1 - interpolator.getInterpolation((float) elapsed
/ duration), 0);
marker.setAnchor(0.5f, 1.0f + 6 * t);
marker.setPosition(latlng)
if (t > 0.0) {
// Post again 16ms later.
handler.postDelayed(this, 16);
}
}
});
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