当我们在谷歌地图android上有一个位置列表时，如何将标记从一个位置移动到另一个位置

Question

我正在创建带有多个标记的谷歌地图。现在我想在这些标记之间移动一个汽车图标。使用这个Move markers in google map v2 android

我可以将汽车图标从第一点移动到第二点。但它不会从第二点移动到第三点。当我为此使用 for 循环时，它会直接进入最后一点。我也添加了延迟，但没有其他效果我。

提前致谢。

这是我的代码::

public void setAnimation(GoogleMap myMap, final List<LatLng> directionPoint) {

        anim_map = myMap;


        anim_marker = myMap.addMarker(new MarkerOptions()
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.bus_icon))
                .position(directionPoint.get(0))
                .flat(true));


        myMap.animateCamera(CameraUpdateFactory.newLatLngZoom(directionPoint.get(0), 10));

        if (directionPoint.size() >= 2) {

            for (int i = 0; i < directionPoint.size() - 1; i++) {
                h.post(new Runnable() {
                    @Override
                    public void run() {
                        animateMarker(anim_map, anim_marker, directionPoint, false);



                    }
                });


            }

        }


    }

private void animateMarker(GoogleMap myMap, final Marker marker, final List<LatLng> directionPoint,
                               final boolean hideMarker) {

        final long start = SystemClock.uptimeMillis();
        final long duration = 350000;
        final Interpolator interpolator = new LinearInterpolator();


        h.post(new Runnable() {
            int i = 0;

            @Override
            public void run() {
                long elapsed = SystemClock.uptimeMillis() - start;
                float t = interpolator.getInterpolation((float) elapsed
                        / duration);

                //  Log.e("T Location", t + "");


                double lng = t * directionPoint.get(i + 1).longitude + (1 - t) * directionPoint.get(i).longitude;
                double lat = t * directionPoint.get(i + 1).latitude + (1 - t) * directionPoint.get(i).latitude;
                marker.setPosition(new LatLng(lat, lng));

                if (t < 1.0) {
                    h.postDelayed(this, 1);
                } else {
                    if (hideMarker) {
                        marker.setVisible(false);
                    } else {
                        marker.setVisible(true);
                    }
                }


            }
        });


    }

Answer 1

你可以试试这种方式，让标记在GoogleMap 中移动，类似于实时行车方向跟踪

    private Marker mCurrentMarker;
    private float ZOOMLEVEL=18.0f;
    private LatLng previousLatLon;
    private Handler mLocalHandler;
    private GoogleMap mGoogleMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mLocalHandler = new Handler();
        previousLatLon=new LatLng(45.320372, 2.460161);
        //Initialize Marker once Google Map object is created
        mMarkerOptions = new MarkerOptions().icon(BitmapDescriptorFactory.fromResource(R.drawable.custom_marker_icon));
        mMarkerOptions.position(previousLatLon);
        mCurrentMarker = mGoogleMap.addMarker(mMarkerOptions);


    }

    /**
     * Call this method to move marker in map to new location in map with updated location
     * @param marker
     * @param toPosition
     * @param fromPosition
     */
    public void animateMarker(final Marker marker, final LatLng toPosition,final LatLng fromPosition) {


        final long duration = 500;
        final Interpolator interpolator = new LinearInterpolator();

        mLocalHandler.post(new Runnable() {
            @Override
            public void run() {
                long elapsed = SystemClock.uptimeMillis() - mStartTime;
                float t = interpolator.getInterpolation((float) elapsed
                        / duration);
                marker.setPosition(toPosition);
                marker.setAnchor(Constants.MAPANCHOR, Constants.MAPANCHOR);
                mGoogleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(toPosition, ZOOMLEVEL));
                if (t < 1.0) {
                    // Post again 16ms later.
                    mLocalHandler.postDelayed(this, 16);
                } else {
                    marker.setVisible(true);
                }
                }
            }
        });
        previousLatLon=toPosition;// reassign the previous location to current location
    }

查看我的回答了解更多详情here

在你的情况下，在 for 循环之后休眠几毫秒

for (int i = 0; i < directionPoint.size() - 1; i++) {
try {
 Thread.sleep(5000);
} catch (InterruptedException e) 
{
 e.printStackTrace();
}
// rest of your code

Answer 2

最后，我想出了这个答案。 我们必须根据 arraylist 的大小更新所有值。

  public void setAnimation(GoogleMap myMap, final List<LatLng> directionPoint) {

        anim_map = myMap;


        anim_marker = myMap.addMarker(new MarkerOptions()
                .icon(BitmapDescriptorFactory.fromResource(R.drawable.bus_icon))
                .position(directionPoint.get(0))
                .flat(true));


        myMap.animateCamera(CameraUpdateFactory.newLatLngZoom(directionPoint.get(0), 10));


        animateMarker(anim_map, anim_marker, directionPoint, false);


    }

    private void animateMarker(GoogleMap myMap, final Marker marker, final List<LatLng> directionPoint,
                               final boolean hideMarker) {

        final long start = SystemClock.uptimeMillis();
        long duration = 3500;
        final Interpolator interpolator = new LinearInterpolator();

        float t = 0;

        for (int j = 0; j < directionPoint.size() - 1; j++) {
            Log.e("Location Value", j + " " + directionPoint.get(j).latitude + ", " + directionPoint.get(j).longitude + " : " + directionPoint.get(j + 1).latitude + ", " + directionPoint.get(j + 1).longitude);
            while (t < j + 1) {
                t = t - j;
                double lng = t * directionPoint.get(j + 1).longitude + (1 - t) * directionPoint.get(j).longitude;
                double lat = t * directionPoint.get(j + 1).latitude + (1 - t) * directionPoint.get(j).latitude;
                LatList.add(new LatLng(lat, lng));
                long elapsed = SystemClock.uptimeMillis() - start;
                t = interpolator.getInterpolation((float) elapsed / duration);
            }
        }
        Log.e("LatList value", LatList.size() + "");
        h.post(new Runnable() {
            int i = 0;

            @Override
            public void run() {
                marker.setPosition(LatList.get(i));
                if ((LatList.size() - 1) > i)
                    h.postDelayed(this, 1);
                Log.e("I value", i + "");
                i++;
            }
        });


    }