Question

我需要能够使用Here map android sdk显示移动的汽车。在当前版本中是否可能？我尝试删除并在渲染类循环逻辑中添加地图标记对象，如下所示;

// this is a render like loop which is called in each 1 secs
public void update(Map map, float deltaTime) {

    float displacement = mCars.get(0).getVelocity() * deltaTime;
    float delta = displacement / ((float) Math.sqrt(2));

    MapMarker mapMarker = new MapMarker();
    Image image = new Image();
    image.setBitmap(mCars.get(0).getIcon().toBitmap());
    mapMarker.setCoordinate(mCars.get(0).getCoordinate());
    mapMarker.setIcon(image);

    // remove old coordinate
    map.removeMapObject(mapMarker);

    mCars.get(0).addDelta(delta);
    mapMarker.setCoordinate(mCars.get(0).getCoordinate());

    map.addMapObject(mapMarker);
}

removeMapObject()似乎无法正常工作。有移动地图对象的想法吗？

Answer 1

这里的问题是创建每个标记并删除它们并重新添加它们。渲染循环如下;

@Override
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.button1:
            // button 1 is click
            break;
        case R.id.button2:
            // button 2 is click
            break;
        case R.id.button3:
            // button 3 is click
            break;
        default:
            break;
    }
}

// this is a render like loop which is called in each 1 secs public void update(Map map, float deltaTime) { Timber.d("Before coordinate: %f %f", mCars.get(0).getCoordinate().getLatitude(), mCars.get(0).getCoordinate().getLongitude()); map.removeMapObject(mCars.get(0).getMarker()); mCars.get(0).addDelta(deltaTime); map.addMapObject(mCars.get(0).getMarker()); Timber.d("Update call, delta time: %f", deltaTime); }调用应更新标记坐标及其自己的坐标;

addDelta()

最后，public void addDelta(float deltaTime) { if (mDestination.equals(mCoordinate)) { return; } double deltaLatitude = mDestination.getLatitude() - mCoordinate.getLatitude(); double deltaLongitude = mDestination.getLongitude() - mCoordinate.getLongitude(); double lat = getCoordinate().getLatitude() + (0.01 * deltaLatitude); double lng = getCoordinate().getLongitude() + (0.01 * deltaLongitude); mCoordinate.setLatitude(lat); mCoordinate.setLongitude(lng); updateMarker(); }实施如下;

updateMarker

android这里sdk移动标记

1 个答案: