我有一个谷歌地图,我想做的是使用geoQuery每15秒从Firebase刷新标记,这意味着我会使用以下方法删除所有先前的标记并添加新的标记:
private void downloadExtraPrinters(LatLng viewCenter, int viewRadius) {
try {
final GeoQuery geoQuery = geoFire.queryAtLocation(new GeoLocation(viewCenter.latitude,viewCenter.longitude), viewRadius);
geoQuery.addGeoQueryEventListener(new GeoQueryEventListener() {
@Override
public void onKeyEntered(String key, GeoLocation location) {
try{
MyItem myItem = new MyItem(location.latitude, location.longitude);
if (!items.contains(myItem)) {
items.add(myItem);
}
}catch (ClassCastException e){
}
}
@Override
public void onKeyExited(String key) {
}
@Override
public void onKeyMoved(String key, GeoLocation location) {
}
@Override
public void onGeoQueryReady() {
parseJsonToList();
}
@Override
public void onGeoQueryError(DatabaseError error) {
}
});
}catch (NullPointerException e){
}
}
parseJsonToList方法:
private void parseJsonToList() {
itemss = clusterManagerAlgorithm.getItems();
try {
items.removeAll(itemss);
}catch (IndexOutOfBoundsException e){
Log.d("itemsDoesn't exist"," : ");
}
mClusterManager.clearItems(); // I Think the problem is in this 3 lines of code.
mClusterManager.cluster(); // I also tried addItems(items) before clustering i still getting the same problem.
mClusterManager.addItems(items);
}
我的问题是,每次我想要清除并重新加载数据时,所有的标记都会消失15秒钟,直到parseJsonToList方法的下一次调用,然后所有标记在15秒后再次出现。
@Override
protected void onStart() {
super.onStart();
timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
Log.d("timer","executed");
if (viewCenter != null) {
downloadExtraPrinters(viewCenter, viewRadius);
Log.d("download","newData");
}
}
}, 0, 15000); // all data reloaded every 15s.
}
这里是我的Item类:
public class MyItem implements ClusterItem {
private final LatLng mPosition;
public MyItem(double lat, double lng) {
mPosition = new LatLng(lat, lng);
}
@Override
public LatLng getPosition() {
return mPosition;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
MyItem item = (MyItem) o;
return Objects.equals(mPosition, item.mPosition);
}
@Override
public int hashCode() {
return Objects.hash(mPosition);
}
}
我想要的是能够立即更改标记,而不需要等待15秒钟后才出现。我已经为这个问题苦恼了2周,请帮忙解决!