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[英]Create markers from JSON array php mySQL Google Maps v2 android
[英]Create an array of markers Google Maps V2
下午好。 在我的應用程序中,我從數據庫中提取parse.com上標記的數據:
public void ParseQueryMap() {
ParseQuery query = new ParseQuery("MyObject");
query.findInBackground(new FindCallback() {
public void done(List<ParseObject> myObject, ParseException e) {
if (e == null) {
for ( int i = 0; i < myObject.size(); i++) {
commGet = myObject.get(i).getString("Comment");
geo1Dub = myObject.get(i).getParseGeoPoint("location").getLatitude();
geo2Dub = myObject.get(i).getParseGeoPoint("location").getLongitude();
Location aLocation = new Location("first");
aLocation.setLatitude(geo1Dub);
aLocation.setLongitude(geo2Dub);
Location bLocation = new Location("second");
bLocation.setLatitude(location.getLatitude());
bLocation.setLongitude(location.getLongitude());
int distance = (int)aLocation.distanceTo(bLocation);
if (distance<rad) { // where "rad" radius display points
myMap.addMarker(new MarkerOptions().position(new LatLng(geo1Dub,geo2Dub)).title(commGet) .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
} else {
}
}
} else {
Toast.makeText(MainActivity.this, "Error!", Toast.LENGTH_SHORT).show();
}
}
});
我想創建一個標記數組來測試它的大小,如果它是零,則顯示AlertDialog。 也就是說,我想知道我得了多少子彈。 謝謝您的幫助
更新:我想知道地圖上顯示了多少個標記
// before loop:
List<Marker> markers = new ArrayList<Marker>();
// inside your loop:
Marker marker = myMap.addMarker(new MarkerOptions().position(new LatLng(geo1Dub,geo2Dub))); //...
markers.add(marker);
// after loop:
markers.size();
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