我正在尝试在Google地图的左上角显示一个TextView,告诉用户他们距离特定标记点位置有x距离,例如“您靠近A位置”,但仅在范围内时显示TextView。如果他们移出范围,TextView将消失。
我知道Google Places API会显示所有附近的位置,但我只想在用户距离它们x距离时显示地图上标记的附近位置。
我该如何实现这一点?我是否仍需要使用Google Places API?
我的类.java:
有人能指点我方向吗?谢谢。
我知道Google Places API会显示所有附近的位置,但我只想在用户距离它们x距离时显示地图上标记的附近位置。
我该如何实现这一点?我是否仍需要使用Google Places API?
我的类.java:
private GoogleMap mMap;
private LatLng currLocation;
private static final LatLng POINTA = new LatLng(32.820193, -117.232568);
private static final LatLng POINTB = new LatLng(32.829129, -117.232204);
private static final LatLng POINTC = new LatLng(32.821114, -117.231534);
private static final LatLng POINTD = new LatLng(32.825157, -117.232003);
// Array to store hotspot coordinates
private ArrayList<LatLng> markerCoords = new ArrayList<LatLng>();
private static final int POINTS = 4;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
setUpMapIfNeeded();
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Create MenuInflater object to insert ActionBar buttons
MenuInflater inflater = getMenuInflater();
// Display the ActionBar buttons from .xml
inflater.inflate(R.menu.menu_map, menu);
return true;
}
@Override
protected void onResume()
{
super.onResume();
setUpMapIfNeeded();
}
private void setUpMapIfNeeded()
{
if (mMap == null)
{
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null)
{
markerCoords.add(POINTA);
markerCoords.add(POINTB);
markerCoords.add(POINTC);
markerCoords.add(POINTD);
setUpMap();
}
}
}
private void setUpMap()
{
// Set My Location blue dot
mMap.setMyLocationEnabled(true);
LocationManager locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
String provider = locationManager.getBestProvider(criteria, true);
Location myLocation = locationManager.getLastKnownLocation(provider);
if (myLocation != null)
{
double latitude = myLocation.getLatitude();
double longitude = myLocation.getLongitude();
currLocation = new LatLng(latitude, longitude);
}
for (int i = 0; i < POINTS; i++)
{
mMap.addMarker(new MarkerOptions()
.position(markerCoords.get(i))
.icon(BitmapDescriptorFactory.fromResource(R.drawable.post_it_marker)));
}
}
map.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<fragment
xmlns:map="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
map:cameraTargetLat="32.881416"
map:cameraTargetLng="-117.237428"
map:cameraZoom="15"
map:mapType="normal" />
</RelativeLayout>
有人能指点我方向吗?谢谢。