我编写了将在地图上显示地理围栏的应用程序。现在，我设法创建了一个在地图上显示的地理围栏。我的问题是如何转换代码，以便可以显示多个地理围栏？我是这个主题的新手，有人可以帮我解释如何做吗？下面我放置了两个我要使用的类。
MainActivity：
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private static final String TAG = "MainActivity";
private static final int REQUEST_LOCATION_PERMISSION_CODE = 101;
private GoogleMap googleMap;
protected ArrayList<Geofence> mGeofenceList;
private GeofencingRequest geofencingRequest;
private GoogleApiClient googleApiClient;
private boolean isMonitoring = false;
private MarkerOptions markerOptions;
private Marker currentLocationMarker;
private PendingIntent pendingIntent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
mGeofenceList = new ArrayList<Geofence>();
googleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this).build();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, REQUEST_LOCATION_PERMISSION_CODE);
}
}
@NonNull
private Geofence getGeofence() {
LatLng latLng = Constants.AREA_LANDMARKS.get(Constants.GEOFENCE_ID_STAN_UNI);
return new Geofence.Builder()
.setRequestId(Constants.GEOFENCE_ID_STAN_UNI)
.setExpirationDuration(Geofence.NEVER_EXPIRE)
.setCircularRegion(latLng.latitude, latLng.longitude, Constants.GEOFENCE_RADIUS_IN_METERS)
.setNotificationResponsiveness(1000)
.setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER | Geofence.GEOFENCE_TRANSITION_EXIT)
.build();
}
@Override
protected void onResume() {
super.onResume();
int response = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(MainActivity.this);
if (response != ConnectionResult.SUCCESS) {
Log.d(TAG, "Google Play Service Not Available");
GoogleApiAvailability.getInstance().getErrorDialog(MainActivity.this, response, 1).show();
} else {
Log.d(TAG, "Google play service available");
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
this.googleMap = googleMap;
LatLng latLng = Constants.AREA_LANDMARKS.get(Constants.GEOFENCE_ID_STAN_UNI);
googleMap.addMarker(new MarkerOptions().position(latLng).title("Stanford University"));
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 17f));
googleMap.setMyLocationEnabled(true);
Circle circle = googleMap.addCircle(new CircleOptions()
.center(new LatLng(latLng.latitude, latLng.longitude))
.radius(Constants.GEOFENCE_RADIUS_IN_METERS)
.strokeColor(Color.RED)
.strokeWidth(4f));
}
}
第二个类是常量，我在其中存储地理围栏的纬度和经度。
package com.app.androidkt.geofencing;
import com.google.android.gms.maps.model.LatLng;
import java.util.HashMap;
public class Constants {
public static final String GEOFENCE_ID_STAN_UNI = "STAN_UNI";
public static final float GEOFENCE_RADIUS_IN_METERS = 100;
/**
* Map for storing information about stanford university in the Stanford.
*/
public static final HashMap<String, LatLng> AREA_LANDMARKS = new HashMap<String, LatLng>();
static {
// stanford university.
AREA_LANDMARKS.put(GEOFENCE_ID_STAN_UNI, new LatLng(37.427025, -122.170425));
}
}
我的应用程序如下所示： enter image description here
