我在用Java开发应用程序方面仍然很陌生。一切都很顺利，直到我遇到问题。停止和（R.id.map））.getMap上受保护的空隙下的断开连接，因为它出现一个错误，指出无法解决断开连接的方法，并且无法重新创建地图的符号。我目前正在研究 http://paulusworld.com/technical/android-geofences 如果有人决定要看一看，这是一个很棒的教程:)谢谢你们的建议！
package com.google.android.gms.location.sample.geofencing;
import java.util.ArrayList;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.Geofence;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnCameraChangeListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
public class MainActivity extends FragmentActivity implements OnCameraChangeListener {
/**
* Google Map object
*/
private GoogleMap mMap;
/**
* Geofence Data
*/
/**
* Geofences Array
*/
ArrayList<Geofence> mGeofences;
/**
* Geofence Coordinates
*/
ArrayList<LatLng> mGeofenceCoordinates;
/**
* Geofence Radius'
*/
ArrayList<Integer> mGeofenceRadius;
/**
* Geofence Store
*/
private GeofenceStore mGeofenceStore;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
// Initializing variables
mGeofences = new ArrayList<Geofence>();
mGeofenceCoordinates = new ArrayList<LatLng>();
mGeofenceRadius = new ArrayList<Integer>();
// Adding geofence coordinates to array.
mGeofenceCoordinates.add(new LatLng(43.042861, -87.911559));
mGeofenceCoordinates.add(new LatLng(43.042998, -87.909753));
mGeofenceCoordinates.add(new LatLng(43.040732, -87.921364));
mGeofenceCoordinates.add(new LatLng(43.039912, -87.897038));
// Adding associated geofence radius' to array.
mGeofenceRadius.add(100);
mGeofenceRadius.add(50);
mGeofenceRadius.add(160);
mGeofenceRadius.add(160);
// Bulding the geofences and adding them to the geofence array.
// Performing Arts Center
mGeofences.add(new Geofence.Builder()
.setRequestId("Performing Arts Center")
// The coordinates of the center of the geofence and the radius in meters.
.setCircularRegion(mGeofenceCoordinates.get(0).latitude, mGeofenceCoordinates.get(0).longitude, mGeofenceRadius.get(0).intValue())
.setExpirationDuration(Geofence.NEVER_EXPIRE)
// Required when we use the transition type of GEOFENCE_TRANSITION_DWELL
.setLoiteringDelay(30000)
.setTransitionTypes(
Geofence.GEOFENCE_TRANSITION_ENTER
| Geofence.GEOFENCE_TRANSITION_DWELL
| Geofence.GEOFENCE_TRANSITION_EXIT).build());
// Starbucks
mGeofences.add(new Geofence.Builder()
.setRequestId("Starbucks")
// The coordinates of the center of the geofence and the radius in meters.
.setCircularRegion(mGeofenceCoordinates.get(1).latitude, mGeofenceCoordinates.get(1).longitude, mGeofenceRadius.get(1).intValue())
.setExpirationDuration(Geofence.NEVER_EXPIRE)
// Required when we use the transition type of GEOFENCE_TRANSITION_DWELL
.setLoiteringDelay(30000)
.setTransitionTypes(
Geofence.GEOFENCE_TRANSITION_ENTER
| Geofence.GEOFENCE_TRANSITION_DWELL
| Geofence.GEOFENCE_TRANSITION_EXIT).build());
// Milwaukee Public Museum
mGeofences.add(new Geofence.Builder()
.setRequestId("Milwaukee Public Museum")
// The coordinates of the center of the geofence and the radius in meters.
.setCircularRegion(mGeofenceCoordinates.get(2).latitude, mGeofenceCoordinates.get(2).longitude, mGeofenceRadius.get(2).intValue())
.setExpirationDuration(Geofence.NEVER_EXPIRE)
.setTransitionTypes(
Geofence.GEOFENCE_TRANSITION_ENTER
| Geofence.GEOFENCE_TRANSITION_EXIT).build());
// Milwaukee Art Museum
mGeofences.add(new Geofence.Builder()
.setRequestId("Milwaukee Art Museum")
// The coordinates of the center of the geofence and the radius in meters.
.setCircularRegion(mGeofenceCoordinates.get(3).latitude, mGeofenceCoordinates.get(3).longitude, mGeofenceRadius.get(3).intValue())
.setExpirationDuration(Geofence.NEVER_EXPIRE)
.setTransitionTypes(
Geofence.GEOFENCE_TRANSITION_ENTER
| Geofence.GEOFENCE_TRANSITION_EXIT).build());
// Add the geofences to the GeofenceStore object.
mGeofenceStore = new GeofenceStore(this, mGeofences);
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onStop() {
mGeofenceStore.disconnect();
super.onStop();
}
@Override
protected void onResume() {
super.onResume();
if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(this) == ConnectionResult.SUCCESS) {
setUpMapIfNeeded();
} else {
GooglePlayServicesUtil.getErrorDialog(
GooglePlayServicesUtil.isGooglePlayServicesAvailable(this),
this, 0);
}
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the
// map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
/**
* This is where we can add markers or lines, add listeners or move the
* camera. In this case, we just add a marker near Africa.
* <p/>
* This should only be called once and when we are sure that {@link #mMap}
* is not null.
*/
private void setUpMap() {
// Centers the camera over the building and zooms int far enough to
// show the floor picker.
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(
43.039634, -87.908395), 14));
// Hide labels.
mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mMap.setIndoorEnabled(false);
mMap.setMyLocationEnabled(true);
mMap.setOnCameraChangeListener(this);
}
@Override
public void onCameraChange(CameraPosition position) {
// Makes sure the visuals remain when zoom changes.
for(int i = 0; i < mGeofenceCoordinates.size(); i++) {
mMap.addCircle(new CircleOptions().center(mGeofenceCoordinates.get(i))
.radius(mGeofenceRadius.get(i).intValue())
.fillColor(0x40ff0000)
.strokeColor(Color.TRANSPARENT).strokeWidth(2));
}
}
}
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