我真的陷入了这一点。当应用程序处于forground时，地理位置确实正常，通知正常。但当应用程序进入后台通知时，不会出现。
我希望这样当应用程序处于后台我的地理位置永不过期时，如果用户不在屏障范围内，我会收到通知。
还附上以下代码： -
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener,
ResultCallback<Status> {
protected static final int REQUEST_CHECK_SETTINGS = 0x1;
GoogleApiClient googleApiClient;
private MapFragment mapFragment;
private static final String TAG = MainActivity.class.getSimpleName();
private GoogleMap map;
private Location lastLocation;
private static final String NOTIFICATION_MSG = "NOTIFICATION MSG";
SharedPreferences pref;
SharedPreferences.Editor editor;
public static Intent makeNotificationIntent(Context context, String msg) {
Intent intent = new Intent(context, MainActivity.class);
intent.putExtra(NOTIFICATION_MSG, msg);
return intent;
}
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_geofence);
pref = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);
editor = pref.edit();
initGMaps();
createGoogleApi();
}
private void initGMaps() {
//mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map);
//mapFragment.getMapAsync(this);
}
private void createGoogleApi() {
Log.d(TAG, "createGoogleApi()");
if (googleApiClient == null) {
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
}
@Override
protected void onStart() {
super.onStart();
googleApiClient.connect();
settingsrequest();
}
public void settingsrequest() {
LocationRequest locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(30 * 1000);
locationRequest.setFastestInterval(5 * 1000);
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(locationRequest);
builder.setAlwaysShow(true); //this is the key ingredient
PendingResult<LocationSettingsResult> result =
LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult(LocationSettingsResult result) {
final Status status = result.getStatus();
final LocationSettingsStates state = result.getLocationSettingsStates();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
// All location settings are satisfied. The client can initialize location
// requests here.
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied. But could be fixed by showing the user
// a dialog.
try {
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
status.startResolutionForResult(MainActivity.this, REQUEST_CHECK_SETTINGS);
} catch (IntentSender.SendIntentException e) {
// Ignore the error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// Location settings are not satisfied. However, we have no way to fix the
// settings so we won't show the dialog.
break;
}
}
});
}
@Override
protected void onStop() {
super.onStop();
// Disconnect GoogleApiClient when stopping Activity
googleApiClient.disconnect();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
// Check for the integer request code originally supplied to startResolutionForResult().
case REQUEST_CHECK_SETTINGS:
switch (resultCode) {
case Activity.RESULT_OK:
startLocationUpdates();
break;
case Activity.RESULT_CANCELED:
settingsrequest();//keep asking if imp or do whatever
break;
}
break;
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
// googleApiClient.disconnect();
Log.i(TAG, "onConnected()");
getLastKnownLocation();
//recoverGeofenceMarker();
startGeofence();
}
private final int REQ_PERMISSION = 999;
// Check for permission to access Location
private boolean checkPermission() {
Log.d(TAG, "checkPermission()");
// Ask for permission if it wasn't granted yet
return (ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED);
}
// Asks for permission
private void askPermission() {
Log.d(TAG, "askPermission()");
ActivityCompat.requestPermissions(
this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
REQ_PERMISSION
);
}
private void getLastKnownLocation() {
Log.d(TAG, "getLastKnownLocation()");
if (checkPermission()) {
lastLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
if (lastLocation != null) {
Log.i(TAG, "LasKnown location. " +
"Long: " + lastLocation.getLongitude() +
" | Lat: " + lastLocation.getLatitude());
writeLastLocation();
startLocationUpdates();
} else {
Log.w(TAG, "No location retrieved yet");
startLocationUpdates();
}
} else askPermission();
}
private void writeActualLocation(Location location) {
//textLat.setText("Lat: " + location.getLatitude());
//textLong.setText("Long: " + location.getLongitude());
markerLocation(new LatLng(location.getLatitude(), location.getLongitude()));
}
private void writeLastLocation() {
writeActualLocation(lastLocation);
}
private Marker locationMarker;
private void markerLocation(LatLng latLng) {
Log.i(TAG, "markerLocation(" + latLng + ")");
String title = latLng.latitude + ", " + latLng.longitude;
MarkerOptions markerOptions = new MarkerOptions()
.position(latLng)
.title(title);
if (map != null) {
if (locationMarker != null)
locationMarker.remove();
locationMarker = map.addMarker(markerOptions);
float zoom = 14f;
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, zoom);
map.animateCamera(cameraUpdate);
}
}
// Start Geofence creation process
private void startGeofence() {
Log.i(TAG, "startGeofence()");
Geofence geofence = createGeofence();
GeofencingRequest geofenceRequest = createGeofenceRequest(geofence);
addGeofence(geofenceRequest);
}
private static final long GEO_DURATION = 60 * 60 * 1000;
private static final String GEOFENCE_REQ_ID = "My Geofence";
private static final float GEOFENCE_RADIUS = 500.0f; // in meters
// Create a Geofence
private Geofence createGeofence() {
Log.d(TAG, "createGeofence");
//Intent i = getIntent();
//double la = i.getDoubleExtra("latitude", 0);
//double lo = i.getDoubleExtra("longitude", 0);
return new Geofence.Builder()
.setRequestId(GEOFENCE_REQ_ID)
.setCircularRegion(18.457532, 73.867746, GEOFENCE_RADIUS)
.setExpirationDuration(Geofence.NEVER_EXPIRE)
.setTransitionTypes(Geofence.GEOFENCE_TRANSITION_EXIT)
.build();
}
// Create a Geofence Request
private GeofencingRequest createGeofenceRequest(Geofence geofence) {
Log.d(TAG, "createGeofenceRequest");
return new GeofencingRequest.Builder()
.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_EXIT)
.addGeofence(geofence)
.build();
}
private PendingIntent geoFencePendingIntent;
private static final int GEOFENCE_REQ_CODE = 0;
private PendingIntent createGeofencePendingIntent() {
Log.d(TAG, "createGeofencePendingIntent");
if (geoFencePendingIntent != null)
return geoFencePendingIntent;
Intent intent = new Intent("com.aol.android.geofence.ACTION_RECEIVE_GEOFENCE");
return PendingIntent.getBroadcast(
this, GEOFENCE_REQ_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}
// Add the created GeofenceRequest to the device's monitoring list
private void addGeofence(GeofencingRequest request) {
Log.d(TAG, "addGeofence");
if (checkPermission())
LocationServices.GeofencingApi.addGeofences(
googleApiClient,
request,
createGeofencePendingIntent()
).setResultCallback(this);
}
@Override
public void onConnectionSuspended(int i) {
Log.w(TAG, "onConnectionSuspended()");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
Log.w(TAG, "onConnectionFailed()");
}
private LocationRequest locationRequest;
// Defined in mili seconds.
// This number in extremely low, and should be used only for debug
private final int UPDATE_INTERVAL = 1000;
private final int FASTEST_INTERVAL = 900;
// Start location Updates
private void startLocationUpdates() {
Log.i(TAG, "startLocationUpdates()");
locationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(UPDATE_INTERVAL)
.setFastestInterval(FASTEST_INTERVAL);
if (checkPermission())
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
}
@Override
public void onLocationChanged(Location location) {
Log.d(TAG, "onLocationChanged [" + location + "]");
lastLocation = location;
writeActualLocation(location);
}
@Override
public void onResult(@NonNull Status status) {
Log.i(TAG, "onResult: " + status);
if (status.isSuccess()) {
// saveGeofence();
//drawGeofence();
} else {
// inform about fail
}
}
}
还附上了收件人代码： -
public class GeofenceReciever extends BroadcastReceiver {
private static final String TAG = "BootReceiver";
Context contextBootReceiver;
Intent intent;
public static final int GEOFENCE_NOTIFICATION_ID = 0;
SharedPreferences pref;
SharedPreferences.Editor editor;
@Override
public void onReceive(Context context, Intent intent) {
this.contextBootReceiver = context;
this.intent = intent;
pref = PreferenceManager.getDefaultSharedPreferences(context);
editor = pref.edit();
GeofencingEvent geofencingEvent = GeofencingEvent.fromIntent(intent);
// Handling errors
if (geofencingEvent.hasError()) {
String errorMsg = getErrorString(geofencingEvent.getErrorCode());
Log.e(TAG, errorMsg);
return;
}
int geoFenceTransition = geofencingEvent.getGeofenceTransition();
// Check if the transition type is of interest
if (geoFenceTransition == Geofence.GEOFENCE_TRANSITION_EXIT) {
// Get the geofence that were triggered
Log.d("Trnsition", "Exited");
List<Geofence> triggeringGeofences = geofencingEvent.getTriggeringGeofences();
String geofenceTransitionDetails = getGeofenceTrasitionDetails(geoFenceTransition, triggeringGeofences);
// Send notification details as a String
//if (feedback.equalsIgnoreCase("F;1;")) {
// String temp = feedback;
sendNotification(geofenceTransitionDetails);
}
}
private String getGeofenceTrasitionDetails(int geoFenceTransition, List<Geofence> triggeringGeofences) {
// get the ID of each geofence triggered
ArrayList<String> triggeringGeofencesList = new ArrayList<>();
for (Geofence geofence : triggeringGeofences) {
triggeringGeofencesList.add(geofence.getRequestId());
}
String status = "Some switches are on";
if (geoFenceTransition == Geofence.GEOFENCE_TRANSITION_ENTER)
System.out.println(status);
return status + TextUtils.join(", ", triggeringGeofencesList);
}
private void sendNotification(String msg) {
//intent = new Intent(contextBootReceiver, MainActivity.class);
//intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
//intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
//contextBootReceiver.startActivity(intent);
Log.i(TAG, "sendNotification: " + msg);
// Intent to start the main Activity
Intent notificationIntent = MainActivity.makeNotificationIntent(
contextBootReceiver, msg
);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(contextBootReceiver);
stackBuilder.addParentStack(MainActivity.class);
stackBuilder.addNextIntent(notificationIntent);
PendingIntent notificationPendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
// Creating and sending Notification
NotificationManager notificatioMng =
(NotificationManager) contextBootReceiver.getSystemService(Context.NOTIFICATION_SERVICE);
notificatioMng.notify(
GEOFENCE_NOTIFICATION_ID,
createNotification(msg, notificationPendingIntent));
}
// Create notification
private Notification createNotification(String msg, PendingIntent notificationPendingIntent) {
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(contextBootReceiver);
notificationBuilder
.setSmallIcon(R.drawable.ic_action_location)
.setColor(Color.RED)
.setContentTitle(msg)
.setContentText("Droidhomes Notification!")
.setContentIntent(notificationPendingIntent)
.setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE | Notification.DEFAULT_SOUND)
.setAutoCancel(true);
return notificationBuilder.build();
}
private static String getErrorString(int errorCode) {
switch (errorCode) {
case GeofenceStatusCodes.GEOFENCE_NOT_AVAILABLE:
return "GeoFence not available";
case GeofenceStatusCodes.GEOFENCE_TOO_MANY_GEOFENCES:
return "Too many GeoFences";
case GeofenceStatusCodes.GEOFENCE_TOO_MANY_PENDING_INTENTS:
return "Too many pending intents";
default:
return "Unknown error.";
}
}
}
答案 0 :(得分：0)
按照以下方式编写您的服务：
public class GeoFencingService extends Service{
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
//write your notification code here
//use START_STICKY if you want your service keep running else use START_NOT_STICKY
return Service.START_STICKY;
}
@Override
public IBinder onBind(Intent intent) {
//use this method to communicate with your activity
return null;
}
}
详细解释请看这两个链接：
https://developer.android.com/guide/components/services.html
http://www.vogella.com/tutorials/AndroidServices/article.html
如果需要更多帮助，请告诉我