当您到达标记物10米以内时，如何开始某种方法？

如何解决当您到达标记物10米以内时，如何开始某种方法？

我需要制作带有地图和一些标记的android应用。当我到达标记的10米以内时，它变得可单击，并在单击时播放音轨，然后更改标记图标并显示另一个标记。我尝试使用地理围栏，但无法更改图标或从BroadcastReciever或其他活动或服务调用MediaPlayer。

标记-地理围栏的中心。

问题：

当地理围栏触发时，如何更改标记的图标并开始音轨？

在MapsActivity中添加地理围栏

private void createGeofences(){
        if (Build.VERSION.SDK_INT >= 29) {
            //We need background permission
            if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_BACKGROUND_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                for (int i=0; i < ARRAY_SIZE; i++){
                    addGeofence(latLngArray[i],GEOFENCE_RADIUS,Integer.toString(i));
                }
            }
            } else {
                if (ActivityCompat.shouldShowRequestPermissionRationale(this,Manifest.permission.ACCESS_BACKGROUND_LOCATION)) {
                    //We show a dialog and ask for permission
                    ActivityCompat.requestPermissions(this,new String[] {Manifest.permission.ACCESS_BACKGROUND_LOCATION},BACKGROUND_LOCATION_ACCESS_REQUEST_CODE);
                } else {
                    ActivityCompat.requestPermissions(this,BACKGROUND_LOCATION_ACCESS_REQUEST_CODE);
                }
            }

    }

     private void addGeofence(LatLng latLng,float radius,String id){
        Geofence geofence = GeofenceHelper.getGeofence(id,latLng,radius,Geofence.GEOFENCE_TRANSITION_ENTER);
        GeofencingRequest geofencingRequest = geofenceHelper.getGeofencingRequest(geofence);
        PendingIntent pendingIntent = geofenceHelper.getPendingIntent();
        if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            geofencingClient.addGeofences(geofencingRequest,pendingIntent)
                    .addOnSuccessListener(new OnSuccessListener<Void>() {
                        @Override
                        public void onSuccess(Void aVoid) {
                            Log.d(TAG,"onSuccess: Geofence Added...");
                        }
                    })
            .addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    String errorMessage = GeofenceHelper.getErrorString(e);
                    Log.d(TAG,"onFailure: " + errorMessage);
                }
            });
        }
    }

GeofenceHelper.class

public class GeofenceHelper extends ContextWrapper {

    private static final int loiteringDelay = 0;

    private static final String TAG = "GeofenceHelper";
    PendingIntent pendingIntent;


    public GeofenceHelper(Context base) {
        super(base);
    }

    public GeofencingRequest getGeofencingRequest(Geofence geofence){

        return new GeofencingRequest.Builder()
                .addGeofence(geofence)
                .setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER)
                .build();
    }

    public static Geofence getGeofence(String ID,LatLng latLng,int transitionTypes){
        return new Geofence.Builder()
                .setCircularRegion(latLng.latitude,latLng.longitude,radius)
                .setRequestId(ID)
                .setTransitionTypes(transitionTypes)
                .setLoiteringDelay(loiteringDelay)
                .setExpirationDuration(Geofence.NEVER_EXPIRE)
                .build();
    }

    public PendingIntent getPendingIntent(){
        if(pendingIntent != null){
            return pendingIntent;
        }
        Intent intent = new Intent(this,GeofenceBroadcastReceiver.class);
        pendingIntent = PendingIntent.getBroadcast(this,956,intent,PendingIntent.FLAG_UPDATE_CURRENT);

        return pendingIntent;
    }

    public static String getErrorString(Exception e) {
        if (e instanceof ApiException) {
            ApiException apiException = (ApiException) e;
            switch (apiException.getStatusCode()) {
                case GeofenceStatusCodes
                        .GEOFENCE_NOT_AVAILABLE:
                    return "GEOFENCE_NOT_AVAILABLE";
                case GeofenceStatusCodes
                        .GEOFENCE_TOO_MANY_GEOFENCES:
                    return "GEOFENCE_TOO_MANY_GEOFENCES";
                case GeofenceStatusCodes
                        .GEOFENCE_TOO_MANY_PENDING_INTENTS:
                    return "GEOFENCE_TOO_MANY_PENDING_INTENTS";
            }
        }
        return e.getLocalizedMessage();
    }
}

GeofenceBroadcastReciever.class

public class GeofenceBroadcastReceiver extends BroadcastReceiver {
    private static final String TAG = "GeofenceBroadcastReceiv";

    //MediaPlayer mediaPlayer;

    @Override
    public void onReceive(Context context,Intent intent) {
        // an Intent broadcast.


        GeofencingEvent geofencingEvent = GeofencingEvent.fromIntent(intent);

        if (geofencingEvent.hasError()) {
            Log.d(TAG,"onReceive: Error receiving geofence event...");
            return;
        };


        List<Geofence> geofenceList = geofencingEvent.getTriggeringGeofences();
        String id = geofenceList.get(0).getRequestId();

        switch (id){
            case "0":
                Toast.makeText(context,"Geofence " + id + " triggered.",Toast.LENGTH_SHORT).show();
            case "1":
                Toast.makeText(context,Toast.LENGTH_SHORT).show();
            case "2":
                Toast.makeText(context,Toast.LENGTH_SHORT).show();
            case "3":
                Toast.makeText(context,Toast.LENGTH_SHORT).show();
            case "4":
                Toast.makeText(context,Toast.LENGTH_SHORT).show();
            case "5":
                Toast.makeText(context,Toast.LENGTH_SHORT).show();
        }

    }
}

解决方法

MediaPlayer需要上下文好了，您可以将上下文传递给广播接收器。我假设（因为尚未显示）您在上下文的Activity或App中注册了广播接收器。多种解决方案：

您的广播接收者可以是您活动的内部类，也可以是匿名类，在两种情况下，广播接收者都将引用包装类（MapsActivity.this）。
将Context作为构造函数参数传递给广播接收器。当您希望它成为一流的产品并在多个地方重复使用时很有用。
在广播接收器的构造函数中传递回调（某些FunctionalInterface，例如Consumer<Integer> onCheckpointReached）。

根据动态访问特定音轨的方法，您不应使用此类开关，而应动态获取资源，确切的解决方案（甚至带有声音！）在这里：https://stackoverflow.com/a/7182576/9274948

旁注：您的switch (apiException.getStatusCode()) {并没有多大意义，只需使用apiException.getStatusCode().name()或apiException.getStatusCode().toString()。

当您到达标记物10米以内时，如何开始某种方法？

如何解决当您到达标记物10米以内时，如何开始某种方法？

问题：

解决方法

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