Question

我正在实施地理围栏，并且我的地理围栏位置存储在Firebase中。基本上，我的目标是检索所有存储的地理围栏并将它们放入geofenceList中，这是私有列表geofenceList = new ArrayList <>（）;

private GeofencingRequest getGeofencingRequest() {
    GeofencingRequest.Builder builder = new GeofencingRequest.Builder();
    builder.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER);
    builder.addGeofences(geofenceList);
    return builder.build();
}

此代码给我一个错误，因为“ java.lang.IllegalArgumentException：未向此请求添加地理围栏” ，并且看来我的geofenceList为空。但是，当执行以下操作时，我确保添加了geofenceList：

从Firebase（在OnCreate内部）检索地理围栏

final DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference();

databaseReference.child(MyDatabase.USERS).addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
        mGeoFenceList = new MyDatabase(ListActivity.this, databaseReference).readSnapshot(dataSnapshot);
        adapter.updateData(mGeoFenceList);
        for (int i = 0; i < mGeoFenceList.size(); i++) {
            MyLocation location = mGeoFenceList.get(i);
            buildGeofence(location);
        }
    }

    @Override
    public void onCancelled(@NonNull DatabaseError databaseError) {}
});

然后转到buildGeofence（location）

public void buildGeofence(MyLocation entry) {
geofenceList.add(new Geofence.Builder()
        .setRequestId(entry.getName())
        .setCircularRegion(
                entry.getLat(),
                entry.getLng(),
                (float) entry.getRadius()
        )
        .setExpirationDuration(5000)
        .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER | Geofence.GEOFENCE_TRANSITION_EXIT).build());

}

此过程完成后，我调用geofenceClient.addGeofences（），

geofencingClient.addGeofences(getGeofencingRequest(), getGeofencePendingIntent()) {...}

但这给我一个错误，因为每当我调用getGeofencingRequest（）时：

private GeofencingRequest getGeofencingRequest() {
    GeofencingRequest.Builder builder = new GeofencingRequest.Builder();
    builder.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER);
    builder.addGeofences(geofenceList);
    return builder.build();}

任何帮助将不胜感激！非常感谢您拯救我的生命：'）

地理围栏列表未附加

0 个答案: