Question

我正在尝试使用mapbox制作一个android应用程序，系统会在其中跟踪用户的当前位置。当应用程序启动时，它将使用当前的gps坐标正确居中。当我尝试使用android模拟器更改当前gps时，蓝点会更改，但是地图不会在更改后的位置居中...我该怎么办？这是我的代码！

public class MainActivity extends AppCompatActivity implements
            OnMapReadyCallback, PermissionsListener {
    private PermissionsManager permissionsManager;
    private MapboxMap mapboxMap;
    private MapView mapView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Mapbox access token is configured here. This needs to be called either in your application
    // object or in the same activity which contains the mapview.
    Mapbox.getInstance(this, getString(R.string.access_token));

    // This contains the MapView in XML and needs to be called after the access token is configured.
    setContentView(R.layout.activity_main);

    mapView = findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(this);
}

@Override
public void onMapReady(MapboxMap mapboxMap) {
    MainActivity.this.mapboxMap = mapboxMap;
    enableLocationComponent();
}

// @SuppressLint("WrongConstant")
    @SuppressWarnings( {"MissingPermission"})
private void enableLocationComponent() {
    // Check if permissions are enabled and if not request
    if (PermissionsManager.areLocationPermissionsGranted(this)) {

        // Get an instance of the component
        LocationComponent locationComponent = mapboxMap.getLocationComponent();

        // Activate
        locationComponent.activateLocationComponent(this);

        // Enable to make component visible
        locationComponent.setLocationComponentEnabled(true);

        // Set the component's camera mode
        locationComponent.setCameraMode(CameraMode.TRACKING_GPS);

        // Set the component's render mode
        locationComponent.setRenderMode(RenderMode.COMPASS);
    } else {
        permissionsManager = new PermissionsManager(this);
        permissionsManager.requestLocationPermissions(this);
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

@Override
public void onExplanationNeeded(List<String> permissionsToExplain) {
    Toast.makeText(this, "This app needs location permissions in order to show its functionality", Toast.LENGTH_LONG).show();
}

@Override
public void onPermissionResult(boolean granted) {
    if (granted) {
        enableLocationComponent();
    } else {
        Toast.makeText(this, "You didn't grant location permissions.", Toast.LENGTH_LONG).show();
        finish();
    }
}

@Override
@SuppressWarnings( {"MissingPermission"})
protected void onStart() {
    super.onStart();
    mapView.onStart();
}

@Override
protected void onResume() {
    super.onResume();
    mapView.onResume();
}

@Override
protected void onPause() {
    super.onPause();
    mapView.onPause();
}

@Override
protected void onStop() {
    super.onStop();
    mapView.onStop();
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    mapView.onSaveInstanceState(outState);
}

@Override
protected void onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
}

@Override
public void onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory();
}
}

Answer 1

我从没用过mapBox，我是一个libgdx家伙。

尽管如此，我认为您应该提供一个侦听器，该侦听器将侦听GEOLOCATION的变化并将相机居中放置在点上。

不知道mapbox中的任何编码，但看起来可能像这样：

if(GEOLOCATION_CHANGE > someValue){
camera.setPosition(x,y);    or   map.setPosition(x,y);   //can change cam or map pos
or  camera.setPosition(blueDot.getX(),blueDot.gety());}

Answer 2

我建议您在物理设备上构建您的应用，以查看其收到位置更新后的行为是否相同。您的代码似乎是正确的，但是当您将位置服务构建到Android Studio的模拟器时，位置服务有时可能会显得有些挑剔。

为什么我的应用程序地图不以GPS坐标为中心？

2 个答案: