java - Google map v2 通过 Google Play 获取我的位置

Question

我想询问一下在使用 Google Maps API v2 期间发生的一个奇怪情况。 logcat 中出现错误:

The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.

我拥有的东西:

• Google map 与标记一起完美显示 - 我已从 Google 获取了相关代码。
• google-play-services.jar 库完美包含在 Eclipse 中 (项目->属性->android->添加...)。
• Eclipse 中的复选框(项目->属性->java 构建路径->订单构建路径)均已正确选中。
• 代码 GooglePlayServicesUtil.isGooglePlayServicesAvailable(context); 返回true。
• 此代码在设备 Nexus 4 上运行，而不是在模拟器上运行。

我正在尝试调用事件，这将允许我通过此类获取当前位置:

public class FindMyLocationManager implements LocationListener, LocationSource
{
    private OnLocationChangedListener mListener;
    private LocationManager locationManager;
    private GoogleMap map;
    private Context ctx;
    private int intervalTime;
    private int intervalDistance;


    public void setMap(GoogleMap map)
    {
        this.map = map;
    }


    public int getIntervalTime()
    {
        return intervalTime;
    }


    public void setIntervalTime(int intervalTime)
    {
        this.intervalTime = intervalTime;
    }


    public int getIntervalDistance()
    {
        return intervalDistance;
    }


    public void setIntervalDistance(int intervalDistance)
    {
        this.intervalDistance = intervalDistance;
    }


    public FindMyLocationManager(Context mContext)
    {
        this.ctx = mContext;
        locationManager = (LocationManager)mContext.getSystemService(Context.LOCATION_SERVICE);
    }


    @Override
    public void activate(OnLocationChangedListener listener)
    {
        mListener = listener;
        isGooglePlayOk(); //returns true
        if(isGPSAvailable())
        {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, intervalTime, intervalDistance, this);
        }
        else if(isCompassAvailable())
        {
            Log.d("DEBUG", "No GPS here");
        }
        else
        {
            Log.d("DEBUG", "Nothing here");
        }
    }


    private boolean isGPSAvailable()
    {

        return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
    }


    public boolean isGooglePlayOk()
    {
        int isAvailable = GooglePlayServicesUtil.isGooglePlayServicesAvailable(ctx);

        if(isAvailable == ConnectionResult.SUCCESS)
        {
            Toast.makeText(ctx, "Can connect to Goolge Play", Toast.LENGTH_SHORT).show();

            return true;
        }
        else if(GooglePlayServicesUtil.isUserRecoverableError(isAvailable))
        {
            Dialog dialog = GooglePlayServicesUtil.getErrorDialog(isAvailable, (Activity)ctx, 9001);
            dialog.show();

        }
        else
        {
            Toast.makeText(ctx, "Can't connect to Goolge Play", Toast.LENGTH_SHORT).show();
        }
        return false;
    }


    private boolean isCompassAvailable()
    {
        PackageManager pm =
                ctx.getPackageManager();

        return pm.hasSystemFeature(PackageManager.FEATURE_SENSOR_COMPASS);
    }


    @Override
    public void deactivate()
    {
        locationManager.removeUpdates((android.location.LocationListener)this);
        mListener = null;
    }


    public void restart()
    {
        locationManager.removeUpdates((android.location.LocationListener)this);
        if(isGPSAvailable())
        {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, intervalTime, intervalDistance, this);
        }
        else if(isCompassAvailable())
        {
            Log.d("DEBUG", "No GPS");
        }
        else
        {
            Log.d("DEBUG", "Nothing at all");
        }
    }

    // the compiler never enters here
    @Override
    public void onLocationChanged(Location location)
    {
        Toast.makeText(this.ctx, location.getLatitude() + " " + location.getLongitude(), Toast.LENGTH_LONG).show();
        if(mListener != null)
        {
            mListener.onLocationChanged(location);
        }

        map.animateCamera(CameraUpdateFactory.newLatLng(new LatLng(location.getLatitude(), location.getLongitude())));
    }


    @Override
    public void onProviderDisabled(String arg0)
    {
        // TODO Auto-generated method stub

    }


    @Override
    public void onProviderEnabled(String arg0)
    {
        // TODO Auto-generated method stub

    }


    @Override
    public void onStatusChanged(String arg0, int arg1, Bundle arg2)
    {
        // TODO Auto-generated method stub

    }
}

这是上面代码的用法:

// this method is called in many places in the program, like onCreate of my view with map or onResume
    private void setUpMapIfNeeded()
        {
            if(map == null)
            {
                map = ((SupportMapFragment)getFragmentManager().findFragmentById(R.id.map)).getMap();
                if(map != null)
                {
                    map.setMyLocationEnabled(true);
                    locationManager.setMap(map);
                    locationManager.setIntervalDistance(0);
                    locationManager.setIntervalTime(0);
                    map.setLocationSource(locationManager); //Here I apply the object from above class
                    //if(currentModel != null)
                    //currentModel = getCurrentModel(); TODO
                    //moveCameraInstantly(map.);
                    focusCamera();
                    fillMapWithMarkers(FindMyApplication.MAP_MARKER_MODELS);
                }
            }
    }

<小时/>

更新

看来错误本身是无害的，但我仍然没有收到 onLocationChanged 事件。

<小时/>

更新2

此代码基于 How to get My Location changed event with Google Maps android API v2? .

Answer 1

如果我理解正确的话，您已经定义了位置更新方法，但尚未开始请求位置更新。

要发送位置更新请求，请在 onCreate() 中创建位置客户端和请求:

protected void onCreate(Bundle savedInstanceState) {
  ...
  mLocationClient = new LocationClient(this, this, this);
  mLocationRequest = LocationRequest.create();
}

然后在onStart()中连接它:

protected void onStart() {
    ...
    mLocationClient.connect();
}

然后在onConnected()中发出更新请求:

public void onConnected(Bundle dataBundle) {
    ...
    mLocationClient.requestLocationUpdates(mLocationRequest, this);
}

以下是有关如何正确执行此操作的完整指南: http://developer.android.com/training/location/receive-location-updates.html#StartUpdates

找不到 Google Play 服务资源。错误是库中的常见错误。