android高德地图定位

                                                                                              android高德地图定位

今天刚学的高德地图定位，本篇博客在上一篇高德地图基础上加的定位，分享给大家！

直接上代码：

//终于找到报错“10: 定位服务启动失败”的问题 //这个MapActivity放置的位置有关系，当Activity放在TabSpec中就有问题 //如果单独作为一个activity则没有问题
代码： public class SecondActivity extends AppCompatActivity implements LocationSource,
        AMapLocationListener {
     private MapView mapView;
    private AMap map;

    //定位功能
    private OnLocationChangedListener mListener;
    private AMapLocationClient mlocationClient;
    private AMapLocationClientOption mLocationOption;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        mapView = (MapView) findViewById(R.id.map);//找到地图控件
//在activity执行onCreate时执行mMapView.onCreate(savedInstanceState)，创建地图
        mapView.onCreate(savedInstanceState);
       // AMap aMap = mapView.getMap();//初始化地图控制器对象\
        map = mapView.getMap();


        //修改地图的中心点位置
        CameraPosition cp = map.getCameraPosition();
        CameraPosition cpNew = CameraPosition.fromLatLngZoom(new LatLng(31.22, 121.48), cp.zoom);
        CameraUpdate cu = CameraUpdateFactory.newCameraPosition(cpNew);
        map.moveCamera(cu);

        //初始化定位服务
        initLocationService();



    }
    //初始化定位服务,这个地方有错误，这个地方map已经初始化
    //因此定位的初始化代码就进不去了。
    private void initLocationService() {
        if (map != null) {
            MyLocationStyle locationStyle = new MyLocationStyle();
            locationStyle.myLocationIcon(BitmapDescriptorFactory.fromResource(R.drawable.a_a));
            locationStyle.strokeColor(Color.BLACK);
            locationStyle.radiusFillColor(Color.argb(100, 0, 0, 180));
            locationStyle.strokeWidth(1.0f);
            map.setMyLocationStyle(locationStyle);
            map.setLocationSource(this);
            map.getUiSettings().setMyLocationButtonEnabled(true);
            map.setMyLocationEnabled(true);
        }
    }

    /**
     * 方法必须重写
     */
    @Override
    protected void onResume() {
        super.onResume();
        mapView.onResume();
    }

    /**
     * 方法必须重写
     */
    @Override
    protected void onPause() {
        super.onPause();
        mapView.onPause();
    }


    /**
     * 方法必须重写
     */
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mapView.onSaveInstanceState(outState);
    }

    /**
     * 方法必须重写
     */
    @Override
    protected void onDestroy() {
        super.onDestroy();
        mapView.onDestroy();
    }

    @Override
    public void onLocationChanged(AMapLocation amaplocation) {
        // TODO Auto-generated method stub
        if (amaplocation != null && mListener != null) {
            if (amaplocation != null && amaplocation.getErrorCode() == 0) {
                mListener.onLocationChanged(amaplocation);
            }
            else {
                String errText = "failed to locate," + amaplocation.getErrorCode()+ ": "
                        + amaplocation.getErrorInfo();
                Log.e("error",errText);
            }

        }
    }

    @Override
    public void activate(OnLocationChangedListener listener) {
        // TODO Auto-generated method stub
        mListener = listener;
        if (mlocationClient == null) {
            mlocationClient = new AMapLocationClient(getApplicationContext());
            mLocationOption = new AMapLocationClientOption();
            mlocationClient.setLocationListener(this);
            mLocationOption.setLocationMode(AMapLocationClientOption.AMapLocationMode.Hight_Accuracy);
            mlocationClient.setLocationOption(mLocationOption);
            mlocationClient.startLocation();
        }
    }

    @Override
    public void deactivate() {
        // TODO Auto-generated method stub
        mListener = null;
        if (mlocationClient != null) {
            mlocationClient.stopLocation();
            mlocationClient.onDestroy();
        }
        mlocationClient = null;
        mLocationOption = null;
    }
}