百度地圖BaiduMapsApiASDemo定位功能

百度地圖定位功能

• 實現SensorEventListener接口
• 重寫onSensorChanged方法

    @Override
    public void onSensorChanged(SensorEvent sensorEvent) {
        double x = sensorEvent.values[SensorManager.DATA_X];
        if (Math.abs(x - lastX) > 1.0) {
            mCurrentDirection = (int) x;
            locData = new MyLocationData.Builder()
                    .accuracy(mCurrentAccracy)
                    // 此處設置開發者獲取到的方向信息，順時針0-360
                    .direction(mCurrentDirection).latitude(mCurrentLat)
                    .longitude(mCurrentLon).build();
            mBaiduMap.setMyLocationData(locData);
        }
        lastX = x;

    }
    @Override
    public void onAccuracyChanged(Sensor sensor, int i) {

    }

• 定位SDK監聽函數

    public class MyLocationListenner implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            // map view 銷燬後不在處理新接收的位置
            if (location == null || mMapView == null) {
                return;
            }
            mCurrentLat = location.getLatitude();
            mCurrentLon = location.getLongitude();
            mCurrentAccracy = location.getRadius();
            locData = new MyLocationData.Builder()
                    .accuracy(location.getRadius())
                    // 此處設置開發者獲取到的方向信息，順時針0-360
                    .direction(mCurrentDirection).latitude(location.getLatitude())
                    .longitude(location.getLongitude()).build();
            mBaiduMap.setMyLocationData(locData);
            if (isFirstLoc) {
                isFirstLoc = false;
                LatLng ll = new LatLng(location.getLatitude(),
                        location.getLongitude());
                MapStatus.Builder builder = new MapStatus.Builder();
                builder.target(ll).zoom(18.0f);
                mBaiduMap.animateMapStatus(MapStatusUpdateFactory.newMapStatus(builder.build()));
            }
        }

        public void onReceivePoi(BDLocation poiLocation) {
        }
    }

* 注意問題

** onCreate 獲取傳感器管理服務

    SensorManager mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE)

** onResume 爲系統的方向傳感器註冊監聽器

    mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),
                SensorManager.SENSOR_DELAY_UI);

** onStop 取消註冊傳感器監聽
mSensorManager.unregisterListener(this);