项目要实现跳入第三方APP实现导航功能，在APP内已经嵌入高德地图SDK,可以获取定位的经度。

坐标系的转换

要跳转到不同的地图，先要保证使用同一个坐标系统，不然会出现较大的偏移，地图APP坐标系统情况如下

坐标体系说明，及转换可参考：http://blog.csdn.net/a13570320979/article/details/51366355

使用如下工具类，就可以进行坐标系的转换

public class GPSUtil {
    public static double pi = 3.1415926535897932384626;
    public static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
    public static double a = 6378245.0;
    public static double ee = 0.00669342162296594323;

    public static double transformLat(double x, double y) {
        double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
                + 0.2 * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    public static double transformLon(double x, double y) {
        double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
                * Math.sqrt(Math.abs(x));
        ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
                * pi)) * 2.0 / 3.0;
        return ret;
    }
    public static double[] transform(double lat, double lon) {
        if (outOfChina(lat, lon)) {
            return new double[]{lat,lon};
        }
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        return new double[]{mgLat,mgLon};
    }
    public static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347)
            return true;
        if (lat < 0.8293 || lat > 55.8271)
            return true;
        return false;
    }
    /**
     * 84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System
     *
     * @param lat
     * @param lon
     * @return
     */
    public static double[] gps84_To_Gcj02(double lat, double lon) {
        if (outOfChina(lat, lon)) {
            return new double[]{lat,lon};
        }
        double dLat = transformLat(lon - 105.0, lat - 35.0);
        double dLon = transformLon(lon - 105.0, lat - 35.0);
        double radLat = lat / 180.0 * pi;
        double magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        double mgLat = lat + dLat;
        double mgLon = lon + dLon;
        return new double[]{mgLat, mgLon};
    }

    /**
     * * 火星坐标系 (GCJ-02) to 84 * * @param lon * @param lat * @return
     * */
    public static double[] gcj02_To_Gps84(double lat, double lon) {
        double[] gps = transform(lat, lon);
        double lontitude = lon * 2 - gps[1];
        double latitude = lat * 2 - gps[0];
        return new double[]{latitude, lontitude};
    }
    /**
     * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 将 GCJ-02 坐标转换成 BD-09 坐标
     *
     * @param lat
     * @param lon
     */
    public static double[] gcj02_To_Bd09(double lat, double lon) {
        double x = lon, y = lat;
        double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
        double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
        double tempLon = z * Math.cos(theta) + 0.0065;
        double tempLat = z * Math.sin(theta) + 0.006;
        double[] gps = {tempLat,tempLon};
        return gps;
    }

    /**
     * * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 * * 将 BD-09 坐标转换成GCJ-02 坐标 * * @param
     * bd_lat * @param bd_lon * @return
     */
    public static double[] bd09_To_Gcj02(double lat, double lon) {
        double x = lon - 0.0065, y = lat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
        double tempLon = z * Math.cos(theta);
        double tempLat = z * Math.sin(theta);
        double[] gps = {tempLat,tempLon};
        return gps;
    }

    /**将gps84转为bd09
     * @param lat
     * @param lon
     * @return
     */
    public static double[] gps84_To_bd09(double lat,double lon){
        double[] gcj02 = gps84_To_Gcj02(lat,lon);
        double[] bd09 = gcj02_To_Bd09(gcj02[0],gcj02[1]);
        return bd09;
    }
    public static double[] bd09_To_gps84(double lat,double lon){
        double[] gcj02 = bd09_To_Gcj02(lat, lon);
        double[] gps84 = gcj02_To_Gps84(gcj02[0], gcj02[1]);
        //保留小数点后六位
        gps84[0] = retain6(gps84[0]);
        gps84[1] = retain6(gps84[1]);
        return gps84;
    }

    /**保留小数点后六位
     * @param num
     * @return
     */
    private static double retain6(double num){
        String result = String .format("%.6f", num);
        return Double.valueOf(result);
    }
}

跳转实现

跳转工具类

public class MapUtil {
   
    public final static String BAIDU_PKG = "com.baidu.BaiduMap"; //百度地图的包名

    public final static String GAODE_PKG = "com.autonavi.minimap";//高德地图的包名

    public static void openGaoDe(Context context, double latitude, double longitude) {
        Intent intent = new Intent("android.intent.action.VIEW", android.net.Uri.parse("androidamap://navi?sourceApplication=你的APP名称&lat=" + latitude + "&lon=" + longitude + "&dev=0"));
        intent.setPackage("com.autonavi.minimap");
        context.startActivity(intent);
    }

    public static void openBaidu(Context context, MarkerOptions markerOption) {
        Intent i1 = new Intent();
        double[] position = GPSUtil.gcj02_To_Bd09(markerOption.getPosition().latitude, markerOption.getPosition().longitude);
        i1.setData(Uri.parse("baidumap://map/geocoder?location=" + position[0] + "," + position[1]));
        context.startActivity(i1);
    }

    /**
     * 检测地图应用是否安装
     *
     * @param context
     * @param packagename
     * @return
     */
    public static boolean checkMapAppsIsExist(Context context, String packagename) {
        PackageInfo packageInfo;
        try {
            packageInfo = context.getPackageManager().getPackageInfo(packagename, 0);
        } catch (Exception e) {
            packageInfo = null;
            e.printStackTrace();
        }
        if (packageInfo == null) {
            return false;
        } else {
            return true;
        }
    }
}

完整代码

public class MapActivity extends NewBaseActivity {

    public static Intent getIntent(Context context) {
        Intent intent = new Intent(context, MapActivity.class);
        return intent;
    }
    private AMap aMap;
    private Marker marker;
    private MarkerOptions markerOption;
    private MapView mMapView;
    private LatLng mLatLng = new LatLng(23.111074,114.414759);

    @Override
    protected int getLayoutId() {
        return R.layout.activity_map;
    }

    @Override
    protected void initViews(Bundle savedInstanceState) {
        //获取地图控件引用
        mMapView = (MapView) findViewById(R.id.map);
        //在activity执行onCreate时执行mMapView.onCreate(savedInstanceState)，创建地图
        mMapView.onCreate(savedInstanceState);
        aMap = mMapView.getMap();

        changeCamera(
                CameraUpdateFactory.newCameraPosition(new CameraPosition(
                        mLatLng, 18, 30, 30)));
        addMarkToMap();
    }

    private void addMarkToMap() {
        markerOption = new MarkerOptions().icon(BitmapDescriptorFactory
                .defaultMarker(BitmapDescriptorFactory.HUE_AZURE))
                .position(mLatLng)
                .snippet("lala")
                .draggable(false);
        marker = aMap.addMarker(markerOption);
        marker.showInfoWindow();
        aMap.setOnMarkerClickListener(new AMap.OnMarkerClickListener() {
            @Override
            public boolean onMarkerClick(Marker marker) {
                if (MapUtil.checkMapAppsIsExist(MapActivity.this,MapUtil.GAODE_PKG)){
                    DialogUtil.showConfirmationDialog(MapActivity.this, "打开地图", "是否打开高德地图进行导航？", new DialogUtil.OnConfirmCallback() {
                        @Override
                        public void onConfirm() {
                            MapUtil.openGaoDe(MapActivity.this ,markerOption);
                        }

                        @Override
                        public void onCancel(DialogInterface dialog) {

                        }
                    });
                }else if (MapUtil.checkMapAppsIsExist(MapActivity.this , MapUtil.BAIDU_PKG)) {
                    DialogUtil.showConfirmationDialog(MapActivity.this, "打开地图", "是否打开百度地图进行导航？", new DialogUtil.OnConfirmCallback() {
                        @Override
                        public void onConfirm() {
                            MapUtil.openBaidu(MapActivity.this ,markerOption);
                        }

                        @Override
                        public void onCancel(DialogInterface dialog) {

                        }
                    });
                }else {
                    ToastUtil.showShort("请安装地图");
                }
                return false;
            }
        });
    }

    /**
     * 根据动画按钮状态，调用函数animateCamera或moveCamera来改变可视区域
     */
    private void changeCamera(CameraUpdate update) {
        aMap.moveCamera(update);
    }

    @Override
    protected void initData() {

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        //在activity执行onDestroy时执行mMapView.onDestroy()，销毁地图
        mMapView.onDestroy();
    }

    @Override
    protected void onResume() {
        super.onResume();
        //在activity执行onResume时执行mMapView.onResume ()，重新绘制加载地图
        mMapView.onResume();
    }
    @Override
    protected void onPause() {
        super.onPause();
        //在activity执行onPause时执行mMapView.onPause ()，暂停地图的绘制
        mMapView.onPause();
    }
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        //在activity执行onSaveInstanceState时执行mMapView.onSaveInstanceState (outState)，保存地图当前的状态
        mMapView.onSaveInstanceState(outState);
    }
}

参考文章：
http://blog.csdn.net/meegomeego/article/details/39927017
http://www.jianshu.com/p/ea092e243aaa
http://blog.csdn.net/a13570320979/article/details/51366355