Android使用百度地图API实现GPS步行轨迹

百度地图Android SDK下载：http://developer.baidu.com/map/sdkandev-download.htm

下面是效果：

采样点取得太频繁所以看起来像是一个个点。。。   可以自己设计算法只取有用的点。

 

为了方便，我直接修改百度提供的示例代码。

要修改的是BMapApiDemoApp.java,LocationOverlay.java还有自定义一个继承自Overlay的RunLineOverlay。

 

 

BMapApiDemoApp:

public class BMapApiDemoApp extends Application {

    

    static BMapApiDemoApp mDemoApp;

    

    //百度MapAPI的管理类

    BMapManager mBMapMan = null;

    

    // 授权Key

    // TODO: 请输入您的Key,

    // 申请地址：http://dev.baidu.com/wiki/static/imap/key/

    String mStrKey = "你的Key";

    boolean m_bKeyRight = true;    // 授权Key正确，验证通过

    

    // 常用事件监听，用来处理通常的网络错误，授权验证错误等

    static class MyGeneralListener implements MKGeneralListener {

        @Override

        public void onGetNetworkState(int iError) {

            Log.d("MyGeneralListener", "onGetNetworkState error is "+ iError);

            Toast.makeText(BMapApiDemoApp.mDemoApp.getApplicationContext(), "您的网络出错啦！",

                    Toast.LENGTH_LONG).show();

        }



        @Override

        public void onGetPermissionState(int iError) {

            Log.d("MyGeneralListener", "onGetPermissionState error is "+ iError);

            if (iError ==  MKEvent.ERROR_PERMISSION_DENIED) {

                // 授权Key错误：

                Toast.makeText(BMapApiDemoApp.mDemoApp.getApplicationContext(), 

                        "请在BMapApiDemoApp.java文件输入正确的授权Key！",

                        Toast.LENGTH_LONG).show();

                BMapApiDemoApp.mDemoApp.m_bKeyRight = false;

            }

        }

    }



    @Override

    public void onCreate() {

        Log.v("BMapApiDemoApp", "onCreate");

        mDemoApp = this;

        mBMapMan = new BMapManager(this);

        boolean isSuccess = mBMapMan.init(this.mStrKey, new MyGeneralListener());

        // 初始化地图sdk成功，设置定位监听时间

        if (isSuccess) {

             mBMapMan.getLocationManager().enableProvider(MKLocationManager.MK_GPS_PROVIDER);

            mBMapMan.getLocationManager().setNotifyInternal(10, 5);

        }

        else {

            // 地图sdk初始化失败，不能使用sdk

        }

        

        super.onCreate();

    }



    @Override

    //建议在您app的退出之前调用mapadpi的destroy()函数，避免重复初始化带来的时间消耗

    public void onTerminate() {

        // TODO Auto-generated method stub

        if (mBMapMan != null) {

            mBMapMan.destroy();

            mBMapMan = null;

        }

        super.onTerminate();

    }



}

mStrKey的值是你申请来的Key，申请地址上面有。

onCreate里加了句mBMapMan.getLocationManager().enableProvider(MKLocationManager.MK_GPS_PROVIDER);用来打开GPS位置。

 

 

RunLineOverlay：

public class RunLineOverlay extends Overlay {

    

    private List<GeoPoint> mList;

    

    public RunLineOverlay() {

        // TODO Auto-generated constructor stub

        super();

        mList=new ArrayList<GeoPoint>();

    }

    

    @Override

    public void draw(Canvas arg0, MapView arg1, boolean arg2) {

        // TODO Auto-generated method stub

        super.draw(arg0, arg1, arg2);

        Projection projection = arg1.getProjection();        

        Paint paint=new Paint();

        paint.setColor(Color.BLACK);

        paint.setStyle(Paint.Style.STROKE);

        paint.setStrokeWidth(5.0f);

        

        

        Point p1=projection.toPixels(mList.get(0), null);

        Point p2=projection.toPixels(mList.get(0), null);

        for (GeoPoint item : mList) {

            p1.x=p2.x;

            p1.y=p2.y;

            p2=projection.toPixels(item, null);

            arg0.drawLine(p1.x, p1.y, p2.x, p2.y, paint);

        }

        

        

        

    }



    public List<GeoPoint> getmList() {

        return mList;

    }



    public void setmList(List<GeoPoint> mList) {

        this.mList = mList;

    }

    

    public void addGeoPoint(GeoPoint point){

        

            mList.add(point);

    }



}

这是一个自定义的用于在底图上根据点画出轨迹的覆盖物。Projection用于经纬度和屏幕像素点的转换。大概功能就是取出经纬度点然后转成屏幕像素点然后连成轨迹。

 

 

LocationOverlay：

public class LocationOverlay extends MapActivity {



    MapView mMapView = null;

    LocationListener mLocationListener = null;//onResume时注册此listener，onPause时需要Remove

    MyLocationOverlay mLocationOverlay = null;    //定位图层

    RunLineOverlay mRunLine=null;

    

    protected void onCreate(Bundle savedInstanceState) {

        

        super.onCreate(savedInstanceState);

        setContentView(R.layout.mapviewdemo);

        

        BMapApiDemoApp app = (BMapApiDemoApp)this.getApplication();

        if (app.mBMapMan == null) {

            app.mBMapMan = new BMapManager(getApplication());

            app.mBMapMan.init(app.mStrKey, new BMapApiDemoApp.MyGeneralListener());

        }

        app.mBMapMan.start();

        // 如果使用地图SDK，请初始化地图Activity

        super.initMapActivity(app.mBMapMan);

        

        mMapView = (MapView)findViewById(R.id.bmapView);

        mMapView.setBuiltInZoomControls(true);

        //设置在缩放动画过程中也显示overlay,默认为不绘制

        mMapView.setDrawOverlayWhenZooming(true);

        

        // 添加定位图层

        mLocationOverlay = new MyLocationOverlay(this, mMapView);

        mMapView.getOverlays().add(mLocationOverlay);

        

        // 注册定位事件

        mLocationListener = new LocationListener(){



            @Override

            public void onLocationChanged(Location location) {

                if (location != null){

                    GeoPoint pt = new GeoPoint((int)(location.getLatitude()*1e6),

                            (int)(location.getLongitude()*1e6));

                    if(mRunLine==null)

                    {mRunLine=new RunLineOverlay();

                    mRunLine.addGeoPoint(pt);

                    mMapView.getOverlays().add(mRunLine);}else

                        mRunLine.addGeoPoint(pt);

                    mMapView.getController().animateTo(pt);

                }

            }

        };

    }



    @Override

    protected void onPause() {

        BMapApiDemoApp app = (BMapApiDemoApp)this.getApplication();

        app.mBMapMan.getLocationManager().removeUpdates(mLocationListener);

        mLocationOverlay.disableMyLocation();

        mLocationOverlay.disableCompass(); // 关闭指南针

        app.mBMapMan.stop();

        super.onPause();

    }

    @Override

    protected void onResume() {

        BMapApiDemoApp app = (BMapApiDemoApp)this.getApplication();

        // 注册定位事件，定位后将地图移动到定位点

        app.mBMapMan.getLocationManager().requestLocationUpdates(mLocationListener);

        mLocationOverlay.enableMyLocation();

        mLocationOverlay.enableCompass(); // 打开指南针

        app.mBMapMan.start();

        super.onResume();

    }



    @Override

    protected boolean isRouteDisplayed() {

        // TODO Auto-generated method stub

        return false;

    }



}

主要修改的代码是

public void onLocationChanged(Location location) {
                if (location != null){
                    GeoPoint pt = new GeoPoint((int)(location.getLatitude()*1e6),
                            (int)(location.getLongitude()*1e6));
                    if(mRunLine==null)
                    {mRunLine=new RunLineOverlay();
                    mRunLine.addGeoPoint(pt);
                    mMapView.getOverlays().add(mRunLine);}else
                        mRunLine.addGeoPoint(pt);
                    mMapView.getController().animateTo(pt);
                }

 

当位置改变是这个方法会被调用。功能就是把新位置放入mRunLine。当然第一次要mMapView.getOverlays().add(mRunLine);把mRunLine放进mMapView的覆盖物列表，这样当mMapView被重绘时mRunLine的draw方法就会被调用。

 

改好后运行程序，列表点击Overlaytest，然后出去转一圈。