Android使用百度地图API实现GPS步行轨迹

水深无声 2022-04-23 11:54 273阅读 0赞

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

下面是效果：

[![QQ截图20121129135007][QQ_20121129135007]][QQ_20121129135007_QQ_20121129135007]

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。

[![QQ截图20121129135408][QQ_20121129135408]][QQ_20121129135408_QQ_20121129135408]

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。

[![QQ截图20121129135007][QQ_20121129135007 1]][QQ_20121129135007_QQ_20121129135007 1]

再分享一下我老师大神的人工智能教程吧。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！[https://blog.csdn.net/jiangjunshow][https_blog.csdn.net_jiangjunshow]

[http_developer.baidu.com_map_sdkandev-download.htm]: http://developer.baidu.com/map/sdkandev-download.htm
[QQ_20121129135007]: http://images.cnblogs.com/cnblogs_com/kagami/201211/201211291415578511.png
[QQ_20121129135007_QQ_20121129135007]: /images/20220319/b3bf7e5b37ed443d9d487c7f7a6b7aae.png
[QQ_20121129135408]: http://images.cnblogs.com/cnblogs_com/kagami/201211/201211291415584150.png
[QQ_20121129135408_QQ_20121129135408]: /images/20220319/c8610946f68149fb90055ba162640900.png
[QQ_20121129135007 1]: http://images.cnblogs.com/cnblogs_com/kagami/201211/201211291416043764.png
[QQ_20121129135007_QQ_20121129135007 1]: /images/20220319/d5c1f38c141f40b99b4534e06fcb28d1.png
[https_blog.csdn.net_jiangjunshow]: https://blog.csdn.net/jiangjunshow/article/details/77338485