基于百度地图api的移动路径绘制以及距离计算

以下代码能够在地图上绘制自己走过的路径，有一个计时器，一个路程显示。按下“开始跑步”就可以开始绘制轨迹并同时开始计时。

以下是MainActivity文件

public class MainActivity extends Activity {
    // int count=-0;
    MapView mMapView = null;
    LocationClient mLocClient;
    public MyLocationListenner myListener = new MyLocationListenner();
    private LocationMode mCurrentMode;
    BitmapDescriptor mCurrentMarker;
    // double distance=0;

    BaiduMap mBaiduMap;
    private Timer timer = new Timer();
    private TimerTask task;
    // List points = new ArrayList();
    List pointstwo = new ArrayList();
    LatLng p1;
    LatLng p2;
    // UI相关
    OnCheckedChangeListener radioButtonListener;
    Button requestLocButton, startButton,stopButton;
    private TextView tvDistance;
    boolean isFirstLoc = true;// 是否首次定位

    private Handler handler = new Handler() {

        public void handleMessage(Message msg) {
            // 调用相机回调接口由于MainActivity已经实现了回调接口，所以MainActivity.this即可

            if (msg.what == 1) {
                // if(points.size()>3){
                // pointstwo.add((LatLng)points.get(points.size()-3));
                // pointstwo.add((LatLng)points.get(points.size()-2));
                // pointstwo.add((LatLng)points.get(points.size()-1));
                // }else{
                // pointstwo.add((LatLng)points.get(count));
                // }
                // Log.d("points",""+points.get(points.size()-3).latitude);
                // Log.d("points",""+points.get(points.size()-2).latitude);
                // Log.d("points",""+points.get(points.size()-1).latitude);
                pointstwo.add(p1);
                pointstwo.add(p2);
                // distance+=DistanceUtil. getDistance(p1, p2);
                // LatLng llDot = new LatLng(p2.latitude,p2.longitude);
                // try{
                OverlayOptions ooDot = new DotOptions().center(p2).radius(6)
                        .color(0xAAFF0000);
                mBaiduMap.addOverlay(ooDot);

                OverlayOptions ooPolyline = new PolylineOptions().width(4)
                        .color(0xAAFF0000).points(pointstwo);
                mBaiduMap.addOverlay(ooPolyline);
                p1 = p2;
                mLocClient.requestLocation();
                // }catch(Exception e){
                // e.printStackTrace();
                // }

            }
        }

    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // 使屏幕不显示标题栏(必须要在setContentView方法执行前执行)
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        // 隐藏状态栏，使内容全屏显示(必须要在setContentView方法执行前执行)
        this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
        // 在使用SDK各组件之前初始化context信息，传入ApplicationContext
        // 注意该方法要再setContentView方法之前实现
        SDKInitializer.initialize(getApplicationContext());
        /*
         * forbid lock screen
         */
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,
                WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.activity_main);

        // 获取地图控件引用
        Log.d("points", "wwww");

        requestLocButton = (Button) findViewById(R.id.button1);
        mCurrentMode = LocationMode.NORMAL;
        requestLocButton.setText("普通");
        OnClickListener btnClickListener = new OnClickListener() {
            public void onClick(View v) {
                switch (mCurrentMode) {
                case NORMAL:
                    requestLocButton.setText("跟随");
                    mCurrentMode = LocationMode.FOLLOWING;
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, mCurrentMarker));
                    break;
                case COMPASS:
                    requestLocButton.setText("普通");
                    mCurrentMode = LocationMode.NORMAL;
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, mCurrentMarker));
                    break;
                case FOLLOWING:
                    requestLocButton.setText("罗盘");
                    mCurrentMode = LocationMode.COMPASS;

                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, mCurrentMarker));
                    break;
                }
            }
        };
        requestLocButton.setOnClickListener(btnClickListener);

        RadioGroup group = (RadioGroup) this.findViewById(R.id.radioGroup);
        radioButtonListener = new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if (checkedId == R.id.defaulticon) {
                    // 传入null则，恢复默认图标
                    mCurrentMarker = null;
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, null));
                }
                if (checkedId == R.id.customicon) {
                    // 修改为自定义marker
                    mCurrentMarker = BitmapDescriptorFactory
                            .fromResource(R.drawable.icon_geo);
                    mBaiduMap
                            .setMyLocationConfigeration(new MyLocationConfiguration(
                                    mCurrentMode, true, mCurrentMarker));
                }
            }
        };
        group.setOnCheckedChangeListener(radioButtonListener);

        // 地图初始化
        mMapView = (MapView) findViewById(R.id.bmapView);
        mBaiduMap = mMapView.getMap();
        // 开启定位图层
        mBaiduMap.setMyLocationEnabled(true);

        // 开启交通图
        mBaiduMap.setTrafficEnabled(true);
        mBaiduMap.setMapStatus(MapStatusUpdateFactory
                .newMapStatus(new MapStatus.Builder().zoom(17).build()));// 设置缩放级别
        // 定位初始化
        mLocClient = new LocationClient(this);
        mLocClient.registerLocationListener(myListener);

        startButton = (Button) findViewById(R.id.button_start);
        startButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                startTimer();

                LocationClientOption option = new LocationClientOption();
                option.setOpenGps(true);// 打开gps
                option.setIsNeedAddress(true);
                option.setCoorType("bd09ll"); // 设置坐标类型
                option.setScanSpan(1000); //请求获取gps的时间间隔为1s
                mLocClient.setLocOption(option);
                mLocClient.start();
                init();

                Button btnstarttimer = (Button)findViewById(R.id.btnSWStart);
                btnstarttimer.performClick();

                //sum_distance = 0;

            }
        });

        stopButton = (Button) findViewById(R.id.button_end);
        stopButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                pauseTimer();
                mLocClient.stop();

                Button btnstoptimmer = (Button)findViewById(R.id.btnSWPause);
                btnstoptimmer.performClick();

            }
        });


    }

    /**
     * 定位SDK监听函数
     */
    public class MyLocationListenner implements BDLocationListener {

        @Override
        public void onReceiveLocation(BDLocation location) {
            // map view 销毁后不在处理新接收的位置
            if (location == null || mMapView == null)
                return;
            MyLocationData locData = new MyLocationData.Builder()
                    .accuracy(location.getRadius())
                    // 此处设置开发者获取到的方向信息，顺时针0-360
                    .direction(100).latitude(location.getLatitude())
                    .longitude(location.getLongitude()).build();
            mBaiduMap.setMyLocationData(locData);
            if (isFirstLoc) {
                isFirstLoc = false;
                // p1=new LatLng(39.93923, 116.357428);
                p1 = p2 = new LatLng(location.getLatitude(),
                        location.getLongitude());
                MapStatusUpdate u = MapStatusUpdateFactory.newLatLng(p2);
                // count++;
                // points.add(p2);
                // pointstwo.add(ll);
                mBaiduMap.animateMapStatus(u);
            } else {
                // count++;
                LatLng p0 = p2;
                p2 = new LatLng(location.getLatitude(), location.getLongitude());
                sum_distance = sum_distance + gps2m(p0.latitude,p0.longitude,p2.latitude,p2.longitude);
                MapStatusUpdate u = MapStatusUpdateFactory.newLatLng(p2);
                // points.add(p2);
                Log.d("points", "wwww");
                OverlayOptions ooDot = new DotOptions().center(p2).radius(6)
                        .color(0xAAFF0000);
                mBaiduMap.addOverlay(ooDot);

                mBaiduMap.animateMapStatus(u);

            }

            tvDistance = (TextView)findViewById(R.id.distance);
            //tvDistance.setText("现在走过的距离是："+sum_distance+"米");
            tvDistance.setText(""+sum_distance+"米");
        }

        public void onReceivePoi(BDLocation poiLocation) {
        }
    }

    @Override
    protected void onPause() {
        mMapView.onPause();
        super.onPause();
    }

    @Override
    protected void onResume() {
        mMapView.onResume();
        super.onResume();
        //startTimer();
    }

    @Override
    protected void onDestroy() {
        // 退出时销毁定位
        mLocClient.stop();
        // 关闭定位图层
        mBaiduMap.setMyLocationEnabled(false);
        mMapView.onDestroy();
        mMapView = null;
        //pauseTimer();
        super.onDestroy();
    }

    public void startTimer() {
        if (timer == null) {
            timer = new Timer();
        }

        if (task == null) {
            task = new TimerTask() {
                @Override
                public void run() {
                    // TODO Auto-generated method stub

                    Message message = new Message();
                    message.what = 1;
                    handler.sendMessage(message);
                }
            };
        }

        if (timer != null && task != null) {
            try {
                //task.cancel();
                timer.schedule(task, 2000, 1000);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public void pauseTimer() {
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
        if (task != null) {
            task.cancel();
            task = null;
        }
    }

    void init() {
        Button bt = (Button) findViewById(R.id.cutpicture);
        bt.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        takeScreenShot(mMapView, "/mnt/sdcard/libichen/");
                    }
                }).start();
            }

        });
    }

    /**
     * 截屏方法
     * 
     * @param view
     * @param path
     * @param fileName
     */
    public static boolean takeScreenShot(View view, String path) {
        boolean isSucc = false;
        /**
         * 我们要获取它的cache先要通过setDrawingCacheEnable方法把cache开启，
         * 然后再调用getDrawingCache方法就可以获得view的cache图片了。
         * buildDrawingCache方法可以不用调用，因为调用getDrawingCache方法时，
         * 若果cache没有建立，系统会自动调用buildDrawingCache方法生成cache。 若果要更新cache,
         * 必须要调用destoryDrawingCache方法把旧的cache销毁， 才能建立新的。
         */
        view.setDrawingCacheEnabled(true);// 开启获取缓存
        view.buildDrawingCache();
        Bitmap bitmap = view.getDrawingCache();// 得到View的cache
        Canvas canvas = new Canvas(bitmap);
        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        Paint paint = new Paint();
        paint.setColor(Color.YELLOW);
        SimpleDateFormat simple = new SimpleDateFormat("yyyyMMddhhmmss");
        String time = simple.format(new Date());

        // canvas.drawText(time, w-w/2, h-h/10, paint);
        canvas.save();
        canvas.restore();
        FileOutputStream fos = null;
        try {
            File sddir = new File(path);
            if (!sddir.exists()) {
                sddir.mkdir();
            }
            // File file = new File("/mnt/sdcard/libichen.png");
            File file = new File(path + time + ".jpg");
            fos = new FileOutputStream(file);
            if (fos != null) {
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
                fos.close();
                isSucc = true;
            }
        } catch (Exception e) {

            e.printStackTrace();
        }
        return isSucc;

    }


    //-------------------------计算距离--------------------------

    private double sum_distance = 0;
    private final double EARTH_RADIUS = 6378137.0;

    private double gps2m(double lat_a, double lng_a, double lat_b, double lng_b) {
    double radLat1 = (lat_a * Math.PI / 180.0);
    double radLat2 = (lat_b * Math.PI / 180.0);
    double a = radLat1 - radLat2;
    double b = (lng_a - lng_b) * Math.PI / 180.0;
    double s = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
    + Math.cos(radLat1) * Math.cos(radLat2)
    * Math.pow(Math.sin(b / 2), 2)));
    s = s * EARTH_RADIUS;
    //s = Math.round(s * 10000) / 10000;
    return 1.38*s;

    }

}

以下是布局文件

"http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    id="@+id/bmapView"
        android:layout_width="fill_parent"
        android:layout_height="310dp"
        android:clickable="true" />

    id="@+id/linearLayout1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_marginTop="80dip"
        android:background="#D000"
        android:minWidth="100dip"
        android:orientation="vertical"
        android:padding="2dp" >

        id="@+id/radioGroup"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="定位icon" >

            id="@+id/defaulticon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:checked="true"
                android:text="默认图标" >
            

            id="@+id/customicon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="自定义图标" >
            
        
    

    id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="25dp"
        android:layout_marginTop="10dip" />

    id="@+id/cutpicture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/button1"
        android:layout_below="@+id/linearLayout1"
        android:layout_marginTop="64dp"
        android:text="cutpicture" />

    id="@+id/button_end"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/button_start"
        android:layout_toRightOf="@+id/button_start"
        android:text="停止跑步" />

    id="@+id/button_start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/bmapView"
        android:layout_alignParentBottom="true"
        android:text="开始跑步" />

    id="@+id/tabStopWatch"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical" 
                    android:layout_above="@+id/button_start"
                    android:layout_below = "@+id/bmapView">

                    "fill_parent"
                        android:layout_height="wrap_content"
                        android:orientation="horizontal" >

                        id="@+id/timeHour"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:textAppearance="?android:attr/textAppearanceLarge" 
                            android:textSize = "30dp"
                            android:textColor = "#5CACEE"/>

                        "wrap_content"
                            android:layout_height="wrap_content"
                            android:text=":"
                            android:textAppearance="?android:attr/textAppearanceLarge"
                            android:textSize = "30dp" />

                        id="@+id/timeMin"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:textAppearance="?android:attr/textAppearanceLarge"
                            android:textSize = "30dp" 
                            android:textColor = "#5CACEE"/>

                        "wrap_content"
                            android:layout_height="wrap_content"
                            android:text=":"
                            android:textAppearance="?android:attr/textAppearanceLarge"
                            android:textSize = "30dp" />

                        id="@+id/timeSec"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:textAppearance="?android:attr/textAppearanceLarge" 
                            android:textSize = "30dp"
                            android:textColor = "#5CACEE"/>

                        "wrap_content"
                            android:layout_height="wrap_content"
                            android:text="."
                            android:textAppearance="?android:attr/textAppearanceLarge" 
                            android:textSize = "30dp"/>

                        id="@+id/timeMSec"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:textAppearance="?android:attr/textAppearanceLarge" 
                            android:textSize = "30dp"
                            android:textColor = "#5CACEE"/>
                    


                    id = "@+id/score"
                        android:layout_width = "fill_parent"
                        android:layout_height = "wrap_content"
                        android:text="你的成绩："
                        android:textSize = "25dp"
                        android:textColor = "#32CD32"/>
                    "fill_parent"
                        android:layout_height="wrap_content"
                        android:orientation="horizontal" >

                        id="@+id/btnSWStart"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:text="开始" />

                        id="@+id/btnSWPause"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:text="停止" />

                        id="@+id/btnSWResume"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:text="继续" />



                        id="@+id/btnSWReset"
                            android:layout_width="0dp"
                            android:layout_height="wrap_content"
                            android:layout_weight="1"
                            android:text="重置" />

                    
                    id = "@+id/state" 
                        android:layout_width = "fill_parent"
                        android:layout_height = "wrap_content"
                        android:text ="现在的状态是：停止"
                        android:textSize = "20dp"/>
                    id = "@+id/distance" 
                        android:layout_width = "fill_parent"
                        android:layout_height = "wrap_content"
                        android:text ="现在走过的距离是：0米"
                        android:textSize = "20dp"/>"