Android 百度地图 Marker 平滑移动

首先我们大家都知道百度地图中的Marker是基于经纬度也就是一个点来得到自身存在的位置的，但是我们如果想让Marker 移动呢？跳点我们大家都会，只需要重新为Marker赋值一个坐标点就好了，但是如果我们要平滑移动呢，我的做法就是为坐标点频繁赋值，使其看起来像是移动过去的，好了，废话不多说了，看效果吧

上面花了条线就是为了让我们看到Marker的移动轨迹，但是我们即使是频繁赋值也还是有问题的，我们还要考虑到箭头所指的方向，也就是根据起始点和目标点来计算角度

直接上代码吧：

package com.jlau.wjyuezhao.baidumapdemo;

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;

import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.BitmapDescriptorFactory;
import com.baidu.mapapi.map.MapStatus;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.Marker;
import com.baidu.mapapi.map.MarkerOptions;
import com.baidu.mapapi.map.OverlayOptions;
import com.baidu.mapapi.map.Polyline;
import com.baidu.mapapi.map.PolylineOptions;
import com.baidu.mapapi.model.LatLng;
import com.baidu.mapapi.utils.DistanceUtil;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * Created by Administrator on 2016/12/19.
 */

public class MarkMoveUtil {
    //起始经度
    private static double sl0 ;// = 125.30227000000002;
    //起始纬度
    private static double   slt;//= 43.88362;
    //结束点经度
    private static double   el0;//= 129.40227000000002;
    //结束点纬度
    private static double elt;// = 49.68362;
    //决定小数点后取几位的参数
    private static double param ;//= 1000;
    private BaiduMap mBaiduMap;
    private Polyline mPolyline;
    private Marker mMoveMarker;
    //移动处理的 Handler
    private Handler mHandler;
    private MapView mMapView;
    //把起始点和结束点等分成十份的点的容器
    private static List<LatLng> latlngs;
    //每移动一次的时间间隔(通过设置间隔时间和距离可以控制速度和图标移动的距离)
    private double time_interval = 8;
    private Context context;

    private final String ACTION_NAME = "发送广播";



    /**
     *
     * @param sl0
     * @param slt
     * @param param
     * @param mMapView
     */
    public MarkMoveUtil(double sl0,double slt,double param,MapView mMapView,Marker marker,Context context
    ){
        this.sl0 = sl0;
        this.slt = slt;
        this.param = param;
        this.mMapView = mMapView;
        this.mBaiduMap = mMapView.getMap();
        this.mMoveMarker = marker;
        this.context = context;
        mHandler = new Handler(Looper.getMainLooper());
        MapStatus.Builder builder = new MapStatus.Builder();
        builder.target(new LatLng(slt,sl0));
        builder.zoom(11.0f);
        mBaiduMap.setMapStatus(MapStatusUpdateFactory.newMapStatus(builder.build()));
    }


    /**
     * 获取等分的十个点的集合
     * @param sl0
     * @param slt
     * @param el0
     * @param elt
     */
    private static void getLatlngs(double sl0, double slt, double el0, double elt){
        Log.e("CCC",el0+":"+elt);
        double a = elt - slt;
        double b = el0 - sl0;
        double c = a/param;
        double d = b/param;
        latlngs = new ArrayList<>();
        for(int i = 0;i < param;i++){
            double lat = slt + c * i;
            double lon = sl0 + d * i;
            latlngs.add(new LatLng(lat,lon) );
        }
    }

    /**
     * 根据点画出线
     */
    public void drawPolyLine() {
        List<LatLng> polylines = new ArrayList<>();
        for (int index = 0; index < latlngs.size(); index++) {
            polylines.add(latlngs.get(index));
        }
        polylines.add(latlngs.get(0));
        PolylineOptions polylineOptions = new PolylineOptions().points(polylines).width(10).color(Color.RED);
        mPolyline = (Polyline) mBaiduMap.addOverlay(polylineOptions);
    }

    /**
     * 根据点获取图标转的角度
     */
    private double getAngle(int startIndex) {
        if ((startIndex + 1) >= mPolyline.getPoints().size()) {
            throw new RuntimeException("index out of bonds");
        }
        LatLng startPoint = mPolyline.getPoints().get(startIndex);
        LatLng endPoint = mPolyline.getPoints().get(startIndex + 1);
        return getAngle(startPoint, endPoint);
    }

    /**
     * 根据两点算取图标转的角度
     */
    private double getAngle(LatLng fromPoint, LatLng toPoint) {
        double slope = getSlope(fromPoint, toPoint);
        if (slope == Double.MAX_VALUE) {
            if (toPoint.latitude > fromPoint.latitude) {
                return 0;
            } else {
                return 180;
            }
        }
        float deltAngle = 0;
        if ((toPoint.latitude - fromPoint.latitude) * slope < 0) {
            deltAngle = 180;
        }
        double radio = Math.atan(slope);
        double angle = 180 * (radio / Math.PI) + deltAngle - 90;
        return angle;
    }

    /**
     * 根据点和斜率算取截距
     */
    private double getInterception(double slope, LatLng point) {

        double interception = point.latitude - slope * point.longitude;
        return interception;
    }

    /**
     * 算斜率
     */
    private double getSlope(LatLng fromPoint, LatLng toPoint) {
        if (toPoint.longitude == fromPoint.longitude) {
            return Double.MAX_VALUE;
        }
        double slope = ((toPoint.latitude - fromPoint.latitude) / (toPoint.longitude - fromPoint.longitude));
        return slope;
    }
    private double getDistance(){
        double distance = DistanceUtil.getDistance(latlngs.get(0), latlngs.get((int) param -1));
        double v =  distance /10000;
       double  theDistance = v * (time_interval/1000);
        return  theDistance;
    }

    /**
     * 循环进行移动逻辑
     */
    public void moveLooper() {
        new Thread() {

            public void run() {

//                while (true) {
              Log.e("TAG", "start time:"+getCurrentTime());
                    for (int i = 0; i < latlngs.size() - 1; i++) {
                        final LatLng startPoint = latlngs.get(i);
                        final LatLng endPoint = latlngs.get(i+1);
                        mMoveMarker
                                .setPosition(startPoint);

                        mHandler.post(new Runnable() {
                            @Override
                            public void run() {
                                // refresh marker's rotate
                                if (mMapView == null) {
                                    return;
                                }
                                mMoveMarker.setRotate((float) getAngle(startPoint,
                                        endPoint));
                            }
                        });
                        double slope = getSlope(startPoint, endPoint);
                        // 是不是正向的标示
                        boolean isReverse = (startPoint.latitude > endPoint.latitude);
                        double intercept = getInterception(slope, startPoint);
                        double xMoveDistance = isReverse ? getDistance() :
                                -1 * getDistance();
                        for (double j = startPoint.latitude; !((j > endPoint.latitude) ^ isReverse);
                             j = j - xMoveDistance) {
                            LatLng latLng = null;
                            if (slope == Double.MAX_VALUE) {
                                latLng = new LatLng(j, startPoint.longitude);
                            } else {
                                latLng = new LatLng(j, (j - intercept) / slope);
                            }
                            final LatLng finalLatLng = latLng;
                            mHandler.post(new Runnable() {
                                @Override
                                public void run() {
                                    if (mMapView == null) {
                                        return;
                                    }
                                    mMoveMarker.setPosition(finalLatLng);
                                }
                            });
                            try {
                                Thread.sleep((int)time_interval);
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                Log.e("TAG", "end time:"+getCurrentTime());
                    sl0 = el0;
                    slt = elt;
                    Intent mIntent = new Intent(ACTION_NAME);
                    mIntent.putExtra("yaner", "发送广播，相当于在这里传送数据");
                    //发送广播
                    context.sendBroadcast(mIntent);
//                }
            }
        }.start();
    }

    public static void start(LatLng latLng){
        el0 = latLng.longitude;
        elt =latLng.latitude;
        getLatlngs(sl0,slt,el0,elt);
    }
    private String getCurrentTime(){
        SimpleDateFormat formatter    =   new    SimpleDateFormat    ("yyyy年MM月dd日    HH:mm:ss     ");
        Date curDate =   new    Date(System.currentTimeMillis());//获取当前时间
        String    str    =    formatter.format(curDate);
        return str;
    }

//    private Marker createMarker(LatLng latLng){
//        OverlayOptions markerOptions = new MarkerOptions().flat(true).anchor(0.5f, 0.5f)
//                .icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow)).position(latLng)
//                .rotate(0);
//        return (Marker) mBaiduMap.addOverlay(markerOptions);
//    }
}

至于具体的调用方法就不多说了，直接初始化这个工具之后调用划线和移动的方法就好了，这样我们的Marker移动就支持平滑，拐点，计算角度了，由于源码程序太大，暂时不支持优快云下载，有需要的朋友可以留言。。