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:
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package com.jlau.wjyuezhao.baidumapdemo;
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import android.content.Context;
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import android.content.Intent;
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import android.graphics.Color;
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import android.os.Handler;
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import android.os.Looper;
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import android.util.Log;
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import com.baidu.mapapi.map.BaiduMap;
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import com.baidu.mapapi.map.BitmapDescriptorFactory;
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import com.baidu.mapapi.map.MapStatus;
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import com.baidu.mapapi.map.MapStatusUpdateFactory;
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import com.baidu.mapapi.map.MapView;
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import com.baidu.mapapi.map.Marker;
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import com.baidu.mapapi.map.MarkerOptions;
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import com.baidu.mapapi.map.OverlayOptions;
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import com.baidu.mapapi.map.Polyline;
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import com.baidu.mapapi.map.PolylineOptions;
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import com.baidu.mapapi.model.LatLng;
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import com.baidu.mapapi.utils.DistanceUtil;
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import java.text.SimpleDateFormat;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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public class MarkMoveUtil {
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private static double sl0 ;
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private static double slt;
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private static double el0;
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private static double elt;
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private static double param ;
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private BaiduMap mBaiduMap;
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private Polyline mPolyline;
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private Marker mMoveMarker;
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private Handler mHandler;
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private MapView mMapView;
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private static List latlngs;
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private double time_interval = 8;
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private Context context;
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private final String ACTION_NAME = "发送广播";
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public MarkMoveUtil(double sl0,double slt,double param,MapView mMapView,Marker marker,Context context
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){
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this.sl0 = sl0;
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this.slt = slt;
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this.param = param;
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this.mMapView = mMapView;
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this.mBaiduMap = mMapView.getMap();
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this.mMoveMarker = marker;
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this.context = context;
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mHandler = new Handler(Looper.getMainLooper());
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MapStatus.Builder builder = new MapStatus.Builder();
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builder.target(new LatLng(slt,sl0));
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builder.zoom(11.0f);
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mBaiduMap.setMapStatus(MapStatusUpdateFactory.newMapStatus(builder.build()));
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}
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private static void getLatlngs(double sl0, double slt, double el0, double elt){
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Log.e("CCC",el0+":"+elt);
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double a = elt - slt;
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double b = el0 - sl0;
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double c = a/param;
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double d = b/param;
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latlngs = new ArrayList<>();
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for(int i = 0;i < param;i++){
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double lat = slt + c * i;
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double lon = sl0 + d * i;
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latlngs.add(new LatLng(lat,lon) );
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}
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}
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public void drawPolyLine() {
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List polylines = new ArrayList<>();
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for (int index = 0; index < latlngs.size(); index++) {
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polylines.add(latlngs.get(index));
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}
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polylines.add(latlngs.get(0));
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PolylineOptions polylineOptions = new PolylineOptions().points(polylines).width(10).color(Color.RED);
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mPolyline = (Polyline) mBaiduMap.addOverlay(polylineOptions);
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}
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private double getAngle(int startIndex) {
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if ((startIndex + 1) >= mPolyline.getPoints().size()) {
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throw new RuntimeException("index out of bonds");
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}
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LatLng startPoint = mPolyline.getPoints().get(startIndex);
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LatLng endPoint = mPolyline.getPoints().get(startIndex + 1);
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return getAngle(startPoint, endPoint);
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}
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private double getAngle(LatLng fromPoint, LatLng toPoint) {
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double slope = getSlope(fromPoint, toPoint);
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if (slope == Double.MAX_VALUE) {
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if (toPoint.latitude > fromPoint.latitude) {
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return 0;
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} else {
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return 180;
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}
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}
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float deltAngle = 0;
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if ((toPoint.latitude - fromPoint.latitude) * slope < 0) {
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deltAngle = 180;
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}
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double radio = Math.atan(slope);
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double angle = 180 * (radio / Math.PI) + deltAngle - 90;
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return angle;
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}
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private double getInterception(double slope, LatLng point) {
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double interception = point.latitude - slope * point.longitude;
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return interception;
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}
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private double getSlope(LatLng fromPoint, LatLng toPoint) {
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if (toPoint.longitude == fromPoint.longitude) {
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return Double.MAX_VALUE;
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}
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double slope = ((toPoint.latitude - fromPoint.latitude) / (toPoint.longitude - fromPoint.longitude));
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return slope;
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}
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private double getDistance(){
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double distance = DistanceUtil.getDistance(latlngs.get(0), latlngs.get((int) param -1));
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double v = distance /10000;
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double theDistance = v * (time_interval/1000);
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return theDistance;
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}
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public void moveLooper() {
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new Thread() {
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public void run() {
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Log.e("TAG", "start time:"+getCurrentTime());
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for (int i = 0; i < latlngs.size() - 1; i++) {
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final LatLng startPoint = latlngs.get(i);
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final LatLng endPoint = latlngs.get(i+1);
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mMoveMarker
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.setPosition(startPoint);
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mHandler.post(new Runnable() {
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@Override
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public void run() {
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if (mMapView == null) {
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return;
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}
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mMoveMarker.setRotate((float) getAngle(startPoint,
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endPoint));
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}
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});
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double slope = getSlope(startPoint, endPoint);
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boolean isReverse = (startPoint.latitude > endPoint.latitude);
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double intercept = getInterception(slope, startPoint);
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double xMoveDistance = isReverse ? getDistance() :
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-1 * getDistance();
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for (double j = startPoint.latitude; !((j > endPoint.latitude) ^ isReverse);
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j = j - xMoveDistance) {
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LatLng latLng = null;
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if (slope == Double.MAX_VALUE) {
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latLng = new LatLng(j, startPoint.longitude);
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} else {
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latLng = new LatLng(j, (j - intercept) / slope);
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}
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final LatLng finalLatLng = latLng;
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mHandler.post(new Runnable() {
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@Override
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public void run() {
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if (mMapView == null) {
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return;
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}
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mMoveMarker.setPosition(finalLatLng);
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}
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});
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try {
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Thread.sleep((int)time_interval);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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}
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Log.e("TAG", "end time:"+getCurrentTime());
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sl0 = el0;
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slt = elt;
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Intent mIntent = new Intent(ACTION_NAME);
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mIntent.putExtra("yaner", "发送广播,相当于在这里传送数据");
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context.sendBroadcast(mIntent);
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}
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}.start();
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}
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public static void start(LatLng latLng){
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el0 = latLng.longitude;
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elt =latLng.latitude;
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getLatlngs(sl0,slt,el0,elt);
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}
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private String getCurrentTime(){
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SimpleDateFormat formatter = new SimpleDateFormat ("yyyy年MM月dd日 HH:mm:ss ");
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Date curDate = new Date(System.currentTimeMillis());
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String str = formatter.format(curDate);
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return str;
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}
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}
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CSDN下载,有需要的朋友可以留言。。
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