1. 计算小车转弯的角度，判断顺时逆时针。
2. 计算地图缩放比例，依据是一组经纬度的最大距离值
3. 在显示动画的时候地图是不能缩放的，因为经纬度和屏幕坐标转化不是实时的，数据是在调用接口时屏幕当前的比例尺转化。
4. 还有就是当动画前屏幕被缩放了，轨迹已经超出了屏幕显示，就计算下一个车辆到达的点在不在屏幕上，不在的话就移动地图，将该点设置为中心点，这个并不完善
5. 

代码片段

    @Overridepublic void MoveToPoint(List<LatLng> list) {/*** 设置地图移动到指定位置*/// 定义地图状态//数字越小，比例尺越大Double lat=new Double(0),lng=new Double(0);double latlng[]=new double[2];int zooms=getZoomnum(latlng,list);Log.i(TAG, "lat lng:" + latlng[0] + "__  " + latlng[1]+"zoom   "+zooms);MapStatus mMapStatus = new MapStatus.Builder().target(new LatLng(latlng[0],latlng[1])).zoom(zooms).build();// 定义MapStatusUpdate对象，以便描述地图状态将要发生的变化MapStatusUpdate mMapStatusUpdate = MapStatusUpdateFactory.newMapStatus(mMapStatus);// 改变地图状态mBaiduMap.setMapStatus(mMapStatusUpdate);}

//根据轨迹，一组坐标值计算缩放比例public int getZoomnum(double[] lalg,final List<LatLng> pointlist){int zoomSize[]={5,10,20,50,100,200,500,1000,2000,5000,10000,20000};//分别对应于zoom 21,20,19,18,17，16,15,14,13,12,11,10int i,j;double max=0,temp;for(i=0;i<pointlist.size();i++){for(j=i+1;j<pointlist.size();j++){temp=DistanceUtil.getDistance(pointlist.get(i),pointlist.get(j));if(temp>max){max=temp;lalg[0]=(pointlist.get(i).latitude+pointlist.get(j).latitude)/2;lalg[1]=(pointlist.get(i).longitude+pointlist.get(j).longitude)/2;Log.i(TAG,"lat lng:"+lalg[0]+"_dadsa_  "+lalg[1]);}}}Log.i(TAG,"max:  "+max);for(i=0;i<11;i++){if(max>zoomSize[i]*12&&max<zoomSize[i+1]*12) {Log.i(TAG,"ixiabio: "+i);return 20 - i;}}if(max<zoomSize[0]*12)return 21;else return 10;}

利用向量知识计算方向角，顺时针旋转为正，逆时针为负。

  //计算两个向量的方向角，并根据顺时针返回正值，逆时针返回负值public float getangle(Point p1,Point p2,Point p3){double xp1p2=p2.x-p1.x;double yp1p2=p2.y-p1.y;double xp2p3=p3.x-p2.x;double yp2p3=p3.y-p2.y;double a1=Math.sqrt(xp1p2*xp1p2+yp1p2*yp1p2);double b1=Math.sqrt(xp2p3*xp2p3+yp2p3*yp2p3);double ab=xp1p2*xp2p3+yp1p2*yp2p3;float angle;if((a1*b1)!=0)angle =(float)Math.acos(ab/(a1*b1));else angle=0;double a_b=xp1p2*yp2p3-xp2p3*yp1p2;if(a_b<0)angle=-angle;return angle*180/(float)Math.PI;}

核心部分，动画绘制

//行车的时候，地图不能缩放，因为经纬度转化成坐标值是以当时地图的比例尺进行转化的public void rotateyAnimRun(final View view,final List<Point> list){//ObjectAnimator的父类是valueAnimator，爷爷类是Animator.List<Animator> lt= new ArrayList<Animator>();Log.i(TAG,"lt size: "+lt.size());int size=list.size();float t1=0f;AnimatorSet set = new AnimatorSet();int i=0;carPathlist_point=list;for (i=0;i<size-1;i++){Animator animator,animator2;int k=i;//计数车子不动相同的经纬度情况while(i<size-1&&list.get(i).x==list.get(i+1).x&&list.get(i).y==list.get(i+1).y)i++;if(i==size-1)break;Log.i(TAG,"坐标： "+list.get(i).x+"____"+list.get(i).y);//PropertyValuesHolder属性holder，分别设置X，Y方向的移动值，然后调用ofPropertyValuesHolder设置属性值，这个是异步叠加动画。//参数指的是相对于view最初位置的偏移值PropertyValuesHolder pvhX = PropertyValuesHolder.ofFloat("translationX", list.get(i).x-list.get(0).x,list.get(i+1).x-list.get(0).x);PropertyValuesHolder pvhY = PropertyValuesHolder.ofFloat("translationY", list.get(i).y-list.get(0).y,list.get(i+1).y-list.get(0).y);PropertyValuesHolder pvhR;//监听在小车运行的时候如果下一个坐标点不在地图内，则将地图的中心点设置为下一个坐标点。class newAnListener implements Animator.AnimatorListener{private int center;public newAnListener(int center_){center=center_;}@Overridepublic void onAnimationStart(Animator animation) {WindowManager wm = (WindowManager) BaiduMapActivity.this.getSystemService(Context.WINDOW_SERVICE);int width = wm.getDefaultDisplay().getWidth();int height = wm.getDefaultDisplay().getHeight();Log.i(TAG, "width: " + width + "height: " + height + "mapCenter: " + center);Log.i(TAG, "x: " + list.get(center + 1).x + "y: " + list.get(center + 1).y);if (list.get(center + 1).x < 0 ||list.get(center + 1).y < 0 ||list.get(center + 1).x > width ||list.get(center + 1).y > height) {Log.i(TAG, "不是大了就是小了");MapStatusUpdate mMapStatusUpdate = MapStatusUpdateFactory.newLatLng(carPathlist.get(center));// 改变地图状态mBaiduMap.setMapStatus(mMapStatusUpdate);}}@Overridepublic void onAnimationEnd(Animator animation) {}@Overridepublic void onAnimationCancel(Animator animation) {}@Overridepublic void onAnimationRepeat(Animator animation) {}};if(k==0) {float angle =getangle(new Point(list.get(i).x-1,list.get(i).y),list.get(i),list.get(i+1));Log.i(TAG, "angle:   "+angle);t1=t1+angle;pvhR = PropertyValuesHolder.ofFloat("rotation", t1);animator2=ObjectAnimator.ofPropertyValuesHolder(view, pvhR).setDuration(500);animator2.addListener(new newAnListener(i));}else{Log.i(TAG,"k:   "+k+"i:   "+i);float angle =getangle(list.get(k-1),list.get(i),list.get(i+1));Log.i(TAG, "angle:   "+angle);t1=t1+angle;pvhR = PropertyValuesHolder.ofFloat("rotation", t1);animator2=ObjectAnimator.ofPropertyValuesHolder(view, pvhR).setDuration(500);animator2.addListener(new newAnListener(i));}animator= ObjectAnimator.ofPropertyValuesHolder(view, pvhX, pvhY).setDuration(1000);//先旋转再直行lt.add(animator2);lt.add(animator);}//顺序执行Animator list中的动画效果set.playSequentially(lt);set.addListener(new Animator.AnimatorListener() {@Overridepublic void onAnimationStart(Animator animation) {//所有手势不可用mUiSettings.setAllGesturesEnabled(false);mMapView.showZoomControls(false);lay_showpath.setClickable(false);Log.i(TAG, "set_____________start");}@Overridepublic void onAnimationEnd(Animator animation) {mMapView.removeViewInLayout(view);//所有手势可用mUiSettings.setAllGesturesEnabled(true);mMapView.showZoomControls(true);lay_showpath.setClickable(true);Log.i(TAG, "set_____________end");}@Overridepublic void onAnimationCancel(Animator animation) {}@Overridepublic void onAnimationRepeat(Animator animation) {}});
//可以将会设置绘制动画，设置在监听百度地图已经加载完毕的事件里set.start();Log.i(TAG, "lt end size: " + lt.size());}

添加该view到百度地图。

    @Overridepublic void    DrawDynaPath(final List<LatLng> pointlist) {//获取小车的viewBitmap bitmap= BitmapFactory.decodeResource(getResources(), R.drawable.ic_vehicle_location_current);ImageView iv=new ImageView(this);iv.setImageBitmap(bitmap);Log.i(TAG, "size():" + pointlist.size());Projection pj=mBaiduMap.getProjection();//所有经纬度转化成坐标List<Point> list=new ArrayList<Point>();for(LatLng ll:pointlist){list.add(pj.toScreenLocation(ll));}mMapView.removeViewInLayout(iv);//    layoutMode(MapViewLayoutParams.ELayoutMode mode 指定 MapViewLayoutParams 的方式：屏幕坐标或者地图经纬度坐标//absoluteMode是不随地图变化而移动的，mapMode是随地图移动MapViewLayoutParams mlp = new MapViewLayoutParams.Builder().layoutMode(MapViewLayoutParams.ELayoutMode.mapMode).position(pointlist.get(0)).width(MapViewLayoutParams.WRAP_CONTENT).height(MapViewLayoutParams.WRAP_CONTENT).build();Log.i(TAG,"list.get(0):"+list.get(0).toString());
//        mMapView.removeAllViews();rotateyAnimRun(iv, list);mMapView.addView(iv, mlp);
//        layout_baidumap.removeAllViewsInLayout();
//        mMapView.addView(parent);mMapView.refreshDrawableState();}