這是效果圖，屏幕中的位置是興東地鐵站，左下方是洪浪北地鐵站
主要的算法公式為：
以A為中心點(diǎn)，已知其經(jīng)緯度為?lonA， latA?
已知其他位置坐標(biāo)的經(jīng)度為緯度 ?lon， lat
其座標(biāo)在手機(jī)屏幕位置：?
double? x =? ((lon-lonA)*111*Math.cos(lat/(2*π)));
double y = (lat-latA)*111;
代碼如下：
一、將經(jīng)緯度轉(zhuǎn)換成手機(jī)屏幕的座標(biāo)，并設(shè)置到ShipInfo對(duì)象中
public staticList makeScreenPoint() {
//興東
doubleLonA =113.91902814890139;
doublelatA =22.58129196196562;
List list =newArrayList<>();
//洪浪北
doubleLonB =113.91055236841433;
doubleLatB =22.57404034726216;
doubleπ =3.1415926535898;
doubleYb=? ((LatB-latA)*111);
doubleXb=? ((LonB-LonA)*111*Math.cos(LatB/(2*π)));
ShipInfo info1 =newShipInfo(0, -Xb,-Yb);
list.add(info1);
//留仙洞
doubleLonC =113.94364009882204;
doubleLatC =22.580182450018718;
doubleYc= ((LatC-latA)*111);
doubleXc= ((LonC-LonA)*111*Math.cos(LatC/(2*π)));
ShipInfo info2 =newShipInfo(1, -Xc,-Yc);
list.add(info2);
//TCL
doubleLond =113.92696748758547;
doubleLatd =22.567303532706593;
doubleYd= ((Latd-latA)*111);
doubleXd=? ((Lond-LonA)*111*Math.cos(Latd/(2*π)));
ShipInfo info3 =newShipInfo(2, -Xd,-Yd);
list.add(info3);
//文光村
doubleLone =113.949396119368;
doubleLate =22.569195818282925;
doubleYe=? ((Late-latA)*111);
doubleXe= ((Lone-LonA)*111*Math.cos(Late/(2*π)));
ShipInfo info4 =newShipInfo(3, -Xe,-Ye);
list.add(info4);
returnlist;
}
//shipinfo類
public classShipInfo {
private intship;//什么船
private doublelon;//經(jīng)度
private doublelat;//緯度
publicShipInfo(intship,doublelon,doublelat){
this.ship= ship;
this.lon= lon;
this.lat= lat;
}
public doublegetLon() {
returnlon;
}
public voidsetLon(doublelon) {
this.lon= lon;
}
public intgetShip() {
returnship;
}
public voidsetShip(intship) {
this.ship= ship;
}
public doublegetLat() {
returnlat;
}
public voidsetLat(doublelat) {
this.lat= lat;
}
}
二、在自定控件中調(diào)用canvas.drawBitmap(bimap,x,y,mPaint);
需要注意的在轉(zhuǎn)換到屏幕座標(biāo)時(shí) 中心點(diǎn)的位置最開始是在手機(jī)屏幕原點(diǎn)座標(biāo)的，所以需要將所有座標(biāo)平移到屏幕座標(biāo)
for(ShipInfo shipInfo:list)｛
floatx = (float) shipInfo.getLon()*90+getWidth()/2;
floaty = (float) shipInfo.getLat()*90+getHeight()/2;
｝
其中90代表的是比例，可任意設(shè)值，值越大，兩個(gè)位置之間的距離在屏幕上顯示的越大
