主要的用途是讓當前使用者知道自己還有哪些使用者在使用此款app，為實現後續的約跑，聊天等功能做鋪墊。

要知道附近其他使用者必須先知道自己的定位，那就要用到之前文章中提到的定位功能，這裡不再講解。

呼叫後臺介面上傳當前使用者的x、y座標點。獲取後臺傳回的使用者的物件list。

List<UserBean> userlist = new ArrayList<UserBean>();
String resultData = String.valueOf(resultMap
.get("Data"));
Map jsonMap = JSON.parseObject(resultData
 
);
String jsonuserlist = String.valueOf(jsonMap.get("personList"));                 // 服務端返回資料 傳送訊息給handler處理資料
//附近使用者list
userlist.clear();
userlist= JSON.parseArray(jsonuserlist, UserBean.class);

if(!CheckUtils.isEmpty(userlist)){
    getMapMark();
}

getMapMark();該方法

private final int NEARBY_OVERLAYOPTIONS
 
=10000;
private final int NEARBY_UPMAPVIEW=20000;

private void getMapMark(){

      if(!CheckUtils.isEmpty(mBaiduMap)){
          mBaiduMap.clear();
}
      if(!CheckUtils.isEmpty(mLocationClient)){
          mLocationClient=null;
}
      mLocationClient = new LocationClient(mContext); // 宣告LocationClient類
 
mBaiduMap = mMapView.getMap();
// x：經度 y:緯度
Double x =Double.valueOf(format.format(globalApp.getLongitude()));
Double y = Double.valueOf(format.format(globalApp.getLatitude()));
// 定義Maker座標點
LatLng point = new LatLng(y, x);
       new addThread(userlist,point).start();
}

class addThread extends Thread{
   private  List<UserBean> userlist;
private LatLng point;
private boolean isTure;
public addThread( List<UserBean> userlist,LatLng point) {
      this.userlist=userlist;
this.point=point;
}

   @Override
public void run() {
      Looper.prepare();
isTure=false;
Bitmap bimp=drawBitmap(globalApp.getmUserBean().getNc(),globalApp.getmUserBean().getHeadUrl(),globalApp.getmUserBean().getXb());
if(!CheckUtils.isEmpty(bimp)){
         // 構建Marker圖示
BitmapDescriptor bitmap = BitmapDescriptorFactory.fromBitmap(bimp);
// 構建MarkerOption，用於在地圖上新增Marker
OverlayOptions option = new MarkerOptions().position(point)
               .icon(bitmap);
// 在地圖上新增Marker，並顯示
Message m=new Message();
m.what=NEARBY_OVERLAYOPTIONS;
m.obj=option;
NearbyFragment.this.handler.sendMessage(m);
if(!CheckUtils.isEmpty(userlist)) {
            for (int i = 0; i < userlist.size(); i++) {
               // x：經度 y:緯度
Double x1 = Double.valueOf(userlist.get(i).getX());
Double y1 = Double.valueOf(userlist.get(i).getY());
// 定義Maker座標點
LatLng point1 = new LatLng(y1, x1);
Bitmap bimp1 = drawBitmap(userlist.get(i).getNc(), userlist.get(i).getHeadUrl(), userlist.get(i).getXb());
if (!CheckUtils.isEmpty(bimp1)) {

                  // 構建Marker圖示
BitmapDescriptor bitmap1 = BitmapDescriptorFactory.fromBitmap(bimp1);
// 構建MarkerOption，用於在地圖上新增Marker
OverlayOptions option1 = new MarkerOptions().position(point1)
                        .icon(bitmap1);
m=new Message();
m.what=NEARBY_OVERLAYOPTIONS;
m.obj=option1;
NearbyFragment.this.handler.sendMessage(m);
}
            }
         }
         Message m2=new Message();
m2.what=NEARBY_UPMAPVIEW;
m2.obj=point;
NearbyFragment.this.handler.sendMessage(m2);
}
      Looper.loop();
}
   private int anInt;
public Bitmap drawBitmap(String title, final String picUrl, String sex) {
      Bitmap bmp = Bitmap.createBitmap(DisplayUtil.dip2px(mContext, 40), DisplayUtil.dip2px(mContext, 51), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bmp);
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.custom_text_view, null);
AppCompatImageView ivGps= (AppCompatImageView) layout.findViewById(R.id.sex_img_gps);
if(!CheckUtils.isEmpty(sex)){
         if(sex.equals("2")){
            ivGps.setImageResource(R.drawable.ic_sex_woman_bg);
//                ivGps.setBackgroundResource(R.drawable.ic_sex_woman_bg);
}else{//男1
ivGps.setImageResource(R.drawable.ic_sex_man_bg);
//                ivGps.setBackgroundResource(R.drawable.ic_sex_man_bg);
}
      }
      //        TextView titleView = (TextView) layout
      //                .findViewById(R.id.driver_location_name);
isTure=true;
CircleImageView iv= (CircleImageView) layout.findViewById(R.id.driver_overlay_master);
BitmapUtils.display(iv, picUrl, new Callback.CacheCallback<Drawable>() {
         @Override
public boolean onCache(Drawable drawable) {
            isTure=false;
return false;
}

         @Override
public void onSuccess(Drawable drawable) {
            //                LogUtil.e("下載成功");
isTure=false;
}

         @Override
public void onError(Throwable throwable, boolean b) {
            //                LogUtil.e("下載出錯，" + arg0.getMessage());
isTure=false;
}

         @Override
public void onCancelled(CancelledException e) {
            //                LogUtil.e("下載取消");
isTure=false;
}

         @Override
public void onFinished() {
            //                LogUtil.e("下載完成");
isTure=false;
}
      });
while (isTure){
         try {
            Thread.sleep(200);
}catch (InterruptedException e) {
            e.printStackTrace();
}
         System.out.println("等待圖片的下載"+(anInt+1));
}
      anInt+=1;
//        titleView.setText(title);
layout.setDrawingCacheEnabled(true);
layout.measure(View.MeasureSpec.makeMeasureSpec(canvas.getWidth(),
View.MeasureSpec.EXACTLY), View.MeasureSpec
.makeMeasureSpec(canvas.getHeight(),
View.MeasureSpec.EXACTLY));
layout.getMeasuredHeight();
Paint paint = new Paint();
layout.layout(0, 0, layout.getMeasuredWidth(), layout.getMeasuredHeight());
layout.buildDrawingCache();
Bitmap bm = layout.getDrawingCache();
//layout.draw(canvas);
canvas.drawBitmap(bm, 0, 0, paint);
return bmp;
}
};