关于轨迹点操作的前后台实现和之前的登录注册差不多，这里主要说一下，用户查看自己的轨迹时候，在手机

端的显示。

1.从服务器把轨迹点拿下来

2.地图上显示点

3.把点连成线

看代码吧，注释比较详细，关键的画线操作就在OverItemT这个类中。

package seu.android007.xin;

import java.util.ArrayList;
import java.util.List;

import com.baidu.mapapi.BMapManager;
import com.baidu.mapapi.GeoPoint;
import com.baidu.mapapi.ItemizedOverlay;
import com.baidu.mapapi.LocationListener;
import com.baidu.mapapi.MapActivity;
import com.baidu.mapapi.MapView;
import com.baidu.mapapi.MyLocationOverlay;
import com.baidu.mapapi.OverlayItem;
import com.baidu.mapapi.Projection;
import seu.android007.service.TraceServcie;
import seu.xin.entity.Trace;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Toast;

public class MyTrace extends MapActivity {
static MapView mMapView = null;
LocationListener mLocationListener = null;// onResume时注册此listener，onPause时需要Remove
MyLocationOverlay mLocationOverlay = null; // 定位图层
static View mPopView = null; // 点击mark时弹出的气泡View
TraceServcie traceServcie;
private ArrayList myTraces = new ArrayList();
SharedPreferences sp;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_trace);
traceServcie = new TraceServcie();
sp = this.getSharedPreferences("data", MODE_WORLD_READABLE);
int uid = sp.getInt("uid", 0);
myTraces = traceServcie.findTracesByUid(uid);

BMapApp app = (BMapApp) this.getApplication();
if (app.mBMapMan == null) {
app.mBMapMan = new BMapManager(getApplication());
app.mBMapMan.init(app.mStrKey, new BMapApp.MyGeneralListener());
}
app.mBMapMan.start();
// 如果使用地图SDK，请初始化地图Activity
super.initMapActivity(app.mBMapMan);

mMapView = (MapView) findViewById(R.id.bmapView);
mMapView.setBuiltInZoomControls(true);
// 设置在缩放动画过程中也显示overlay,默认为不绘制
mMapView.setDrawOverlayWhenZooming(true);

// 添加定位图层
mLocationOverlay = new MyLocationOverlay(this, mMapView);
mMapView.getOverlays().add(mLocationOverlay);

// 注册定位事件
mLocationListener = new LocationListener() {

@Override
public void onLocationChanged(Location location) {
if (location != null) {
GeoPoint pt = new GeoPoint(
(int) (location.getLatitude() * 1e6),
(int) (location.getLongitude() * 1e6));
mMapView.getController().animateTo(pt);
}
}
};
if (myTraces.size() == 0) {
System.out.println("轨迹为空，调转到MyActivityGroup");
AlertDialog.Builder builder = new AlertDialog.Builder(MyTrace.this);
builder.setTitle("提醒");
builder.setMessage("没有轨迹，请添加后再查看");
builder.setPositiveButton("确定",
new DialogInterface.OnClickListener() {