求大神给一份在界面上加载地图的代码（不需要其他功能，网上的HELLO ANDROID有问题），不胜感激

protected void onCreate(Bundle savedInstanceState) { super。onCreate(savedInstanceState); setContentView(R。  layout。activity_pubs_info); title_tv = (TextView) findViewById(R。  id。title_text); title_tv。  setText("宾馆"); back_iv = (ImageView) findViewById(R。id。titleleft); back_iv。setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { close(); } }); search_iv = (ImageView) findViewById(R。    id。titlehorse); search_iv。setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Intent intent = new Intent(Activity_Pubs_listview。    this, PoiSearchActivity。class); startActivity(intent); } }); progressDialog = null; progressDialog = ProgressDialog。  show(Activity_Pubs_listview。  this, "请稍等。。。", "加载中。。。", true); // 初始化MapActivity mapManager = new BMapManager(getApplication()); // init方法的第一个参数需填入申请的APIKey mapManager。    init(Contants。BAIDUMAPSKEY2, null); super。initMapActivity(mapManager); mapView = (MapView) findViewById(R。  id。map_View); // 设置地图模式为交通地图 mapView。  setTraffic(true); // 设置启用内置的缩放控件 mapView。setBuiltInZoomControls(true); // 设置在缩放动画过程中也显示overlay,默认为不绘制 mapView。  setDrawOverlayWhenZooming(true); // 添加标注图层 mLocationOverlay = new MyLocationOverlay(this, mapView); mapView。    getOverlays()。add(mLocationOverlay); // 注册标注 mLocationListener = new LocationListener() { @Override public void onLocationChanged(Location location) { if (location != null) { geoPoint = new GeoPoint( (int) (location。    getLatitude() * 1e6), (int) (location。getLongitude() * 1e6)); Log。i("geoPoint", geoPoint。  getLatitudeE6() " " geoPoint。  getLongitudeE6()); mapView。getController()。  animateTo(geoPoint); mapController = mapView。getController(); // 设置地图的中心 mapController。    setCenter(geoPoint); // 设置地图默认的缩放级别 mapController。setZoom(16); // 初始化 MKSearch mMKSearch = new MKSearch(); mMKSearch。    init(mapManager, new MySearchListener()); // 搜索贵州大学校门口附近500米范围的自动取款机 mMKSearch。  SearchNearBy("酒指路人地图标注服务中心", geoPoint, 500); } } };。  。