(android 地图实战开发)2 创建MapActivity,根据设备当前位置，显示地图

(android 地图实战开发)2 创建MapActivity,根据设备当前位置，显示地图

 http://www.cnblogs.com/macroxu-1982/archive/2011/09/13/2174657.html

实现效果:

获取手机gps当前的位置,显示位置对于的google地图.

具体的步骤:

1 Step One  创建包含MapView控件的应用界面

  <com.google.android.maps.MapView

                 android:layout_width="fill_parent"

                 android:layout_height="fill_parent"

                 android:id="@+id/map_view"

                 android:clickable="true"

                 android:apiKey="0zoMLU7jtw20HSV-bpo6p81D6rFEvGwMz2BJqiw"

                 />

在这里主要有两个属性 clickable是否允许点击,true ,将捕获点击事件,并作出基于位置的响应.

apiKey :注册并允许基于地图开发的key,具体如何获得apikey 看上一篇

开发环境下配置google地图功能步骤

2 Step Two 初始化MapView

MapView map_view =(MapView)findViewById(R.id.map_view);

        map_view.setStreetView(true);

        map_view.setTraffic(true);

        map_view.setBuiltInZoomControls(true);

        map_view.setSatellite(false); 

     

主要几个方法说明:

  setStreetView (true) 是否显示街道信息

setTraffic(true) 是否显示交通信息

setSatellite(false)是否显示卫星图，如True显示卫星图，false 显示地图

3 Step Three 获取终端GPS位置

l  获取服务位置服务

       String context=Context.LOCATION_SERVICE;

locationManager=(LocationManager)getSystemService(context);

  String provider=LocationManager.GPS_PROVIDER;

l  获取当前地理位置

1         获取定位服务的最后一次定位信息

location =locationManager.getLastKnownLocation(provider);

2         更新当前的定位信息

locationManager.requestLocationUpdates(provider, 0, 0, locationListener );

4 Step Four 显示定位下的地图信息

        MapController mapcontroller=map_view.getController();

       

        GeoPoint point=getCurrentPoint();// 设置地图的当前位置信息

        mapcontroller.setCenter(point);

        mapcontroller.setZoom(20);

        mapcontroller.animateTo(point);

下面是完整的实现代码：

界面代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  
   <com.google.android.maps.MapView
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"
                 android:id="@+id/map_view"
                 android:clickable="true"
                 android:apiKey="0zoMLU7jtw20HSV-bpo6p81D6rFEvGwMz2BJqiw"
                 />
  
</LinearLayout>

后台代码：

publicclass LocationMap extends MapActivity {
    LocationManager locationManager;
     @Override   
      publicvoid onCreate(Bundle savedInstanceState) {  
          super.onCreate(savedInstanceState);  
         setContentView(R.layout.locationmap);
         
        //设置地图control 
        MapView map_view =(MapView)findViewById(R.id.map_view);
        map_view.setStreetView(true);
        map_view.setTraffic(true);
        map_view.setBuiltInZoomControls(true);
        map_view.setSatellite(false);  
        MapController mapcontroller=map_view.getController();
        
        GeoPoint point=getCurrentPoint();// 设置地图的当前位置信息
        mapcontroller.setCenter(point);
        mapcontroller.setZoom(20);
        mapcontroller.animateTo(point);
        
     }
     @Override
        publicboolean onKeyDown(int keyCode, KeyEvent event) {
            if(keyCode == KeyEvent.KEYCODE_BACK){
                ViewUtility.NavigateActivate(LocationMap.this, Main.class);
            }
                returnfalse;
        }
    @Override
    protectedboolean isRouteDisplayed() {
        // TODO Auto-generated method stub
returnfalse;
    }


    
    private GeoPoint getCurrentPoint()
    {
        String context=Context.LOCATION_SERVICE;
        locationManager=(LocationManager)getSystemService(context);
        String provider=LocationManager.GPS_PROVIDER;
    
        Location location =locationManager.getLastKnownLocation(provider);
        
         if(location ==null){ //没有最后位置，更新gps,获取当前位置
             locationManager.requestLocationUpdates(provider, 0, 0, locationListener );
             location =locationManager.getLastKnownLocation(provider);
        } 
        
        GeoPoint point=null;
        if(location==null)
        {
            Double lat=37.422006*1E6; //默认值
            Double lng=-122.084095*1E6;
            point=new GeoPoint(lat.intValue(),lng.intValue());
        }
        else//当前反馈的GPS位置
        {
            Double lat=location.getLatitude()*1E6;
            Double lng=location.getLongitude()*1E6;
          point=new GeoPoint(lat.intValue(),lng.intValue());
        }
        return point;
    }
     //创建位置监听器
private LocationListener locationListener =new LocationListener(){
              //位置发生改变时调用
            @Override
             publicvoid onLocationChanged(Location location) {
                 Log.d("Location", "onLocationChanged");
             }
    
             //provider失效时调用
       @Override
             publicvoid onProviderDisabled(String provider) {
               Log.d("Location", "onProviderDisabled");
             }
    
            //provider启用时调用
             @Override
           publicvoid onProviderEnabled(String provider) {
            Log.d("Location", "onProviderEnabled");
             }
     
             //状态改变时调用
             @Override
             publicvoid onStatusChanged(String provider, int status, Bundle extras) {
                Log.d("Location", "onStatusChanged");
             }
     };
    
    
    
}