学步园

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：

public class LocationMap extends MapActivity {
    LocationManager locationManager;
     @Override   
public void 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
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode == KeyEvent.KEYCODE_BACK){
                ViewUtility.NavigateActivate(LocationMap.this, Main.class);
            }
return false;
        }
    @Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
        return false;
    }



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
public void onLocationChanged(Location location) {
                 Log.d("Location", "onLocationChanged");
             }

//provider失效时调用
       @Override
public void onProviderDisabled(String provider) {
               Log.d("Location", "onProviderDisabled");
             }

//provider启用时调用
             @Override
public void onProviderEnabled(String provider) {
            Log.d("Location", "onProviderEnabled");
             }

//状态改变时调用
             @Override
public void onStatusChanged(String provider, int status, Bundle extras) {
                Log.d("Location", "onStatusChanged");
             }
     };



}

             

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