(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

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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");
}
};

}