Android?通过地名获得经纬度并标识在地图上???--?未审核
编辑文档
要是调用Geocoder的getFromLocationName()，该方法可以传入地名。
在使用该方法前需要geo?=?new?Geocoder(this,?Locale.CHINA);
不然在地图上是查询不到的。
Java代码
/**
*
*/
package?com.decarta.demo;
import?java.io.IOException;
import?java.util.List;
import?java.util.Locale;
import?Android.app.AlertDialog;
import?android.app.Dialog;
import?android.content.Context;
import?android.graphics.Bitmap;
import?android.graphics.BitmapFactory;
import?android.graphics.Canvas;
import?android.graphics.Point;
import?android.location.Address;
import?android.location.Geocoder;
import?android.os.Bundle;
import?com.google.android.maps.GeoPoint;
import?com.google.android.maps.MapActivity;
import?com.google.android.maps.MapController;
import?com.google.android.maps.MapView;
import?com.google.android.maps.Overlay;
import?com.google.android.maps.Projection;
/**
*
*/
public?class?Main?extends?MapActivity?{
//?地图显示控制相关变量定义
private?MapView?map?=?null;
private?MapController?mapCon;
private?Geocoder?geo;
private?static?final?int?ERROR_DIALOG?=?1;
/**?Called?when?the?activity?is?first?created.?*/
@Override
public?void?onCreate(Bundle?savedInstanceState)?{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
geo?=?new?Geocoder(this,?Locale.CHINA);
//?获取MapView
map?=?(MapView)?findViewById(R.id.map);
//?设置显示模式
map.setTraffic(true);
map.setSatellite(false);
map.setStreetView(true);
//?设置可以缩放
map.setBuiltInZoomControls(true);
List
addresses?=?null;
try?{
addresses?=?geo.getFromLocationName("江苏省苏州市寒山寺",?1);
}?catch?(IOException?e)?{
//?TODO?Auto-generated?catch?block
e.printStackTrace();
}
if(addresses.size()?==?0)?{
showDialog(ERROR_DIALOG);
GeoPoint?geoBeijing?=?new?GeoPoint(
(int)?(39.906033*?1000000),
(int)?(116.397700?*?1000000));
mapCon?=?map.getController();
mapCon.setCenter(geoBeijing);
mapCon.setZoom(4);
}?else?{
Address?address?=?addresses.get(0);
//?设置初始地图的中心位置
GeoPoint?geoPoint?=?new?GeoPoint(
(int)?(address.getLatitude()?*?1000000),
(int)?(address.getLongitude()?*?1000000));
mapCon?=?map.getController();
mapCon.setCenter(geoPoint);
mapCon.setZoom(16);
List?overlays?=?this.map.getOverlays();
overlays.add(new?PositionOverlay(geoPoint,?this,?R.drawable.ic_red_pin));
}
}
@Override
protected?boolean?isRouteDisplayed()?{
return?false;
}
@Override
protected?Dialog?onCreateDialog(int?id)?{
return?new?AlertDialog.Builder(this).setTitle("查询出错哦")
.setMessage("路名/地名出错，请重新输入!").create();
}
class?PositionOverlay?extends?Overlay?{
private?GeoPoint?geoPoint;
private?Context?context;
private?int?drawable;
public?PositionOverlay(GeoPoint?geoPoint,?Context?context,?int?drawable)?{
super();
this.geoPoint?=?geoPoint;
this.context?=?context;
this.drawable?=?drawable;
}
@Override
public?void?draw(Canvas?canvas,?MapView?mapView,?boolean?shadow)?{
Projection?projection?=?mapView.getProjection();
Point?point?=?new?Point();
projection.toPixels(geoPoint,?point);
Bitmap?bitmap?=?BitmapFactory.decodeResource(context.getResources(),
drawable);
canvas.drawBitmap(bitmap,?point.x-bitmap.getWidth()/2?,?point.y-bitmap.getHeight(),?null);
super.draw(canvas,?mapView,?shadow);
}
}
}
/**
*
*/
package?com.decarta.demo;
import?java.io.IOException;
import?java.util.List;
import?java.util.Locale;
import?android.app.AlertDialog;
import?android.app.Dialog;
import?android.content.Context;
import?android.graphics.Bitmap;
import?android.graphics.BitmapFactory;
import?android.graphics.Canvas;
import?android.graphics.Point;
import?android.location.Address;
import?android.location.Geocoder;
import?android.os.Bundle;
import?com.google.android.maps.GeoPoint;
import?com.google.android.maps.MapActivity;
import?com.google.android.maps.MapController;
import?com.google.android.maps.MapView;
import?com.google.android.maps.Overlay;
import?com.google.android.maps.Projection;
/**
*
*/
public?class?Main?extends?MapActivity?{
//?地图显示控制相关变量定义
private?MapView?map?=?null;
private?MapController?mapCon;
private?Geocoder?geo;
private?static?final?int?ERROR_DIALOG?=?1;
/**?Called?when?the?activity?is?first?created.?*/
@Override
public?void?onCreate(Bundle?savedInstanceState)?{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
geo?=?new?Geocoder(this,?Locale.CHINA);
//?获取MapView
map?=?(MapView)?findViewById(R.id.map);
//?设置显示模式
map.setTraffic(true);
map.setSatellite(false);
map.setStreetView(true);
//?设置可以缩放
map.setBuiltInZoomControls(true);
List
addresses?=?null;
try?{
addresses?=?geo.getFromLocationName("江苏省苏州市寒山寺",?1);
}?catch?(IOException?e)?{
//?TODO?Auto-generated?catch?block
e.printStackTrace();
}
if(addresses.size()?==?0)?{
showDialog(ERROR_DIALOG);
GeoPoint?geoBeijing?=?new?GeoPoint(
(int)?(39.906033*?1000000),
(int)?(116.397700?*?1000000));
mapCon?=?map.getController();
mapCon.setCenter(geoBeijing);
mapCon.setZoom(4);
}?else?{
Address?address?=?addresses.get(0);
//?设置初始地图的中心位置
GeoPoint?geoPoint?=?new?GeoPoint(
(int)?(address.getLatitude()?*?1000000),
(int)?(address.getLongitude()?*?1000000));
mapCon?=?map.getController();
mapCon.setCenter(geoPoint);
mapCon.setZoom(16);
List?overlays?=?this.map.getOverlays();
overlays.add(new?PositionOverlay(geoPoint,?this,?R.drawable.ic_red_pin));
}
}
@Override
protected?boolean?isRouteDisplayed()?{
return?false;
}
@Override
protected?Dialog?onCreateDialog(int?id)?{
return?new?AlertDialog.Builder(this).setTitle("查询出错哦")
.setMessage("路名/地名出错，请重新输入!").create();
}
class?PositionOverlay?extends?Overlay?{
private?GeoPoint?geoPoint;
private?Context?context;
private?int?drawable;
public?PositionOverlay(GeoPoint?geoPoint,?Context?context,?int?drawable)
{
super();
this.geoPoint?=?geoPoint;
this.context?=?context;
this.drawable?=?drawable;
}
@Override
public?void?draw(Canvas?canvas,?MapView?mapView,?boolean?shadow)?{
Projection?projection?=?mapView.getProjection();
Point?point?=?new?Point();
projection.toPixels(geoPoint,?point);
Bitmap?bitmap?=?BitmapFactory.decodeResource(context.getResources(),
drawable);
canvas.drawBitmap(bitmap,?point.x-bitmap.getWidth()/2?,?point.y-bitmap.getHeight(),?null);
super.draw(canvas,?mapView,?shadow);
}
}
}
效果图如下：
Android?通过地名获得经纬度并标识在地图上