Android客户端GPS定位
AndroidManifest.xml文件配置：
View Code
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.itcast.main"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Main"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<uses-library android:name="com.google.android.maps" />
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FIND_LOCATION" />
</manifest>
Main.java文件：
View Code
package cn.itcast.main;
import java.util.List;
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 android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.MotionEvent;
import android.widget.TextView;
public class Main extends MapActivity{
private MapController mapController;
private GeoPoint geoPoint;
private String msg;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//获得mapview
MapView mapView=(MapView) this.findViewById(R.id.mapview);
//地图的显示格式为交通图
mapView.setTraffic(true);
//设置可控
mapView.setClickable(true);
mapView.setEnabled(true);
mapView.setBuiltInZoomControls(true);
//得到gps设备的访问
LocationManager locationManager=(LocationManager) getSystemService(Context.LOCATION_SERVICE);
//设置gps定位配置
Criteria criteria=new Criteria();
//设置显示精度
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
//是否获得海拔数据
criteria.setAltitudeRequired(false);
//是否获得方向数据
criteria.setBearingRequired(false);
//是否允许运营商计费
criteria.setCostAllowed(true);
//设置耗电程度
criteria.setPowerRequirement(Criteria.POWER_LOW);
//获得服务供应商
String provider=locationManager.getBestProvider(criteria, true);
//获取上一个定位点
Location location=locationManager.getLastKnownLocation(provider);
//获得gps定位坐标信息
Double latitude=location.getLatitude()*1E6;
Double longitude=location.getLongitude()*1E6;
//获得卫星定位点
geoPoint=new GeoPoint(latitude.intValue(),longitude.intValue());
//获得地图控制器
mapController=mapView.getController();
//设置地图显示初始化精度
mapController.setZoom(12);
mapController.animateTo(geoPoint);
//实例化自定义绘图层
MyOverlay myOverlay=new MyOverlay();
//为mapview添加绘图层
mapView.getOverlays().add(myOverlay);
//定义一个final，TextView，以备子类引用
final TextView textView=(TextView) findViewById(R.id.textview);
LocationListener locationListener=new LocationListener() {
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location location) {
Double latitude=location.getLatitude()*1E6;
Double longitude=location.getLongitude()*1E6;
try {
//获得精度纬度字符串
msg = "经度：" + location.getLongitude() + "\n";
msg += "纬度：" + location.getLatitude() + "\n";
//根据经纬度获得改点地址信息
Geocoder gc=new Geocoder(Main.this);
List<Address> addresses=gc.getFromLocation(latitude, longitude, 1);
if (addresses.size()>0) {
//获得地址信息
msg+="AddressLine:"+addresses.get(0).getAddressLine(0)+"\n";
//获得国家名
msg += "CountryName：" + addresses.get(0).getCountryName()+"\n";
msg += "Locality：" + addresses.get(0).getLocality() + "\n";
msg += "FeatureName：" + addresses.get(0).getFeatureName();
}
textView.setText(msg);
} catch (Exception e) {
e.printStackTrace();
}
}
};
//注册位置监听器，1秒钟扫描1次
locationManager.requestLocationUpdates(provider, 1000, 0, locationListener);
}
class MyOverlay extends Overlay{
//保证触控事件不重复操作
private int count=0;
@Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
long when) {
//定义画笔
Paint paint=new Paint();
paint.setColor(Color.RED);
//定义屏幕点
Point screenPoint=new Point();
//gps点转屏幕点
mapView.getProjection().toPixels(geoPoint, screenPoint);
//获得gps标志点图片
Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.flag);
//绘制gps点图片
canvas.drawBitmap(bitmap, screenPoint.x,screenPoint.y, paint);
//绘制文字说明
canvas.drawText("当前位置", screenPoint.x, screenPoint.y, paint);
return super.draw(canvas, mapView, shadow, when);
}
@Override
public boolean onTouchEvent(MotionEvent e, MapView mapView) {
//定义一个屏幕点
Point screenPoint=new Point();
//把gps点变成屏幕点
mapView.getProjection().toPixels(geoPoint, screenPoint);
//获得触点坐标
int currentX=(int) e.getX();
int currentY=(int) e.getY();
//在50，30范围内触碰，显示当前经纬度
if ((currentX-screenPoint.x)>=0&&(currentX-screenPoint.x)<50
&&(currentY-screenPoint.y>=0)&&(currentY-screenPoint.y)<30) {
if (count==0) {
new AlertDialog.Builder(Main.this).setMessage(msg)
.setPositiveButton("确定",new OnClickListener(){
@Override
public void onClick(DialogInterface dialog, int which) {
count=0;
}
}).show();
}
count++;
}
return super.onTouchEvent(e, mapView);
}
}
@Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
注1：如果你的手机上没有gps定位系统，会有以下错误
08-10 13:04:55.610: ERROR/AndroidRuntime(492): java.lang.RuntimeException: Unable to start activity ComponentInfo{cn.itcast.main/cn.itcast.main.Main}: java.lang.IllegalArgumentException: provider==null
注2：记得去google官网
http://code.google.com/intl/zh-CN/android/maps-api-signup.html
申请自己机器的apikey
C:\Documents and Settings\Administrator\.android>keytool -list -keystore debug.kEystore
默认密码android
我机器的apikey，你用不好使
View Code
<com.google.android.maps.MapView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:apiKey="0EITsWoXq7NC_mgKW6yIxIViNLhMGsIW4dbmlsg
/>
最终实现效果：随着android客户端得移动，在地图上提供精确的当前所在位置
