android132 360 05 手机定位

1.网络定位:根据ip地址定位,根据ip地址在实际地址数据库中查询实际地址。
缺点:动态ip导致地址不准确。
2.基站定位:3个基站就可以确定实际位置,定位范围是几百米到几公里不等。
3.GPS定位:美国卫星定位系统(北斗定位是中国的),至少3颗卫星就可以定位,GPS使用24颗卫星基本就可以覆盖全球90%范围,GPS不需要网络只要能够接受卫星信号就可以了,定位的精度比较准确几米到几十米不等。缺点是容易受云层和建筑干扰。
4.安卓采用A-GPS(辅助GPS定位系统),弥补GPS定位缺点,可以通过网络和GPS共同定位,如果GPS信号不强就用网络,网络信号不强就用GPS.范围是几米到几十米。
package com.itheima52.location;

import java.util.List;

import android.app.Activity;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
/*
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>        粗糙位置信息,
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"/>       模拟器模拟的经纬度坐标,
*/

//获取经纬度
public class MainActivity extends Activity {

    private TextView tvLocation;
    private LocationManager lm;
    private MyLocationListener listener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvLocation = (TextView) findViewById(R.id.tv_location);
        lm = (LocationManager) getSystemService(LOCATION_SERVICE);
        List<String> allProviders = lm.getAllProviders();// 获取所有位置提供者(网络(NETWORK_PROVIDER = "network"),基站(PASSIVE_PROVIDER = "passive"),GPS(GPS_PROVIDER = "gps"))
        System.out.println(allProviders);
        listener = new MyLocationListener();
        // 参1表示位置提供者(通过GPS更新),参2表示最短更新位置时间0表示立即更新,参3表示最短更新位置距离0表示立即更新。
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listener);
    }

    class MyLocationListener implements LocationListener {

        // 位置发生变化回调
        @Override
        public void onLocationChanged(Location location) {
            String j = "经度:" + location.getLongitude();
            String w = "纬度:" + location.getLatitude();
            String accuracy = "精确度:" + location.getAccuracy();
            String altitude = "海拔:" + location.getAltitude();
            tvLocation.setText(j + "
" + w + "
" + accuracy + "
" + altitude);
        }

        // 位置提供者状态发生变化(GPS没有信号变成有信号)
        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            System.out.println("onStatusChanged");
        }

        // 用户打开gps
        @Override
        public void onProviderEnabled(String provider) {
            System.out.println("onProviderEnabled");
        }

        // 用户关闭gps
        @Override
        public void onProviderDisabled(String provider) {
            System.out.println("onProviderDisabled");
        }

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        lm.removeUpdates(listener);// 手机定位其实是启动了一个服务,当activity销毁时,服务不会停止,所以要手动停止更新位置, 节省电量,
    }

}
public class Demo {
//火星坐标
    public static void main(String[] args) {
        try {
            ModifyOffset instance = ModifyOffset.getInstance(ModifyOffset.class
                    .getResourceAsStream("axisoffset.dat"));
            PointDouble s2c = instance.s2c(new PointDouble(116.29049474,
                    40.04302021));// 标准坐标转化为火星坐标

            System.out.println(s2c);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
import java.io.InputStream;
import java.io.ObjectInputStream;

/**
 * 火星地球坐标转化.地图坐标修偏(火星坐标是人为加偏后的坐标)
 */
public class ModifyOffset {
    private static ModifyOffset modifyOffset;
    static double[] X = new double[660 * 450];
    static double[] Y = new double[660 * 450];


    private ModifyOffset(InputStream inputStream) throws Exception {
        init(inputStream);
    }

    public synchronized static ModifyOffset getInstance(InputStream is) throws Exception {
        if (modifyOffset == null) {
            modifyOffset = new ModifyOffset(is);
        }
        return modifyOffset;
    }

    public void init(InputStream inputStream) throws Exception {
        ObjectInputStream in = new ObjectInputStream(inputStream);
        try {
            int i = 0;
            while (in.available() > 0) {
                if ((i & 1) == 1) {
                    Y[(i - 1) >> 1] = in.readInt() / 100000.0d;
                    ;
                } else {
                    X[i >> 1] = in.readInt() / 100000.0d;
                    ;
                }
                i++;
            }
        } finally {
            if (in != null)
                in.close();
        }
    }

    // standard -> china
    public PointDouble s2c(PointDouble pt) {
        int cnt = 10;
        double x = pt.x, y = pt.y;
        while (cnt-- > 0) {
            if (x < 71.9989d || x > 137.8998d || y < 9.9997d || y > 54.8996d)
                return pt;
            int ix = (int) (10.0d * (x - 72.0d));
            int iy = (int) (10.0d * (y - 10.0d));
            double dx = (x - 72.0d - 0.1d * ix) * 10.0d;
            double dy = (y - 10.0d - 0.1d * iy) * 10.0d;
            x = (x + pt.x + (1.0d - dx) * (1.0d - dy) * X[ix + 660 * iy] + dx
                    * (1.0d - dy) * X[ix + 660 * iy + 1] + dx * dy
                    * X[ix + 660 * iy + 661] + (1.0d - dx) * dy
                    * X[ix + 660 * iy + 660] - x) / 2.0d;
            y = (y + pt.y + (1.0d - dx) * (1.0d - dy) * Y[ix + 660 * iy] + dx
                    * (1.0d - dy) * Y[ix + 660 * iy + 1] + dx * dy
                    * Y[ix + 660 * iy + 661] + (1.0d - dx) * dy
                    * Y[ix + 660 * iy + 660] - y) / 2.0d;
        }
        return new PointDouble(x, y);
    }

    // china -> standard
    public PointDouble c2s(PointDouble pt) {
        int cnt = 10;
        double x = pt.x, y = pt.y;
        while (cnt-- > 0) {
            if (x < 71.9989d || x > 137.8998d || y < 9.9997d || y > 54.8996d)
                return pt;
            int ix = (int) (10.0d * (x - 72.0d));
            int iy = (int) (10.0d * (y - 10.0d));
            double dx = (x - 72.0d - 0.1d * ix) * 10.0d;
            double dy = (y - 10.0d - 0.1d * iy) * 10.0d;
            x = (x + pt.x - (1.0d - dx) * (1.0d - dy) * X[ix + 660 * iy] - dx
                    * (1.0d - dy) * X[ix + 660 * iy + 1] - dx * dy
                    * X[ix + 660 * iy + 661] - (1.0d - dx) * dy
                    * X[ix + 660 * iy + 660] + x) / 2.0d;
            y = (y + pt.y - (1.0d - dx) * (1.0d - dy) * Y[ix + 660 * iy] - dx
                    * (1.0d - dy) * Y[ix + 660 * iy + 1] - dx * dy
                    * Y[ix + 660 * iy + 661] - (1.0d - dx) * dy
                    * Y[ix + 660 * iy + 660] + y) / 2.0d;
        }
        return new PointDouble(x, y);
    }

}

class PointDouble {
    double x, y;

    PointDouble(double x, double y) {
        this.x = x;
        this.y = y;
    }

    public String toString() {
        return "x=" + x + ", y=" + y;
    }
}

 通过service启动坐标定位:

package com.itheima52.mobilesafe.service;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;

/**
 * 获取经纬度坐标的service
 * 清单文件注册:<service android:name=".service.LocationService" ></service>
 * 
 * //Context context;
    context.startService(new Intent(context, LocationService.class));// 开启定位服务,调用LocationService的onCreate方法。
    SharedPreferences sp = context.getSharedPreferences("config",Context.MODE_PRIVATE);
    String location = sp.getString("location","getting location...");
    System.out.println("location:" + location);
    abortBroadcast();// 中断短信的传递, 从而系统短信app就收不到内容了,不中断则系统短信还是能够接收到短信。
 */
public class LocationService extends Service {

    private LocationManager lm;
    private MyLocationListener listener;
    private SharedPreferences mPref;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mPref = getSharedPreferences("config", MODE_PRIVATE);
        lm = (LocationManager) getSystemService(LOCATION_SERVICE);
        // List<String> allProviders = lm.getAllProviders();// 获取所有位置提供者
        // System.out.println(allProviders);
        Criteria criteria = new Criteria();
        criteria.setCostAllowed(true);// 是否允许付费,比如使用3g网络定位,如果设为false则没有GPS只有流量因为要流量钱就不开启。
        criteria.setAccuracy(Criteria.ACCURACY_FINE);//精确度为fine:一般的精确度。
        String bestProvider = lm.getBestProvider(criteria, true);// 获取最佳位置提供者,true表示Provider可用就返回,false表示不管可不可用都返回。
        listener = new MyLocationListener();
        lm.requestLocationUpdates(bestProvider, 0, 0, listener);// 参1表示位置提供者,参2表示最短更新时间,参3表示最短更新距离
    }

    //
    class MyLocationListener implements LocationListener {

        // 位置发生变化
        @Override
        public void onLocationChanged(Location location) {
            System.out.println("get location!");
            // 将获取的经纬度保存在sp中
            mPref.edit()
                    .putString(
                            "location",
                            "j:" + location.getLongitude() + "; w:"
                                    + location.getLatitude()).commit();
            
            stopSelf();//停掉service
        }
        // 位置提供者状态发生变化
        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            System.out.println("onStatusChanged");
        }
        // 用户打开gps
        @Override
        public void onProviderEnabled(String provider) {
            System.out.println("onProviderEnabled");
        }
        // 用户关闭gps
        @Override
        public void onProviderDisabled(String provider) {
            System.out.println("onProviderDisabled");
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        lm.removeUpdates(listener);// 当activity销毁时,停止更新位置, 节省电量,否则服务会一直开启。
    }
}
原文地址:https://www.cnblogs.com/yaowen/p/5115035.html