android GPS信息获取

在androi中GPS信息的获取可以通过系统提供的LOCATION_SERVICE中的GPS_PROVIDER获取

[java]
LocationManager GpsManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
Location location = GpsManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

其中Location 中比较常用的信息有：
[java]
/*
location.getAccuracy();    精度
location.getAltitude();    高度 : 海拔
location.getBearing();     导向
location.getSpeed();       速度
location.getLatitude();    纬度
location.getLongitude();   经度
location.getTime();        UTC时间以毫秒计
*/

GPS信息主要通过注册回调函数，设定限定条件让系统服务主动通知，限定条件有以下两种

1.距离：当移动距离超过设定值时系统会主动通知以米记
2.时间：当时间超过设定值时系统会主动通知以豪秒记
[java]
GpsManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 10, new GpsLocationListener());
这里设定的是1秒钟，10米为限定条件

以下给出具体的实例：

1.在布局文件中增加一个显示具体信息的文本（activity_wifi_example.xml）
[html]
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center" >

    <TextView
        android:id="@+id/TextView_GpsInfo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</LinearLayout>

2.在代码中注册回调，设定好限制条件，实时刷新GPS状态信息 (GpsExample.java)

[java]
package com.example.gp易做图ample;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class GpsExample extends Activity {

    private final String TAG = "GpsExample";

    private TextView        mGpsInfo;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gps_example);

        mGpsInfo      = (TextView)this.findViewById(R.id.TextView_GpsInfo);
        LocationManager GpsManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
        Location        location    = GpsManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

        printGpsLocation(location);
        if( location == null ) {
            mGpsInfo.setText("暂无GPS有效信息");
        }
        GpsManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 10, new GpsLocationListener());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_gps_example, menu);
        return true;
    }

    public void printGpsLocation(Location location)
    {
        if( location != null )
        {
            /*
            location.getAccuracy();    精度
            location.getAltitude();    高度 : 海拔
            location.getBearing();     导向
            location.getSpeed();       速度
            location.getLatitude();    纬度
            location.getLongitude();   经度
            location.getTime();        UTC时间以毫秒计
            */

            mGpsInfo.setText("Accuracy : " + location.getAccuracy() +
                    "\nAltitude : " + location.getAltitude() +
                    "\nBearing : " + location.getBearing() +
                    "\nSpeed : " + location.getSpeed() +
                    "\nLatitude ：" + location.getLatitude() +
                    "\nLongitude : " + location.getLongitude() +
                    "\nTime : " + location.getTime());
        }
    }

    public class GpsLocationListener implements LocationListener
    {
        public void onLocationChanged(Location location) {
   &n

补充：移动开发 , Android ,