在Android中通过GPS获得当前位置，首先要获得一个LocationManager实例，通过该实例的getLastKnownLocation()方法获得第一个的位置，该方法的说明如下：
void android.location.LocationManager.requestLocationUpdates(String provider, long minTime, float minDistance, LocationListener listener)
provider即定位方式，可以采用GPS定位(LocationManager.GPS_PROVIDER)或者网络定位(LocationManager.NETWORK_PROVIDER)，本文是GPS定位，因此使用LocationManager.GPS_PROVIDER。minTime是位置更新的间隔时间。listener是位置改变的监听器，自己定义一个LocationListener()，重写onLocationChanged()，加入位置改变时的动作。
布局文件：
<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:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/txt_time"
style="@style/my_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="时间:" />
<TextView
android:id="@+id/txt_lat"
style="@style/my_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="经度:" />
<TextView
android:id="@+id/txt_lng"
style="@style/my_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="纬度:" />
</LinearLayout>
MainActivity.java文件：
package com.hzhi.my_gps;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView txt_time;
TextView txt_lat;
TextView txt_lng;
LocationManager lom;
Location loc;
Double lat;
Double lng;
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date now;
String str_date;
Timer timer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
get_con();
get_gps();
timer = new Timer(true);
timer.schedule(task, 0, 1000);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void get_gps(){
lom = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
loc = lom.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (loc != null) {
lat = loc.getLatitude();
lng = loc.getLongitude();
txt_lat.setText("纬度:" + String.valueOf(lat));
txt_lng.setText("经度:" + String.valueOf(lng));
}
else{
txt_lat.setText("纬度:未知" );
txt_lng.setText("经度:未知" );
}
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = lom.getBestProvider(criteria, true);
lom.requestLocationUpdates(provider, 1000, 10, los);
}
LocationListener los = new LocationListener(){
public void onLocationChanged(Location location){
if (location != null) {
lat = location.getLatitude();
lng = location.getLongitude();
txt_lat.setText("纬度:" + String.valueOf(lat));
txt_lng.setText("经度:" + String.valueOf(lng));
}
else{
txt_lat.setText("纬度:未知" );
txt_lng.setText("经度:未知" );
}
};
public void onProviderDisabled(String provider){
};
public void onProviderEnabled(String provider){ };
public void onStatusChanged(String provider, int status,
Bundle extras){ };
};
// 获取控件
public void get_con(){
txt_time = (TextView) findViewById(R.id.txt_time);
txt_lat = (TextView) findViewById(R.id.txt_lat);
txt_lng = (TextView) findViewById(R.id.txt_lng);
}
Handler handler = new Handler(){
public void handleMessage(Message msg){
switch (msg.what){
case 1:
get_time();
break;
}
}
};
TimerTask task = new TimerTask(){
public void run() {
Message message = new Message();
message.what = 1;
handler.sendMessage(message);
}
};
// 获取时间
public void get_time(){
now = new Date(System.currentTimeMillis());
str_date = formatter.format(now);
txt_time.setText("时间:" + str_date);
}
}
在AndroidManifest.xml文件中加入权限：
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
运行前先打开GPS卫星，运行结果：
由于在室内，并且手机质量不好，没获取出来，在室外是可以获取的。