Android GPS定位

package sn.qdj.localgpsdemo;

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.widget.EditText;
/**
 * GPS定位
 * @author qingdujun
 *
 */
public class MainActivity extends Activity {

    LocationManager lm;
    EditText show;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        show = (EditText)findViewById(R.id.show);
        
        //创建LocationManager对象
        lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        //从GPS获取最近的定位信息
        Location lc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        
        //更新显示定位信息
        updateView(lc);
        
        //设置每3秒 获取一次GPS定位信息
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 3000, 8, new LocationListener() {
            
            @Override
            public void onStatusChanged(String provider, int status, Bundle extras) {
                // TODO Auto-generated method stub
                
            }
            
            @Override
            public void onProviderEnabled(String provider) {
                // 当GPS LocationProvider可用时，更新定位
                updateView(lm.getLastKnownLocation(provider));
            }
            
            @Override
            public void onProviderDisabled(String provider) {
                // TODO Auto-generated method stub
                updateView(null);
            }
            
            @Override
            public void onLocationChanged(Location location) {
                // 当GPS定位信息发生改变时，更新定位
                updateView(location);
            }
        });
        
    }
    
    public void updateView(Location newLocation){
        if (newLocation != null) {
            StringBuilder sb = new StringBuilder();
            sb.append("实时位置信息：\n");
            sb.append("经度：\n");
            sb.append(newLocation.getLongitude());
            sb.append("\n纬度：");
            sb.append(newLocation.getLatitude());
            sb.append("\n高度：");
            sb.append(newLocation.getAltitude());
            sb.append("\n速度：");
            sb.append(newLocation.getSpeed());
            sb.append("\n方向：");
            sb.append(newLocation.getBearing());
            sb.append("\n定位精度：");
            sb.append(newLocation.getAccuracy());
            
            show.setText(sb.toString());
        } else {
            show.setText(null);
        }
    }
}

<RelativeLayout 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"
    tools:context="sn.qdj.localgpsdemo.MainActivity" >

    <!-- 显示定位信息 -->
    <EditText
        android:id="@+id/show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:hint="" />

</RelativeLayout>