Android调用系统功能获取当前经纬度

package com.example.locationtest;import java.util.List;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.view.Menu;import android.view.MenuItem;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {    private TextView positionTextView;//用来显示当前位置信息    private LocationManager locationmanager;//位置管理器    private String provider;//用GPS还是网络来定位    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        positionTextView = (TextView) findViewById(R.id.position_text_view);        locationmanager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);        List providerList = locationmanager.getProviders(true);        if(providerList.contains(LocationManager.GPS_PROVIDER)){            provider = LocationManager.GPS_PROVIDER;            //如果是用GPS来定位        }        else if(providerList.contains(LocationManager.NETWORK_PROVIDER)){            provider = LocationManager.NETWORK_PROVIDER;            //如果是用网络来定位        }        else{            Toast.makeText(this, "No location provider to use", Toast.LENGTH_SHORT).show();            //无可用定位工具            return;        }        Location location = locationmanager.getLastKnownLocation(provider);        //得到最近位置        if(location!=null){            showLocation(location);//位置存在则显示位置        }        locationmanager.requestLocationUpdates(provider, 5000, 10, locationListener);//位置更新器，侦听每5S/10M的位置改变    }@Overrideprotected void onDestroy() {    // TODO Auto-generated method stub    super.onDestroy();    if(locationmanager!=null){        locationmanager.removeUpdates(locationListener);    }}LocationListener locationListener = new LocationListener() {    @Override    public void onStatusChanged(String provider, int status, Bundle extras) {        // TODO Auto-generated method stub    }    @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) {        // TODO Auto-generated method stub        showLocation(location);    }};    private void showLocation(Location location){        String currentPosition = "latitude is"+location.getLatitude()+"\n"//经度                +"longitude is"+location.getLongitude()+"\n"+//纬度                 "altitude is" + location.getAltitude()//海拔                ;        positionTextView.setText(currentPosition);    }}
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