android GPS定位 实例

package xhs.getlocation; 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.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class MainActivity extends Activity { /** Called when the activity is first created. */ LocationManager locationManager; private EditText editText; Button btnGetLocation; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnGetLocation=(Button)findViewById(R.id.btnGetLocation); editText = (EditText)findViewById(R.id.speed); editText.setText("Location:\n"); btnGetLocation.setOnClickListener(new bntOnClickListen()); //通过getSystemService接口获取LocationManager实例 locationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE); //实现监听器 LocationListener LocationListener locationlisten=new LocationListener() { public void onStatusChanged(String arg0, int arg1, Bundle arg2) { // TODO Auto-generated method stub // Provider的状态在可用、暂时不可用和无服务三个状态直接切换时触发此函数 } public void onProviderEnabled(String arg0) { // TODO Auto-generated method stub // Provider被enable时触发此函数，比如GPS被打开 } public void onProviderDisabled(String arg0) { // TODO Auto-generated method stub // Provider被disable时触发此函数，比如GPS被关闭 } //当坐标改变时触发此函数；如果Provider传进相同的坐标，它就不会被触发 @Override public void onLocationChanged(Location arg0) { // TODO Auto-generated method stub if (arg0 != null) { Log.i("log", "Location changed : Lat: " + arg0.getLatitude() + " Lng: " + arg0.getLongitude()); editText.setText("Lat:"+arg0.getLatitude() + " \nLng: " + arg0.getLongitude() + "\n"); } else { Log.i("log", "Location changed : Lat: " + "NULL" + " Lng: " + "NULL"); editText.setText("NULL" + " Lng: " + "NULL" + "\n"); } } }; // 注册监听器 locationListener //第 2 、 3个参数可以控制接收GPS消息的频度以节省电力。第 2个参数为毫秒， 表示调用 listener的周期，第 3个参数为米 ,表示位置移动指定距离后就调用 listener locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, locationlisten); } class bntOnClickListen implements OnClickListener{ @Override public void onClick(View v) { // TODO Auto-generated method stub //获取地理位置信息数据（如果没实现监听器和注册监听器，好像获取不了地理数据） Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); if (location!=null) { String strLati = Double.toString(location.getLatitude()); //经度 String strLong = Double.toString(location.getLongitude()); //纬度 //显示地理位置数据 System.out.println("---------地理位置信息---------"); System.out.println("---------" + strLati + "/" + strLong + "---------"); editText.setText(strLati + "/" + strLong + "\n"); } else{ Log.i("log", "location==NULL"); editText.setText("location==NULL"); } } } }