Android Location在GPS中的应用(二)

package com.example.location;import java.util.List;import java.util.Locale;import android.location.Address;import android.location.Criteria;import android.location.Geocoder;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;import android.os.IBinder;import android.provider.Settings;import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.ServiceConnection;import android.graphics.Color;import android.view.Menu;import android.view.MenuItem;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {private LocationManager locationManager;private String provider;private Location location;private Address address;private TextView textview;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);getProvider();openGPS();// 获取位置location = locationManager.getLastKnownLocation(provider);// 显示位置信息updateWithNewLocation(location);// 注册监听器locationListener,locationManager.requestLocationUpdates(provider, 2000, 10,locationListener);}private void openGPS() {if (locationManager.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)|| locationManager.isProviderEnabled(android.location.LocationManager.NETWORK_PROVIDER)) {Toast.makeText(this, "位置源已设置", Toast.LENGTH_SHORT).show();return;}Toast.makeText(this, "位置源未设置！", Toast.LENGTH_SHORT).show();Intent intent = new Intent(Settings.ACTION_SECURITY_SETTINGS);startActivityForResult(intent, 0);}private void getProvider() {// 构建查询条件Criteria criteria = new Criteria();// 查询精度：高criteria.setAccuracy(Criteria.ACCURACY_FINE);// 是否查询海拔：是criteria.setAltitudeRequired(true);// 是否查询方位角：是criteria.setBearingRequired(true);// 是否付费：是criteria.setCostAllowed(true);// 电量要求：低criteria.setPowerRequirement(Criteria.POWER_LOW);// 返回最合适的符合条件的provider，第二个参数为true说明如果只有一个provider是有效地，则返回当前provider；provider = locationManager.getBestProvider(criteria, true);}// GPS消息监听器private final LocationListener locationListener = new LocationListener() {// 位置发生改变后调用public void onLocationChanged(Location location) {updateWithNewLocation(location);}// provider被用户关闭后调用public void onProviderDisabled(String provider) {updateWithNewLocation(null);}// provider被用户开启后调用public void onProviderEnabled(String provider) {}// provider状态变化时调用public void onStatusChanged(String provider, int status, Bundle extras) {}};// GPS监听器调用，处理位置信息private void updateWithNewLocation(Location location) {String latLongString;TextView myLocationText = (TextView) findViewById(R.id.textview);String string = "GPS 信息详情：";myLocationText.setTextColor(Color.RED);myLocationText.setTextSize(20);if (location != null) {double lat = location.getLatitude();double lng = location.getLongitude();latLongString = "纬度" + lat + "/n经度" + lng;} else {latLongString = "无法获取地理信息";}myLocationText.setText(string + "/n" + "您当前的位置：/n" + latLongString+ "/n" + getAddressbyGeoPoint(location));}// 获取地址信息private List<Address> getAddressbyGeoPoint(Location location) {List<Address> result = null;try {if (location != null) {// 获取Geocoder，通过Geocoder就可以拿到地址Geocoder gc = new Geocoder(this, Locale.getDefault());result = gc.getFromLocation(location.getLatitude(),location.getLongitude(), 1);}} catch (Exception e) {e.printStackTrace();}return result;}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main, menu);super.onCreateOptionsMenu(menu);menu.add(0, Menu.FIRST + 1, 1, "打开GPS");menu.add(0, Menu.FIRST + 2, 2, "关闭GPS");return true;}public boolean onOptionsItemSelected(MenuItem item) {Intent i;super.onOptionsItemSelected(item);switch(item.getItemId()) {case Menu.FIRST + 1;this.setTitle("GPS Started");i = new Intent(this,GpsService.class);this.bindService(i, connection, Context.BIND_AUTO_CREATE);break;case Menu.FIRST+2;this.setTitle("GPS Stopped");if ( mBinder != null ){ i = new Intent( this , GpsService. class ); this .unbindService( connection ); mBinder=null;//释放mBinder,防止重复解绑定}break;    }return true;    }ServiceConnection connection = new ServiceConnection() {public void onServiceConnected(ComponentName arg0, IBinder agr1) {mBinder = (IGpsBinder) arg1;if (mBinder != null) {mBinderbindService(main.this);}}public void onServiceDisconnected(ComponentName name) {}};}