[Android] 取得GPS或網路提供之座標

取得座標的方法有兩種
1、從GPS來
2、從WIFI資訊來

首先，先在 AndroidManifest加入下面兩個權限

//宣告Application會使用取得座標資料 FIN為gps，COARSE為wifi
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

在你想要取得的Activity 先 implements LocationListener 必且加入下面Function

private LocationManager lms;
 private String bestProvider = LocationManager.GPS_PROVIDER;
 private boolean getGPSService;
 /**
  * 啟用定位模組，使用後記得關閉
  * @return Location
  */
 public Location locationServiceInitial() {
  /* 取得系統定位服務 */
  LocationManager status = (LocationManager) (this.getSystemService(Context.LOCATION_SERVICE));
  
  /* 確認是否開啟GPS服務or網路定位服務 */
  if (status.isProviderEnabled(LocationManager.GPS_PROVIDER) || status.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
   getGPSService=true;
   lms = (LocationManager) getSystemService(LOCATION_SERVICE); // 取得系統定位服務
   Criteria criteria = new Criteria(); // 資訊提供者選取標準
   bestProvider = lms.getBestProvider(criteria, true);
   Location location = lms.getLastKnownLocation(bestProvider); // 使用GPS定位座標
   
   if(location != null){
             return location;
         }else{
             Toast.makeText(this, "無法定位座標", Toast.LENGTH_LONG).show();
             return null;
         }
  } else {
   Toast.makeText(this, "請開啟定位服務", Toast.LENGTH_LONG).show();
   // 開啟設定畫面
   startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));
   return null;
  } 
 }

重新進入時更新、離開時要關閉

@Override
 @Override
 protected void onResume() {
  // TODO Auto-generated method stub
  super.onResume();
  if (getGPSService) {
   // 服務提供者、更新頻率毫秒、最短距離、地點改變時呼叫物件
   lms.requestLocationUpdates(bestProvider, 1000, 1, (LocationListener) this);
  }
 }

 @Override
 protected void onPause() {
  // TODO Auto-generated method stub
  super.onPause();
  if (getGPSService) {
   lms.removeUpdates((LocationListener) this); // 離開頁面時停止更新
   getGPSService = false;
  }
 }