Android | Google地圖獲取當前位置和更新

Question

我想在地圖上獲取當前位置並在移動時更新它。 每當更新發生時，我想獲得當前的longtidude和latitute值以用於其他方法。

private LocationRequest request = LocationRequest.create().setInterval(50000);

我想我必須使用LocationRequest 。 我創建了一個每5分鍾更新一次位置的對象。 但現在我不知道如何使用它。 我在互聯網上查了教程，但對於初學者來說它們是如此復雜。 有人有簡單的解決方案嗎？

編輯

這就是我的代碼現在的樣子：

public class MainActivity extends Activity implements LocationListener {

private GoogleMap map;
public double latitude;
public double longitude;
private LocationManager locationManager;
private Context mContext;
private android.location.LocationListener locationListener;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ;

    map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
    map.setMyLocationEnabled(true);


    getLocation();
    Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}


@Override
public void onLocationChanged(Location location) {

    if (location != null) {

        longitude = location.getLongitude();

        latitude = location.getLatitude();


        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

    }

}

public void getLocation()
{

    locationManager = (LocationManager) mContext.getSystemService(LOCATION_SERVICE);

}

}

當我嘗試測試時，我的應用程序停止了工作。 由於這是我的第一個Android應用程序，我不是很擅長，我找不到什么錯。

Answer 1

對於位置使用這個

locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

// Define a listener that responds to location updates

locationListener = new LocationListener() {

        public void onLocationChanged(Location location) {

                // Called when a new location is found by the network location provider.

                longitude = String.valueOf(location.getLongitude());

                latitude = String.valueOf(location.getLatitude());

                Log.d(TAG, "changed Loc : " + longitude + ":" + latitude);

        }

        public void onStatusChanged(String provider, int status, Bundle extras) {

        }

        public void onProviderEnabled(String provider) {

        }

        public void onProviderDisabled(String provider) {

        }

};

// getting GPS status

isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

// check if GPS enabled

if (isGPSEnabled) {

        Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

        if (location != null) {

                longitude = String.valueOf(location.getLongitude());

                latitude = String.valueOf(location.getLatitude());

                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);

        } else {

                location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                if (location != null) {

                        longitude = String.valueOf(location.getLongitude());

                        latitude = String.valueOf(location.getLatitude());

                        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);

                } else {

                        longitude = "0.00";

                        latitude = "0.00";

                }

        }

}

來自http://androidadvance.com/android_snippets.php#h.r43fot3suy6h

Answer 2

使用gps確定位置（longtidude和latitute值）並將其傳遞給地圖

this mainactivity.java for gps 

public class GpsBasicsAndroidExample extends Activity implements LocationListener {

private LocationManager locationManager;
TextView text;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_gps_basics_android_example);
    text=(TextView)findViewById(R.id.tv1);

    /********** get Gps location service LocationManager object ***********/
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

    /*
      Parameters :
         First(provider)    :  the name of the provider with which to register 
         Second(minTime)    :  the minimum time interval for notifications, in milliseconds. This field is only used as a hint to conserve power, and actual time between location updates may be greater or lesser than this value. 
         Third(minDistance) :  the minimum distance interval for notifications, in meters 
         Fourth(listener)   :  a {#link LocationListener} whose onLocationChanged(Location) method will be called for each location update 
    */

    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,1,10, this);

    /********* After registration onLocationChanged method called periodically after each 3 sec ***********/
}

/************* Called after each 3 sec **********/
@Override
public void onLocationChanged(Location location) {

    String str = "Latitude: "+location.getLatitude()+" \nLongitude: "+location.getLongitude();
    //Toast.makeText(getBaseContext(), str, Toast.LENGTH_LONG).show();
    text.setText(str);
}

@Override
public void onProviderDisabled(String provider) {

    /******** Called when User off Gps *********/

    Toast.makeText(getBaseContext(), "Gps turned off ", Toast.LENGTH_LONG).show();
}

@Override
public void onProviderEnabled(String provider) {

    /******** Called when User on Gps  *********/

    Toast.makeText(getBaseContext(), "Gps turned on ", Toast.LENGTH_LONG).show();
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    // TODO Auto-generated method stub

}

}

這對於地圖

main.java

enter code here

公共類MainActivity擴展FragmentActivity {

GoogleMap mMap;
@Override

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
    mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
    final LatLng CIU = new LatLng(35.21843892856462, 33.41662287712097);
    Marker ciu = mMap.addMarker(new MarkerOptions()
                              .position(CIU).title("My Office"));


    final LatLng CIU1 = new LatLng(30.21843892856462, 33.41662287712097);
    Marker ciu1 = mMap.addMarker(new MarkerOptions()
                              .position(CIU1).title("My Second Office"));

    final LatLng CIU2 = new LatLng(30.21843892856462, 30.41662287712097);
    Marker ciu2 = mMap.addMarker(new MarkerOptions()
                              .position(CIU2).title("My thired Office"));



}

}

Answer 3

這是你可以做的。 我會盡量讓你變得簡單：

• 使用implements關鍵字將LocationListener接口添加到擴展活動類。 這將強制您覆蓋查找當前位置所需的一些方法。

   public class A extends Activity implements LocationListener {} 

• 創建一個Location Manager類的實例，它將作為一個鈎子來調用Location包中的各種服務和方法。

   private LocationManager locationManager; 

• 創建一個類似getLocation（）的方法，並從Location Manger實例調用預定義的服務方法。

   locationManager = (LocationManager) mContext .getSystemService(LOCATION_SERVICE); 

• 在onLocationChanged（）方法中，您可以使用getLongitude（）使用getLongitude（）使用這兩個方法（位置管理器類的一部分）請求緯度。

• 將這些方法獲得的兩個值存儲在兩個單獨的變量中，確保它們是Double類型，稍后您可以將它們轉換為String類型，然后在應用程序活動的Text視圖中顯示它們。

   if (location != null) { longitude = String.valueOf(location.getLongitude()); latitude = String.valueOf(location.getLatitude()); locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener); } 

• 調用onCreate（）中的getLocation（）方法，並通過TextView或Toast在應用程序屏幕上顯示它們。

   Toast.makeText(getApplicationContext(), "Your Location is - \\nLat: " + latitude + "\\nLong: " + longitude, Toast.LENGTH_LONG).show(); 

• 最后但並非最不要忘記在Manifest文件中添加權限。

   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.INTERNET" /> 

更多詳情請參閱此鏈接 。