Question

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    db = new DbAdapter(getBaseContext());
    db.open();

    android_id = Secure.getString(getBaseContext().getContentResolver(), Secure.ANDROID_ID);
    locmgr = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Toast.makeText(getBaseContext(), "Waiting for location..." , Toast.LENGTH_SHORT).show();
}

  LocationListener onLocationChange=new LocationListener() {
        public void onLocationChanged(Location loc) {
            //sets and displays the lat/long when a location is provided
            String latlong = "Lat: " + loc.getLatitude() + " Long: " + loc.getLongitude();  
            Toast.makeText(getBaseContext(), latlong, Toast.LENGTH_SHORT).show();
                 db.insertGPSCoordinates(android_id, Double.toString(loc.getLatitude()), Double.toString(loc.getLongitude()));
        } 

        public void onProviderDisabled(String provider) {
        // required for interface, not used
        }

        public void onProviderEnabled(String provider) {
        // required for interface, not used
        }

        public void onStatusChanged(String provider, int status,
        Bundle extras) {
        // required for interface, not used
        }
    };
    //pauses listener while app is inactive
    @Override
    public void onPause() {
        super.onPause();
        locmgr.removeUpdates(onLocationChange);
    }

    //reactivates listener when app is resumed
    @Override
    public void onResume() {
        super.onResume();
        locmgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,10000.0f,onLocationChange);
    }

这段代码对我有用，但它只获得Lats and Longs一次。我想知道“LocationListener”是如何工作的？我启动了应用程序并散步，它只存储了1套。我做错了什么......

Answer 1

您可以将GPS物品放入计时器线程中以强制它更新。不同的设备与GPS监听器的行为不同。

另外，请确保您的insertDBCoordinates不是每次都只是对同一行进行更新

Answer 2

public void requestLocationUpdates (String provider, long minTime, float minDistance, LocationListener listener)

当您的位置差异为10000米，10公里时，您的应用程序将仅更新位置更改。试试：

locmgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,onLocationChange);

Android存储GPS Lat和Longs

2 个答案: