解决方案

Question

我正在开发一款GPS应用程序，它在启动时运行良好，但是当我最小化它并打开其他应用程序时，它不会连续给出经度和经度，当我关闭其他应用程序并运行此单个应用程序时，它会给出准确的结果。任何人都有任何想法然后请帮助我..

Answer 1

您应该使用service在后台运行。当你打开其他应用程序时，gps应用程序将以暂停方式消失。然后停止方法。当你重新打开它时，它会调用restart方法。

所以我认为你必须使用gps lat和lng服务。服务将在后台持续运行。

Answer 2

嘛！它只是因为你在后台模式下活动而发生的。当您最小化您的应用程序时，这意味着调用Activity stop（）方法，然后停止您的Activity。

解决方案

对于这种情况，您必须使用此示例

之类的服务

public class LocationService extends Service implements LocationListener{

  //public static final String BROADCAST_ACTION = "Hello World";
    private static final int TWO_MINUTES = 1000 * 60 * 2;
    public LocationManager locationManager;
    public Location previousBestLocation = null;

    Intent intent;
    int counter = 0;

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
      //intent = new Intent(BROADCAST_ACTION);
    }

    @Override
    public void onStart(Intent intent, int startId) {
        // TODO Auto-generated method stub
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 20000, 0, this);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,20000, 0, this);
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    protected boolean isBetterLocation(Location location,Location currentBestLocation) {
        if (currentBestLocation == null) {
            // A new location is always better than no location
            return true;
        }
        // Check whether the new location fix is newer or older
        long timeDelta = location.getTime() - currentBestLocation.getTime();
        boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
        boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
        boolean isNewer = timeDelta > 0;

        // If it's been more than two minutes since the current location, use
        // the new location
        // because the user has likely moved
        if (isSignificantlyNewer) {
            return true;
            // If the new location is more than two minutes older, it must be
            // worse
        } else if (isSignificantlyOlder) {
            return false;
        }

        // Check whether the new location fix is more or less accurate
        int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
        boolean isLessAccurate = accuracyDelta > 0;
        boolean isMoreAccurate = accuracyDelta < 0;
        boolean isSignificantlyLessAccurate = accuracyDelta > 200;

        // Check if the old and new location are from the same provider
        boolean isFromSameProvider = isSameProvider(location.getProvider(),currentBestLocation.getProvider());

        // Determine location quality using a combination of timeliness and
        // accuracy
        if (isMoreAccurate) {
            return true;
        } else if (isNewer && !isLessAccurate) {
            return true;
        } else if (isNewer && !isSignificantlyLessAccurate
                && isFromSameProvider) {
            return true;
        }
        return false;
    }

    /** Checks whether two providers are the same */
    private boolean isSameProvider(String provider1, String provider2) {
        if (provider1 == null) {
            return provider2 == null;
        }
        return provider1.equals(provider2);
    }

    @Override
    public void onDestroy() {
        // handler.removeCallbacks(sendUpdatesToUI);
        super.onDestroy();
        Log.v("STOP_SERVICE", "DONE");
        locationManager.removeUpdates(this);
    }

    public static Thread performOnBackgroundThread(final Runnable runnable) {
        final Thread t = new Thread() {
            @Override
            public void run() {
                try {
                    runnable.run();
                } finally { }
            }
        };
        t.start();
        return t;
    }   

    @Override
    public void onLocationChanged(Location loc) {
        // TODO Auto-generated method stub
        Log.i("***", "Location changed");
        if (isBetterLocation(loc, previousBestLocation)) {
            double latI = loc.getLatitude();
            double longI  = loc.getLongitude();
            //Put Data into shared prefrence
             SharedPreferences sharedPreferences = getSharedPreferences(ApplicationCardinality.PREF_NAME, MODE_PRIVATE);;
             SharedPreferences.Editor editor = sharedPreferences.edit();
             editor.putString("gpsLatitude", ""+latI);
             editor.putString("gpsLongitude", ""+longI);
             editor.commit();
        }
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(), "Gps Enabled",Toast.LENGTH_SHORT).show();
    }

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

}

当它最小化并打开另一个应用程序时中断Android应用程序

2 个答案:

解决方案