8

对于以下情况,在android中获取当前位置的最佳方法是什么,

  1. 如果 GPS 不可用,请从网络提供商处获取位置

  2. 如果 GPS 可用并且可以获取当前位置,请从 GPS 提供商处获取位置

  3. 如果 GPS 可用但无法获取当前位置(即不断搜索位置),请从网络提供商处获取位置。

    现在,如果 gps 不可用,我可以从网络获取位置,非常感谢满足上述情况的最佳答案。提前致谢。

4

3 回答 3

3

好吧,您可以使用TimerTimerTask类。

LocationManager manager;
TimerTask mTimertask;
GPSLocationListener mGPSLocationListener;
int i = 0; //Here i works as counter;
private static final int MAX_ATTEMPTS = 250;

public void getCurrentLocation() {
    manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    mGPSLocationListener = new GPSLocationListener();

    manager.addGpsStatusListener(mGPSStatusListener);
    mTimerTask = new LocTimerTask(LocationManager.GPS_PROVIDER);

    if (manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
        Log.v(TAG, "GPS ENABLED");
        manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L,
                50.0f, mGPSLocationListener);
    } else {
        turnGPSOn();
        manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000L,
                50.0f, mGPSLocationListener);
    }
    
    if(manager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
        manager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000L,
                50.0f, mNetworkLocationListener);
    }

    if (manager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) {
        Log.v(TAG, "GPS ENABLED");
        manager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
                1000L, 50.0f, mGPSLocationListener);
    }

    myLocTimer = new Timer("LocationRunner", true);
    myLocTimer.schedule(mTimerTask, 0, 500);
}

GPS状态监听器

private GpsStatus.Listener mGPSStatusListener = new GpsStatus.Listener() {

    @Override
    public synchronized void onGpsStatusChanged(int event) {
        switch (event) {
        case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
            Log.v(TAG, "GPS SAtellitestatus");
            GpsStatus status = manager.getGpsStatus(null);
            mSattelites = 0;
            Iterable<GpsSatellite> list = status.getSatellites();
            for (GpsSatellite satellite : list) {
                if (satellite.usedInFix()) {
                    mSattelites++;
                }
            }
            break;

        case GpsStatus.GPS_EVENT_FIRST_FIX:
            /*
             * Toast.makeText(getApplicationContext(), "Got First Fix",
             * Toast.LENGTH_LONG).show();
             */
            break;

        case GpsStatus.GPS_EVENT_STARTED:
            /*
             * Toast.makeText(getApplicationContext(), "GPS Event Started",
             * Toast.LENGTH_LONG).show();
             */
            break;

        case GpsStatus.GPS_EVENT_STOPPED:
            /*
             * Toast.makeText(getApplicationContext(), "GPS Event Stopped",
             * Toast.LENGTH_LONG).show();
             */
            break;
        default:
            break;
        }
    }
};

位置监听器

public class GPSLocationListener implements LocationListener {

    @Override
    public void onLocationChanged(Location argLocation) {
        location = argLocation;
    }

    public void onProviderDisabled(String provider) {

    }

    public void onProviderEnabled(String provider) {

    }

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

    }
}

TimerTask 类

class LocTimerTask extends TimerTask {
    String provider;

    public LocTimerTask(String provider) {
        this.provider = provider;
    }

    final Handler mHandler = new Handler(Looper.getMainLooper());

    Runnable r = new Runnable() {
        @Override
        public void run() {
            i++;
            Log.v(TAG, "Timer Task run" + i);
            location = manager.getLastKnownLocation(provider);

            if (location != null) {
                Log.v(TAG, "in timer task run in if location not null");
                isGPS = true;
                onLocationReceived(location);
                myLocTimer.cancel();
                myLocTimer.purge();
                mTimerTask.cancel();
                return;
            } else {
                Log.v(TAG, "in timer task run in else location null");
                isGPS = false;
                if (location == null && i == MAX_ATTEMPTS) {
                    Log.v(TAG, "if 1 max attempts done");
                    turnGPSOff();
                    location = manager
                            .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                    if (location != null) {
                        Log.v(TAG,
                                "if 1 max attempts done Location from network not null");
                        Log.v(TAG,
                                "if 1 max attempts done Location from network not null coordinates not null");
                        onLocationReceived(location);
                        myLocTimer.cancel();
                        myLocTimer.purge();
                        mTimerTask.cancel();
                        return;
                    }
                } else {
                    return;
                }
            }
            i = 0;
        }
    };

    public void run() {
        mHandler.post(r);
    }
}

此处的计时器已安排为每 500 毫秒运行一次。意味着,每 500 毫秒计时器任务run method将执行一次。在运行方法中,尝试从 GPS 提供商获取特定编号的位置。尝试次数(此处为 MAX_ATTEMPTS)说 5 或 10。如果它在指定的编号内获得位置。如果计数器(Here i)值超过 MAX_ATTEMPTS,则尝试使用该位置,然后从网络提供商获取位置。在获取位置时,我已将该位置传递给回调方法onLocationReceived(Location mLoc),您可以在其中进一步处理位置数据。以下是您将如何使用回调方法:

听众

public interface OnLocationReceivedListener {
public void onLocationReceived(Location mLoc); //callback method which will be defined in your class.

}

你的类应该实现上面定义的监听器。在你的课堂上:

@Override
public void onLocationReceived(Location mLoc) {
    //Do your stuff
}

希望能帮助到你。如果有人有更好的方法,请告诉我。

于 2013-03-27T07:56:00.047 回答
0

班级成员boolean mIsGpsFix

请求 Gps 位置更新并设置倒计时

mCountDown.start();

private CountDownTimer mCountDown = new CountDownTimer(time to wait for Gps fix, same as right)
{

    @Override
    public void onTick(long millisUntilFinished)
    {

    }

    @Override
    public void onFinish()
    {
        // No fix after the desire amount of time collapse
        if (!mIsGpsFix)
        // Register for Network
    }
};
于 2013-03-27T06:44:13.223 回答
0
If GPS is available and can get current location, 

对于上述问题,您可以尝试这样..

使用它,您可以获得当前位置的纬度和经度,然后传递值以获取地图。

public class MyLocationListener implements LocationListener

{

@Override

public void onLocationChanged(Location loc)

{

loc.getLatitude();

loc.getLongitude();

String Text = “My current location is: “ +

“Latitud = “ + loc.getLatitude() +

“Longitud = “ + loc.getLongitude();

Toast.makeText( getApplicationContext(),

Text,

Toast.LENGTH_SHORT).show();

}

@Override

public void onProviderDisabled(String provider)

{

Toast.makeText( getApplicationContext(),

“Gps Disabled”,

Toast.LENGTH_SHORT ).show();

}

@Override

public void onProviderEnabled(String provider)

{

Toast.makeText( getApplicationContext(),

“Gps Enabled”,

Toast.LENGTH_SHORT).show();

}

@Override

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

{

}

}

}
于 2013-03-27T06:31:23.847 回答