Android Intent 启动时获取 GPS

Question

我认为这会非常简单 - 但是这比它应该花费的时间要长。

我只是想获取 GPS 坐标以前往 logcat，就是这样。

意图很好。 "Intent Fired" 消息每次都会出现。应用程序只是拒绝去到位置改变事件。

如果有人可以看一下并让我知道我失败的地方，将不胜感激。

public class MyReceiver extends IntentService implements LocationListener {
private LocationManager locationManager;
public MyReceiver() {
    super("MyReceiver");
}

protected void onHandleIntent(Intent intent) {
    Log.i("DebugMe", "Intent Fired");
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
}
public void onLocationChanged(Location location) {
    String lat = String.valueOf(location.getLatitude());
    String lon = String.valueOf(location.getLongitude());
    Log.i("DebugMe", lat + " " + lon);
    locationManager.removeUpdates(this);
}
public void onProviderDisabled(String provider) {
    Log.d("DebugMe ", "Disabled");
}
public void onProviderEnabled(String provider) {
    Log.d("DebugMe","Enabled");
}
public void onStatusChanged(String provider, int status, Bundle extras) {
    Log.d("DebugMe","Status");
}
}

谢谢

Answer 1

好吧，位置管理器是异步工作的，IntentService 是以这样的方式实现的，当 onHandleIntent(Intent intent) returns 时，服务会自行停止。这意味着它在任何位置可以提供给您的 onLocationChanged(location location) 方法之前就被销毁了。如果你想使用 IntentService 你需要在你有你的位置之前阻止 onHandleIntent(Intent intent) 方法返回，或者使用标准 Service 并在你获得 Location对象。

public class MyReceiver extends Service implements LocationListener {

    private LocationManager locationManager;

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        onHandleIntent(intent);
        return START_NOT_STICKY;
    }

    protected void onHandleIntent(Intent intent) {
        Log.i("DebugMe", "Intent Fired");
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, this);
    }

    public void onLocationChanged(Location location) {
        String lat = String.valueOf(location.getLatitude());
        String lon = String.valueOf(location.getLongitude());
        Log.i("DebugMe", lat + " " + lon);
        locationManager.removeUpdates(this);
        // this is where you stop the service
        stopSelf();
    }

    public void onProviderDisabled(String provider) {
        Log.d("DebugMe ", "Disabled");
    }

    public void onProviderEnabled(String provider) {
        Log.d("DebugMe", "Enabled");
    }

    public void onStatusChanged(String provider, int status, Bundle extras) {
        Log.d("DebugMe", "Status");
    }

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

请记住，此实现不会像 IntentService 那样默认在单独的线程中运行。

Answer 2

你可以使用这个class。

public class GPSTracker extends Service implements LocationListener {

    private final Context mContext;

    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude
    double altitude; // altitude
    public  boolean isLocationAlertShown = true;
    public boolean  comeBackAfterTurnGPSON = false;


    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    public GPSTracker(Context context) {
        this.mContext = context;
        getLocation();
    }

    public Location getLocation() {
        try {
            locationManager = (LocationManager) mContext
                    .getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled

            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);

                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }
    public void Bearing(Location start,Location end)
    {
        start.bearingTo(end);
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }       
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }
    /**
     * Function to get altitude
     * */
    public double getAltitude(){
        if(location != null){
            altitude = location.getAltitude();
        }

        // return latitude
        return altitude;
    }
    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */
    public void showSettingsAlert(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
        alertDialog.setCancelable(true);

        // Setting Dialog Title
        //      alertDialog.

        // Setting Dialog Message
        alertDialog.setMessage("Please Turn on Location Services");

        // On pressing Settings button
        alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
                comeBackAfterTurnGPSON = true;
            }
        });

        // Showing Alert Message
        alertDialog.show();
    }

    @Override
    public void onLocationChanged(Location location) {
        EventBus.getDefault().post(new OnLocationChange(location));
    }

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

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

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

Android Intent 启动时获取 GPS

Get GPS when Android Intent is Started

java

gps

android

location

locationmanager