檢測用戶是否在定位服務中切換為否

Question

如果沒有啟用GPS或網絡，我有一個重定向到設置的代碼。問題是當警報對話框檢測到未啟用GPS時，我想以編程方式強制執行位置服務，或者要檢測用戶在位置服務中選擇的選項，然后重定向回呼叫活動。我還希望每10秒檢查一次位置，直到特定活動開始。請幫助我

我的GPS檢查方法

 public void setGPSLocation()
{
    GPSTracker gps = new GPSTracker(FormBuilderActivity.this);
    // check if GPS enabled
    if(gps.canGetLocation()){
        latitude_loc = gps.getLatitude();
        longitude_loc = gps.getLongitude();

        // \n is for new line
        // Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
    }else{
        latitude_loc = 0.00;
        longitude_loc = 0.00;
        // can't get location
        // GPS or Network is not enabled
        // Ask user to enable GPS/network in settings
        gps.showSettingsAlert();

    }
}

GPSTracker.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
// 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;
}
/**
 * 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 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);
    // Setting Dialog Title
    alertDialog.setTitle("GPS settings");
    // Setting Dialog Message
    alertDialog.setMessage("GPS is not enabled. Please go to settings and switch on the location fetching service");
    // On pressing Settings button
    alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog,int which) {

            //turnGPSOn();

            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            mContext.startActivity(intent);
        }
    });
    // on pressing cancel button
    // Showing Alert Message
    alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
 // TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
  // TODO Auto-generated method stub
}

@Override
public void onProviderEnabled(String provider) {
  // TODO Auto-generated method stub

}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public IBinder onBind(Intent intent) {
  // TODO Auto-generated method stub
    return null;
}

}

Answer 1

試試下面的代碼：

@Override
public void onProviderDisabled(String provider) {

    Toast.makeText(context, "Turn On GPS!", Toast.LENGTH_SHORT).show();
    Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
    startActivityForResult(intent, TURN_ON_GPS_ACTIVITY);
}

在您的onActivityResult中：

case TURN_ON_GPS_ACTIVITY:
            //check gps state
            if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
                //Here : when user comes back from settings without switching on GPS
                // Do as you please, either take them again to settings or show some warning message.

            }

希望這能達到您的目的。