Question

我的应用程序使用alertdialog调用gps位置并在edittext中存储数据。按下按钮确定坐标存储在列表视图中。

public void addCoor(View view) {
    // creating the EditText widget programatically
    final EditText editTextLat = new EditText(com.example.bo.datatest.InsertRilev.this);
    final EditText editTextLong = new EditText(com.example.bo.datatest.InsertRilev.this);
    String posizione = "";
    double latitude = 0;
    double longitude = 0;
    gps = new GPSTracker(com.example.bo.datatest.InsertRilev.this);

    // check if GPS enabled
    if (gps.canGetLocation()) {

        latitude = gps.getLatitude();
        longitude = gps.getLongitude();

        // \n is for new line
        // posizione= "nLat: " + latitude + "Long: " + longitude;
    } else {
        // can't get location
        // GPS or Network is not enabled
        // Ask user to enable GPS/network in settings
        gps.showSettingsAlert();
    }
    editTextLat.setText(Double.toString(latitude));
    editTextLong.setText(Double.toString(longitude));
    // create the AlertDialog as final
    //Context context = com.example.bo.datatest.InsertRilev.getContext();
    LinearLayout layout = new LinearLayout(com.example.bo.datatest.InsertRilev.this);
    layout.setOrientation(LinearLayout.VERTICAL);
    final AlertDialog dialog = new AlertDialog.Builder(com.example.bo.datatest.InsertRilev.this)
            .setTitle("Rilevamento delle posizione attuale ")
            .setMessage("Coordinate attuali: ")

                    // Set the action buttons
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    // Coordinate coo = new Coordinate(Float.valueOf(editTextLat.getText().toString()),Float.valueOf(editTextLong.getText().toString()),  ril_id);
                    // coo_id = db.addCoordinate(coo);
                    //dati =new String[] {editTextLat.getText().toString() +"," + editTextLong.getText().toString()};
                    arrayList.add(editTextLat.getText().toString() + "," + editTextLong.getText().toString());
                    // next thing you have to do is check if your adapter has changed
                    adapter = new ArrayAdapter<String>(com.example.bo.datatest.InsertRilev.this, android.R.layout.simple_list_item_1, arrayList);
                    ((BaseAdapter) adapter).notifyDataSetChanged();

                    cooview.setAdapter(adapter);

                }


            })

            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int id) {
                    // removes the AlertDialog in the screen
                }
            })
            .create();
    layout.addView(editTextLat);

    layout.addView(editTextLong);


    dialog.setView(layout);
    dialog.show();
    //chiudo il dialog e richiamo la funzione per scrivere la posizione rilevata
    dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {

        @Override
        public void onDismiss(DialogInterface dialog) {
            enableButton();
        }
    });

}

对于返回gps坐标，我使用类gpsTracker

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);*/
        isNetworkEnabled = false;

        if (!isGPSEnabled && !isNetworkEnabled) {
            // no network provider is enabled
        } else {
            this.canGetLocation = true;
            // First get location from Network Provider
            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 is settings");

    // Setting Dialog Message
    alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");

    // 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);
        }
    });

    // on pressing cancel button
    alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
        }
    });

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

@Override
public void onLocationChanged(Location 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;
}

我第一次调用对话框时坐标是正确的，但在我改变物理位置后我重新打开对话框，坐标与第一次相同，就像缓存一样。

Answer 1

将MIN_TIME_BW_UPDATES最小化1分钟为0

Answer 2

尝试将日志放入onLocationChanged（）函数中，因为它是针对位置更改触发的日志。在此函数中作为参数传递的Location对象具有所有新的位置值。

android gps位置不要改变坐标

2 个答案: