android - 纬度不显示android

Question

我只是想调试并确保我得到正确的经度和纬度信息。使用 TextView 显示经纬度时，经度显示正确，但无论我使用 NETWORK_PROVIDER 还是 GPS_PROVIDER，纬度始终为 0.0。这是个常见的问题吗？我将纬度视为经度，所以我不清楚为什么它不起作用。提前感谢您的帮助。

这是我的位置代码，以防万一(注意变量名):

TextView textLat;
TextView textLong;
TextView textSpeed;

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_display_navigation);

    textLat = (TextView) findViewById(R.id.textLat);
    textLong = (TextView) findViewById(R.id.textLong);
    textSpeed = (TextView) findViewById(R.id.speed_lol);

    LocationManager bubbleButt = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
    LocationListener bbListener = new mylocationlistener();

    Location lastLocation = bubbleButt.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

    if (lastLocation != null)
    {
        textLat.setText(Double.toString(lastLocation.getLatitude()));
        textLong.setText(Double.toString(lastLocation.getLongitude()));
    }
    bubbleButt.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, bbListener);
}

    class mylocationlistener implements LocationListener{

        @Override
        public void onLocationChanged(Location location) {
            if(location != null)
            {
                double pLong = location.getLongitude();
                double pLat = location.getLatitude();
                double stupid = location.getSpeed();

                textLat.setText(Double.toString(pLat));
                textLong.setText(Double.toString(pLong));
                textLat.setText(Double.toString(stupid));
            }

Answer 1

首先要使用此代码获取设备当前位置。

package com.deals;

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.provider.Settings;
import android.util.Log;

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;
            // 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;
}

}

这个代码把主要 Activity 放在创建方法上

gps = new GPSTracker(getActivity());

    if (gps.canGetLocation()) {

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

        // Toast.makeText(
        // getApplicationContext(),
        // "Your Location is - \nLat: " + latitude + "\nLong: "
        // + longitude, Toast.LENGTH_LONG).show();
    } else {
        gps.showSettingsAlert();
    }

    Log.e("latlong", "" + latitude + "" + longitude);