android - 无法使用 GPS 获取位置

Question

我正在开发一个应用程序。其中，我需要获取用户的当前位置。我正在使用网络获取当前位置，但是当我启动 GPS 时，它没有显示当前位置。可能是什么问题？

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

        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setAltitudeRequired(false);
        criteria.setBearingRequired(false);
        criteria.setCostAllowed(true);
        criteria.setPowerRequirement(Criteria.NO_REQUIREMENT);

        String bestProvider = locationManager.getBestProvider(criteria, true);

        System.out.println("Best Provider:"+bestProvider);

        // 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
            Toast.makeText(mContext, "GPS and Network not enabled!", Toast.LENGTH_SHORT).show();
        } else {
            this.canGetLocation = true;
            if (isNetworkEnabled) {
                locationManager.requestLocationUpdates(
                        //LocationManager.NETWORK_PROVIDER,
                        bestProvider,
                        MIN_TIME_BW_UPDATES,
                        MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                Log.d("Network", "Network");
                if (locationManager != null) {
                    location = locationManager
                            //.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                            .getLastKnownLocation(bestProvider);
                    if (location != null) {
                        startLatitude = location.getLatitude();
                        startLongitude = location.getLongitude();

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

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

    return location;
}

我已添加权限:

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />

Answer 1

google 在他们最近的 Google IO 2013 Activity 中发布了一个不错的 API:

https://developers.google.com/events/io/sessions/324498944

您应该检查一下，看看如何最小化您的代码。

请注意，它需要设备具有 Play 商店应用程序才能运行。

与使用普通位置传感器相比，此方法具有许多优势(电池、速度、精度...)。