安卓GPS定位不工作？

Question

我是 android 开发新手，我尝试了 2 个教程来获取当前位置，但它们都不适合我。我得到了确切的预期布局，但没有显示位置，它似乎完全空白，好像设置文本字段的命令不存在一样。 logcat 没有显示任何异常，这就是我没有发布它的原因。其他一切看起来都很正常。 我认为这可能与从 android 6.0 开始必须实时运行的权限有关，但是我尝试过的本教程处理了这个问题，除了缺少权限不会引发安全异常吗？ 以下是我完全按照原样遵循的两个教程：

http://demonuts.com/2016/12/30/get-current-location-android-studio/

http://www.viralandroid.com/2015/12/how-to-get-current-gps-location-programmatically-in-android.html

Answer 1

要使用地图，您需要将 google_maps_key 放入 values 文件夹下的 google_maps_api.xml。您可以在 google api manager 中获取此密钥。

Answer 2

我使用设备内部的谷歌地图，通过意图传递纬度和经度，然后单击一个按钮。

String uri = "geo:0,0?q="+ gps.getLatitude() + "," + gps.getLongitude() ;                
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setData(Uri.parse(uri));
            if (intent.resolveActivity(getPackageManager()) != null) {
                startActivity(intent);
            }

我创建了一个类 TrackGPS 来帮助我获取电线。

    public class TrackGPS extends Service implements LocationListener {


    private final Context mContext;


    boolean checkGPS = false;


    boolean checkNetwork = false;

    boolean canGetLocation = false;

    Location loc;
    double latitude;
    double longitude;


    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10;


    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1;
    protected LocationManager locationManager;

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

    private Location getLocation() {

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

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

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

            if (!checkGPS && !checkNetwork) {
                Toast.makeText(mContext, "No Service Provider Available", Toast.LENGTH_SHORT).show();
            } else {
                this.canGetLocation = true;
                // First get location from Network Provider
                if (checkNetwork) {
//                    Toast.makeText(mContext, "Network", Toast.LENGTH_SHORT).show();

                    try {
                        locationManager.requestLocationUpdates(
                                LocationManager.NETWORK_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
//                        Log.d("Network", "Network");
                        if (locationManager != null) {
                            loc = locationManager
                                    .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                        }

                        if (loc != null) {
                            latitude = loc.getLatitude();
                            longitude = loc.getLongitude();
                        }
                    } catch (SecurityException e) {

                    }
                }
            }
            // if GPS Enabled get lat/long using GPS Services
            if (checkGPS) {
//                Toast.makeText(mContext, "GPS", Toast.LENGTH_SHORT).show();
                if (loc == null) {
                    try {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
//                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            loc = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (loc != null) {
                                latitude = loc.getLatitude();
                                longitude = loc.getLongitude();
                            }
                        }
                    } catch (SecurityException e) {

                    }
                }
            }

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

        return loc;
    }

    public double getLongitude() {
        if (loc != null) {
            longitude = loc.getLongitude();
        }
        return longitude;
    }

    public double getLatitude() {
        if (loc != null) {
            latitude = loc.getLatitude();
        }
        return latitude;
    }

    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    public void showSettingsAlert() {
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);

        alertDialog.setTitle("GPS Not Enabled");

        alertDialog.setMessage("Do you wants to turn On GPS");

        alertDialog.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                mContext.startActivity(intent);
            }
        });


        alertDialog.setNegativeButton("No", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });


        alertDialog.show();
    }


//    public void stopUsingGPS() {
//        if (locationManager != null) {
//
//
//            locationManager.removeUpdates(TrackGPS.this);
//        }
//    }

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

    @Override
    public void onLocationChanged(Location location) {

    }

    @Override
    public void onStatusChanged(String s, int i, Bundle bundle) {

    }

    @Override
    public void onProviderEnabled(String s) {

    }

    @Override
    public void onProviderDisabled(String s) {

    }


}

别忘了申请 GPS 权限。