Question

很抱歉有一个愚蠢的问题，但是从最近两天开始，我发现出租车应用位置更新的最佳方法

任何帮助都随处可见，谢谢

我想要最后位置当前的经度

我正在使用LocationManager库来实现这一目标

Answer 1

您可以使用此类获取当前或最近的位置 如果当前位置当前不可用。

通过致电

开始此活动

startActivity(new Intent(getApplicationContext(), LocationFinder.class));
finish();

现在，您只需致电->就可以在任何其他活动中获取位置信息 LocationFinder.finalAddress

需要位置权限

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

LocationFinder.java

import android.annotation.SuppressLint;
import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

import java.io.IOException;
import java.util.List;
import java.util.Locale;


@SuppressLint("MissingPermission")
public class LocationFinder extends AppCompatActivity implements LocationListener {

    private LocationManager locationManager;
    private String provider;
    public static String finalAddress;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        getLoc();
    }

    public  void getLoc() {

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        Criteria criteria = new Criteria();
        provider = locationManager.getBestProvider(criteria, true);

        Location location = locationManager.getLastKnownLocation(provider);
        if (location == null) {
            location = getLastKnownLocation();
        }

        if (location != null) {
            System.out.println("Provider " + provider + " has been selected.");
            onLocationChanged(location);
        } else {
            Toast.makeText(this, "Location not available...", Toast.LENGTH_SHORT).show();
        }

    }
    private Location getLastKnownLocation() {
        List<String> providers = locationManager.getProviders(true);
        Location bestLocation = null;
        for (String provider : providers) {
            @SuppressLint("MissingPermission")
            Location l = locationManager.getLastKnownLocation(provider);

            if (l == null) {
                continue;
            }
            if (bestLocation == null
                    || l.getAccuracy() < bestLocation.getAccuracy()) {
                bestLocation = l;
            }
        }
        if (bestLocation == null) {
            return null;
        }
        return bestLocation;
    }

    @Override
    protected void onResume() {
        super.onResume();
        locationManager.requestLocationUpdates(provider, 400, 1, this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        locationManager.removeUpdates(this);
    }

    @Override
    public void onLocationChanged(Location location) {
        //You had this as int. It is advised to have Lat/Loing as double.
        double lat = location.getLatitude();
        double lng = location.getLongitude();

        Geocoder geoCoder = new Geocoder(this, Locale.getDefault());
        StringBuilder builder = new StringBuilder();
        try {
            List<Address> address = geoCoder.getFromLocation(lat, lng, 1);
            int maxLines = address.get(0).getMaxAddressLineIndex()+1;
            for (int i=0; i<maxLines; i++) {
                String addressStr = address.get(0).getAddressLine(i);
                builder.append(addressStr);
                builder.append(" ");
            }
            finalAddress = builder.toString(); //This is the complete address.
        } catch (IOException | NullPointerException e) {
            // Handle IOException
        }
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {


    }

    @Override
    public void onProviderEnabled(String provider) {
        Toast.makeText(this, "Enabled new provider " + provider,
                Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onProviderDisabled(String provider) {
        Toast.makeText(this, "Disabled provider " + provider,
                Toast.LENGTH_SHORT).show();
    }

}

对于当前位置更新，找到好的方法或库

1 个答案: