Question

我正在尝试开发一个Android应用程序，使用GPS或网络提供程序获取设备的经度和经度，无论哪个可用于该过程。当设备的GPS开启时，代码可以正常工作，但不幸的是，当设备的GPS关闭时，它无法正常工作。

我想根据可用的提供商获取设备的纬度和经度，例如;如果设备的GPS打开，它应该使用GPS提供商获得设备的纬度和经度，如果GPS关闭，它应该使用网络提供商获得设备的经度和纬度。在我的情况下，网络提供商总是返回false并且仅在设备的GPS开启的情况下工作，因为它不应该打扰设备GPS打开或关闭它应该只是基于网络提供商得到纬度和经度。

我使用了谷歌的融合API，但即便如此也有问题，我只能使用GPS提供商获得经纬度，当我关闭设备的GPS时，它永远不会使用网络提供商返回所需的纬度和经度，因为当设备的GPS关闭时，网络提供商和GPS提供商都返回错误。

GPS和网络提供商都在使用设备的GPS，我想分别将他们的流程分开。

我正在使用以下权限和功能

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.LOCATION_HARDWARE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-feature android:name="android.hardware.location" android:required="true"/>
<uses-feature android:name="android.hardware.location.network" android:required="true"/>
<uses-feature android:name="android.hardware.location.gps" android:required="true"/>

以下是我的完整Java代码，仅在GPS和网络情况下启用设备的GPS时才有效。

package com.example.administrator.locationgetter;

import android.Manifest;
import android.app.Activity;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends Activity {
    public static final int MY_PERMISSIONS_REQUEST = 0;

    LocationManager locationManager;

    private LocationListener mLocationListener;


    private void showStatus(String st)
    {
        Toast.makeText(MainActivity.this,st,Toast.LENGTH_SHORT).show();
    }
    private LocationListener createLocationListener() {
        return new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                // Called when a new location is found by the network location provider.
                Toast.makeText(MainActivity.this,"accuracy: " + location.getAccuracy() + " lat: " + location.getLatitude() + " lon: " + location.getLongitude(),Toast.LENGTH_SHORT).show();
            }

            public void onStatusChanged(String provider, int status, Bundle extras) {
                showStatus(provider + " -- " + status);
            }

            public void onProviderEnabled(String provider) {
                showStatus(provider + " -- " + "ENABLED!");
            }

            public void onProviderDisabled(String provider) {
                showStatus(provider + " -- " + "DISABLED!");
            }


        };
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        //setSupportActionBar(toolbar);

        mLocationListener = createLocationListener();
        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode,
        String permissions[], int[] grantResults) {
        switch (requestCode) {
            case MY_PERMISSIONS_REQUEST: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    locationManager = (LocationManager) this.getSystemService(LOCATION_SERVICE);
                    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationListener);

                } else {
                    Toast.makeText(MainActivity.this, "So sad! Give me the damn permissions!", Toast.LENGTH_SHORT).show();

                }
                return;
            }
        }
    }

    public void btnLocation(View v) {

        if ((ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) || (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED )){
            showStatus("Give me the permissions man!");
            ActivityCompat.requestPermissions(this,
                    new String[]{ Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION},
                    MY_PERMISSIONS_REQUEST);
        }
        else
        {
            showStatus("Already have permission");
            locationManager = (LocationManager) this.getSystemService(LOCATION_SERVICE);
            String locationProvider = LocationManager.NETWORK_PROVIDER;
            Location location = locationManager.getLastKnownLocation(locationProvider);
            if(location != null)
            {
                Toast.makeText(MainActivity.this,"accuracy: " + location.getAccuracy() + " lat: " + location.getLatitude() + " lon: " + location.getLongitude(),Toast.LENGTH_SHORT).show();
            }
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationListener);

        }
    }
    public void btnLocation1(View v) {

        if ((ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) || (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED )){
            showStatus("Give me the permissions man!");
            ActivityCompat.requestPermissions(this,
                    new String[]{ Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION},
                    MY_PERMISSIONS_REQUEST);
        }
        else
        {
            showStatus("Already have permission");
            locationManager = (LocationManager) this.getSystemService(LOCATION_SERVICE);
            String locationProvider = LocationManager.GPS_PROVIDER;
            Location location = locationManager.getLastKnownLocation(locationProvider);
            if(location != null)
            {
                Toast.makeText(MainActivity.this,"accuracy: " + location.getAccuracy() + " lat: " + location.getLatitude() + " lon: " + location.getLongitude(),Toast.LENGTH_SHORT).show();
            }
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, mLocationListener);

        }
    }
}

我在KitKat，Lollipop和Marshmallow上测试了这个应用程序，都有相同的结果。

[更新] 如果您下载百度地图并启动应用程序，它将要求您授予位置访问权限，只需确保您的位置已关闭，只需将位置权限授予百度地图，您将注意到它将指向您的位置即使您的GPS或位置服务已关闭，百度也会映射。

Answer 1

除非您打开位置服务，否则无法获取位置。下方屏幕显示可以设置的各种位置模式。应选择这些模式中的任何一种来获取位置。根据所选模式，各种LocationProviders可用于获取位置

因此，仅在High accuracy或Battery saving模式下，网络提供商才可用

要在gps关闭时获取位置更新，您可以使用LocationManager.PASSIVE_PROVIDER。其详尽的详细信息here

即使位置已关闭，您也可以使用Google Play服务中的LocationServices获取上次已知位置。请参阅this

网络提供商和GPS提供商一起工作，需要根据可用的提供商

1 个答案: