无法获取经纬度

Question

我正在尝试获取位置信息。我需要经度和纬度。

我正在使用我的 phone 到运行并进行调试。它是 4.4.2.

我的 AndroidManifest 文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.peylx.brstpcu.voteapp">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".HomeActivity"
            android:label="@string/title_activity_home"
            android:theme="@style/AppTheme.NoActionBar"></activity>
    </application>

</manifest>

我的Activity

package com.peylx.brstpcu.voteapp;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.media.audiofx.BassBoost;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.NonNull;
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.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;


public class HomeActivity extends AppCompatActivity {


    private LocationManager locationManager;
    private LocationListener locationListener;
    private double latitude;
    private double longitude;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);



        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        locationListener = new LocationListener() {
            @Override
            public void onLocationChanged(Location location) {
                latitude = location.getLatitude();
                longitude = location.getLongitude();
                Toast.makeText(getApplicationContext(),"Latitude = " + Double.toString(latitude) + "Longitude = " + Double.toString(longitude),Toast.LENGTH_LONG).show();
            }

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

            }

            @Override
            public void onProviderEnabled(String provider) {

            }

            @Override
            public void onProviderDisabled(String provider) {
                Intent settingsIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                startActivity(settingsIntent);
            }
        };
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

                requestPermissions(new String[]{
                        Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.INTERNET
                }, 10);

                return;
            }
        } else {
            configureButton();
        }

    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode){
            case 10:
                if (grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
                    configureButton();
                return;
        }

    }

    private void configureButton(){
                locationManager.requestLocationUpdates("gps", 5000, 0, locationListener);

    }
}

当我尝试调试我的程序时，它没有执行 onLocationChanged() 方法。所以我无法收到 Toast 消息。

如何解决这个问题？

Answer 1

试试这个 -

1) 在您的 HomeActivity 中实现 OnMyLocationChangeListener。

2) 复制如下。方法-

private Location getMyLocation() {
        LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        Location myLocation = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);


        // if Location wasn't found
        if (myLocation == null) {
            Criteria criteria = new Criteria();
            criteria.setAccuracy(Criteria.ACCURACY_COARSE);

            String provider = lm.getBestProvider(criteria, true);
            // Use the provider to get the last known location
            myLocation = lm.getLastKnownLocation(provider);
            double lat1 = myLocation.getLatitude();
            double lng1 = myLocation.getLongitude();
            Toast.makeText(HomeActivity.this,"Latitude = " + lat1 + "Longitude = " + lng1,Toast.LENGTH_LONG).show();
        }

        return myLocation;
    }

3) 在 onCreate() 中调用 getMyLocation() 方法

对我有用:)

注意： OnMyLocationChangeListener 已弃用（请查看 google 文档）

Answer 2

试试下面的代码：

从 OnCreate() 方法调用 checkLocation() 方法：

// ********************************************************************************
    public void checkLocation(Activity activity) {
        locationManager = (LocationManager) activity.getSystemService(Context.LOCATION_SERVICE);
        Criteria c = new Criteria();
        provider = locationManager.getBestProvider(c, false);

        location = getLocation(activity);
        List<String> providers = locationManager.getProviders(true);

    for (String provider : providers) {
        Location l = locationManager.getLastKnownLocation(provider);
        Log.d("Location provider", "Location provider : " + l + "locationManager" + locationManager);
        if (l == null) {

            continue;
        } else {
            location = l;
            break;

        }

    }
        locationManager.requestLocationUpdates(provider, 400, 1, this);
        locationManager.removeUpdates(this);

        if (location != null) {
            // get latitude and longitude of the location
            onLocationChanged(location);
            // display on text view

        } else {
            // Toaster.showToast(this,
            // getResources().getString(R.string.NoConnection));
            Log.d("cahngeLag", "Lat: " + lat + "lng" + lng + "location" + location);
        }
    }

    // ===============================GetLatLang============================
    public Location getLocation(Activity activity) {
        try {
            locationManager = (LocationManager) activity.getSystemService(Context.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 {
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 400, 0, this);
                    Log.d("Network", "Network Enabled");
                    if (locationManager != null) {
                        location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            lat = location.getLatitude();
                            lng = location.getLongitude();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 400, 0, this);
                        Log.d("GPS", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                lat = location.getLatitude();
                                lng = location.getLongitude();
                            }
                        }
                    }
                }
            }

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

        return location;
    }

    @Override
    public void onLocationChanged(Location location) {
        lat = location.getLatitude();
        lng = location.getLongitude();
    }

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

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }

Answer 3

首先你的 activity 应该实现 LocationListener

public class HomeActivity extends AppCompatActivity implements LocationListener{


private LocationManager locationManager;
private LocationListener locationListener;
private double latitude;
private double longitude;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);



    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    locationListener = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
            latitude = location.getLatitude();
            longitude = location.getLongitude();
            Toast.makeText(getApplicationContext(),"Latitude = " + Double.toString(latitude) + "Longitude = " + Double.toString(longitude),Toast.LENGTH_LONG).show();
        }

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

        }

        @Override
        public void onProviderEnabled(String provider) {

        }

        @Override
        public void onProviderDisabled(String provider) {
            Intent settingsIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivity(settingsIntent);
        }
    };
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {

            requestPermissions(new String[]{
                    Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.INTERNET
            }, 10);

            return;
        }
    } else {
        configureButton();
    }

}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode){
        case 10:
            if (grantResults.length>0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
                configureButton();
            return;
    }

}

private void configureButton(){
            locationManager.requestLocationUpdates("gps", 5000, 0, locationListener);

    }
}

无法获取经纬度

Can not get Latitude and Longitude

java

android

location