我试图获取当前位置的纬度和经度。 但是，当我使用下面的代码时，根本不会触发位置监听器。 我在清单文件中添加了LOCATION权限。
任何人都可以提供帮助吗？
这是java代码：
package com.example.setlocaction;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.widget.Toast;
public class MainActivity extends Activity{
double latitude, longitude, radius;
LocationManager mlocManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Acquire a reference to the system Location Manager
mlocManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
// Define a listener that responds to location updates
LocationListener locationListener = new LocationListener()
{
public void onLocationChanged(Location loc)
{
// Called when a new location is found by the network location provider.
Log.i("loc","location changed");
if (loc!=null)
{
loc.getLatitude();
loc.getLongitude();
String Text = "My current location is: " +
"Latitud =" + loc.getLatitude() +
"Longitud = " + loc.getLongitude();
Toast.makeText( getApplicationContext(),Text,Toast.LENGTH_SHORT).show();
}
}
public void onStatusChanged(String provider, int status, Bundle extras)
{}
public void onProviderEnabled(String provider)
{}
public void onProviderDisabled(String provider)
{}
};
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
// 高精度
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = mlocManager.getBestProvider(criteria, true);
mlocManager.requestLocationUpdates(provider, 2000, 0, locationListener);
Location loc=mlocManager.getLastKnownLocation(provider);
if (loc==null)
{
Log.i("loc","loc=null");
}
}
}
mafinest：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.setlocaction"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RESTART_PACKAGES" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.setlocaction.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
答案 0 :(得分：1)
首先，您当前的解决方案使用“getLastKnownLocation”，这意味着，如果您实际检索经度和纬度，您无法确定它是否会返回当前位置用户。它只返回最后找到的位置，可以在几英里之外。
这样做没有错，但它留下了不确定性。
相反，我亲自为检索用户的当前位置实施了一个位置管理器，利用以下帖子中提供的代码非常有效：
https://stackoverflow.com/a/17290348/2399772
通过使用此特定代码，您还将获得优势，即它首先尝试利用WiFi连接来确定稍微好一点的位置。它不起作用，它将使用GPS代替。此外，如果未启用GPS服务，将显示一个对话框，告知用户启用这些服务。
希望这有帮助。
附加说明 正如我在上一篇文章中所说，Geolocation API will does unfortunately not work on all devices。您可以考虑使用反向地理编码API，这样更可靠：
https://developers.google.com/maps/documentation/geocoding/
它只需要您发送一个应包含纬度和经度的HTTP请求，然后它将在JSON中提供一个易于解析的响应。
答案 1 :(得分：0)
如果您以前没有使用GPS，有时需要一段时间才能传送第一个位置。此外，请确保您所在的位置可以进行gps更新，或者通过telnet使用地理位置修复模拟器。
答案 2 :(得分：0)
试试这个
public class MyLocationActivity extends Activity implements LocationListener {
private LocationManager mgr;
private String best;
public static double myLocationLatitude;
public static double myLocationLongitude;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mgr = (LocationManager) getSystemService(LOCATION_SERVICE);
dumpProviders();
Criteria criteria = new Criteria();
best = mgr.getBestProvider(criteria, true);
Log.d("best provider", best);
Location location = mgr.getLastKnownLocation(best);
dumpLocation(location);
//may be some intent here
}
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
dumpLocation(location);
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
protected void onPause() {
super.onPause();
mgr.removeUpdates(this);
}
@Override
protected void onResume() {
super.onResume();
mgr.requestLocationUpdates(best, 15000, 1, this);
}
private void dumpLocation(Location l) {
if (l == null) {
myLocationLatitude = 0.0;
myLocationLongitude = 0.0;
} else {
myLocationLatitude = l.getLatitude();
myLocationLongitude = l.getLongitude();
}
}
private void dumpProviders() {
List<String> providers = mgr.getAllProviders();
for (String p : providers) {
dumpProviders(p);
}
}
private void dumpProviders(String s) {
LocationProvider info = mgr.getProvider(s);
StringBuilder builder = new StringBuilder();
builder.append("name: ").append(info.getName());
}
}
答案 3 :(得分：0)
将以下代码添加到您的java文件
private void GetLocation()
{
LocationDetail pref_LocationDetail = new LocationDetail(_context);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if(objCommon.isOnline(_context))
{
if(locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER))
{
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER ,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
new MyLocationListener()
);
return ;
}
else if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
{
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER ,
MINIMUM_TIME_BETWEEN_UPDATES,
MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
new MyLocationListener()
);
return ;
}
}
}
private class MyLocationListener implements LocationListener
{
public void onLocationChanged(Location location)
{
LocationDetail pref_LocationDetail = new LocationDetail(_context);
double Lattitude = location.getLatitude();
double Longitude = location.getLongitude();
Toast.makeText(_context , location.getProvider().toString() , Toast.LENGTH_LONG).show();
locationManager.removeUpdates(this);
locationManager = null;
}
public void onStatusChanged(String s, int i, Bundle b) {
Toast.makeText(_context , "Provider status changed",
Toast.LENGTH_LONG).show();
}
public void onProviderDisabled(String s) {
Toast.makeText(_context ,
"Provider disabled by the user. GPS turned off",
Toast.LENGTH_LONG).show();
}
public void onProviderEnabled(String s) {
Toast.makeText(_context ,
"Provider enabled by the user. GPS turned on",
Toast.LENGTH_LONG).show();
}
}
只需在清单
中添加以下代码即可 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />