Android Query - 检测位置
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【中文标题】Android Query - 检测位置【英文标题】：Android Query - detecting location 【发布时间】：2014-03-19 21:54:10 【问题描述】：我正在使用 android Query 来检测用户的位置。
由于某种原因，当我尝试检索我的纬度和经度时，它会显示我之前的位置，该位置在几百米之外，就好像它被缓存了一样。
这可能是什么问题？
public class LocationHelper
private Context mContext;
private double latitude;
private double longitude;
public LocationHelper(Context mContext)
this.mContext = mContext;
location_ajax();
public double getLatitude()
return latitude;
public double getLongitude()
return longitude;
private void location_ajax()
// Get the location
LocationAjaxCallback cb = new LocationAjaxCallback();
cb.weakHandler(this, "locationCb");
cb.async(mContext);
public void locationCb(String url, Location loc, AjaxStatus status)
if (loc != null)
//Toast.makeText(mContext, loc.toString(), Toast.LENGTH_LONG).show();
this.latitude = loc.getLatitude();
this.longitude = loc.getLongitude();
else
Toast.makeText(mContext, mContext.getString(R.string.msg_could_not_retrieve_location), Toast.LENGTH_LONG).show();
Logcat：
03-19 23:03:17.146: W/AQuery(29954): reporting:java.lang.reflect.InvocationTargetException
03-19 23:03:17.146: W/AQuery(29954): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 23:03:17.146: W/AQuery(29954): at java.lang.reflect.Method.invoke(Method.java:511)
03-19 23:03:17.146: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeMethod(AQUtility.java:206)
03-19 23:03:17.146: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeHandler(AQUtility.java:183)
03-19 23:03:17.146: W/AQuery(29954): at com.androidquery.callback.AbstractAjaxCallback.callback(AbstractAjaxCallback.java:577)
03-19 23:03:17.146: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.failure(LocationAjaxCallback.java:192)
03-19 23:03:17.146: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.access$3(LocationAjaxCallback.java:183)
03-19 23:03:17.146: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback$Listener.run(LocationAjaxCallback.java:308)
03-19 23:03:17.146: W/AQuery(29954): at java.util.Timer$TimerImpl.run(Timer.java:284)
03-19 23:03:17.146: W/AQuery(29954): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-19 23:03:17.146: W/AQuery(29954): at android.os.Handler.<init>(Handler.java:121)
03-19 23:03:17.146: W/AQuery(29954): at android.widget.Toast$TN.<init>(Toast.java:361)
03-19 23:03:17.146: W/AQuery(29954): at android.widget.Toast.<init>(Toast.java:97)
03-19 23:03:17.146: W/AQuery(29954): at android.widget.Toast.makeText(Toast.java:254)
03-19 23:03:17.146: W/AQuery(29954): at uk.ac.gla.project.helpers.LocationHelper.locationCb(LocationHelper.java:46)
03-19 23:03:17.146: W/AQuery(29954): ... 9 more
03-19 23:03:20.001: W/AQuery(29954): reporting:java.lang.reflect.InvocationTargetException
03-19 23:03:20.001: W/AQuery(29954): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 23:03:20.001: W/AQuery(29954): at java.lang.reflect.Method.invoke(Method.java:511)
03-19 23:03:20.001: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeMethod(AQUtility.java:206)
03-19 23:03:20.001: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeHandler(AQUtility.java:183)
03-19 23:03:20.001: W/AQuery(29954): at com.androidquery.callback.AbstractAjaxCallback.callback(AbstractAjaxCallback.java:577)
03-19 23:03:20.001: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.failure(LocationAjaxCallback.java:192)
03-19 23:03:20.001: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.access$3(LocationAjaxCallback.java:183)
03-19 23:03:20.001: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback$Listener.run(LocationAjaxCallback.java:308)
03-19 23:03:20.001: W/AQuery(29954): at java.util.Timer$TimerImpl.run(Timer.java:284)
03-19 23:03:20.001: W/AQuery(29954): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-19 23:03:20.001: W/AQuery(29954): at android.os.Handler.<init>(Handler.java:121)
03-19 23:03:20.001: W/AQuery(29954): at android.widget.Toast$TN.<init>(Toast.java:361)
03-19 23:03:20.001: W/AQuery(29954): at android.widget.Toast.<init>(Toast.java:97)
03-19 23:03:20.001: W/AQuery(29954): at android.widget.Toast.makeText(Toast.java:254)
03-19 23:03:20.001: W/AQuery(29954): at uk.ac.gla.project.helpers.LocationHelper.locationCb(LocationHelper.java:46)
03-19 23:03:20.001: W/AQuery(29954): ... 9 more
03-19 23:03:20.671: W/AQuery(29954): reporting:java.lang.reflect.InvocationTargetException
03-19 23:03:20.671: W/AQuery(29954): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 23:03:20.671: W/AQuery(29954): at java.lang.reflect.Method.invoke(Method.java:511)
03-19 23:03:20.671: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeMethod(AQUtility.java:206)
03-19 23:03:20.671: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeHandler(AQUtility.java:183)
03-19 23:03:20.671: W/AQuery(29954): at com.androidquery.callback.AbstractAjaxCallback.callback(AbstractAjaxCallback.java:577)
03-19 23:03:20.671: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.failure(LocationAjaxCallback.java:192)
03-19 23:03:20.671: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.access$3(LocationAjaxCallback.java:183)
03-19 23:03:20.671: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback$Listener.run(LocationAjaxCallback.java:308)
03-19 23:03:20.671: W/AQuery(29954): at java.util.Timer$TimerImpl.run(Timer.java:284)
03-19 23:03:20.671: W/AQuery(29954): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-19 23:03:20.671: W/AQuery(29954): at android.os.Handler.<init>(Handler.java:121)
03-19 23:03:20.671: W/AQuery(29954): at android.widget.Toast$TN.<init>(Toast.java:361)
03-19 23:03:20.671: W/AQuery(29954): at android.widget.Toast.<init>(Toast.java:97)
03-19 23:03:20.671: W/AQuery(29954): at android.widget.Toast.makeText(Toast.java:254)
03-19 23:03:20.671: W/AQuery(29954): at uk.ac.gla.project.helpers.LocationHelper.locationCb(LocationHelper.java:46)
03-19 23:03:20.671: W/AQuery(29954): ... 9 more
03-19 23:03:20.906: W/AQuery(29954): reporting:java.lang.reflect.InvocationTargetException
03-19 23:03:20.906: W/AQuery(29954): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 23:03:20.906: W/AQuery(29954): at java.lang.reflect.Method.invoke(Method.java:511)
03-19 23:03:20.906: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeMethod(AQUtility.java:206)
03-19 23:03:20.906: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeHandler(AQUtility.java:183)
03-19 23:03:20.906: W/AQuery(29954): at com.androidquery.callback.AbstractAjaxCallback.callback(AbstractAjaxCallback.java:577)
03-19 23:03:20.906: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.failure(LocationAjaxCallback.java:192)
03-19 23:03:20.906: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.access$3(LocationAjaxCallback.java:183)
03-19 23:03:20.906: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback$Listener.run(LocationAjaxCallback.java:308)
03-19 23:03:20.906: W/AQuery(29954): at java.util.Timer$TimerImpl.run(Timer.java:284)
03-19 23:03:20.906: W/AQuery(29954): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-19 23:03:20.906: W/AQuery(29954): at android.os.Handler.<init>(Handler.java:121)
03-19 23:03:20.906: W/AQuery(29954): at android.widget.Toast$TN.<init>(Toast.java:361)
03-19 23:03:20.906: W/AQuery(29954): at android.widget.Toast.<init>(Toast.java:97)
03-19 23:03:20.906: W/AQuery(29954): at android.widget.Toast.makeText(Toast.java:254)
03-19 23:03:20.906: W/AQuery(29954): at uk.ac.gla.project.helpers.LocationHelper.locationCb(LocationHelper.java:46)
03-19 23:03:20.906: W/AQuery(29954): ... 9 more
03-19 23:03:21.061: W/AQuery(29954): reporting:java.lang.reflect.InvocationTargetException
03-19 23:03:21.061: W/AQuery(29954): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 23:03:21.061: W/AQuery(29954): at java.lang.reflect.Method.invoke(Method.java:511)
03-19 23:03:21.061: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeMethod(AQUtility.java:206)
03-19 23:03:21.061: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeHandler(AQUtility.java:183)
03-19 23:03:21.061: W/AQuery(29954): at com.androidquery.callback.AbstractAjaxCallback.callback(AbstractAjaxCallback.java:577)
03-19 23:03:21.061: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.failure(LocationAjaxCallback.java:192)
03-19 23:03:21.061: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.access$3(LocationAjaxCallback.java:183)
03-19 23:03:21.061: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback$Listener.run(LocationAjaxCallback.java:308)
03-19 23:03:21.061: W/AQuery(29954): at java.util.Timer$TimerImpl.run(Timer.java:284)
03-19 23:03:21.061: W/AQuery(29954): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-19 23:03:21.061: W/AQuery(29954): at android.os.Handler.<init>(Handler.java:121)
03-19 23:03:21.061: W/AQuery(29954): at android.widget.Toast$TN.<init>(Toast.java:361)
03-19 23:03:21.061: W/AQuery(29954): at android.widget.Toast.<init>(Toast.java:97)
03-19 23:03:21.061: W/AQuery(29954): at android.widget.Toast.makeText(Toast.java:254)
03-19 23:03:21.061: W/AQuery(29954): at uk.ac.gla.project.helpers.LocationHelper.locationCb(LocationHelper.java:46)
03-19 23:03:21.061: W/AQuery(29954): ... 9 more
03-19 23:03:21.486: W/AQuery(29954): reporting:java.lang.reflect.InvocationTargetException
03-19 23:03:21.486: W/AQuery(29954): at java.lang.reflect.Method.invokeNative(Native Method)
03-19 23:03:21.486: W/AQuery(29954): at java.lang.reflect.Method.invoke(Method.java:511)
03-19 23:03:21.486: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeMethod(AQUtility.java:206)
03-19 23:03:21.486: W/AQuery(29954): at com.androidquery.util.AQUtility.invokeHandler(AQUtility.java:183)
03-19 23:03:21.486: W/AQuery(29954): at com.androidquery.callback.AbstractAjaxCallback.callback(AbstractAjaxCallback.java:577)
03-19 23:03:21.486: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.failure(LocationAjaxCallback.java:192)
03-19 23:03:21.486: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback.access$3(LocationAjaxCallback.java:183)
03-19 23:03:21.486: W/AQuery(29954): at com.androidquery.callback.LocationAjaxCallback$Listener.run(LocationAjaxCallback.java:308)
03-19 23:03:21.486: W/AQuery(29954): at java.util.Timer$TimerImpl.run(Timer.java:284)
03-19 23:03:21.486: W/AQuery(29954): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
03-19 23:03:21.486: W/AQuery(29954): at android.os.Handler.<init>(Handler.java:121)
03-19 23:03:21.486: W/AQuery(29954): at android.widget.Toast$TN.<init>(Toast.java:361)
03-19 23:03:21.486: W/AQuery(29954): at android.widget.Toast.<init>(Toast.java:97)
03-19 23:03:21.486: W/AQuery(29954): at android.widget.Toast.makeText(Toast.java:254)
03-19 23:03:21.486: W/AQuery(29954): at uk.ac.gla.project.helpers.LocationHelper.locationCb(LocationHelper.java:46)
有可靠的替代品吗？
【问题讨论】：
您使用的是哪个 AQuery 版本？我的意思是位置调用处于测试模式还是在该库中处于稳定模式？ 【参考方案1】：为什么这么复杂？使用Google Play Services。它们是免费的，使用复杂的Location Strategies
【讨论】：
【参考方案2】：根据您的 logCat，当您的 LocationAjaxCallback$Listener 触发并调用此方法时，您会遇到 RuntimeException。
locationCb(String url, Location loc, AjaxStatus status)
因为它无法更新您的变量
private double latitude;
private double longitude;
您将返回之前存储在其中的任何内容。 （您的旧位置）
您需要修复导致此错误的任何原因
at com.androidquery.callback.LocationAjaxCallback$Listener.run(LocationAjaxCallback.java:308)
at java.util.Timer$TimerImpl.run(Timer.java:284)
Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
之后，您的更新方法将正确触发并更新纬度和经度
【讨论】：
【参考方案3】：为什么不是经典的：
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Define a listener that responds to location updates
locationListener = new LocationListener()
public void onLocationChanged(Location location)
// Called when a new location is found by the network location provider.
longitude = String.valueOf(location.getLongitude());
latitude = String.valueOf(location.getLatitude());
Log.d(TAG, "changed Loc : " + longitude + ":" + latitude);
public void onStatusChanged(String provider, int status, Bundle extras)
public void onProviderEnabled(String provider)
public void onProviderDisabled(String provider)
;
// getting GPS status
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// check if GPS enabled
if (isGPSEnabled)
Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null)
longitude = String.valueOf(location.getLongitude());
latitude = String.valueOf(location.getLatitude());
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
else
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null)
longitude = String.valueOf(location.getLongitude());
latitude = String.valueOf(location.getLatitude());
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
else
longitude = "0.00";
latitude = "0.00";
取自这里http://androidadvance.com/android_snippets.php
【讨论】：
【参考方案4】：在cb.async(mContext);之前添加cb.uiCallback(true);
为什么
我可以告诉你，从没有 Looper 的后台线程创建 LocationHelper 的实例，因此你不能使用它来获取异步回调。
基本上，如果您想在不调用 cb.uiCallback(true); 的情况下调用 cb.async(mContext);，则必须从 UI 线程*
* 或具有Looper 的任何其他线程
【讨论】：
add cb.uiCallback(true); before cb.async(mContext); - 这不起作用【参考方案5】：
Try this one.
package com.example.tracker;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;
public class MainActivity extends FragmentActivity implements LocationListener
private GoogleMap map;
private static final LatLng ROMA = new LatLng(42.093230818037,
11.7971813678741);
private LocationManager locationManager;
private String provider;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
map = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
boolean enabledGPS = service
.isProviderEnabled(LocationManager.GPS_PROVIDER);
boolean enabledWiFi = service
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
// Check if enabled and if not send user to the GSP settings
// Better solution would be to display a dialog and suggesting to
// go to the settings
if (!enabledGPS)
Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG)
.show();
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(intent);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the locatioin provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null)
Toast.makeText(this, "Selected Provider " + provider,
Toast.LENGTH_SHORT).show();
onLocationChanged(location);
else
// do something
/* Request updates at startup */
@Override
protected void onResume()
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
/* Remove the locationlistener updates when Activity is paused */
@Override
protected void onPause()
super.onPause();
locationManager.removeUpdates(this);
@Override
public void onLocationChanged(Location location)
double lat = location.getLatitude();
double lng = location.getLongitude();
Toast.makeText(this, "Location " + lat + "," + lng, Toast.LENGTH_LONG)
.show();
LatLng coordinate = new LatLng(lat, lng);
Toast.makeText(this,
"Location " + coordinate.latitude + "," + coordinate.longitude,
Toast.LENGTH_LONG).show();
Marker startPerc = map.addMarker(new MarkerOptions()
.position(coordinate)
.title("Start")
.snippet("Inizio del percorso")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
@Override
public void onProviderDisabled(String provider)
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
@Override
public void onProviderEnabled(String provider)
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
// TODO Auto-generated method stub
【讨论】：
【参考方案6】：@Override
public void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Intent intent=new Intent("android.location.GPS_ENABLED_CHANGE");
intent.putExtra("enabled", true);
sendBroadcast(intent);
LocationManager mlocManager = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);
/* Class My Location Listener */
public class MyLocationListener implements LocationListener
@Override
public void onLocationChanged(Location loc)
try
lat=loc.getLatitude();
longs=loc.getLongitude();
getAddress(lat, longs);
String Text = "My current location is: " +
"Latitud = " + loc.getLatitude() +
"Longitud = " + loc.getLongitude();
catch (NullPointerException e)
// Toast.makeText( getActivity().getApplicationContext(), Text, Toast.LENGTH_SHORT).show();
@Override
public void onProviderDisabled(String provider)
Toast.makeText(getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT ).show();
@Override
public void onProviderEnabled(String provider)
Toast.makeText(getApplicationContext(), "Gps Enabled", Toast.LENGTH_SHORT).show();
@Override
public void onStatusChanged(String provider, int status, Bundle extras)
【讨论】：
【参考方案7】：下一个错误表明您已经启动了一个将接收异步消息的处理程序。要做到这一点，你需要在主线程上，或者你可以启动一个 looper：
无法在未调用的线程内创建处理程序 Looper.prepare()
我认为关键是您正在创建一个 AJAX 处理程序，它似乎期望来自 GeoLoc API 的一些异步消息。
您可以尝试在 Activity 中实例化此处理程序或尝试启动 Looper：
Looper.prepare();
LocationAjaxCallback cb = new LocationAjaxCallback();
Looper.loop();
如果您启动 Looper，请小心，完成后需要将其关闭。认为 Looper 就像在其当前线程中运行的侦听器（因此它不会在调用线程中运行）并且它有一个内部队列来存储新消息。 每当有新消息到达时，队列就会更新，并且 Looper 线程会处理此事件（当它完成当前事件时，会接收下一个事件或阻塞直到有新消息到达）。
因此，您应该启动 looper（创建一个将处理消息的新线程）并在完成时关闭（释放该线程 + 消息队列）。
【讨论】：
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