LocationManagerAndroid上的API似乎对于仅需要偶尔粗略估计用户位置的应用程序来说有点痛苦.
我正在处理的应用程序本身并不是一个位置应用程序,但它确实需要获取用户的位置才能显示附近的商家列表.它不需要担心用户是否在移动或类似的东西.
这是我想做的事情:
ActivityX中需要它时,它将可用.看起来它应该不那么难,但在我看来,我必须启动两个不同的位置提供商(GPS和NETWORK)并管理每个生命周期.不仅如此,我还必须在多个活动中复制相同的代码以满足#2.我曾尝试过使用getBestProvider()过去将解决方案缩减为只使用一个位置提供商,但这似乎只能为您提供最好的"理论"提供商,而不是实际上会给您带来最佳结果的提供商.
有没有更简单的方法来实现这一目标?
我使用以下代码来获取当前位置即(纬度和经度),但我没有获得当前位置(纬度和经度).
谁知道为什么?
package com.ram.currentlocation;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;
public class Location_Gps extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* Use the LocationManager class to obtain GPS locations */
LocationManager mlocManager = (LocationManager)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 …Run Code Online (Sandbox Code Playgroud) android geolocation latitude-longitude google-latitude geocode
我想找到一个Android项目的当前位置.加载应用程序时,我的当前位置始终为null.我已经在清单等中设置了权限.当我找到当前位置时,我打算使用坐标来查找到地图上其他位置的距离.我的代码片段如下.为什么我总是得到一个空值?
locMan = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria crit = new Criteria();
towers = locMan.getBestProvider(crit, false);
location = locMan.getLastKnownLocation(towers);
if (location != null) {
System.out.println("Location is not null!");
lat = (int) (location.getLatitude() *1E6);
longi = (int) (location.getLongitude() * 1E6);
GeoPoint ourLocation = new GeoPoint(lati, longi);
OverlayItem overlayItem = new OverlayItem(ourLocation, "1st String",
"2nd String");
CustomPinpoint custom = new CustomPinpoint(d, MainMap.this);
custom.insertPinpoint(overlayItem);
overlayList.add(custom);
overlayList.clear();
} else {
System.out.println("Location is null! " + towers);
Toast.makeText(MainMap.this, "Couldn't get provider",Toast.LENGTH_SHORT)
.show();
}
Run Code Online (Sandbox Code Playgroud) 我想找到我在android应用程序中当前位置的纬度和经度.它不是在位置上更改.我获得了纬度和经度值而位置Changed.but我需要当前位置的纬度和经度.如何做到这一点?
我想找到我当前位置的经度和纬度,但我一直得到NULL.
double lat = loc.getLatitude(); //Cause the result is null, so can't know longitude and latitude
double lng = loc.getLongitude();
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
String provider = LocationManager.GPS_PROVIDER;
Location location = locationManager.getLastKnownLocation(provider); //result is null!
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这是获取GPS状态的代码.它工作正常:
public void onGpsStatusChanged(int event) { // get the GPS statue
LocationManager locationManager = (LocationManager) GpsActivity.this.getSystemService(Context.LOCATION_SERVICE);
GpsStatus status = locationManager.getGpsStatus(null);
String satelliteInfo = updateGpsStatus(event, status);
myTextView.setText(satelliteInfo);//work fine ,searched satellite:16
}
};
private String updateGpsStatus(int event, GpsStatus status) {
StringBuilder sb2 = new …Run Code Online (Sandbox Code Playgroud) 这是我用来获取当前位置的代码:
mgr = (LocationManager) getSystemService(LOCATION_SERVICE);
Criteria criteria = new Criteria();
best = mgr.getBestProvider(criteria, true);
if (best == null) {
//ask user to enable atleast one of the Location Providers
} else {
Location location = mgr.getLastKnownLocation(best);
//But sometimes it returns null
}
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几乎每次都有 best = network
但它有时并没有提供这个位置.
mgr.getLastKnownLocation(best) returns null
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也:
onResume() {
mgr.requestLocationUpdates(best, 15000, 10, this);
}
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和
onPause() {
mgr.removeUpdates(this);
}
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这种情况有替代方案吗?
一种选择可能是
List<String> providers = mgr.getAllProviders();
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存储所有提供商并逐步减少1.但从未在任何地方看到过此推荐.此外,要求最好的提供者是文档建议的.