Jquery 正在检索上次已知的地理位置-Phonegap
下面的代码Jquery 正在检索上次已知的地理位置-Phonegap,jquery,android,iphone,html,geolocation,Jquery,Android,Iphone,Html,Geolocation,下面的代码 navigator.geolocation.getCurrentPosition(getGeo_Success, getGeo_Fail, { enableHighAccuracy : true, maximumAge : Infinity, timeout : 15000 }); 检索当前GPS位置-但是-必须有有效的GPS信号(当然,设备的GPS功能应该打开) 如果我们查看其他应用程序(比如Android设备上的地图)——它知道如何检索上次已知的位置——
navigator.geolocation.getCurrentPosition(getGeo_Success, getGeo_Fail, {
enableHighAccuracy : true,
maximumAge : Infinity,
timeout : 15000
});
检索当前GPS位置-但是-必须有有效的GPS信号(当然,设备的GPS功能应该打开)
如果我们查看其他应用程序(比如Android设备上的地图)——它知道如何检索上次已知的位置——即使我在打开地图之前没有使用更新地理位置的应用程序——它会在地图上显示我的位置,即使我在没有GPS信号的建筑物内
我只是想澄清一下:我对我的应用程序检索到的最后一个地理位置不感兴趣,因为在下一次启动它时,这个地理位置可能无关紧要
问题是:我们如何通过HTML5/Phonegap实现这一点?似乎是
navigator。地理位置只知道检索当前位置,即使maximumAge
设置为Infinity
(这意味着最后一个缓存位置的年龄无关,所以任何命中都可以(或者应该是!)我在getGeo\u Success
函数调用setLocation中建议([u位置]
要将其存储在本地存储上
您可以假设每个使用phoneGap的设备都已经实现了本地存储。
这样,你总是在那里有有效的位置。然后只要在你需要的时候弹出它
function getLocation() {
return JSON.parse(localStorage.getItem('location'));
}
function setLocation(location) {
localStorage.setItem('vibesList', JSON.stringify(vibes));
}
编辑:如果你想检索设备知道的最新位置(不是应用程序),你必须通过后台过程从设备中提取当前数据。这是一种有问题的方法,因为:
并非所有的设备都允许这样做
您必须编写自己的本机自定义来连接
电话差距
ANDROID解决方案(iPhone解决方案如下):
public class App extends DroidGap {
// Hold a private member of the class that calls LocationManager
private GetNativeLocation gLocation;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// This line is important, as System Services are not available
// prior to initialization
super.init();
gLocation = new GetNativeLocation(this, appView);
// Add the interface so we can invoke the java functions from our .js
appView.addJavascriptInterface(gLocation, "NativeLocation");
try {
super.loadUrl("file:///android_asset/www/index.html");
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
}
}
这很好:
我使用了Android自带的LocationManager
,它提供了一个getLastKnownLocation
函数——名字说明了一切
这是相关代码
1) 将以下java类添加到应用程序中
package your.package.app.app;
import org.apache.cordova.DroidGap;
import android.content.Context;
import android.location.*;
import android.os.Bundle;
import android.webkit.WebView;
public class GetNativeLocation implements LocationListener {
private WebView mAppView;
private DroidGap mGap;
private Location mostRecentLocation;
public GetNativeLocation(DroidGap gap, WebView view) {
mAppView = view;
mGap = gap;
}
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
getLocation();
}
public void getLocation() {
LocationManager lm =
(LocationManager)mGap.
getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
String provider = lm.getBestProvider(criteria, true);
lm.requestLocationUpdates(provider, 1000, 500, this);
mostRecentLocation = lm
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
}
public void doInit(){
getLocation();
}
public double getLat(){ return mostRecentLocation.getLatitude();}
public double getLong() { return mostRecentLocation.getLongitude(); }
public void onProviderDisabled(String arg0) {
// 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
}
}
2) 确保您的主类如下所示:
public class App extends DroidGap {
// Hold a private member of the class that calls LocationManager
private GetNativeLocation gLocation;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// This line is important, as System Services are not available
// prior to initialization
super.init();
gLocation = new GetNativeLocation(this, appView);
// Add the interface so we can invoke the java functions from our .js
appView.addJavascriptInterface(gLocation, "NativeLocation");
try {
super.loadUrl("file:///android_asset/www/index.html");
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
}
}
3) 在JS代码中,只需使用以下命令调用本机java:
window.NativeLocation.doInit();
alert(window.NativeLocation.getLat());
alert(window.NativeLocation.getLong());
这就是所有的人!:-)
编辑:
iPhone解决方案:
public class App extends DroidGap {
// Hold a private member of the class that calls LocationManager
private GetNativeLocation gLocation;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// This line is important, as System Services are not available
// prior to initialization
super.init();
gLocation = new GetNativeLocation(this, appView);
// Add the interface so we can invoke the java functions from our .js
appView.addJavascriptInterface(gLocation, "NativeLocation");
try {
super.loadUrl("file:///android_asset/www/index.html");
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
@Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
}
}
我编写了一个很小的Phonegap插件,它创建了一个自定义类的接口,该自定义类使用iOS的原生CLLocationManager
1)Phonegap插件(JS)
2)使我们能够调用“CCLocationManager”函数的objective-c类
*国产化*
最后,调用main.js中的所有内容
function getLongitudeSuccess(result){
gLongitude = result;
}
function getLatitudeSuccess(result){
gLatitude = result;
}
function runGPSTimer(){
var sTmp = "gps";
theTime = setTimeout('runGPSTimer()', 1000);
NativeLocation.getLongitude(
["getLongitude"],
getLongitudeSuccess,
function(error){ alert("error: " + error); }
);
NativeLocation.getLatitude(
["getLatitude"],
getLatitudeSuccess,
function(error){ alert("error: " + error); }
);
在我的PhoneGap/Sencha Touch 2应用程序中,我创建了该函数
function getLastKnownLocation(){
if(typeof localStorage.lastKnownPosition == "undefined"){
localStorage.lastKnownPosition = JSON.stringify(null);
}
navigator.geolocation.getCurrentPosition(
function(position){
localStorage.lastKnownPosition = JSON.stringify(position);
}
);
return JSON.parse(localStorage.lastKnownPosition);
}
因此,每次调用getLastKnownLocation()时,我都会立即得到一个结果。对于我来说,这是一个很好的解决方案。请记住,此解决方案仅适用于android,正如我前面所说,您必须为每种设备类型找到本机解决方案。祝您好运
function getLastKnownLocation(){
if(typeof localStorage.lastKnownPosition == "undefined"){
localStorage.lastKnownPosition = JSON.stringify(null);
}
navigator.geolocation.getCurrentPosition(
function(position){
localStorage.lastKnownPosition = JSON.stringify(position);
}
);
return JSON.parse(localStorage.lastKnownPosition);
}