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GPS提供商及其性能

2011-09-03 89 views
1

有没有一种可能的方式来使用GPS提供商快速检测新的位置？GPS提供商及其性能

来源

2011-09-03 Dev

+0

使用网络提供商...... – st0le

+0

谢谢，但为什么GPS提供商很慢，检测的位置？ – Dev

+0

谢谢stl0e＆Jonas ... – Dev

回答

6

GPS通常很慢 - 就是这样。但也有几件事情可以为了加快用户的体验做到：

  • 立即开始寻找一个位置的应用程序启动 - 不要等到他们到了那需要一个活动位置

  • 使用网络供应商，这往往要快得多

  • 使用被动提供商。即接收已被设备上的其他应用程序获取的位置更新

  • 使用最后已知位置 - 将其存储一段时间，如果存在，则立即为您提供位置（虽然它可能有点旧）

  • 如果适用于您的应用程序的情况下，保存在首选项

本文章由谷歌的雷托迈耶是一个伟大的地方开始自己的位置 - 看看在示例代码和详细的相关链接 http://blog.radioactiveyak.com/2011/06/how-to-build-location-based-apps-that.html

来源

2011-09-03 10:23:41

+0

thinks olie c，但我认为网络提供商不比gps提供商更准确。我如何使用lastknown位置来检测新位置？ – Dev

+2

查看本页面的“快速修复最后一次已知位置”。这很容易http://developer.android.com/guide/topics/location/obtaining-user-location.html –

0

U可以通过网络提供商和GPS提供商检索位置。

如果你想快速检索位置，你可以同时检查两个提供者。 这里是代码..

创建一类像这首：

import android.content.Context; 
import android.content.Intent; 
import android.location.Location; 
import android.location.LocationListener; 
import android.location.LocationManager; 
import android.os.Bundle; 
import android.os.Handler; 
import android.provider.Settings; 
import android.util.Log; 
import android.widget.Toast; 

import com.tcs.android.eventinfo.data.DataStore; 



public class GeoFence { 
// public Timer timer1; 
LocationManager lm; 
LocationResult locationResult; 
boolean gps_enabled=false; 
boolean network_enabled=false; 
Context mContext; 

public Handler handler; 
public GetLastLocation r; 
public boolean isLocationNullSecondTime=false; 

public GeoFence(Context context) { 
    mContext=context; 
    handler = new Handler(); 
    chekStatusOfLocationProvider(isLocationNullSecondTime); 
} 
public void chekStatusOfLocationProvider(boolean isLocationNullSecondTime){ 
    if(lm==null) 
     lm = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE); 

    Log.i("GPS"," GPS"+lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)); 
    Log.i("GPS"," Network"+lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)); 
    Log.i("GPS"," Passive"+lm.isProviderEnabled(LocationManager.PASSIVE_PROVIDER)); 

    if ((!lm.isProviderEnabled(LocationManager.GPS_PROVIDER) 
      && !lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) 
      || isLocationNullSecondTime) { 
     Log.i("GPS", "Inside Constructor"); 

     Toast.makeText(mContext, "Turn on your Location provider", 
       Toast.LENGTH_LONG).show(); 
     Intent myIntent = new Intent(
       Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
     mContext.startActivity(myIntent); 
    } 


} 

public boolean getLocation(LocationResult result) 
{ 
    Log.i("GEo fence","DataStore.IS_THREAD_RUNNING : "+DataStore.IS_THREAD_RUNNING); 
    if(!DataStore.IS_THREAD_RUNNING) { 


/*  if ((!lm.isProviderEnabled(LocationManager.GPS_PROVIDER) 
       && !lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) 
       || isLocationNullSecondTime) { 
      Log.i("GPS", "Inside Constructor"); 

      Toast.makeText(mContext, "Turn on your Location provider", 
        Toast.LENGTH_LONG).show(); 
      Intent myIntent = new Intent(
        Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
      mContext.startActivity(myIntent); 
     }*/ 

    Log.i("GPS","inside getlocation"); 
    //I use LocationResult callback class to pass location value from MyLocation to user code. 
    locationResult=result; 
    //exceptions will be thrown if provider is not permitted. 
    try{gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){} 
    try{network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){} 

    //don't start listeners if no provider is enabled 
    if(!gps_enabled && !network_enabled){ 
     Log.i("GPS","nothing is enable"); 
     return false; 
    } 
    if(gps_enabled){ 
     Log.i("GPS","inside getlocation Gps is enabled"); 
     lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 5000, locationListenerGps); 
    } 
    if(network_enabled){ 
     Log.i("GPS","inside getlocation netwok is enable"); 
     lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,0, 5000, locationListenerNetwork); 
    }  
    r=new GetLastLocation(); 
    handler.postDelayed(r,20000); 
    return true; 
} 
else { 
    return false; 
}} 


LocationListener locationListenerGps = new LocationListener() { 
    public void onLocationChanged(Location location) { 
     DataStore.IS_THREAD_RUNNING=true; 
     Log.i("GPS","inside onLocationcahnged of gps"); 
     isLocationNullSecondTime=false; 
     lm.removeUpdates(this); 
     lm.removeUpdates(locationListenerNetwork); 
     handler.removeCallbacks(r); 
     locationResult.gotLocation(location); 

    } 
    public void onProviderDisabled(String provider) { Log.i("GPS","inside onProviderDisabled of gps");} 
    public void onProviderEnabled(String provider) { Log.i("GPS","inside onProviderEnabled of gps");} 
    public void onStatusChanged(String provider, int status, Bundle extras) {} 
}; 

LocationListener locationListenerNetwork = new LocationListener() { 
    public void onLocationChanged(Location location) { 
     DataStore.IS_THREAD_RUNNING=true; 
     Log.i("GPS","inside onLocationcahnged of Network"); 
     isLocationNullSecondTime=false; 
     lm.removeUpdates(this); 
     lm.removeUpdates(locationListenerGps); 
     handler.removeCallbacks(r); 
     locationResult.gotLocation(location); 

    } 
    public void onProviderDisabled(String provider) {Log.i("GPS","inside onProviderDisabled of Network");} 
    public void onProviderEnabled(String provider) {Log.i("GPS","inside onProviderEnabled of Network");} 
    public void onStatusChanged(String provider, int status, Bundle extras) {} 
}; 

class GetLastLocation implements Runnable { 
    @Override 
    public void run() { 
     DataStore.IS_THREAD_RUNNING=true; 
     Log.i("GPS","inside the thread run"); 
     lm.removeUpdates(locationListenerGps); 
     lm.removeUpdates(locationListenerNetwork); 

     Location net_loc=null, gps_loc=null; 
     if(gps_enabled){ 
      gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER); 
      Log.i("GPS","gps location object :"+gps_loc); 
     } 
     if(network_enabled){ 
      net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); 
      Log.i("GPS","neteork object :"+ net_loc); 
     } 
     //if there are both values use the latest one 
     if(gps_loc!=null && net_loc!=null){ 
      handler.removeCallbacks(r); 
      isLocationNullSecondTime=false; 
      Log.i("GPS","neteork object not null :"+ net_loc); 
      Log.i("GPS","GPS object not null :"+ gps_loc); 
      if(gps_loc.getTime()>net_loc.getTime()) 
       locationResult.gotLocation(gps_loc); 
      else 
       locationResult.gotLocation(net_loc); 
      return; 
     }else{ 
      handler.removeCallbacks(r); 
      if(gps_loc!=null){ 
       isLocationNullSecondTime=false; 
       locationResult.gotLocation(gps_loc); 
       return; 
      } 
      else if(net_loc!=null){ 
       isLocationNullSecondTime=false; 
       locationResult.gotLocation(net_loc); 
       return; 
      } 
      else{ 
       isLocationNullSecondTime=true; 
       Log.i("GPS","Both the object is null and asking for turn on the Location provider :"); 
       locationResult.gotLocation(null); 
       return; 
      } 
     } 



     //locationResult.gotLocation(null); 
    } 
} 

public static abstract class LocationResult{ 
    public abstract void gotLocation(Location location); 
}

然后在活动编写代码或实现这样的gotLocation（位置定位）方法：

public LocationResult locationResult = new LocationResult() { 

    @Override 
    public void gotLocation(final Location location) { 
     // do something 
     mLocation = location; 
     if (geoFence.handler != null) { 
      geoFence.handler.removeCallbacks(geoFence.r); 
     } 
     if (location == null) { 
      if (DataStore.IS_THREAD_RUNNING) { 
       DataStore.IS_THREAD_RUNNING=false; 
      } 
      if (!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)) { 
       createAlert("Turn on ur GPS provider", new int[] { 
         R.string.yes, R.string.no },2); 
       return; 
      } 
      if (!lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER)) { 
       createAlert("Turn on ur Network provider", new int[] { 
         R.string.yes, R.string.no },2); 
       return; 
      } 
      Toast.makeText(PreHomeScreen.this, 
        "Turn on your both Location provider and try again ", 
        Toast.LENGTH_LONG).show(); 

     } else { 
//////////////////////////////////Do ur work/////////////////////////////////////

}

} 
};

来源

2012-04-16 07:55:58

0

我的博客包含如何明星的示例代码t位置服务并等待工作线程中的位置。您可以在应用程序启动时开始搜索位置，但在后台等待时继续运行应用程序。在需要位置之前，用户可能需要做一些事情，并且此时位置服务可以返回可用位置。

http://www.scotthelme.co.uk/blog/android-location-services/

来源

2012-12-21 11:44:22

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