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GPS 提供商及其表现

发布于 2024-12-02 22:12:32 字数 30 浏览 0 评论 0原文

有没有可能使用 GPS 提供商快速检测新位置？

原文

Is there a possible way to detect the new location very fast using GPS provider?

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三寸金莲 2024-12-09 22:12:32

GPS 通常很慢 - 事实就是如此。但是，您可以采取以下措施来加快用户体验：

  • 应用启动后立即开始查找位置 - 不要等到他们进行需要位置的活动

  • 使用网络提供商，这通常要快得多

  • 使用被动提供程序。即接收设备上其他应用程序获取的位置更新

  • 使用最后已知的位置 - 该位置会存储一段时间，如果存在，会立即为您提供位置（尽管可能有点旧）< /p>

  • 如果适合您的应用程序的上下文，请自行存储一个位置prefs

Google 的 Reto Meier 撰写的这篇文章是一个很好的起点 - 查看相关链接以获取示例代码和更多详细信息
http://blog.radioactiveyak.com /2011/06/how-to-build-location-based-apps-that.html

GPS is often slow - that's just the way it is. But there are several things you can do in order to speed up the experience for the user:

  • Start looking for a location as soon as the app starts - don't wait until they get to an activity that needs a location

  • Use the network provider, which is often much faster

  • Use the passive provider. i.e. receive location updates that have been acquired by other apps on the device

  • Use the Last Known location - this is stored for a while, and if it exists, gives you a location instantly (though it may be a little old)

  • If suitable in your app's context, store a location yourself in prefs

This article by Google's Reto Meier is a great place to start - look at the related links for sample code and more detail
http://blog.radioactiveyak.com/2011/06/how-to-build-location-based-apps-that.html

回复 原文
花海 2024-12-09 22:12:32

您可以通过网络提供商和 GPS 提供商检索位置。

如果您想快速检索位置，您可以同时检查两个提供商。
这是代码..

首先创建一个这样的类：

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);
}

然后在您的 Activity 中编写代码或实现像这样的 gotLocation( Location location) 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/////////////////////////////////////

}

    }
};

U can retrieve the location through network provider and GPS provider.

u can check both the providers simultaneously if u want a fast retrieval of the location.
Here is the code..

Create a class like this first :

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);
}

then in your Activity write the code or implement the gotLocation( Location location) method like this:

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/////////////////////////////////////

}

    }
};
回复 原文
祁梦 2024-12-09 22:12:32

我的博客包含有关如何启动位置服务并在工作线程中等待位置的示例代码。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，此时定位服务可以返回可用的位置。

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

My blog contains example code on how to start the location services and wait for a location in a worker thread. You can start searching for a location the moment the app starts but continue running the app whilst it waits in the background. The user may need to do something before the location is required and in this time the location services could return a usable location.

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

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