关于GPS的问题

T-Quake 2010-09-27 06:50:06

大家好,我最近在调关于GPS的东西,

我搞了个网上的代码写了个测试程序



import android.app.Activity;   

import android.content.Context;   

import android.location.Criteria;   

import android.location.Location;   

import android.location.LocationListener;   

import android.location.LocationManager;   

import android.os.Bundle;   

import android.widget.TextView;   

  

public class CurrentLocation extends Activity {   

    /** Called when the activity is first created. */  

    @Override  

    public void onCreate(Bundle savedInstanceState) {   

        super.onCreate(savedInstanceState);   

        setContentView(R.layout.main);   

        LocationManager locationManager;   

        String serviceName = Context.LOCATION_SERVICE;   

        locationManager = (LocationManager)getSystemService(serviceName);   

        //String provider = LocationManager.GPS_PROVIDER;   

           

        Criteria criteria = new Criteria();   

        criteria.setAccuracy(Criteria.ACCURACY_FINE);   

        criteria.setAltitudeRequired(false);   

        criteria.setBearingRequired(false);   

        criteria.setCostAllowed(true);   

        criteria.setPowerRequirement(Criteria.POWER_LOW);   

        String provider = locationManager.getBestProvider(criteria, true);   

           

        Location location = locationManager.getLastKnownLocation(provider);   

        updateWithNewLocation(location);   

        locationManager.requestLocationUpdates(provider, 2000, 10,   

                        locationListener);   

    }   

   private final LocationListener locationListener = new LocationListener() {   

            public void onLocationChanged(Location location) {   

            updateWithNewLocation(location);   

            }   

            public void onProviderDisabled(String provider){   

            updateWithNewLocation(null);   

            }   

            public void onProviderEnabled(String provider){ }   

            public void onStatusChanged(String provider, int status,   

            Bundle extras){ }   

    };   

    private void updateWithNewLocation(Location location) {   

            String latLongString;   

            TextView myLocationText;   

            myLocationText = (TextView)findViewById(R.id.myLocationText);   

            if (location != null) {   

            double lat = location.getLatitude();   

            double lng = location.getLongitude();   

            latLongString = "纬度:" + lat + "\n经度:" + lng;   

            } else {   

            latLongString = "无法获取地理信息";   

            }   

            myLocationText.setText("您当前的位置是:\n" +   

            latLongString);   

    }   

}

可是不知道为什么怎么总是去调用A-GPS,并且去设置GPRS的东西,可是我不想去走GPRS的A-GPS,而是想走GPS.不知道是不是接口调用的有问题.

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T-Quake 2010-09-28

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我看了下android的A-GPS的流程. 是先调用标准API函数,然后去执行/hardware/libXXX/gps/gps.c程序中的一些接口,而这些接口会去调用/vendor/XXX/general/XXX/agps/libgst/XXX.so(驱动代码)

所以每次都会去做A-gps流程的动作,配置什么网络拉等等.

难道需要自己另外实现API?

T-Quake 2010-09-28