在Android上寻找速度和带宽

Question

我试图计算安卓应用程序的速度，每当它被改变。我得到了速度，但我有两个问题:

1-考虑第一次变化并计算速度需要时间。

2-速度不准确，当我开车时，手机给出的速度与汽车的速度不一样!

我的代码是:

这个在onCreate方法中:mlocManager.requestLocationUpdates (LocationManager。GPS_PROVIDER, 20000,100年,mlocListener);

我使用了LocationListener接口，我实现了这个方法:

public void onLocationChanged(Location loc){
        if (firsttime) {
            la1 = loc.getLatitude();
            lo1 = loc.getLongitude();
            firsttime = false;
            start = System.currentTimeMillis();
        } else {
            la2 = loc.getLatitude();
            lo2 = loc.getLongitude();
            end = System.currentTimeMillis();
            long difftime = end - start;
            double diffhoure = (double) difftime / (1000 * 60 * 60);
            double dis = distance(la1, lo1, la2, lo2);
            double speed = dis / diffhoure;
            Toast.makeText(getApplicationContext(),
                    "Your speed is" + speed, Toast.LENGTH_SHORT).show();
            la1 = la2;
            lo1 = lo2;
            start = end;
        }
    }

计算距离的方法为:

double distance(double lat1, double lon1, double lat2, double lon2) {
    // this method uses Haversine Formula
    double R = 6373; // earth radius in KM.
    double dlon = Math.toRadians(lon2 - lon1);
    double dlat = Math.toRadians(lat2 - lat1);
    double a = (Math.sin(dlat / 2)) * (Math.sin(dlat / 2))
            + Math.cos(Math.toRadians(lat1))
            * Math.cos(Math.toRadians(lat2)) * (Math.sin(dlon / 2))
            * (Math.sin(dlon / 2));
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    double d = R * c;
    return d;
}

另外，你能告诉我一个计算WiFi和3G带宽的好方法吗?

提前谢谢你。

感谢你的帮助。

Answer 1

您可以使用此代码获得wifi带宽:

    public class Receiver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {

        WifiManager mgr = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        WifiInfo networks = mgr.getConnectionInfo();
        if (networks != null) {
            Integer linkSpeed = networks.getLinkSpeed();

            Log.i("linkSpeed**************",linkSpeed +"");
        }
}