Question

我正在创建的应用需要使用gps来跟踪用户在练习期间采取的步数。如果我不能计算步数，至少我想计算非常准确的距离。

我的代码可以将地图和用户位置显示为蓝点。它确实跟着我，但有时候是非常不准确的。我可以得到gps来获取当前位置，但它不是很准确。我听说有一个新的位置API，但我找不到示例代码。我无法发现它们之间的区别..

以下有很多代码是不必要的，原因是我决定不包括地图。我的地图api v2无法在模拟器上显示。 blue-stack显示空白地图，无法输入位置数据。我需要使用与我的团队相同的模拟器。我知道地图不是必需的，但gps计算步数/准确距离是必需的。

import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v4.app.FragmentActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.view.Menu;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MainActivity extends FragmentActivity implements LocationListener, Runnable,     TextWatcher{

protected LocationManager locationManager;
private GoogleMap googleMap;
Button btnStartMove,btnPause,btnResume,btnStop;
//TextView Distance;
static double n=0;
    Long s1,r1;
    double lat1,lon1,lat2,lon2;
    double dis=0.0;
    MyCount counter;
    Thread t1;
    EditText userNumberInput;
    boolean bool=false;
    int count=0;
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    if(isGooglePlay())
    {
        //setContentView(R.layout.activity_main);
        setUpMapIfNeeded();
    }
    btnStartMove=(Button)findViewById(R.id.Start);//start moving
    btnPause=(Button)findViewById(R.id.Pause);//pause
    btnResume=(Button)findViewById(R.id.Resume);//resume
    btnStop=(Button)findViewById(R.id.Stop);
    userNumberInput=(EditText)findViewById(R.id.UserInput);
    userNumberInput.addTextChangedListener(this);
    //Distance=(TextView)findViewById(R.id.Distance);
    btnStartMove.setOnClickListener(new OnClickListener() 
    {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            //start(v);

            //start(v);
    }

    });
    btnPause.setOnClickListener(new OnClickListener() 
    {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            //start(v); 
        }
    });
    btnResume.setOnClickListener(new OnClickListener() 
    {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            //start(v); 
        }
    });
    btnStop.setOnClickListener(new OnClickListener() 
    {
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            //start(v); 
        }
    });
}

@Override
public void afterTextChanged(Editable editable) {
    try
    {
        int no = Integer.parseInt(editable.toString());
        if(no >= 100)
        {
            editable.replace(0, editable.length(), "99");
        }
    }
    catch(NumberFormatException e){}
}



@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
        int arg3) {
    // TODO Auto-generated method stub

}



@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
    // TODO Auto-generated method stub

}

private void setUpMapIfNeeded() {

    if(googleMap == null)
    {
        Toast.makeText(MainActivity.this, "Getting map",
                Toast.LENGTH_LONG).show();
        googleMap =((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.displayMap)).getMap();

        if(googleMap != null)
        {
            setUpMap();
        }
    }

}

private void setUpMap() 
{
    //Enable MyLocation Layer of Google Map
    googleMap.setMyLocationEnabled(true);

    //Get locationManager object from System Service LOCATION_SERVICE
    //LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

    //Create a criteria object to retrieve provider
    Criteria criteria = new Criteria();

    //Get the name of the best provider
    String provider = locationManager.getBestProvider(criteria, true);
    if(provider == null)
    {
        onProviderDisabled(provider);
    }
    //set map type
    googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    //Get current location
    Location myLocation = locationManager.getLastKnownLocation(provider);
    if(myLocation != null)
    {
        onLocationChanged(myLocation);
    }       
    locationManager.requestLocationUpdates(provider, 0, 0, this);
}

private boolean isGooglePlay() 
{
    int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);

    if (status == ConnectionResult.SUCCESS)
    {

        Toast.makeText(MainActivity.this, "Google Play Services is available",
                Toast.LENGTH_LONG).show();
        return(true);
    }
    else
    {
            GooglePlayServicesUtil.getErrorDialog(status, this, 10).show();

    }
    return (false);

 }

@Override
public void onLocationChanged(Location myLocation) {
    //Get latitude of the current location
    double latitude = myLocation.getLatitude();
    //Get longitude of the current location
    double longitude = myLocation.getLongitude();
    //Create a LatLng object for the current location
    LatLng latLng = new LatLng(latitude, longitude);
    //Show the current location in Google Map
    googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
    //Zoom in the Google Map
    googleMap.animateCamera(CameraUpdateFactory.zoomTo(20));
    googleMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("You are here!"));

}

@Override
public void onProviderDisabled(String provider) {
    Toast.makeText(MainActivity.this,
            "Provider disabled by the user. GPS turned off",
            Toast.LENGTH_LONG).show();
}

@Override
public void onProviderEnabled(String provider) {
    Toast.makeText(MainActivity.this,
            "Provider enabled by the user. GPS turned on",
            Toast.LENGTH_LONG).show();
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    Toast.makeText(MainActivity.this, "Provider status changed",
            Toast.LENGTH_LONG).show();
}

public void start (View v){

    switch(v.getId()){
    case R.id.Start:
        Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        if (location != null)
        {
            lat2=location.getLatitude();
            lon2=location.getLongitude();
            bool=true;
            t1=new Thread(this);
            t1.start();
            counter= new MyCount(30000,1000);
            counter.start();

        }
        else
        {
            Toast.makeText(MainActivity.this, "null location",
                    Toast.LENGTH_LONG).show();
        }
     break;
    case R.id.Pause:
        counter.cancel();
        bool=false;
        break;
    case R.id.Resume:
        counter= new MyCount(s1,1000);
     counter.start();
     bool=true;
     break;
//      case R.id.Distance:
//          double time=n*30+r1;
//          //Distance.setText("Distance:" + dis);
//          Toast.makeText(MainActivity.this,"distance in  metres:"+String.valueOf(dis)+"Velocity in m/sec :"+String.valueOf(dis/time)+"Time :"+String.valueOf(time),Toast.LENGTH_LONG).show();
//          Toast.makeText(MainActivity.this, "Value of Count:" + String.valueOf(count),
//                  Toast.LENGTH_LONG).show();
//       break;        
    case R.id.Stop:
        counter.cancel();
        counter= new MyCount(30000,1000);
        bool = false;

    }
}

public class MyCount extends CountDownTimer{
    public MyCount(long millisInFuture, long countDownInterval) {
    super(millisInFuture, countDownInterval);
    }
    @Override
    public void onFinish() {
        counter= new MyCount(30000,1000);
     counter.start();
     n=n+1;
    }
    @Override
    public void onTick(long millisUntilFinished) {
        s1=millisUntilFinished;
        r1=(30000-s1)/1000;
        //e1.setText(String.valueOf(r1));


    }
}

public double getDistance(double lat1, double lon1, double lat2, double lon2) {
    double latA = Math.toRadians(lat1);
    double lonA = Math.toRadians(lon1);
    double latB = Math.toRadians(lat2);
    double lonB = Math.toRadians(lon2);
    double cosAng = (Math.cos(latA) * Math.cos(latB) * Math.cos(lonB-lonA)) +
                    (Math.sin(latA) * Math.sin(latB));
    double ang = Math.acos(cosAng);
    double dist = ang *6371;
    return dist;
}

public static void distanceBetween (double startLatitude, double startLongitude, double endLatitude, double endLongitude, float[] results)
{

}

@Override
public void run() 
{
    count=6;
    //LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); 
    Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
    lat1=location.getLatitude();
    lon1=location.getLongitude();
    while(bool==true)
    {
        if(lat1!=lat2 || lon1!=lon2)
        {
            dis+=getDistance(lat2,lon2,lat1,lon1);
            lat2=lat1;
            lon2=lon1;
            count =7;
            //Distance.setText("Distance: " + dis + " Count: " + count);
            count++;
        }

    }

}}

Answer 1

一旦你有距离，你可以除以人的平均步长，你可以让用户输入参数。

在没有移动的情况下（在步进训练师上）进行锻炼时，这将不起作用。但是对于在户外散步或跑步，这将起作用。

android准确的gps。计算采取的步骤

1 个答案: