计算行进距离[关闭]答案

【问题标题】：Calculate traveled distance [closed]计算行进距离[关闭]
【发布时间】：2023-03-04 00:45:01
【问题描述】：

我想开发一个可以计算实际行驶距离并在文本视图中显示的安卓应用。这是我使用的代码，但是当您返回起点时，此代码会减少行进距离。任何人都可以帮助修复此代码，使其只能累积距离吗？

    display = (TextView) findViewById(R.id.info);

    LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE); 
    lm.requestLocationUpdates(lm.GPS_PROVIDER, 0,0, Loclist);
    loc = lm.getLastKnownLocation(lm.GPS_PROVIDER);

    if (loc == null) {
        display.setText("No GPS location found");
    } else {
        //set Current latitude and longitude
        currentLon = loc.getLongitude();
        currentLat = loc.getLatitude();
    }
    //Set the last latitude and longitude
    lastLat = currentLat;
    lastLon = currentLon;
}

LocationListener Loclist = new LocationListener() {
    @Override
    public void onLocationChanged(Location location) {
        //set Current latitude and longitude
        currentLon=loc.getLongitude();
        currentLat=loc.getLatitude();
        // TODO Auto-generated method stub

        //start location manager
        LocationManager lm =(LocationManager) getSystemService(LOCATION_SERVICE);

        //Get last location
        Location loc = lm.getLastKnownLocation(lm.GPS_PROVIDER);

        //Request new location
        lm.requestLocationUpdates(lm.GPS_PROVIDER, 0,0, Loclist);

        //Get new location
        Location loc2 = lm.getLastKnownLocation(lm.GPS_PROVIDER);

        //get the current lat and long
        currentLat = loc.getLatitude();
        currentLon = loc.getLongitude();

        Location locationA = new Location("point A");
        locationA.setLatitude(lastLat);
        locationA.setLongitude(lastLon);

        Location locationB = new Location("point B");
        locationB.setLatitude(currentLat);
        locationB.setLongitude(currentLon);

        double distanceMeters = locationA.distanceTo(locationB);

        double distanceKm = distanceMeters / 1000f;

        display.setText(String.format("%.2f Km",distanceKm ));                  

        Location locationC = new Location("point c");
        locationA.setLatitude(currentLat);
        locationA.setLongitude(currentLon);
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub

提前致谢。

【问题讨论】：

我很困惑。你如何让它只累积距离？这不是你已经在做的吗？
不是在累积距离，当你回到原来的距离时，距离正在减少，但是利宾已经解决了这个问题。

标签： android eclipse geolocation

【解决方案1】：

按照这些步骤....

第一步：

   private  Location lastLocation;
   private  double totalDistance = 0;

第 2 步：在 onCreate() 中

        //Get last location
        lastLocation = lm.getLastKnownLocation(lm.GPS_PROVIDER);

第 2 步：onLocationChanged(位置) // 计算距离

        double distanceMeters = lastLocation.distanceTo(location);
        double distanceKm = distanceMeters / 1000f;
        // when the location change keep updating the total distance
        totalDistance += distanceKm;
        lastLocation = location; // assign the current location to lastLocation.

【讨论】：