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POSpeed of devices in Android
 

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    <p>I am calculating the speed using the Distance / Time however when onlocation changed it goes up to infinity and decrease gradually. </p> <pre><code>package water.Spill; import java.io.IOException; import java.math.BigDecimal; import java.util.ArrayList; import java.util.List; import java.util.Timer; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.location.Criteria; import android.location.Location; import android.location.LocationListener; import android.location.LocationManager; import android.location.LocationProvider; import android.os.Bundle; import android.os.Handler; import android.util.FloatMath; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import water.Spill.LatLon; import android.hardware.Camera; public class GPS2 extends Activity implements SurfaceHolder.Callback { LocationManager locationManager; LocationListener locationListener; //text views to display latitude and longitude TextView latituteField; TextView longitudeField; TextView currentSpeedField; TextView kmphSpeedField; TextView avgSpeedField; TextView avgKmphField; TextView gpsOnOff; //objects to store positional information protected double lat; protected double lon; ArrayList&lt;LatLon&gt; myList = new ArrayList&lt;LatLon&gt;(); //objects to store values for current and average speed protected double currentSpeed; protected double kmphSpeed; protected double avgSpeed; protected double avgKmph; protected double totalSpeed; protected double totalKmph; //Camera private SurfaceView mSurfaceView ; private SurfaceHolder mSurfaceHolder; private Camera mCamera; private boolean mPreviewRunning; boolean gps_enabled = false; boolean network_enabled = false; //counter that is incremented every time a new position is received, used to calculate average speed int counter = 0; double totalDistance=0; //timer TextView text3; TextView secondLabel; TextView minutesLabel; TextView hourLabel; long starttime = 0; long spdstarttime = 0; Handler h2 = new Handler(); Runnable run = new Runnable() { public void run() { long spdmillis = System.currentTimeMillis() - spdstarttime; long millis = System.currentTimeMillis() - starttime; int spdseconds = (int) (spdmillis / 1000); int spdhours = spdseconds/60/60; int seconds = (int) (millis / 1000); int minutes = seconds / 60; int hours = minutes/60; seconds = seconds % 60; minutes = minutes % 60; currentSpeedField = (TextView) findViewById(R.id.speed); secondLabel = (TextView) findViewById(R.id.seconds); minutesLabel = (TextView) findViewById(R.id.minutes); hourLabel = (TextView) findViewById(R.id.hour); secondLabel.setText(String.valueOf(seconds) + "s"); minutesLabel.setText(String.valueOf(minutes)+ "m"); hourLabel.setText(String.valueOf(hours)+ "h"); if(myList.size() &gt; 1){ LatLon ll1 = myList.get(myList.size()-2); LatLon ll2 = myList.get(myList.size()-1); double distance = 0; distance = distFrom(ll1.getLat(), ll1.getLon(), ll2.getLat(), ll2.getLon()); if(ll1.getLat()== ll2.getLat() &amp;&amp; ll1.getLon() == ll2.getLon()){ currentSpeed = 0; } else{ distance = round(distance,3,BigDecimal.ROUND_HALF_UP); currentSpeed = (distance*1000)/spdseconds; double test12 = spdseconds; System.out.println("distance " + (distance*1000)); System.out.println("time " + test12); //currentSpeed = round(currentSpeed,3,BigDecimal.ROUND_HALF_UP); } currentSpeedField.setText(String.valueOf(currentSpeed) + "km/h"); } h2.postDelayed(this, 500); } }; Timer timer = new Timer(); /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.gps2); mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera); mSurfaceHolder = mSurfaceView.getHolder(); mSurfaceHolder.addCallback(this); mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); text3 = (TextView)findViewById(R.id.text3); Button b = (Button)findViewById(R.id.button); b.setText("stop"); timer = new Timer(); b.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Button b = (Button)v; b.setText("stop"); if(b.getText().equals("stop")){ timer.cancel(); timer.purge(); h2.removeCallbacks(run); stop(); Button bStop = (Button)findViewById(R.id.button4); bStop.setEnabled(true); b.setEnabled(false); } } }); run(); Button b2 = (Button)findViewById(R.id.button4); b2.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { getLocation(); h2.postDelayed(run, 0); starttime = System.currentTimeMillis(); Button bStart = (Button)findViewById(R.id.button4); bStart.setEnabled(false); Button b = (Button)findViewById(R.id.button); b.setEnabled(true); } }); } private void getLocation() { { locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); locationListener = new MyLocationListener(); locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 3000, 0,locationListener); locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,3000,0,locationListener); } } public void stop(){ locationManager.removeUpdates(locationListener); } @Override public void onResume() { super.onResume(); } @Override public void onPause() { locationManager.removeUpdates(locationListener); super.onPause(); } private void run(){ final Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); criteria.setSpeedRequired(true); criteria.setAltitudeRequired(false); criteria.setBearingRequired(false); criteria.setCostAllowed(true); criteria.setPowerRequirement(Criteria.POWER_LOW); //Acquire a reference to the system Location Manager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE); try{network_enabled=locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);}catch(Exception ex){} try{gps_enabled=locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);}catch(Exception ex){} // Define a listener that responds to location updates locationListener = new MyLocationListener(); String Results="Unavailable"; Button bStart = (Button)findViewById(R.id.button4); bStart.setEnabled(false); TextView gpsOnOff = (TextView) findViewById(R.id.gpsOnOff); if(network_enabled) { Results="Available"; Button bStartGot = (Button)findViewById(R.id.button4); bStartGot.setEnabled(true); } else if(gps_enabled) { Results="Available"; Button bStartGot = (Button)findViewById(R.id.button4); bStartGot.setEnabled(true); gpsOnOff.setText(Results); } } //Method to round the doubles to a max of 3 decimal places public static double round(double unrounded, int precision, int roundingMode) { BigDecimal bd = new BigDecimal(unrounded); BigDecimal rounded = bd.setScale(precision, roundingMode); return rounded.doubleValue(); } public static double distFrom(double lat1, double lng1, double lat2, double lng2) { double earthRadius = 6371; double dLat = Math.toRadians(lat2-lat1); double dLng = Math.toRadians(lng2 -lng1); double a = Math.sin(dLat/2) * Math.sin(dLat/2) + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * Math.sin(dLng/2) * Math.sin(dLng/2); double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); double dist = earthRadius * c; return dist; } public class MyLocationListener implements LocationListener { public void onLocationChanged(Location newLocation) { //current speed fo the gps device spdstarttime = System.currentTimeMillis(); //kmphSpeed = round((currentSpeed*3.6),3,BigDecimal.ROUND_HALF_UP); //all speeds added together totalSpeed = totalSpeed + currentSpeed; totalKmph = totalKmph + kmphSpeed; //calculates average speedss //avgSpeed = round(totalSpeed/counter,3,BigDecimal.ROUND_HALF_UP); //avgKmph = round(totalKmph/counter,3,BigDecimal.ROUND_HALF_UP); //gets position lat = round(((double) (newLocation.getLatitude())),9,BigDecimal.ROUND_HALF_UP); lon = round(((double) (newLocation.getLongitude())),9,BigDecimal.ROUND_HALF_UP); latituteField = (TextView) findViewById(R.id.lat); longitudeField = (TextView) findViewById(R.id.lon); TextView distanceField = (TextView) findViewById(R.id.distance); LatLon ll = new LatLon(lat, lon); myList.add(ll); if(myList.size() &gt; 1){ LatLon ll2 = myList.get(myList.size()-2); double dist = distFrom( ll2.getLat(), ll2.getLon(), ll.getLat(), ll.getLon()); dist = round(dist,3,BigDecimal.ROUND_HALF_UP); totalDistance += dist; totalDistance = round(totalDistance,3,BigDecimal.ROUND_HALF_UP); distanceField.setText("Distance: " + String.valueOf(totalDistance)+ "km"); Context context = getApplicationContext(); CharSequence text = "Location Changed , Distance Accumulated"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); toast.show(); } latituteField.setText(String.valueOf(lat)); longitudeField.setText(String.valueOf(lon)); } public void onProviderDisabled(String provider) { } public void onProviderEnabled(String provider) { } public void onStatusChanged(String provider, int status, Bundle extras) { if(status==LocationProvider.OUT_OF_SERVICE) { gpsOnOff.setText("OFF"); } else { if(status==LocationProvider.TEMPORARILY_UNAVAILABLE) { gpsOnOff.setText("OFF"); } else { if(status==LocationProvider.AVAILABLE) { gpsOnOff.setText("ON"); } } } } } Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() { public void onPictureTaken(byte[] imageData, Camera c) { /*if (imageData != null) { Intent mIntent = new Intent(); StoreByteImage(mContext, imageData, 50, "ImageName"); mCamera.startPreview(); setResult(FOTO_MODE, mIntent); finish(); }*/ } }; public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { // TODO Auto-generated method stub if (mPreviewRunning) { mCamera.stopPreview(); } Camera.Parameters p = mCamera.getParameters(); List&lt;Camera.Size&gt; list = p.getSupportedPreviewSizes (); Camera.Size size = list.get(0); p.setPreviewSize(size.width, size.height); mCamera.setParameters(p); //p.setPreviewSize(w, h); //p.setPreviewSize(300, 200); try { mCamera.setPreviewDisplay(holder); } catch (IOException e) { e.printStackTrace(); } mCamera.startPreview(); mPreviewRunning = true; } public void surfaceCreated(SurfaceHolder arg0) { // TODO Auto-generated method stub mCamera = Camera.open(); } public void surfaceDestroyed(SurfaceHolder arg0) { // TODO Auto-generated method stub mCamera.stopPreview(); mPreviewRunning = false; mCamera.release(); } </code></pre> <p>} </p>
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    1. USTinyfool
    1. USWcgEddie Lim
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      1. VTApproveEditSuggestion
    2. VO
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      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhat is your actual qustion? As it's worded at the moment it is very ambiguous. Please reword it as an actual question and provide any code examples that can help describe your specific needs.
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      1. POSpeed of devices in Android
      1. USJustin Shield
    2. COHow are you calculating Distance? How are you calculating Time?
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      1. POSpeed of devices in Android
      1. USTed Hopp
    3. COTo what purpose, the speed and time between the location updates wont be linear if they are far apart, you also have accuracy to worry about etc. Also why not just use the locations getSpeed() method if you want current speed?
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      1. POSpeed of devices in Android
      1. USIdistic
 

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