how can i pass latLongString to elhActivity and show it on the screen....both java files are under same package com.elh.whereami;
i used putExtra and getExtars with intent and still nothing is showing on the screen
this is the whereami.java code
package com.elh.database;
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.os.Bundle;
//import android.widget.TextView;
public class whereami extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LocationManager locationManager;
String context = Context.LOCATION_SERVICE;
locationManager = (LocationManager) getSystemService(context);
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) {
}
};
public void updateWithNewLocation(Location location) {
String latLongString;
String addressString = "No address found";
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
latLongString = "Lat:" + lat + "\nLong:" + lng;
} else {
latLongString = "No location found";
}
Intent intent = new Intent(this, elhActivity.class);
intent.putExtra("the_latLongString", latLongString);
startActivity(intent);
}
}
and this is the elhActivity.java
package com.elh.database;
import android.app.Activity;
import android.widget.TextView;
public class elhActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String latlonginfo = getIntent().getStringExtra("the_latLongString");
TextView tv = new TextView(this);
tv.setText(latlonginfo);
setContentView(tv);
}
}
getIntent().getExtra() will return a Bundle object which contains the objects you place using putExtra().
For example:
Bundle arguments = getIntent().getExtras();
String latlonginfo = arguments.getString("the_latLongString");
TextView tv = new TextView(this);
tv.setText(latlonginfo);
setContentView(tv);
Intent myIntent = this.getIntent();
String latlonginfo = myIntent.getStringExtra("the_latLongString");
The problem might be you are using setContentView twice in your code.
setContentView(R.layout.main);
setContentView(tv);
You will probably have to do away with the 1st setContentView.
or better still add a TextView in the layout in design time and intialize your textview with latlonginfo.
Consider creating a separate XML layout, say child_dialog.xml for the second activity.
public class ChildActivity extends Activity {
private String pushedValue;
#Override
protected void onCreate(Bundle b){
super.onCreate(b);
setContentView(R.layout.child_dialog);
try {
pushValue= getIntent().getExtras().getString("the_latLongString");
}
catch(Exception e){
pushValue= "";
}
}
}
Related
I am having trouble implementing a LocationListener.
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
TextView latitudeTV;
TextView longitudeTV;
TextView altitudeTV;
TextView locationNameTV;
double latitude;
double longitude;
double altitude;
String locationName;
LocationManager locationManager;
Location location;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
latitudeTV = (TextView) findViewById(R.id.latitude);
longitudeTV = (TextView) findViewById(R.id.longitude);
altitudeTV = (TextView) findViewById(R.id.altitude);
locationNameTV = (TextView) findViewById(R.id.locationName);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 0, locationListener);
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
onLocationChanged(location);
LocationListener locationListener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
longitude = location.getLongitude();
latitude = location.getLatitude();
altitude = location.getAltitude();
locationName = "Placeholder";
longitudeTV.setText("Longitude: \n" + longitude + "°");
latitudeTV.setText("Latitude: \n" + latitude + "°");
altitudeTV.setText("Altitude: \n" + altitude + "m");
locationNameTV.setText("Location: \n" + locationName);
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
}
};
}
}
I'm not sure if it's a syntax issue or a scoping issue, but I keep getting "unable to resolve symbol" errors. It's acting like I haven't implemented the LocationListener methods. I have tried adding implements LocationListener to MainActivity and that shows an error saying I have not implemented the LocationListener methods. I'm not sure where my mistake is.
EDIT:
I've changed my code per your answers. When I try to implement //locationManager.requestLocationUpdates(Context.LOCATION_SERVICE, 5000, 0, this); I get the following when trying to launch the app: LocationTestApp keeps stopping. I've commented out that line, and the app works again.
public class MainActivity extends AppCompatActivity implements LocationListener {
TextView latitudeTV;
TextView longitudeTV;
TextView altitudeTV;
double latitude;
double longitude;
double altitude;
LocationManager locationManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
latitudeTV = (TextView) findViewById(R.id.latitude);
longitudeTV = (TextView) findViewById(R.id.longitude);
altitudeTV = (TextView) findViewById(R.id.altitude);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
//locationManager.requestLocationUpdates(Context.LOCATION_SERVICE, 5000, 0, this);
Location location = locationManager.getLastKnownLocation(locationManager.NETWORK_PROVIDER);
onLocationChanged(location);
}
#Override
public void onLocationChanged(Location location) {
longitude = location.getLongitude();
latitude = location.getLatitude();
altitude = location.getAltitude();
longitudeTV.setText("Longitude: \n" + longitude + "°");
latitudeTV.setText("Latitude: \n" + latitude + "°");
altitudeTV.setText("Altitude: \n" + altitude + "m");
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
}
}
A LocationListener class, in this case an Activity, should be defined as below:
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
public class MainActivity extends AppCompatActivity implements LocationListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
...
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 0, this); // Note: You pass this, so the overridden methods
}
#Override
public void onLocationChanged(Location location) {
// Do your stuff here
}
#Override
public void onProviderDisabled(String provider) {}
#Override
public void onProviderEnabled(String provider) {}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
And this is the solution in jle's comments.
But if you want to use the locationListener that you've declared in your onCreate, you should declare it before using it, in this way:
...onCreate(...) {
...
LocationListener locationListener = new LocationListener() {...} // Define this...
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000, 0, locationListener); // ...and then call this
location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
onLocationChanged(location);
}
I've been following some tutorials and creating some simple android apps but I'm having some trouble with that one it only consists in showing the current location (longitude, latitude, altitude).
Any ideas about whats going on? Thanks in advance!
package com.ricard.location.app;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
TextView textLat;
TextView textLong;
TextView textAlt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textLat = (TextView) findViewById(R.id.textLat);
textLong = (TextView) findViewById(R.id.textLong);
textAlt = (TextView) findViewById(R.id.textAlt);
LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener ll = new mylocationlistener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
}
class mylocationlistener implements LocationListener{
#Override
public void onLocationChanged(Location location){
if(location != null)
{
double plong = location.getLongitude();
double plat = location.getLatitude();
double palt = location.getAltitude();
textLat.setText(Double.toString(plat));
textLong.setText(Double.toString(plong));
textAlt.setText(Double.toString(palt));
}
}
#Override
public void onStatusChanged(String s, int i, Bundle bundle) {
}
#Override
public void onProviderEnabled(String s) {
}
#Override
public void onProviderDisabled(String s) {
}
}
}
There was an error with the reception of the signal on this device I tested it on a new one and it worked so it was a Hardware error thought.
Thanks!
private void moveToCurrentLocation() {
Criteria criteria = new Criteria();
LocationManager locationManager = (LocationManager) getContext().getSystemService(LOCATION_SERVICE);
String provider = locationManager.getBestProvider(criteria, true);
if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
Location location = locationManager.getLastKnownLocation(provider);
double latitude = location.getLatitude();
double longitude = location.getLongitude();
LatLong latLong = new LatLong(latitude, longitude);
CameraPosition cameraPosition = new CameraPosition()
.target(latLong).zoom(whateverZoomThatYouWant);
map.animateCameraTo(cameraPosition);
}
// that is for fragment if you use it in activity delete --> getContext()
I am trying to get a location (latitude, longitude) on my Android smartphone (HTC Desire HD), using Wifi-network and GPS.
This is the code I use, only I keep getting "Location not available"
Iam working with Eclipse IDE.
import android.app.Activity;
import android.content.Context;
import android.location.Criteria;
import com.example.shortsproject.R;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;
public class LocationGetter extends Activity implements LocationListener {
private TextView latituteField;
private TextView longitudeField;
private LocationManager locationManager;
private String provider;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location);
latituteField = (TextView) findViewById(R.id.locationtext);
longitudeField = (TextView) findViewById(R.id.locationtext2);
// Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the location provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
onLocationChanged(location);
} else {
latituteField.setText("Location not available");
longitudeField.setText("Location not available");
}
}
/* Request updates at startup */
#Override
protected void onResume() {
super.onResume();
locationManager.requestLocationUpdates(provider, 400, 1, this);
}
/* Remove the locationlistener updates when Activity is paused */
#Override
protected void onPause() {
super.onPause();
locationManager.removeUpdates(this);
}
#Override
public void onLocationChanged(Location location) {
int lat = (int) (location.getLatitude());
int lng = (int) (location.getLongitude());
latituteField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
Toast.makeText(this, "Enabled new provider " + provider,
Toast.LENGTH_SHORT).show();
}
#Override
public void onProviderDisabled(String provider) {
Toast.makeText(this, "Disabled provider " + provider,
Toast.LENGTH_SHORT).show();
}
}
Can someone help me with this?
I have been trying to print my lang and long coordinates for the past two days, I have chopped and changed code in order to make it work, in a bit of a muddle now and don't understand why it won't work, I am new to Android Development whilst consulting a book (Beginning Android Development) but it doesn't touch on this subject, any help would be greatly appreciated.
It compiles and I don't get any errors, however it does not print out to the EditText boxes in the application, defined in main.xml.
Here is my code for the Java file:
package com.emergency;
import android.app.Activity;
import android.location.Location;
import android.location.LocationListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.content.Context;
import android.location.LocationManager;
import android.location.Criteria;
public class EmergencyLocation extends Activity implements LocationListener {
private TextView latitudeField;
private TextView longitudeField;
private LocationManager locationManager;
private String provider;
/** Called when the activity is first created. **/
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
latitudeField = (TextView) findViewById(R.id.long_lat1);
longitudeField = (TextView) findViewById(R.id.long_lat2);
// Get the location manager
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the location provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
locationManager.requestLocationUpdates(provider, 0, 0, this);
Location location = locationManager.getLastKnownLocation(provider);
onLocationChanged(location);
}
#Override
protected void onDestroy() {
super.onDestroy();
locationManager.removeUpdates(this);
}
#Override
public void onLocationChanged(Location location) {
if (location != null) {
System.out.println("Provider " + provider + " has been selected.");
int lat = (int) (location.getLatitude());
int lng = (int) (location.getLongitude());
latitudeField.setText(String.valueOf(lat));
longitudeField.setText(String.valueOf(lng));
/*Toast.makeText(EmergencyLocation.this,
"Longitude " + longitudeField + "Latitude " + latitudeField, Toast.LENGTH_LONG).show();*/
//getting longitude to display in an EditText box
/*EditText lngtude = (EditText) findViewById(R.id.longitudeField);
lngtude.setText(String.valueOf(lng));
EditText lattude = (EditText) findViewById(R.id.latitudeField);
lattude.setText(String.valueOf(lat)); */
EditText lngtude = (EditText) findViewById(R.id.longitudeField);
lngtude.setText(String.valueOf(lng), TextView.BufferType.EDITABLE);
EditText lattude = (EditText) findViewById(R.id.latitudeField);
lattude.setText(String.valueOf(lat), TextView.BufferType.EDITABLE);
} else {
latitudeField.setText("Provider not available");
longitudeField.setText("Provider not available");
}
}
#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
}
/* #Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button simpleBtn = (Button) findViewById(R.id.location);
simpleBtn.setOnClickListener(new View.OnClickListener() {*/
}
;
I don't believe you're using EditText.setText correctly. See this post as well.
EditText lngtude = (EditText) findViewById(R.id.longitudeField);
lngtude.setText(String.valueOf(lng), TextView.BufferType.EDITABLE);
EditText lattude = (EditText) findViewById(R.id.latitudeField);
lattude.setText(String.valueOf(lat), TextView.BufferType.EDITABLE);
You shouldn't call onLocationChanged() from code. That method runs when the location actually changes. On the emulator you have to simulate a location change, either by sending coordinates from the DDMS perspective or by using the geo fix command in a telnet session.
UPDATED AT BOTTOM
I have written an application that logs the users position, current speed, average speed and top speed. I would like to know how to make the application do the following things:
prevent the screen from turning off while it is open on the screen
if the user opens another app or returns to the home screen, gets a call etc, the app should keep collecting data
(or would it be better to just write all data to a database everytime the location is updated? and maybe have a button to signify when to start and stop collecting data?)
here is the code that I have written. (feel free to use it if you want and if you have any recommendations on how I might improve it I am very open to constructive criticism :D )
package Hartford.gps;
import java.math.BigDecimal;
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 GPSMain extends Activity implements LocationListener {
LocationManager locationManager;
LocationListener locationListener;
//text views to display latitude and longitude
TextView latituteField;
TextView longitudeField;
TextView currentSpeedField;
TextView kmphSpeedField;
TextView avgSpeedField;
TextView avgKmphField;
//objects to store positional information
protected double lat;
protected double lon;
//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;
//counter that is incremented every time a new position is received, used to calculate average speed
int counter = 0;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
run();
}
#Override
public void onResume() {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 1, this);
super.onResume();
}
#Override
public void onPause() {
locationManager.removeUpdates(this);
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);
// Define a listener that responds to location updates
locationListener = new LocationListener() {
public void onLocationChanged(Location newLocation) {
counter++;
//current speed fo the gps device
currentSpeed = round(newLocation.getSpeed(),3,BigDecimal.ROUND_HALF_UP);
kmphSpeed = round((currentSpeed*3.6),3,BigDecimal.ROUND_HALF_UP);
//all speeds added together
totalSpeed = totalSpeed + currentSpeed;
totalKmph = totalKmph + kmphSpeed;
//calculates average speed
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())),3,BigDecimal.ROUND_HALF_UP);
lon = round(((double) (newLocation.getLongitude())),3,BigDecimal.ROUND_HALF_UP);
latituteField = (TextView) findViewById(R.id.lat);
longitudeField = (TextView) findViewById(R.id.lon);
currentSpeedField = (TextView) findViewById(R.id.speed);
kmphSpeedField = (TextView) findViewById(R.id.kmph);
avgSpeedField = (TextView) findViewById(R.id.avgspeed);
avgKmphField = (TextView) findViewById(R.id.avgkmph);
latituteField.setText("Current Latitude: "+String.valueOf(lat));
longitudeField.setText("Current Longitude: "+String.valueOf(lon));
currentSpeedField.setText("Current Speed (m/s): "+String.valueOf(currentSpeed));
kmphSpeedField.setText("Cuttent Speed (kmph): "+String.valueOf(kmphSpeed));
avgSpeedField.setText("Average Speed (m/s): "+String.valueOf(avgSpeed));
avgKmphField.setText("Average Speed (kmph): "+String.valueOf(avgKmph));
}
//not entirely sure what these do yet
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 1, locationListener);
}
//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();
}
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
#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
}
}
BOTH PROBLEMS SOLVED THANKS TO ANSWERS FROM Marco Grassi AND Marcovena.
New Code:
package Hartford.gps;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.PowerManager;
import android.widget.TextView;
public class GPSMain extends Activity {
//text views to display latitude and longitude
static TextView latituteField;
static TextView longitudeField;
static TextView currentSpeedField;
static TextView kmphSpeedField;
static TextView avgSpeedField;
static TextView avgKmphField;
static TextView topSpeedField;
static TextView topKmphField;
//objects to store positional information
protected static double lat;
protected static double lon;
//objects to store values for current and average speed
protected static double currentSpeed;
protected static double kmphSpeed;
protected static double avgSpeed;
protected static double avgKmph;
protected static double totalSpeed;
protected static double totalKmph;
protected static double topSpeed=0;
protected static double topKmph=0;
//counter that is incremented every time a new position is received, used to calculate average speed
static int counter = 0;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
PowerManager powerManager = (PowerManager)getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock wL = powerManager.newWakeLock(PowerManager.SCREEN_BRIGHT_WAKE_LOCK,"My Tag");
wL.acquire();
startService(new Intent(this, Calculations.class));
latituteField = (TextView) findViewById(R.id.lat);
longitudeField = (TextView) findViewById(R.id.lon);
currentSpeedField = (TextView) findViewById(R.id.speed);
kmphSpeedField = (TextView) findViewById(R.id.kmph);
avgSpeedField = (TextView) findViewById(R.id.avgspeed);
avgKmphField = (TextView) findViewById(R.id.avgkmph);
topSpeedField = (TextView) findViewById(R.id.topspeed);
topKmphField = (TextView) findViewById(R.id.topkmph);
}
static void run(){
latituteField.setText("Current Latitude: "+String.valueOf(lat));
longitudeField.setText("Current Longitude: "+String.valueOf(lon));
currentSpeedField.setText("Current Speed (m/s): "+String.valueOf(currentSpeed));
kmphSpeedField.setText("Cuttent Speed (kmph): "+String.valueOf(kmphSpeed));
avgSpeedField.setText("Average Speed (m/s): "+String.valueOf(avgSpeed));
avgKmphField.setText("Average Speed (kmph): "+String.valueOf(avgKmph));
topSpeedField.setText("Top Speed (m/s): "+String.valueOf(topSpeed));
topKmphField.setText("Top Speed (kmph): "+String.valueOf(topKmph));
}
}
and
package Hartford.gps;
import java.math.BigDecimal;
import android.app.Service;
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.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class Calculations extends Service implements LocationListener {
static LocationManager locationManager;
LocationListener locationListener;
private static final String TAG = "Calculations";
#Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
#Override
public void onCreate() {
Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show();
Log.d(TAG, "onCreate");
run();
}
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);
// Define a listener that responds to location updates
locationListener = new LocationListener() {
public void onLocationChanged(Location newLocation) {
GPSMain.counter++;
//current speed for the GPS device
GPSMain.currentSpeed = round(newLocation.getSpeed(),3,BigDecimal.ROUND_HALF_UP);
GPSMain.kmphSpeed = round((GPSMain.currentSpeed*3.6),3,BigDecimal.ROUND_HALF_UP);
if (GPSMain.currentSpeed>GPSMain.topSpeed) {
GPSMain.topSpeed=GPSMain.currentSpeed;
}
if (GPSMain.kmphSpeed>GPSMain.topKmph) {
GPSMain.topKmph=GPSMain.kmphSpeed;
}
//all speeds added together
GPSMain.totalSpeed = GPSMain.totalSpeed + GPSMain.currentSpeed;
GPSMain.totalKmph = GPSMain.totalKmph + GPSMain.kmphSpeed;
//calculates average speed
GPSMain.avgSpeed = round(GPSMain.totalSpeed/GPSMain.counter,3,BigDecimal.ROUND_HALF_UP);
GPSMain.avgKmph = round(GPSMain.totalKmph/GPSMain.counter,3,BigDecimal.ROUND_HALF_UP);
//gets position
GPSMain.lat = round(((double) (newLocation.getLatitude())),3,BigDecimal.ROUND_HALF_UP);
GPSMain.lon = round(((double) (newLocation.getLongitude())),3,BigDecimal.ROUND_HALF_UP);
GPSMain.run();
}
//not entirely sure what these do yet
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 1, locationListener);
}
//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 void onLocationChanged(Location location) {
// TODO Auto-generated method stub
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
}
UPDATE FOR shababhsiddique
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import android.app.Service;
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.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class Calculations extends Service{
static LocationManager locationManager;
static LocationListener locationListener;
private static long timerTime = 1;
private static float timerFloatValue = 1.0f;
private Context context;
private int counter = 0;
#Override
public IBinder onBind(Intent intent) {return null;}
#Override
public void onCreate() {
context = this;
update();
}
protected void update(){
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);
// Define a listener that responds to location updates
locationListener = new LocationListener() {
public void onLocationChanged(Location newLocation) {
counter++;
if(GPSMain.GPSHasStarted==0){
GPSMain.previousLocation = newLocation;
//gets position
GPSMain.lat = round(((double) (GPSMain.previousLocation.getLatitude())),3,BigDecimal.ROUND_HALF_UP);
GPSMain.lon = round(((double) (GPSMain.previousLocation.getLongitude())),3,BigDecimal.ROUND_HALF_UP);
GPSMain.startingLocation = GPSMain.previousLocation;
GPSMain.routeLat.add(Double.toString(GPSMain.startingLocation.getLatitude()));
GPSMain.routeLon.add(Double.toString(GPSMain.startingLocation.getLongitude()));
GPSMain.startTime = System.currentTimeMillis();
GPSMain.GPSHasStarted++;
Toast.makeText(context, "GPS Connection Established", Toast.LENGTH_LONG).show();
startService(new Intent(context, AccelerometerReader.class));
Toast.makeText(context, "Accelerometer Calculating", Toast.LENGTH_LONG).show();
Toast.makeText(context, "Have A Safe Trip!", Toast.LENGTH_LONG).show();
}
//gets position
GPSMain.lat = round(((double) (newLocation.getLatitude())),3,BigDecimal.ROUND_HALF_UP);
GPSMain.lon = round(((double) (newLocation.getLongitude())),3,BigDecimal.ROUND_HALF_UP);
if (newLocation.distanceTo(GPSMain.previousLocation)>2.0f){
GPSMain.distanceBetweenPoints = GPSMain.distanceBetweenPoints + newLocation.distanceTo(GPSMain.previousLocation);
}
//current speed for the GPS device
GPSMain.mpsSpeed = newLocation.getSpeed();
if (GPSMain.mpsSpeed>GPSMain.topMps) {GPSMain.topMps=GPSMain.mpsSpeed;}
//store location in order to calculate distance during next iteration.
GPSMain.previousLocation = newLocation;
if (counter % 20 == 0){
GPSMain.routeLat.add(Double.toString(GPSMain.previousLocation.getLatitude()));
GPSMain.routeLon.add(Double.toString(GPSMain.previousLocation.getLongitude()));
}
}
//not entirely sure what these do yet
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 20, locationListener);
}
//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();
}
//formats the time taken in milliseconds into hours minutes and seconds
public static String getTimeTaken(long end, long start){
#SuppressWarnings("unused")
String formattedTime = "", hourHour = "", hourMin = ":", minSec = ":";
long timeTaken = end-start, hour = 0, min = 0, sec = 0;
timerTime = timeTaken;
timeTaken = (end-start)/1000;
if (timeTaken>9 ){
hourHour = "0";
hourMin = ":0";
if (timeTaken>=60){
if (timeTaken>= 3200){
hour = timeTaken/3200;
timeTaken = timeTaken%3200;
if (hour>9){
hourHour = "";
}
}
min = timeTaken/60;
timeTaken = timeTaken%60;
if (min >9){
hourMin = ":";
}
}
sec = timeTaken;
if(sec%60<10){
minSec = ":0";
}
return formattedTime = (hourHour+hour+hourMin+min+minSec+sec);
}
sec = timeTaken;
minSec = ":0";
hourMin = ":0";
hourHour = "0";
return formattedTime = (hourHour+hour+hourMin+min+minSec+sec);
}
public static double averageSpeed(){
//calculates average speed
if (timerTime==0){timerTime=1;}
timerFloatValue = (float) timerTime;
timerFloatValue = timerFloatValue/1000;
return GPSMain.avgMps = GPSMain.distanceBetweenPoints/timerFloatValue;
}
//rounds the float values from the accelerometer
static String roundTwoDecimalFloat(float a){
float b = a/9.8f;
String formattedNum;
NumberFormat nf = new DecimalFormat();
nf.setMaximumFractionDigits(2);
nf.setMinimumFractionDigits(2);
formattedNum = nf.format(b);
return formattedNum;
}
}
Question 1: You must acquire a WakeLock . There are multiple types of wakelock, depending if you want only the cpu on or also the screen.
Question 2: You should do your collecting data stuff inside a Service and separate the graphical interface from the collecting data. The Service will continue to collect the data until you stop it if you implement it correctly.