gps working in emulator but not working in mobile

Question

hi working with simple android application that shows address of the user but this app is working in emulator well but when i install it in mobile its showing force close.please help me thanks in advance

 package com.gps.com;
    import java.io.IOException;
    import java.util.List;
import java.util.Locale;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class main extends Activity {

    private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters
    private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in Milliseconds

    protected LocationManager locationManager;

    protected Button retrieveLocationButton;
    public Location location;
    public TextView tv;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        retrieveLocationButton = (Button) findViewById(R.id.retrieve_location_button);
         tv= (TextView)findViewById(R.id.tv);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        locationManager.requestLocationUpdates(
                LocationManager.GPS_PROVIDER, 
                MINIMUM_TIME_BETWEEN_UPDATES, 
                MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,
                new MyLocationListener()
        );
        retrieveLocationButton.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                showCurrentLocation();

            }
        });


    }    

    public void showCurrentLocation() {

        Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

        if (location != null) {
            String message = String.format(
                    "Current Location \n Longitude: %1$s \n Latitude: %2$s",
                    location.getLongitude(), location.getLatitude()
            );
            Toast.makeText(main.this, message,
                    Toast.LENGTH_LONG).show();
        }
        try {
            List<Address> addresses;

            Geocoder gc = new Geocoder(this, Locale.ENGLISH); 
            addresses = gc.getFromLocation(location.getLatitude(),location.getLongitude(), 1); 
            if(addresses != null) {
            Address currentAddr = addresses.get(0);
            StringBuilder sb = new StringBuilder("Address:\n"); 
            for(int i=0; i<currentAddr.getMaxAddressLineIndex(); i++) {
            sb.append(currentAddr.getAddressLine(i)).append("\n"); 
            }
            tv.setText(sb.toString()); 
            }
            } catch(IOException e) { 
            tv.setText("Something is mistake the error is"+e);
            }

    }   

    private class MyLocationListener implements LocationListener {

        public void onLocationChanged(Location location) {
            String message = String.format(
                    "New Location \n Longitude: %1$s \n Latitude: %2$s",
                    location.getLongitude(), location.getLatitude()
            );
            Toast.makeText(main.this, message, Toast.LENGTH_LONG).show();
        }

        public void onStatusChanged(String s, int i, Bundle b) {
            Toast.makeText(main.this, "Provider status changed",
                    Toast.LENGTH_LONG).show();
        }

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

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

    }


}

Answer 1

Im also had same problem. Try this code inside manifest.xml. It working for me.

MainActivity:

public class WhereIActivity extends MapActivity {


      // MapController mc;
       MapView myMapView;
       MapController mapController;
       GeoPoint point;
       MyPositionOverlay positionOverlay;



    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_where_i);

        MapView myMapView=(MapView)findViewById(R.id.myMapView);

        mapController=myMapView.getController();


       myMapView.displayZoomControls(false);

       mapController.setZoom(17);

       positionOverlay=new MyPositionOverlay();
       List<Overlay> overlays=myMapView.getOverlays();
       overlays.add(positionOverlay);

      // myMapView.setSatellite(true);

       myMapView.setStreetView(true);
       myMapView.setTraffic(true);





        LocationManager locationManager; 
        String context = Context.LOCATION_SERVICE; 
        locationManager = (LocationManager)getSystemService(context); 

        Criteria crta = new Criteria(); 
        crta.setAccuracy(Criteria.ACCURACY_FINE); 
        crta.setAltitudeRequired(false); 
        crta.setBearingRequired(false); 
        crta.setCostAllowed(true); 
        crta.setPowerRequirement(Criteria.POWER_LOW); 
        String provider = locationManager.getBestProvider(crta, true); 

     // String provider = LocationManager.GPS_PROVIDER; 
        Location location = locationManager.getLastKnownLocation(provider); 
        updateWithNewLocation(location); 

        locationManager.requestLocationUpdates(provider, 2000, 10, locationListener); 
        } 
    private final LocationListener locationListener = new LocationListener() 
    { 

    @Override 
    public void onLocationChanged(Location location) { 
    updateWithNewLocation(location); 
    } 

    @Override 
    public void onProviderDisabled(String provider) { 
    updateWithNewLocation(null); 
    } 

    @Override 
    public void onProviderEnabled(String provider) { 
    } 

    @Override 
    public void onStatusChanged(String provider, int status, Bundle extras) { 
    } 

    }; 

    private void updateWithNewLocation(Location location) { 
        String latLong;
        TextView myLocation; 
        myLocation = (TextView) findViewById(R.id.myLocation); 

        String addressString = "no address found"; 

        if(location!=null) { 



            positionOverlay.setLocation(location);


            Double geoLat=location.getLatitude()*1E6;
            Double geoLng=location.getLongitude()*1E6;
            GeoPoint point=new GeoPoint(geoLat.intValue(),geoLng.intValue());

            mapController.animateTo(point);

        double lat = location.getLatitude(); 
        double lon = location.getLongitude(); 
        latLong = "Lat:" + lat + "\nLong:" + lon; 



        double lattitude = location.getLatitude(); 
        double longitude = location.getLongitude(); 

        Geocoder gc = new Geocoder(this,Locale.getDefault()); 
        try { 
        List<Address> addresses= gc.getFromLocation(lattitude, longitude, 1); 
        StringBuilder sb = new StringBuilder(); 
        if(addresses.size()>0) { 
        Address address=addresses.get(0);
        for(int i=0;i<address.getMaxAddressLineIndex();i++)
            sb.append(address.getAddressLine(i)).append("\n");
        sb.append(address.getLocality()).append("\n"); 
        sb.append(address.getPostalCode()).append("\n"); 
    sb.append(address.getCountryName()); 
    } 
        addressString = sb.toString(); 
        } 
        catch (Exception e) { 
        } 
        } else { 
        latLong = " NO Location Found "; 
        } 

        myLocation.setText("Current Position is :\n"+ latLong + "\n"+  addressString ); 
           }

MyPositionOverlay:

public class MyPositionOverlay extends Overlay {

    Location location;
    private final int mRadius=5;

    @Override
    public void draw(Canvas canvas,MapView mapView,boolean shadow){

        Projection projection=mapView.getProjection();

        if(shadow==false){
            Double latitude=location.getLatitude()*1E6;
            Double longitude=location.getLongitude()*1E6;

            GeoPoint geoPoint;
             geoPoint=new GeoPoint(latitude.intValue(),longitude.intValue());

             Point point=new Point();
             projection.toPixels(geoPoint, point);

             RectF oval=new RectF(point.x - mRadius,point.y - mRadius,point.x + mRadius,point.y + mRadius);

             Paint paint=new Paint();
             paint.setARGB(250, 255, 255, 255);

             paint.setAntiAlias(true);
             paint.setFakeBoldText(true);

             Paint backPaint=new Paint();
             backPaint.setARGB(175, 50, 50, 50);
             backPaint.setAntiAlias(true);

             RectF backRect=new RectF(point.x + 2 + mRadius, point.y - 3*mRadius,point.x + 65, point.y + mRadius);

             canvas.drawOval(oval, paint);
             canvas.drawRoundRect(backRect, 5, 5, backPaint);
             canvas.drawText("Here I Am", point.x + 2*mRadius, point.y, paint);
        }
        super.draw(canvas, mapView, shadow);


        }

    @Override
    public boolean onTap(GeoPoint point,MapView mapView){


            return false;
            }


public Location getLocation(){

    return location;

}
public void setLocation(Location location){
    this.location=location;
}
}

Main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context=".WhereIActivity" >

    <com.google.android.maps.MapView
        android:id="@+id/myMapView"
                 android:layout_width="fill_parent"
                 android:layout_height="fill_parent"
                 android:enabled="true"
                 android:clickable="true"                
                  android:apiKey="0_MW1zfGUXAZ2cAEBaB62GeWv0FoZODowBf1WYg"
          />

    <TextView
        android:id="@+id/myLocation"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"

        tools:context=".WhereIActivity"

        android:gravity="center_horizontal"

         android:textStyle="bold"
        android:textSize="14sp"
        android:typeface="sans"
        android:textColor="#0099CC"

                 android:layout_alignParentTop="true"     

         />    

</RelativeLayout>

manifest.xml:

    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.wherei"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="4"
        android:targetSdkVersion="15" />


    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <uses-library android:name="com.google.android.maps"></uses-library>      
          <activity
            android:name=".WhereIActivity"
            android:label="@string/title_activity_where_i" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />       
<uses-permission android:name="android.permission.INTERNET" />     
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
</manifest>

Answer 2

It's also an obvious suggestion, but you can't turn GPS on programmatically, you have to do that manually. Have you verified that GPS is turned on in your phone??

Answer 3

This line

addresses = gc.getFromLocation(location.getLatitude(),location.getLongitude(), 1);

could give you a Nullpointer Exception, because its outside of the if-block, which is unhandled, as you are only catching IOException in that specific try-block. This might not be the solution to the problem you are having, but I thought I'd point it out anyway.