Question

In my Top Half of the Android Screen, I am showing Google Map and in the Bottom Half of the Android Screen, I am showing TextBox.

Problem Statement-

As currently I am showing google map on the top half of the Android Screen, so whole google map is getting shown on the Top Half of the Android Screen but I need to focus my Current Location on the Top Half of the Android Screen with the image current_user.png that I have in my drawable folder. So question here is-

1. Show the Current Location with the image current_user.png on the Top Half of the Android Screen.

Below is my Java Code that I am using to show the current location on Top Half of the Android Screen. But it is giving me exception and my application is getting forced closed every time. Is there anything wrong I am doing here?

public class MainActivity extends MapActivity {    
public static final String TAG = "GoogleMapsActivity";
private MapView mapView;
private LocationManager locationManager;
Geocoder geocoder;
Location location;
LocationListener locationListener;
CountDownTimer locationtimer;
MapController mapController;
MapOverlay mapOverlay = new MapOverlay();



/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.activity_main);
    initComponents();
    mapView.setBuiltInZoomControls(true);
    mapView.setSatellite(true);
    mapController = mapView.getController();
    mapController.setZoom(16);
    locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
    if (locationManager == null) {
        Toast.makeText(getApplicationContext(),
                "Location Manager Not Available", Toast.LENGTH_SHORT)
                .show();
        return;
    }
    location = locationManager
    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
    if (location == null)
        location = locationManager
        .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
    if (location != null) {
        double lat = location.getLatitude();
        double lng = location.getLongitude();
        Toast.makeText(getApplicationContext(),
                "Location Are" + lat + ":" + lng, Toast.LENGTH_SHORT)
                .show();
        GeoPoint point = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
        mapController.animateTo(point, new Message());
        mapOverlay.setPointToDraw(point);
        List<Overlay> listOfOverlays = mapView.getOverlays();
        listOfOverlays.clear();
        listOfOverlays.add(mapOverlay);
    }
    locationListener = new LocationListener() {
        @Override
        public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
        }

        @Override
        public void onProviderEnabled(String arg0) {
        }

        @Override
        public void onProviderDisabled(String arg0) {
        }

        @Override
        public void onLocationChanged(Location l) {
            location = l;
            locationManager.removeUpdates(this);
            if (l.getLatitude() == 0 || l.getLongitude() == 0) {
            } else {
                double lat = l.getLatitude();
                double lng = l.getLongitude();
                Toast.makeText(getApplicationContext(),
                        "Location Are" + lat + ":" + lng,
                        Toast.LENGTH_SHORT).show();
            }
        }
    };
    if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
        locationManager.requestLocationUpdates(
                LocationManager.GPS_PROVIDER, 1000, 10f, locationListener);
    locationManager.requestLocationUpdates(
            LocationManager.NETWORK_PROVIDER, 1000, 10f, locationListener);
    locationtimer = new CountDownTimer(30000, 5000) {
        @Override
        public void onTick(long millisUntilFinished) {
            if (location != null)
                locationtimer.cancel();
        }

        @Override
        public void onFinish() {
            if (location == null) {
            }
        }
    };
    locationtimer.start();
}

public MapView getMapView() {
    return this.mapView;
}

private void initComponents() {
    mapView = (MapView) findViewById(R.id.mapView);
}

@Override
protected boolean isRouteDisplayed() {
    return false;
}

class MapOverlay extends Overlay {
    private GeoPoint pointToDraw;

    public void setPointToDraw(GeoPoint point) {
        pointToDraw = point;
    }

    public GeoPoint getPointToDraw() {
        return pointToDraw;
    }

    @Override
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
            long when) {
        super.draw(canvas, mapView, shadow);

        Point screenPts = new Point();
        mapView.getProjection().toPixels(pointToDraw, screenPts);

        Bitmap bmp = BitmapFactory.decodeResource(getResources(),
                R.drawable.current_user);
        canvas.drawBitmap(bmp, screenPts.x, screenPts.y - 24, null);
        return true;
    }
}

}

Below is my XML file

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <com.google.android.maps.MapView 
        android:id="@+id/mapView" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        android:layout_weight="1" 
        android:apiKey="0vAX8Xe9xjo5gkFNEEIH7KdHkNZNJWNnsjUPKkQ" 
        android:clickable="true" 
        android:enabled="true" /> 

    <TextView 
        android:id="@+id/textView" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        android:layout_weight="1" 
        android:text="TextView" /> 

</LinearLayout> 

Exception I am getting-

java.lang.RuntimeException: Unable to start activity 
ComponentInfo{com.example.circlemapandroid/com.example.circlemapandroid.MainActivity}: 
java.lang.IllegalArgumentException: requested provider network doesn't exisit

Answer 1

You have to check if network provider is enabled like you did with the GPS provider:

if (locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){
    locationManager.requestLocationUpdates(
        LocationManager.NETWORK_PROVIDER, 1000, 10f, locationListener);
}

Also the following permission have to be present in your manifest:

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>