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POMap markers are throwing error while clicking in Android
 

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  1. POMap markers are throwing error while clicking in Android
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    <p>I am making an app which shows google map with 5 connected coordinates. I am able to mark them with an icon. Now i am trying to show a dialog when we click on those markers but i am getting error. Please find the code as below. Any help would be much appreciated.</p> <p>This is my Main class.</p> <pre><code>public class MapConnect extends MapActivity implements LocationListener { private static final String TAG = "LocationActivity"; // public List&lt;Overlay&gt; mapOverlays; // public MyOwnLocationOverlay myLocationOverlay; public static MapConnect instance; public MapView mapView; protected LocationManager locationManager; public Button retrieveLocationButton; Geocoder geocoder; TextView locationText; Location location; MapController mapController; CountDownTimer locationtimer; GeoPoint point1 = new GeoPoint(29391748,13436279); GeoPoint point2 = new GeoPoint(28835050,14128418); GeoPoint point3 = new GeoPoint(28256006,13941650); GeoPoint point4 = new GeoPoint(28401065,13029785); GeoPoint point5 = new GeoPoint(29027355,12546387); // private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters // private static final long MINIMUM_TIME_BETWEEN_UPDATES = 9000; // in Milliseconds // MapOverlay mapOverlay = new MapOverlay(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_map_connect); mapView = (MapView) findViewById(R.id.map_view); MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, mapView); mapView.getOverlays().add(myLocationOverlay); mapView.postInvalidate(); myLocationOverlay.enableMyLocation(); mapView.setBuiltInZoomControls(true); locationText = (TextView)this.findViewById(R.id.lblLocationInfo); mapController = mapView.getController(); mapView.setSatellite(false); mapController.setZoom(8); retrieveLocationButton = (Button) findViewById(R.id.retrieve_location_button); // GeoPoint point1 = new GeoPoint(29391748,13436279); // GeoPoint point2 = new GeoPoint(28835050,14128418); // GeoPoint point3 = new GeoPoint(28256006,13941650); // GeoPoint point4 = new GeoPoint(28401065,13029785); // GeoPoint point5 = new GeoPoint(29027355,12546387); MapOverlay mapOvlay = new MapOverlay(point1, point2,point3,point4,point5); //mapController.setCenter(point4); mapView.getOverlays().add(mapOvlay); List&lt;Overlay&gt; mapOverlays = mapView.getOverlays(); Drawable drawable = this.getResources().getDrawable(R.drawable.pin); HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable); OverlayItem overlayitem = new OverlayItem(point1, null, null); OverlayItem overlayitem1 = new OverlayItem(point2, null, null); OverlayItem overlayitem2 = new OverlayItem(point3, null, null); OverlayItem overlayitem3 = new OverlayItem(point4, null, null); OverlayItem overlayitem4 = new OverlayItem(point5, null, null); itemizedoverlay.addOverlay(overlayitem); itemizedoverlay.addOverlay(overlayitem1); itemizedoverlay.addOverlay(overlayitem2); itemizedoverlay.addOverlay(overlayitem3); itemizedoverlay.addOverlay(overlayitem4); mapOverlays.add(itemizedoverlay); } public class MapOverlay extends com.google.android.maps.Overlay { private GeoPoint mGpt1; private GeoPoint mGpt2; private GeoPoint mGpt3; private GeoPoint mGpt4; private GeoPoint mGpt5; protected MapOverlay(GeoPoint gp1, GeoPoint gp2,GeoPoint gp3,GeoPoint gp4,GeoPoint gp5 ) { mGpt1 = gp1; mGpt2 = gp2; mGpt3 = gp3; mGpt4 = gp4; mGpt5 = gp5; mapController.setCenter(gp3); } @Override public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { super.draw(canvas, mapView, shadow); Paint paint; paint = new Paint(); paint.setColor(Color.RED); paint.setAntiAlias(true); paint.setStyle(Style.STROKE); paint.setStrokeWidth(2); Point pt1 = new Point(); Point pt2 = new Point(); Point pt3 = new Point(); Point pt4 = new Point(); Point pt5 = new Point(); Projection projection = mapView.getProjection(); projection.toPixels(mGpt1, pt1); projection.toPixels(mGpt2, pt2); projection.toPixels(mGpt3, pt3); projection.toPixels(mGpt4, pt4); projection.toPixels(mGpt5, pt5); canvas.drawLine(pt1.x, pt1.y, pt2.x, pt2.y, paint); canvas.drawLine(pt2.x, pt2.y, pt3.x, pt3.y, paint); canvas.drawLine(pt3.x, pt3.y, pt4.x, pt4.y, paint); canvas.drawLine(pt4.x, pt4.y, pt5.x, pt5.y, paint); canvas.drawLine(pt5.x, pt5.y, pt1.x, pt1.y, paint); return true; } } // public void drawMyLocation(Canvas canvas,MapView mapView,location,point,Long 1000); public void showsat(View view){ mapView.setSatellite(true); } public void showcurrentlocation(View view) { // mapView.getOverlays().clear(); // mapOverlays = mapView.getOverlays(); // // myLocationOverlay = new MyOwnLocationOverlay(GMapsActivity.this, mapView); // myLocationOverlay.setMeters(10); // myLocationOverlay.enableCompass(); // myLocationOverlay.enableMyLocation(); // myLocationOverlay.runOnFirstFix(new Runnable() { // public void run() { // mapController.animateTo(myLocationOverlay.getMyLocation()); // } // }); // mapView.getOverlays().add(myLocationOverlay); } mapView.setSatellite(false); geocoder = new Geocoder(MapConnect.this); locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER); // add this overlay to the MapView and refresh it if (location != null) { Log.d(TAG, location.toString()); this.onLocationChanged(location); //&lt;6&gt; } } // @Override public void onBackPressed() { // do something on back. MapOverlay mapOvlay = new MapOverlay(point1, point2,point3,point4,point5); mapView.getOverlays().add(mapOvlay); // finish(); return; } public void finish() { // do something on back. finish(); return; } @Override public void onLocationChanged(Location location) { Log.d(TAG, "onLocationChanged with location " + location.toString()); String text = String.format("Lat:\t %f\nLong:\t %f\nAlt:\t %f\nBearing:\t %f", location.getLatitude(),location.getLongitude(), location.getAltitude(), location.getBearing()); this.locationText.setText(text); try { List&lt;Address&gt; addresses = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 10); //&lt;10&gt; for (Address address : addresses) { this.locationText.append("\n" + address.getAddressLine(0)); } int latitude = (int)(location.getLatitude() * 1000000); int longitude = (int)(location.getLongitude() * 1000000); GeoPoint point = new GeoPoint(latitude,longitude); mapController.animateTo(point); //&lt;11&gt; } catch (IOException e) { Log.e("LocateMe", "Could not get Geocoder data", e); } // } @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 protected void onResume() { // LocationListener locationListener = new LocationListener(){ // super.onResume(); // locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 10, this); //&lt;7&gt; // } // @Override protected void onPause() { // super.onPause(); // locationManager.removeUpdates(this); //&lt;8&gt; // // } //@Override //protected void onResume() { // super.onResume(); // // // when our activity resumes, we want to register for location updates // // // myLocationOverlay.enableMyLocation(); // //} // //@Override //protected void onPause() { // super.onPause(); // // // when our activity pauses, we want to remove listening for location updates // // myLocationOverlay.disableMyLocation(); // //} @Override protected boolean isRouteDisplayed() { return false; } } </code></pre> <p>Now the Itemized Overlay class:</p> <pre><code>public class HelloItemizedOverlay extends ItemizedOverlay { private ArrayList&lt;OverlayItem&gt; mOverlays = new ArrayList&lt;OverlayItem&gt;(); private Context mContext; public HelloItemizedOverlay(Drawable defaultMarker) { super(boundCenterBottom(defaultMarker)); } public void addOverlay(OverlayItem overlay) { mOverlays.add(overlay); populate(); } @Override protected OverlayItem createItem(int i) { return mOverlays.get(i); } @Override public int size() { return mOverlays.size(); } // @Override // protected boolean onTap(int index) { // AlertDialog.Builder dialog = new AlertDialog.Builder(MapConnect.instance); // switch (index) { // case 0: // Toast.makeText(MapConnect.instance, "GeoLocation : 0", // Toast.LENGTH_LONG).show(); // dialog.show(); // break; // } // // return true; // } @Override protected boolean onTap(final int index) { final OverlayItem id = mOverlays.get(index); AlertDialog.Builder dialog = new AlertDialog.Builder(MapConnect.instance); dialog.setTitle("your title"); dialog.setMessage("youmessage"); //dialog.setNegativeButton("Cancel", null); dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int index) { dialog.dismiss(); } }); dialog.show(); return true; } } </code></pre> <p>This is the Logcat error i am getting:</p> <pre><code>2-06 07:17:34.822: E/InputEventReceiver(6112): Exception dispatching input event. 02-06 07:17:34.822: E/MessageQueue-JNI(6112): Exception in MessageQueue callback: handleReceiveCallback 02-06 07:17:34.893: E/MessageQueue-JNI(6112): java.lang.NullPointerException 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.app.AlertDialog$Builder.&lt;init&gt;(AlertDialog.java:360) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at com.example.mapconnect.HelloItemizedOverlay.onTap(HelloItemizedOverlay.java:58) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at com.google.android.maps.ItemizedOverlay.onTap(ItemizedOverlay.java:453) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at com.google.android.maps.OverlayBundle.onTap(OverlayBundle.java:83) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at com.google.android.maps.MapView$1.onSingleTapUp(MapView.java:358) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at com.google.android.maps.GestureDetector.onTouchEvent(GestureDetector.java:562) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at com.google.android.maps.MapView.onTouchEvent(MapView.java:685) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.View.dispatchTouchEvent(View.java:7239) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2168) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1903) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2174) 02-06 07:17:34.893: E/MessageQueue-JNI(6112): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917) </code></pre>
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    1. USmanishpro
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    1. COLook down the exception for the first line that references your code. What's here? `at com.example.mapconnect.HelloItemizedOverlay.onTap(HelloItemizedOverlay.java:58)`
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      1. POMap markers are throwing error while clicking in Android
      1. USSimon
 

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