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POgetting null pointer exception in android map while getting direction between two points
 

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  1. POgetting null pointer exception in android map while getting direction between two points
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    <p>I've been following <a href="http://about-android.blogspot.in/2010/03/sample-google-map-driving-direction.html" rel="nofollow">this</a> tutorial.</p> <p>I got a null pointer at <code>doc = (Document) urlConnection.getInputStream();</code>.</p> <p>Here is my code:</p> <pre><code>public class DirectionActivity extends MapActivity { MapView myMapView = null; MapController myMC = null; GeoPoint geoPoint = null; DocumentBuilderFactory dbf; DocumentBuilder db; Document doc; HttpURLConnection urlConnection ; URL url ; String pathConent ; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); myMapView = (MapView) findViewById(R.id.mapview1); geoPoint = null; myMapView.setSatellite(false); String pairs[] = getDirectionData("Ahmedabad", "Goa"); String[] lngLat = pairs[0].split(","); // STARTING POINT GeoPoint startGP = new GeoPoint( (int) (Double.parseDouble(lngLat[1]) * 1E6), (int) (Double .parseDouble(lngLat[0]) * 1E6)); myMC = myMapView.getController(); geoPoint = startGP; myMC.setCenter(geoPoint); myMC.setZoom(15); myMapView.getOverlays().add(new DirectionPathOverlay(startGP, startGP)); // NAVIGATE THE PATH GeoPoint gp1; GeoPoint gp2 = startGP; for (int i = 1; i &lt; pairs.length; i++) { lngLat = pairs[i].split(","); gp1 = gp2; // watch out! For GeoPoint, first:latitude, second:longitude gp2 = new GeoPoint((int) (Double.parseDouble(lngLat[1]) * 1E6), (int) (Double.parseDouble(lngLat[0]) * 1E6)); myMapView.getOverlays().add(new DirectionPathOverlay(gp1, gp2)); Log.d("xxx", "pair:" + pairs[i]); } // END POINT myMapView.getOverlays().add(new DirectionPathOverlay(gp2, gp2)); myMapView.getController().animateTo(startGP); myMapView.setBuiltInZoomControls(true); myMapView.displayZoomControls(true); } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } private String[] getDirectionData(String srcPlace, String destPlace) { String urlString = "http://maps.google.com/maps?f=d&amp;hl=en&amp;saddr=" + srcPlace + "&amp;daddr=" + destPlace + "&amp;ie=UTF8&amp;0&amp;om=0&amp;output=kml"; Log.d("URL", urlString); try { url = new URL(urlString.toString()); urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setRequestMethod("GET"); urlConnection.setDoOutput(true); urlConnection.setDoInput(true); urlConnection.connect(); dbf = DocumentBuilderFactory.newInstance(); try { db = dbf.newDocumentBuilder(); } catch (ParserConfigurationException e) { // TODO Auto-generated catch block e.printStackTrace(); } ***doc = (Document) urlConnection.getInputStream();***(getting doc=null) } catch (Exception e) { } NodeList nl = doc.getElementsByTagName("LineString"); for (int s = 0; s &lt; nl.getLength(); s++) { Node rootNode = nl.item(s); NodeList configItems = rootNode.getChildNodes(); for (int x = 0; x &lt; configItems.getLength(); x++) { Node lineStringNode = configItems.item(x); NodeList path = lineStringNode.getChildNodes(); pathConent = path.item(0).getNodeValue(); } } String[] tempContent = pathConent.split(" "); return tempContent; } public class DirectionPathOverlay extends Overlay { private GeoPoint gp1; private GeoPoint gp2; public DirectionPathOverlay(GeoPoint gp1, GeoPoint gp2) { this.gp1 = gp1; this.gp2 = gp2; } @Override public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) { // TODO Auto-generated method stub Projection projection = mapView.getProjection(); if (shadow == false) { Paint paint = new Paint(); paint.setAntiAlias(true); Point point = new Point(); projection.toPixels(gp1, point); paint.setColor(Color.BLUE); Point point2 = new Point(); projection.toPixels(gp2, point2); paint.setStrokeWidth(2); canvas.drawLine((float) point.x, (float) point.y, (float) point2.x, (float) point2.y, paint); } return super.draw(canvas, mapView, shadow, when); } @Override public void draw(Canvas canvas, MapView mapView, boolean shadow) { // TODO Auto-generated method stub super.draw(canvas, mapView, shadow); } } } </code></pre> <p>Here is Logcat:</p> <pre><code>01-03 10:56:33.447: E/AndroidRuntime(1018): FATAL EXCEPTION: main 01-03 10:56:33.447: E/AndroidRuntime(1018): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.itsmyway/com.example.itsmyway.DirectionActivity}: java.lang.NullPointerException 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.app.ActivityThread.access$600(ActivityThread.java:130) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.os.Handler.dispatchMessage(Handler.java:99) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.os.Looper.loop(Looper.java:137) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.app.ActivityThread.main(ActivityThread.java:4745) 01-03 10:56:33.447: E/AndroidRuntime(1018): at java.lang.reflect.Method.invokeNative(Native Method) 01-03 10:56:33.447: E/AndroidRuntime(1018): at java.lang.reflect.Method.invoke(Method.java:511) 01-03 10:56:33.447: E/AndroidRuntime(1018): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 01-03 10:56:33.447: E/AndroidRuntime(1018): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 01-03 10:56:33.447: E/AndroidRuntime(1018): at dalvik.system.NativeStart.main(Native Method) 01-03 10:56:33.447: E/AndroidRuntime(1018): Caused by: java.lang.NullPointerException 01-03 10:56:33.447: E/AndroidRuntime(1018): at com.example.itsmyway.DirectionActivity.getDirectionData(DirectionActivity.java:109) 01-03 10:56:33.447: E/AndroidRuntime(1018): at com.example.itsmyway.DirectionActivity.onCreate(DirectionActivity.java:41) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.app.Activity.performCreate(Activity.java:5008) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 01-03 10:56:33.447: E/AndroidRuntime(1018): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 01-03 10:56:33.447: E/AndroidRuntime(1018): ... 11 more </code></pre>
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