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PONull Pointer when Using Itemized Overlay in Android
 

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  1. PONull Pointer when Using Itemized Overlay in Android
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    <p>Hello I am trying to plot a array of lattitude and longitude on Maps using itemized overlay. I am getting the following error .what could be the problem..????</p> <p>></p> <pre><code> 03-18 23:52:06.834: W/dalvikvm(2949): threadid=1: thread exiting with uncaught exception (group=0x40b01428) 03-18 23:52:06.844: E/AndroidRuntime(2949): FATAL EXCEPTION: main 03-18 23:52:06.844: E/AndroidRuntime(2949): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rahul.besttracker/com.rahul.besttracker.Mapview}: java.lang.NullPointerException 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.app.ActivityThread.access$600(ActivityThread.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.app.ActivityThread$H.handleMessage(ActivityThread.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.os.Handler.dispatchMessage(Handler.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.os.Looper.loop(Looper.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.app.ActivityThread.main(ActivityThread.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at java.lang.reflect.Method.invokeNative(Native Method) 03-18 23:52:06.844: E/AndroidRuntime(2949): at java.lang.reflect.Method.invoke(Method.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at dalvik.system.NativeStart.main(Native Method) 03-18 23:52:06.844: E/AndroidRuntime(2949): Caused by: java.lang.NullPointerException 03-18 23:52:06.844: E/AndroidRuntime(2949): at com.google.android.maps.ItemizedOverlay.populate(ItemizedOverlay.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at com.rahul.besttracker.HelloItemizedOverlay.addOverlay(HelloItemizedOverlay.java:37) 03-18 23:52:06.844: E/AndroidRuntime(2949): at com.rahul.besttracker.Mapview.onCreate(Mapview.java:56) 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.app.Activity.performCreate(Activity.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java) 03-18 23:52:06.844: E/AndroidRuntime(2949): ... 12 more 03-18 23:52:07.935: D/Process(2949): killProcess, pid=2949 </code></pre> <p>Here is my HelloItemizedOverlay Class </p> <pre><code>package com.rahul.besttracker; import java.util.ArrayList; import android.app.AlertDialog; import android.content.Context; import android.graphics.drawable.Drawable; import com.google.android.maps.ItemizedOverlay; import com.google.android.maps.OverlayItem; public class HelloItemizedOverlay extends ItemizedOverlay { private ArrayList&lt;OverlayItem&gt; mOverlays = new ArrayList&lt;OverlayItem&gt;(); Context mContext; public HelloItemizedOverlay(Drawable defaultMarker) { super(boundCenterBottom(defaultMarker)); // TODO Auto-generated constructor stub } public HelloItemizedOverlay(Drawable defaultMarker, Context context) { super(boundCenterBottom(defaultMarker)); mContext = context; } @Override protected OverlayItem createItem(int i) { return mOverlays.get(i); } @Override public int size() { return mOverlays.size(); } public void addOverlay(OverlayItem overlay) { mOverlays.add(overlay); populate(); &lt;--------------GETTING ERROR HERE } @Override protected boolean onTap(int index) { OverlayItem item = mOverlays.get(index); AlertDialog.Builder dialog = new AlertDialog.Builder(mContext); dialog.setTitle(item.getTitle()); dialog.setMessage(item.getSnippet()); dialog.show(); return true; } } </code></pre> <p>ANd here is my MapView Class</p> <pre><code>package com.rahul.besttracker; import java.util.ArrayList; import java.util.List; import com.google.android.maps.GeoPoint; import com.google.android.maps.MapActivity; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; import com.google.android.maps.OverlayItem; import android.graphics.drawable.Drawable; import android.os.Bundle; public class Mapview extends MapActivity { MapView map; ArrayList&lt;String&gt; mArrayList; double[] Lat; double[] Lon; String stops[]; int latarr[], lonarr[]; OverlayItem overlayitem; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.maps); map = (MapView) findViewById(R.id.Map); // map.setBuiltInZoomControls(true); // setContentView(R.layout.maps); Bundle gotBasket = getIntent().getExtras(); mArrayList = gotBasket.getStringArrayList("stops"); Lat = gotBasket.getDoubleArray("Lat"); Lon = gotBasket.getDoubleArray("Lon"); System.out.println("SIZE+++" + Lat.length + " " + Lon.length); for (int i = 0; i &lt; mArrayList.size(); i++) { System.out.println(" \n" + Lat[i] + "\t" + Lon[i]); } // stops=(String[]) mArrayList.toArray(); List&lt;Overlay&gt; mapOverlays = map.getOverlays(); Drawable drawable = this.getResources().getDrawable( R.drawable.mark_blue); HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay( drawable, this); for (int i = 0; i &lt; mArrayList.size(); i++) { if (Lat[i] &gt; 0 &amp;&amp; Lon[i] &gt; 0) { GeoPoint point = new GeoPoint((int) (Lat[i] * 1E6), (int) (Lon[i] * 1E6)); overlayitem = new OverlayItem(point, mArrayList.get(i), null); } itemizedoverlay.addOverlay(overlayitem); mapOverlays.add(itemizedoverlay); } } @Override protected boolean isRouteDisplayed() { // TODO Auto-generated method stub return false; } </code></pre> <p>}</p>
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    1. This table or related slice is empty.
    1. PTQuestion
    1. USRahul Mehrotra
    1. USRahul Mehrotra
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

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