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POAdding custom index to ArrayList or SortedMap when adding overlayitem to ItemizedOverlay
 

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  1. POAdding custom index to ArrayList or SortedMap when adding overlayitem to ItemizedOverlay
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    <p>I'm using ItemizedOverlay to display points of events on a map. My main goal is to be able to find an event that was added earlier so that I can delete (or edit) just it without clearing the whole itemizedOverlay. So I decided to add each event to the ArrayList using its own unique ID as an index.</p> <p>This is the code where I add the event. </p> <pre><code>myItemizedOverlay itemizedOverlay = new MyItemizedOverlay(drawable, mapView); OverlayItem overlayItem = new OverlayItem(geoPoint, title, subtext); itemizedOverlay.addOverlay(overlayItem, event_id); mapOverlays.add(itemizedOverlay); </code></pre> <p>This is the ArrayList and constructor code from myItemizedOverlay class:</p> <pre><code>private ArrayList&lt;OverlayItem&gt; mOverlays = new ArrayList&lt;OverlayItem&gt;(); public void addOverlay(OverlayItem overlay, int event_id) { // **Original** mOverlays.add(overlay); mOverlays.add(event_id, overlay); populate(); } </code></pre> <p>So what I think I'm saying is: add the item OverlayItem 'overlay' to ArrayList mOverlays at position 'event_id' (say, 4).</p> <p>This gives me an error though at the part:</p> <pre><code>mOverlays.add(event_id, overlay); </code></pre> <p>error:</p> <pre><code>05-18 13:17:03.989: E/AndroidRuntime(559): Caused by: java.lang.IndexOutOfBoundsException: Invalid index 4, size is 0 </code></pre> <p>Does anyone know what's going wrong here? Anyway, I know that even if this works, I can't utilize it using ArrayList because upon deleting an event later on (therefore an item in ArrayList) the index of all other items will shift accordingly? Which will mess it up.</p> <p>So I looked it up and found that I should use SortedMap instead:</p> <pre><code>private SortedMap&lt;Integer, OverlayItem&gt; mOverlays = new TreeMap&lt;Integer, OverlayItem&gt;(); </code></pre> <p>So I did, and changed the following line of code to this:</p> <pre><code>mOverlays.put(event_id, overlay); </code></pre> <p>But this gave me errors I could not understand why (see full error below): Specifically, it gave me error at line 42 in myItemizedOverlay:</p> <pre><code>populate(); </code></pre> <p>at line 311 of ItemizedOverlay, which I do not know how to access and see what that line includes, but it obviously has something to do with the populate() error just above.</p> <p>and at line 418 where I had this</p> <pre><code>itemizedOverlay.addOverlay(overlayItem, event_id); </code></pre> <p>Full error:</p> <pre><code>05-18 13:15:16.450: E/AndroidRuntime(524): FATAL EXCEPTION: main 05-18 13:15:16.450: E/AndroidRuntime(524): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cylbs.android/com.cylbs.android.Home}: java.lang.NullPointerException 05-18 13:15:16.450: E/AndroidRuntime(524): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 05-18 13:15:16.450: E/AndroidRuntime(524): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 05-18 13:15:16.450: E/AndroidRuntime(524): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 05-18 13:15:16.450: E/AndroidRuntime(524): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 05-18 13:15:16.450: E/AndroidRuntime(524): at android.os.Handler.dispatchMessage(Handler.java:99) 05-18 13:15:16.450: E/AndroidRuntime(524): at android.os.Looper.loop(Looper.java:130) 05-18 13:15:16.450: E/AndroidRuntime(524): at android.app.ActivityThread.main(ActivityThread.java:3683) 05-18 13:15:16.450: E/AndroidRuntime(524): at java.lang.reflect.Method.invokeNative(Native Method) 05-18 13:15:16.450: E/AndroidRuntime(524): at java.lang.reflect.Method.invoke(Method.java:507) 05-18 13:15:16.450: E/AndroidRuntime(524): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 05-18 13:15:16.450: E/AndroidRuntime(524): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 05-18 13:15:16.450: E/AndroidRuntime(524): at dalvik.system.NativeStart.main(Native Method) 05-18 13:15:16.450: E/AndroidRuntime(524): Caused by: java.lang.NullPointerException 05-18 13:15:16.450: E/AndroidRuntime(524): at com.google.android.maps.ItemizedOverlay.populate(ItemizedOverlay.java:311) 05-18 13:15:16.450: E/AndroidRuntime(524): at com.cylbs.android.MyItemizedOverlay.addOverlay(MyItemizedOverlay.java:42) 05-18 13:15:16.450: E/AndroidRuntime(524): at com.cylbs.android.Home.getEvents(Home.java:418) 05-18 13:15:16.450: E/AndroidRuntime(524): at com.cylbs.android.Home.onCreate(Home.java:128) 05-18 13:15:16.450: E/AndroidRuntime(524): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-18 13:15:16.450: E/AndroidRuntime(524): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) </code></pre>
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