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POPositions in ArrayLists
 

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  1. POPositions in ArrayLists
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    <p>My code is not working like I thought it should. The list <code>listColumn0</code> contains the X and Y positions for 8 sprite objects on the screen. When I touch on one of them I check witch sprite object that match that X and Y position and then remove it from the list. But the strange thing is that this only works if I first touch on the last sprite object with index 7 and if I then continue with sprite object with index 6 and so on.</p> <p>If I click on, let's say, sprite object with index 3 or some of the other besides the last, then the app is closing down! Why this? Can someone see what I have done wrong or can I do this in a better way? Is there a better way to detect/match which sprite object I have touched?</p> <pre><code> String size = Integer.toString(listColumn0.size()); // Check all lists for(ColorObject colorObject: listColumn0) { if(x &gt; (colorObject.xPosition - colorObject.radius) &amp;&amp; x &lt; (colorObject.xPosition + colorObject.radius) &amp;&amp; y &gt; (colorObject.yPosition - colorObject.radius) &amp;&amp; y &lt; (colorObject.yPosition + colorObject.radius)) { String colorCode = Integer.toString(colorObject.color); String index = Integer.toString(listColumn0.indexOf(colorObject)); Log.i("Test","Match!! " + size + " Color: " + colorCode + "ID: " + index); listColumn0.remove(listColumn0.indexOf(colorObject)); } } </code></pre> <p><strong>EDIT:</strong></p> <p>Eror message from LogCat:</p> <pre><code>05-22 07:08:55.482: W/dalvikvm(1444): threadid=12: thread exiting with uncaught exception (group=0x40a13300) 05-22 07:08:55.482: E/AndroidRuntime(1444): FATAL EXCEPTION: Thread-124 05-22 07:08:55.482: E/AndroidRuntime(1444): java.util.ConcurrentModificationException 05-22 07:08:55.482: E/AndroidRuntime(1444): at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:569) 05-22 07:08:55.482: E/AndroidRuntime(1444): at com.test.game.ColorObjectManager.checkPosition(ColorObjectManager.java:164) 05-22 07:08:55.482: E/AndroidRuntime(1444): at com.test.game.GameLoop.run(GameLoop.java:190) 05-22 07:08:55.482: E/AndroidRuntime(1444): at java.lang.Thread.run(Thread.java:856) 05-22 07:13:55.753: I/Process(1444): Sending signal. PID: 1444 SIG: 9 </code></pre>
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    1. PO
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    1. This table or related slice is empty.
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    1. USShruti
    1. US3D-kreativ
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    2. PL
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    2. PO
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    1. This table or related slice is empty.
    1. COExpand "the app is closing down". Do you get any error messages? Stack traces? The ANR dialog?
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      1. POPositions in ArrayLists
      1. USDek Dekku
 

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