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POAndroid - setVisibility results in java.util.ConcurrentModificationException
 

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  1. POAndroid - setVisibility results in java.util.ConcurrentModificationException
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    <p>I am hiding a view via <code>setVisibility(View.INVISIBLE)</code>. Later on when I try to show the view again in a different method via <code>setVisibility(View.VISIBLE)</code> I get the following exception</p> <pre><code>03-28 01:32:05.450: E/AndroidRuntime(20895): FATAL EXCEPTION: main 03-28 01:32:05.450: E/AndroidRuntime(20895): java.util.ConcurrentModificationException 03-28 01:32:05.450: E/AndroidRuntime(20895): at java.util.HashMap$HashIterator.nextEntry(HashMap.java:796) 03-28 01:32:05.450: E/AndroidRuntime(20895): at java.util.HashMap$KeyIterator.next(HashMap.java:823) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:946) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:948) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:948) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:948) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:948) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:948) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.view.ViewRoot.handleDragEvent(ViewRoot.java:3027) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.view.ViewRoot.handleMessage(ViewRoot.java:2185) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.os.Handler.dispatchMessage(Handler.java:99) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.os.Looper.loop(Looper.java:132) 03-28 01:32:05.450: E/AndroidRuntime(20895): at android.app.ActivityThread.main(ActivityThread.java:4028) 03-28 01:32:05.450: E/AndroidRuntime(20895): at java.lang.reflect.Method.invokeNative(Native Method) 03-28 01:32:05.450: E/AndroidRuntime(20895): at java.lang.reflect.Method.invoke(Method.java:491) 03-28 01:32:05.450: E/AndroidRuntime(20895): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:844) 03-28 01:32:05.450: E/AndroidRuntime(20895): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602) 03-28 01:32:05.450: E/AndroidRuntime(20895): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>When I comment out the line that changes the visibility back to visible, I don't get the exception.</p> <p>I first thought that the exception would be caused by some other code iterating through a hashmap, however, I don't do any modifications while iterating through the hashmaps I use, neither do I have multithreading, which seem to be the most common reason for this exception. Also I don't get the exception when I don't change back the visibility.</p> <p><strong>EDIT</strong>:<br> The exception occurs in a custom fragment. Below is the code where I iterate over the hashmap (<code>mWidgetConfig</code>) that contains information about the configuration of custom widgets that I am trying to restore. The hashmap is a public variable in the fragment.</p> <p>In an <code>OnDragListener</code> which is created by the fragment, I update the hashmap according to a certain drag operation, like this:</p> <pre><code>// Update the widget configuration of the fragment that created this listener mFragment.mWidgetConfig.put(startCircleTag, "0"); </code></pre> <p>I also iterate over the hashmap to check a certain condition but I don't do any modification during the iteration:</p> <pre><code>Iterator&lt;String&gt; keySetItr = mFragment.mWidgetConfig.keySet().iterator(); while(keySetItr.hasNext()) { String tag = keySetItr.next(); if(mFragment.mWidgetConfig.get(tag).equals((String) destSocket.getTag())) { // do something, though no modification of the hashmap break; } } </code></pre> <p>In addition I do one iteration in the fragment itself while trying to restore the widget configuration. Below is the code I use to configure the widget according to the hashmap:</p> <pre><code> public void configureWidgets() { resetWidgets(); Iterator&lt;String&gt; keySetItr = mWidgetConfig.keySet().iterator(); while(keySetItr.hasNext()) { String tag = keySetItr.next(); Integer value = Integer.parseInt(mWidgetConfig.get(tag)); ImageView destSocket = null; switch(value) { case 0: // The circle will not be connected to any socket continue; case 1: destSocket = mSocket1; break; case 2: destSocket = mSocket2; break; case 3: destSocket = mSocket3; break; } ImageView startCircle = (ImageView) mLayout.findViewWithTag(tag); ImageView startPlug = (ImageView) mLayout.findViewWithTag(tag + "_plug"); // Replace the drawable of destSocket destSocket.setBackgroundDrawable(getActivity().getResources().getDrawable(R.drawable.socket_plugged)); // Hide plug view startPlug.setVisibility(View.INVISIBLE); // Draw a line between the start circle view and the destination socket view mConnectionLinesView.addLine(startCircle, destSocket); } } public void resetWidgets() { // Remove all lines mConnectionLinesView.removeLines(); // Show all eventually previously hidden plugs //mPlug1.setVisibility(View.VISIBLE); //mPlug2.setVisibility(View.VISIBLE); //mPlug3.setVisibility(View.VISIBLE); // Set to backround drawable of the socket to the initial one mSocket1.setBackgroundDrawable(getActivity().getResources().getDrawable(R.drawable.socket).mutate()); mSocket2.setBackgroundDrawable(getActivity().getResources().getDrawable(R.drawable.socket).mutate()); mSocket3.setBackgroundDrawable(getActivity().getResources().getDrawable(R.drawable.socket).mutate()); } </code></pre> <p>As soon as the lines that set the visibility of the "plugs" above are used in the code, I get the exception.</p> <p><strong>SOLUTION</strong><br> The reason the exception got thrown is that I called the configuration methods in the <code>DragEvent.ACTION_DRAG_ENDED</code> case statement of the <code>OnDragListener</code>. When I put the same code into the <code>DragEvent.ACTION_DROP</code> case statement the exception doesn't get thrown. No clue why. Thanks for your help guys</p>
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    1. USSchnodahipfe
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      1. POAndroid - setVisibility results in java.util.ConcurrentModificationException
      1. USJim Corriveau
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    1. COpost your code for iterating hashmap ...and its create this exception
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      1. POAndroid - setVisibility results in java.util.ConcurrentModificationException
      1. USSamir Mangroliya
    2. COso how come the exception only gets thrown when I change the visiblity?
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      1. USSchnodahipfe
    3. COare remove or add in `while(iterator.hasNext())`
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      1. POAndroid - setVisibility results in java.util.ConcurrentModificationException
      1. USSamir Mangroliya
 

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