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POjava.util.ConcurrentModificationException in View.setVisibility
 

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  1. POjava.util.ConcurrentModificationException in View.setVisibility
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    <p>I'm implementing drag'n'drop for views. When drag is started, I set visibility of the view to <code>INVISIBLE</code>, then, if the drag was interrupted - back to <code>VISIBLE</code>:</p> <pre><code>public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { // Skipped some code boolean dragStarted = v.startDrag(data, shadowBuilder, v, 0); if (dragStarted) { v.setVisibility(View.INVISIBLE) } } } </code></pre> <p>And:</p> <pre><code>if (event.getAction() == DragEvent.ACTION_DRAG_ENDED) { View droppedView = (View) event.getLocalState(); droppedView.setVisibility(View.VISIBLE); } </code></pre> <p>And when "Drag ended" event is called, I'm getting exception:</p> <pre><code>E/AndroidRuntime(7118): FATAL EXCEPTION: main E/AndroidRuntime(7118): java.util.ConcurrentModificationException E/AndroidRuntime(7118): at java.util.HashMap$HashIterator.nextEntry(HashMap.java:792) E/AndroidRuntime(7118): at java.util.HashMap$KeyIterator.next(HashMap.java:819) E/AndroidRuntime(7118): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1046) E/AndroidRuntime(7118): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1048) E/AndroidRuntime(7118): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1048) E/AndroidRuntime(7118): at android.view.ViewGroup.dispatchDragEvent(ViewGroup.java:1048) E/AndroidRuntime(7118): at android.view.ViewRootImpl.handleDragEvent(ViewRootImpl.java:3471) E/AndroidRuntime(7118): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2620) E/AndroidRuntime(7118): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime(7118): at android.os.Looper.loop(Looper.java:137) E/AndroidRuntime(7118): at android.app.ActivityThread.main(ActivityThread.java:4575) E/AndroidRuntime(7118): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime(7118): at java.lang.reflect.Method.invoke(Method.java:511) E/AndroidRuntime(7118): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789) E/AndroidRuntime(7118): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556) E/AndroidRuntime(7118): at dalvik.system.NativeStart.main(NativeMethod) </code></pre> <p>Why and how to fix it?</p>
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    1. USKeyhan Asghari
    1. USarts777
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    1. COabout why, this exception occurs when you're inserting or deleting some element of an iterable, when you're iterating on that. but it seems to bee a bug in android.
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      1. USKeyhan Asghari
    2. COtry `droppedView.post(new Runnable() {public void run() {droppedView.setVisibility(View.VISIBLE);}});` you will need to make droppedView final
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      1. USSherif elKhatib
    3. COjust an idea , but have you tried the API demos ? they have a nice drag&drop example there. just play with it and change the visibility exactly when you wish to. since i don't have a device with API11+ , i cannot check if whatever i do helps (the emulator is not enough as it sometimes gives false results)
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