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    <p>Are you checking if button <code>b</code> is null? As the logcat states <code>java.lang.NullPointerException</code>, strange that you're experiencing the issue, what I have usually is this:</p> <pre><code>_btnFoo = (Button)findViewById(R.id.btnFoo); if (_btnFoo != null){ _btnFoo.setOnClickListener(new OnClickListener(){ @Override public void onClick(View v){ .... } }); } </code></pre> <p>Its the null pointer exception that sticks out like a sore thumb so something is not initialized there around that.</p> <p><strong>Edit:</strong> Since my answer was not sufficient enough, I thought of digging around the sources, taken from the ICS 4.0.3 repo, this is a section of the code found here, at lines 14103 in <code>frameworks/base/core/java/android/view/View.java</code></p> <pre><code>private final class PerformClick implements Runnable { public void run() { performClick(); } } </code></pre> <p>The meat of the method is in this found at lines 3505 in the same source:</p> <pre><code>public boolean performClick() { sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); ListenerInfo li = mListenerInfo; if (li != null &amp;&amp; li.mOnClickListener != null) { playSoundEffect(SoundEffectConstants.CLICK); li.mOnClickListener.onClick(this); return true; } return false; } </code></pre> <p><s>My guess is that the <code>Runnable</code> within the <code>PerformClick</code> is glitchy since it appears to be cross-threading without any hint of <code>runOnUiThread</code> or similar safeguard.</p> <p>I'll stress that in the previous sentence - I'll put an open-ended question-mark and use it loosely in the sense of the word as in, not to be taken literally.</s></p> <p>Jen's comment is proven to be correct as shown here, taken from lines 3010:</p> <pre><code>case R.styleable.View_onClick: if (context.isRestricted()) { throw new IllegalStateException("The android:onClick attribute cannot " + "be used within a restricted context"); } final String handlerName = a.getString(attr); if (handlerName != null) { setOnClickListener(new OnClickListener() { private Method mHandler; public void onClick(View v) { if (mHandler == null) { try { mHandler = getContext().getClass().getMethod(handlerName, View.class); } catch (NoSuchMethodException e) { int id = getId(); String idText = id == NO_ID ? "" : " with id '" + getContext().getResources().getResourceEntryName( id) + "'"; throw new IllegalStateException("Could not find a method " + handlerName + "(View) in the activity " + getContext().getClass() + " for onClick handler" + " on view " + View.this.getClass() + idText, e); } } try { mHandler.invoke(getContext(), View.this); } catch (IllegalAccessException e) { throw new IllegalStateException("Could not execute non " + "public method of the activity", e); } catch (InvocationTargetException e) { throw new IllegalStateException("Could not execute " + "method of the activity", e); } } }); } break; </code></pre> <p>At line 3452, the <code>setOnClickListener</code> method is where the call-back gets registered as shown:</p> <pre><code>public void setOnClickListener(OnClickListener l) { if (!isClickable()) { setClickable(true); } getListenerInfo().mOnClickListener = l; } </code></pre> <p>The answer to the OP's question is there's a bug in the framework as Jens succinctly put it <em>It's a discrepancy in error handling at least. Typically one shouldn't be throwing exceptions in <code>onClick</code> - but I can imagine that this would make it a bit harder to track down errors "in the wild" if no force closes are reported back on apps that do a lot of work in their click handlers.</em></p>
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    1. POAndroid ICS : Failed to handle callback; interface not implemented, callback:android.view.View$PerformClick@40d80cc8
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    1. COUpdated stacktrace , I tried Run time exception as well as throwing NPE also
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    2. COHo okie... guess my answer is not quite a help to you :) Another thing, why View.OnClickListener? See the parameter I used there...
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    3. COThanks biggest surprise is if you try b.perfomClick it crashes app but not in other case.
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