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POWhy setVisibility causes NullPointerException?
 

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  1. POWhy setVisibility causes NullPointerException?
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    <p>I have the following:</p> <pre><code>private OnItemSelectedListener CommentCodeListener = new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView&lt;?&gt; parent, View view, int position, long id) { Log.i(LogTAG, "spinner selection: "+ position); LayoutInflater inflater=(LayoutInflater)getSystemService(LAYOUT_INFLATER_SERVICE); View view2=inflater.inflate(R.layout.commentdialog, null); CheckBox CommentPaper = (CheckBox) view.findViewById(R.id.CommentPaper); EditText CommentField = (EditText) view.findViewById(R.id.CommentOtherField); String[] arr = getResources().getStringArray(R.array.CommentCodeListValues); String CommentCode = arr[position]; int CommentCodeInt = Integer.parseInt(arr[position]); Log.i(LogTAG, "spinner selection (int): "+ CommentCodeInt); CommentPaper.setVisibility(View.GONE); CommentField.setVisibility(View.GONE); if( (CommentCodeInt &gt;= 21 &amp;&amp; CommentCodeInt &lt;= 31) || CommentCodeInt == 41 ) { Log.i(LogTAG, "set CommentPaper visible"); CommentPaper.setVisibility(View.VISIBLE); } if( (CommentCodeInt &gt;=22 &amp;&amp; CommentCodeInt &lt;=33) || (CommentCodeInt &gt;= 35 &amp;&amp; CommentCodeInt &lt;=36 ) || (CommentCodeInt &gt;= 42 &amp;&amp; CommentCodeInt &lt;=43 ) ) { Log.i(LogTAG, "set CommentPaper visible"); } if( CommentCodeInt &gt;=41 &amp;&amp; CommentCodeInt &lt;=43 ) { Log.i(LogTAG, "set CommentField visible"); CommentField.setVisibility(View.VISIBLE); } } @Override public void onNothingSelected(AdapterView&lt;?&gt; arg0) { Log.i(LogTAG, "nothing selected"); } }; </code></pre> <p>The layout: </p> <pre><code> &lt;LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:orientation="vertical" &gt; &lt;Spinner android:id="@+id/CommentCode_spinner" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;EditText android:id="@+id/MultiLineComment" android:layout_width="fill_parent" android:layout_height="wrap_content" android:ems="10" android:hint="@string/commentLabel" android:inputType="textMultiLine" android:lines="3" android:scrollbars="vertical" &gt; &lt;/EditText&gt; &lt;EditText android:id="@+id/CommentOtherField" android:layout_width="fill_parent" android:layout_height="wrap_content" android:ems="10" android:hint="@string/commentLabel" android:visibility="visible" &gt; &lt;/EditText&gt; &lt;CheckBox android:id="@+id/CommentPaper" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/reportCheckBox" android:visibility="visible" /&gt; &lt;Button android:id="@+id/AddCommentButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/okButton" /&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p>Please note, that the layout above (commentdialog.xml) is a Dialog.</p> <p>The CommentCodeListener is called when I select something with a spinner. Everything works when setVisibility is commented. I have tried with </p> <ul> <li><code>CheckBox CommentPaper = (CheckBox) findViewById(R.id.CommentPaper);</code></li> <li><code>CheckBox CommentPaper = (CheckBox) view.findViewById(R.id.CommentPaper);</code></li> <li><code>CheckBox CommentPaper = (CheckBox) view2.findViewById(R.id.CommentPaper);</code></li> </ul> <p>but no luck.</p> <p>What am I missing?</p>
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    1. COWhat is the layout for the items that are being selected? Also, why don't you follow [Java naming conventions](http://www.oracle.com/technetwork/java/javase/documentation/codeconventions-135099.html#367), which dictate camelCase variable names?
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    2. COWhat is the meaning of inflating view2?
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    3. COLayout is inserted to the question.view2 inflating the commentdialog.xml, which contains the spinner.
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