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PONPE when calling setVisibility with ViewFlipper
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  1. PONPE when calling setVisibility with ViewFlipper
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    copied!<p>I have a ViewFlipper with the following XML Note that this is all contained inside a RelativeLayout</p> <pre><code>&lt;ViewFlipper android:id="@+id/flipperIdentView" android:layout_width="match_parent" android:layout_height="match_parent" &gt; &lt;include layout="@layout/identification_face"/&gt; &lt;include layout="@layout/identification_rfid"/&gt; &lt;include layout="@layout/identification_voice"/&gt; &lt;include layout="@layout/identification_pill_dispense"/&gt; &lt;/ViewFlipper&gt; &lt;LinearLayout android:id="@+id/linear_button_view" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="bottom" android:orientation="vertical" &gt; &lt;include android:layout_width="wrap_content" android:layout_height="wrap_content" layout="@layout/test_buttons" android:gravity="center" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>The LinearLayout has the ID of "linear_button_view". Now inside my fragment, I have code to determine the flipping, and that all works. The problem is, that when I get to index 3 of the flipper, I want to hide this layout. All I should have to do is create a field with this ID, and then setVisibility to View.Gone. But I am throwing a NPE when I try to do this. </p> <p>Inside the class I have a:</p> <pre><code>private View buttonView; </code></pre> <p>Inside my onCreateView, I have the following code</p> <pre><code>View v = inflater.inflate(R.layout.pilltransferflipper, container, false); buttonView = v.findViewById(R.id.linear_button_view); </code></pre> <p>This is my method that controls flipper, and is responsible for hiding the view.</p> <pre><code>private void nextState() { flipperIndex++; if (flipperIndex &gt;= flipperPillTransfer.getChildCount()) { MainActivity activity = (MainActivity) getActivity(); activity.stateChange(State.SESSIONFINISHED); } else { flipperPillTransfer.showNext(); Log.d(TAG, "FLIPPER INDEX: " + flipperIndex); if(flipperIndex == 3) { buttonView.setVisibility(View.GONE); } } } </code></pre> <p>When I put a Log.d message inside the flipperIndex condition, It is returned fine, it seems that the issue is the buttonView.setVisibility part of things. Keep in mind, I am using fragments, so some methods that are available in the main activity may not be available to me. Thanks!</p> <h1> Here is the logCat</h1> <pre><code>09-26 10:05:54.381: D/PillTransferFragment(1719): FLIPPER INDEX: 3 09-26 10:05:54.381: D/AndroidRuntime(1719): Shutting down VM 09-26 10:05:54.381: W/dalvikvm(1719): threadid=1: thread exiting with uncaught exception (group=0x40c2b300) 09-26 10:05:54.381: E/AndroidRuntime(1719): FATAL EXCEPTION: main 09-26 10:05:54.381: E/AndroidRuntime(1719): java.lang.NullPointerException 09-26 10:05:54.381: E/AndroidRuntime(1719): at com.example.android.fragments.PillTransferFragment.nextState(PillTransferFragment.java:107) 09-26 10:05:54.381: E/AndroidRuntime(1719): at com.example.android.fragments.PillTransferFragment.onClick(PillTransferFragment.java:64) 09-26 10:05:54.381: E/AndroidRuntime(1719): at android.view.View.performClick(View.java:4084) </code></pre>
 

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