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POAndroid: Null Pointer Exception During PagerView Instanciation
 

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  1. POAndroid: Null Pointer Exception During PagerView Instanciation
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    <p>I'm getting a null pointer exception during runtime. I'm pulling in RelativeLayouts from 2 XML files for the PagerView, which I seem to have messed up. Any idea what's causing the error?</p> <p>Thanks for any help!</p> <p>I have two of these XML files that have this same structure-- player_turn_solution_component.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/player_turn_solution_component" android:layout_width="wrap_content" android:layout_height="wrap_content" &gt; &lt;TextView android:id="@+id/solutionCaption" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:text="what do you see?" /&gt; &lt;EditText android:id="@+id/solutionInput" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/solutionCaption" android:layout_centerHorizontal="true" android:layout_marginTop="20dp" android:ems="10" &gt; &lt;requestFocus /&gt; &lt;/EditText&gt; &lt;/RelativeLayout&gt; </code></pre> <p>My instanciation function:</p> <pre><code>@Override public Object instantiateItem(View collection, int position) { //Our specific component (TextView or ImageView, depending on posision //is placed inside a RelativeLayout that acts as a container RelativeLayout container = new RelativeLayout(pagerContext); TextView caption = new TextView(pagerContext); caption.setText("View: " + position); caption.setTypeface(typeface); caption.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20); container.addView(caption); RelativeLayout optionLayout = null; TextView optionCaption = null; if (position == 0) { optionLayout = (RelativeLayout) findViewById(R.id.player_turn_solution_component); optionCaption = (TextView) findViewById(R.id.solutionCaption); } else if (position == 1) { optionLayout = (RelativeLayout) findViewById(R.id.player_turn_clue_component); optionCaption = (TextView) findViewById(R.id.clueCaption); } container.addView(optionLayout); ((ViewPager) collection).addView(container,0); //get the container ready return container; } </code></pre> <p>And the LogCat output:</p> <pre><code>07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.ViewGroup.addView(ViewGroup.java:3158) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.ViewGroup.addView(ViewGroup.java:3145) 07-06 09:30:22.337: E/AndroidRuntime(8418): at my.app.PlayerTurnActivity$HelpPagerAdapter.instantiateItem(PlayerTurnActivity.java:136) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.support.v4.view.PagerAdapter.instantiateItem(PagerAdapter.java:110) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:649) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.support.v4.view.ViewPager.populate(ViewPager.java:783) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1016) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.View.measure(View.java:12892) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:594) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:376) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.View.measure(View.java:12892) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.View.measure(View.java:12892) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1375) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.View.measure(View.java:12892) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 07-06 09:30:22.337: E/AndroidRuntime(8418): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2257) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.View.measure(View.java:12892) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1240) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2628) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.os.Handler.dispatchMessage(Handler.java:99) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.os.Looper.loop(Looper.java:137) 07-06 09:30:22.337: E/AndroidRuntime(8418): at android.app.ActivityThread.main(ActivityThread.java:4512) 07-06 09:30:22.337: E/AndroidRuntime(8418): at java.lang.reflect.Method.invokeNative(Native Method) 07-06 09:30:22.337: E/AndroidRuntime(8418): at java.lang.reflect.Method.invoke(Method.java:511) 07-06 09:30:22.337: E/AndroidRuntime(8418): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794) 07-06 09:30:22.337: E/AndroidRuntime(8418): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:561) 07-06 09:30:22.337: E/AndroidRuntime(8418): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>EDIT: My new Activity contains the following, but crashes with the same NPE, but only when I swipe to change the pager view.</p> <pre><code>if (position == 0) { View v = getLayoutInflater().inflate(R.layout.player_turn_solution_component, null); optionLayout = (RelativeLayout) v.findViewById(R.id.player_turn_solution_component); } else if (position == 1) { View v = getLayoutInflater().inflate(R.layout.player_turn_clue_component, null); optionLayout = (RelativeLayout) v.findViewById(R.id.player_turn_clue_component); } container.addView(optionLayout); ((ViewPager) collection).addView(container,0); //get the container ready return container; </code></pre>
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    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USK. Barresi
    1. USK. Barresi
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. COoptionLayout is null. Where you have inflate it?
      singulars
      1. POAndroid: Null Pointer Exception During PagerView Instanciation
      1. USMohsin Naeem
    2. COwhat is code at line No:36 in your PlayerTurnActivity.java file?
      singulars
      1. POAndroid: Null Pointer Exception During PagerView Instanciation
      1. USChintan Raghwani
    3. COLine 36 is empty. Also, I didn't inflate it anywhere. That must be it!
      singulars
      1. POAndroid: Null Pointer Exception During PagerView Instanciation
      1. USK. Barresi
 

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