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POAndroid - v4 PagerTabStrip causes IllegalStateException - Must measure with an exact width
 

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  1. POAndroid - v4 PagerTabStrip causes IllegalStateException - Must measure with an exact width
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    <p>&lt; Edit ></p> <ol> <li><p>A new observation - I've tried the same ViewPager as stand alone Activity and as an AppWidget configuration view - and it crashes often as configuration view, while consistently runs well as a simple activity.</p></li> <li><p>Another observation - If the configuration layout is ViewPager as root, no crashes happened. if the ViewPager is embedded in FlowLayout or RelativeLayout - it crashes often.</p></li> </ol> <p>&lt; / Edit ></p> <p>I'm using v4 ViewPager with PagerTabStrip in my AppWidget configuration xml, and it works perfectly most of the time.</p> <p>However, I get this error (app crash) when some processing involved while loading the view:</p> <pre><code> java.lang.IllegalStateException: Must measure with an exact width at android.support.v4.view.PagerTitleStrip.onMeasure(PagerTitleStrip.java:428) at android.view.View.measure(View.java:8335) at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1350) at android.view.View.measure(View.java:8335) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138) at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) ...etc... </code></pre> <p>A code snippet from android.support.v4.view.PagerTitleStrip.onMeasure() -</p> <pre><code>@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { final int widthMode = MeasureSpec.getMode(widthMeasureSpec); //... if (widthMode != MeasureSpec.EXACTLY) { throw new IllegalStateException("Must measure with an exact width"); } //... } </code></pre> <p>How could I control the widthMode??</p> <p>All the stack above is happening outside my code.</p> <p>In my code I've tried to rule out many factors, and eventually I may have managed to isolate a root cause:</p> <p>When I'm adding a mock "work" of 5 milis sleep per fragment (X30 fragments), I get the above error, and when removing it - the error seem gone. Tried moving the work to onCreate() - didn't make a difference</p> <pre><code>public static class TestFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.splash, container, false); try { Thread.sleep(5); // &lt;&lt; mock work causes quite consistent error } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } Log.i(TAG, "..onCreateView"); return v; } } </code></pre> <p>The actual work I'm doing on my real adapter's fragment is minimal and can't be avoided (setting the initial values which later populate the data in a background thread). So I don't know how much more I can defer to a background thread.</p> <p>Does anyone have experience with this? Any idea why the above error occurs, and if it is possible to avoid it?</p> <p>For reference (Not sure if it's relevant):</p> <pre><code>&lt;LinearLayout ...&gt; &lt;android.support.v4.view.ViewPager android:layout_marginLeft="16dp" android:layout_marginRight="16dp" android:id="@+id/aw_pager" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1.0" android:background="@drawable/dialog_full_holo_dark" android:fadingEdge="horizontal" android:fadingEdgeLength="40dp" &gt; &lt;android.support.v4.view.PagerTabStrip android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_gravity="top" /&gt; &lt;/android.support.v4.view.ViewPager&gt; &lt;/LinearLayout&gt; </code></pre>
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