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POHorizontalScrollView: auto-scroll to end when new Views are added?
 

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  1. POHorizontalScrollView: auto-scroll to end when new Views are added?
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    <p>I have a HorizontalScrollView containing a LinearLayout. On screen I have a Button that will add new Views to the LinearLayout at runtime, and I'd like the scroll view to scroll to the end of the list when a new View is added.</p> <p>I almost have it working - except that it always scrolls one view short of the last view. It seems like it's scrolling without first calculating the inclusion of the new view.</p> <p>In my app I am using a custom View object, but I made a small test application that uses ImageView and has the same symptom. I tried various things like requestLayout() on both the Layout and ScrollView, I tried scrollTo(Integer.MAX_VALUE) and it scrolled into the netherverse :) Am I violating a UI thread issue or something?</p> <ul> <li>Rick</li> </ul> <p>======</p> <pre><code> public class Main extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button b = (Button) findViewById(R.id.addButton); b.setOnClickListener(new AddListener()); add(); } private void add() { LinearLayout l = (LinearLayout) findViewById(R.id.list); HorizontalScrollView s = (HorizontalScrollView) findViewById(R.id.scroller); ImageView i = new ImageView(getApplicationContext()); i.setImageResource(android.R.drawable.btn_star_big_on); l.addView(i); s.fullScroll(HorizontalScrollView.FOCUS_RIGHT); } private class AddListener implements View.OnClickListener { @Override public void onClick(View v) { add(); } } } </code></pre> <p>Layout XML:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;HorizontalScrollView android:id="@+id/scroller" android:layout_width="wrap_content" android:layout_height="wrap_content" android:scrollbarSize="50px"&gt; &lt;LinearLayout android:id="@+id/list" android:layout_width="wrap_content" android:layout_height="wrap_content" android:padding="4px"/&gt; &lt;/HorizontalScrollView&gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_gravity="center"&gt; &lt;Button android:id="@+id/addButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:paddingLeft="80px" android:paddingRight="80px" android:paddingTop="40px" android:paddingBottom="40px" android:text="Add"/&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre>
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