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POWhy a layout is clipped when use scrollBy or scrollTo?
 

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  1. POWhy a layout is clipped when use scrollBy or scrollTo?
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    <p>I'm trying to use the function <a href="http://developer.android.com/reference/android/view/View.html#scrollBy%28int,%20int%29" rel="nofollow noreferrer"><code>View::scrollBy(int, int)</code></a> to scroll a <code>LinearLayout</code> in a custom view. The problem is that when the height of the views added in the <code>LinearLayout</code> are <code>WRAP_CONTENT</code> the content is clipped when scrolled. However when the views has a fixed height (for example 20px) this problem doesn't happen. I want to use <code>WRAP_CONTENT</code> instade of a fixed height. How can I do this?</p> <p>I write this simple code to reproduce the problem. You can see the problem in this image:</p> <p><img src="https://i.stack.imgur.com/yZJYt.png" alt="Clipped LinearLayout"></p> <p>The code:</p> <pre class="lang-java prettyprint-override"><code>public class Scroll extends LinearLayout { private final Context context; private int currentY; public Scroll(Context context, AttributeSet attrs) { super(context, attrs); this.context = context; LayoutInflater.from(context).inflate(R.layout.scroll, this, true); LayoutParams params1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); LayoutParams params2 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 19); fillRow((LinearLayout) findViewById(R.id.ll1), params1); fillRow((LinearLayout) findViewById(R.id.ll2), params2); } private void fillRow(LinearLayout linearLayout, LinearLayout.LayoutParams layoutParams) { for (int i = 0; i &lt; 100; i++) { TextView textView = new TextView(context); textView.setBackgroundResource(android.R.color.white); textView.setLayoutParams(layoutParams); textView.setText(i + ""); linearLayout.addView(textView); } } @Override public boolean onTouchEvent(MotionEvent event) { // Idea: https://stackoverflow.com/a/4991692/842697 switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { currentY = (int) event.getRawY(); break; } case MotionEvent.ACTION_MOVE: { int y2 = (int) event.getRawY(); int scrollY = currentY - y2; currentY = y2; findViewById(R.id.ll1).scrollBy(0, scrollY); findViewById(R.id.ll2).scrollBy(0, scrollY); break; } case MotionEvent.ACTION_UP: { break; } } return true; } } </code></pre> <p>Where <code>R.layout.scroll</code> is this XML:</p> <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" &gt; &lt;LinearLayout android:id="@+id/ll1" android:layout_width="0dip" android:layout_height="match_parent" android:layout_weight="1" android:background="#FF0000" android:orientation="vertical" /&gt; &lt;LinearLayout android:id="@+id/ll2" android:layout_width="0dip" android:layout_height="match_parent" android:layout_weight="1" android:background="#00FF00" android:orientation="vertical" /&gt; &lt;/LinearLayout&gt; </code></pre> <p><a href="https://stackoverflow.com/users/1211663/anne-droid">@Anne Droid</a> comments a workaround in this <a href="https://stackoverflow.com/q/12050935/842697">related question</a>. But I do not like the collateral problems of it.</p>
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