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copied!<p>I ended up figuring it out through some significant Googling. On <a href="http://translate.google.com/translate?hl=en&sl=zh-CN&tl=en&u=http://cafebabe.sinaapp.com/?cat=16">this page</a> I found out that <strong>onMeasure is actually called twice</strong> when <code>android:layout_weight</code> is set. I found out later that it's mentioned in <a href="http://developer.android.com/guide/topics/ui/how-android-draws.html">How Android Draws Views</a> that <code>measure()</code> can be called any number of times, it just didn't immediately sit in my brain. The first pass obviously can't give a value for the size of each child, since it doesn't know what the weights of all of the View's siblings are. It goes through it once and gives a width of 0 with a MeasureSpec.UNSPECIFIED to see if the child has any specific constraints, then goes through <em>again</em> to assign the actual weights with a MeasureSpec.EXACTLY. My Activity was getting screwed up at the first pass, so it never got to the layout step. Amending my onMeasure() to the following code fixed the problem.</p> <pre><code>@Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthMode = MeasureSpec.getMode(widthMeasureSpec); if (widthMode != MeasureSpec.UNSPECIFIED) { int widthSize = MeasureSpec.getSize(widthMeasureSpec); int lineWidth = widthSize - getPaddingLeft() - getPaddingRight(); // Change the text size until the largest line of text fits. while (lineWidth < calculateTextWidth()) { for (TextView textView : this.childViews) { float newSize = textView.getTextSize() - 1; textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, newSize); } } } super.onMeasure(widthMeasureSpec, heightMeasureSpec); } </code></pre>

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