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    <p>I've written a class that extends TextView and does this. It just uses measureText as you suggest. Basically it has a maximum text size and minimum text size (which can be changed) and it just runs through the sizes between them in decrements of 1 until it finds the biggest one that will fit. Not particularly elegant, but I don't know of any other way.</p> <p>Here is the code:</p> <pre><code>import android.content.Context; import android.graphics.Paint; import android.util.AttributeSet; import android.widget.TextView; public class FontFitTextView extends TextView { public FontFitTextView(Context context) { super(context); initialise(); } public FontFitTextView(Context context, AttributeSet attrs) { super(context, attrs); initialise(); } private void initialise() { testPaint = new Paint(); testPaint.set(this.getPaint()); //max size defaults to the intially specified text size unless it is too small maxTextSize = this.getTextSize(); if (maxTextSize &lt; 11) { maxTextSize = 20; } minTextSize = 10; } /* Re size the font so the specified text fits in the text box * assuming the text box is the specified width. */ private void refitText(String text, int textWidth) { if (textWidth &gt; 0) { int availableWidth = textWidth - this.getPaddingLeft() - this.getPaddingRight(); float trySize = maxTextSize; testPaint.setTextSize(trySize); while ((trySize &gt; minTextSize) &amp;&amp; (testPaint.measureText(text) &gt; availableWidth)) { trySize -= 1; if (trySize &lt;= minTextSize) { trySize = minTextSize; break; } testPaint.setTextSize(trySize); } this.setTextSize(trySize); } } @Override protected void onTextChanged(final CharSequence text, final int start, final int before, final int after) { refitText(text.toString(), this.getWidth()); } @Override protected void onSizeChanged (int w, int h, int oldw, int oldh) { if (w != oldw) { refitText(this.getText().toString(), w); } } //Getters and Setters public float getMinTextSize() { return minTextSize; } public void setMinTextSize(int minTextSize) { this.minTextSize = minTextSize; } public float getMaxTextSize() { return maxTextSize; } public void setMaxTextSize(int minTextSize) { this.maxTextSize = minTextSize; } //Attributes private Paint testPaint; private float minTextSize; private float maxTextSize; } </code></pre>
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    1. POHow to adjust text font size to fit textview
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    1. COA binary search would generally be faster than a linear search.
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