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  1. PO
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    <p>I implemented a pinch zoom for my <code>TextView</code>, using <a href="http://www.zdnet.com/blog/burnette/how-to-use-multi-touch-in-android-2-part-6-implementing-the-pinch-zoom-gesture/1847" rel="noreferrer">this</a> tutorial. The resulting code is this:</p> <pre><code>private GestureDetector gestureDetector; private View.OnTouchListener gestureListener; </code></pre> <p>and in onCreate():</p> <pre><code> // Zoom handlers gestureDetector = new GestureDetector(new MyGestureDetector()); gestureListener = new View.OnTouchListener() { // We can be in one of these 2 states static final int NONE = 0; static final int ZOOM = 1; int mode = NONE; static final int MIN_FONT_SIZE = 10; static final int MAX_FONT_SIZE = 50; float oldDist = 1f; @Override public boolean onTouch(View v, MotionEvent event) { TextView textView = (TextView) findViewById(R.id.text); switch (event.getAction() &amp; MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_POINTER_DOWN: oldDist = spacing(event); Log.d(TAG, "oldDist=" + oldDist); if (oldDist &gt; 10f) { mode = ZOOM; Log.d(TAG, "mode=ZOOM" ); } break; case MotionEvent.ACTION_POINTER_UP: mode = NONE; break; case MotionEvent.ACTION_MOVE: if (mode == ZOOM) { float newDist = spacing(event); // If you want to tweak font scaling, this is the place to go. if (newDist &gt; 10f) { float scale = newDist / oldDist; if (scale &gt; 1) { scale = 1.1f; } else if (scale &lt; 1) { scale = 0.95f; } float currentSize = textView.getTextSize() * scale; if ((currentSize &lt; MAX_FONT_SIZE &amp;&amp; currentSize &gt; MIN_FONT_SIZE) ||(currentSize &gt;= MAX_FONT_SIZE &amp;&amp; scale &lt; 1) || (currentSize &lt;= MIN_FONT_SIZE &amp;&amp; scale &gt; 1)) { textView.setTextSize(TypedValue.COMPLEX_UNIT_PX, currentSize); } } } break; } return false; } </code></pre> <p>Magic constants 1.1 and 0.95 were chosen empirically (using <code>scale</code> variable for this purpose made my <code>TextView</code> behave kind of weird).</p>
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    1. POandroid pinch zoom
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    1. USNathaniel Ford
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    1. COCan i know your `MyGestureDetector()` class
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      1. USPraveenkumar
    2. COMyGestureDetector() please!
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      1. USrenanlf
    3. CO@Renanlf That was more than a year ago. Sorry, I don't even code for android anymore. Nor do I have those sources anywhere.
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