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    <p>The above is ok but you to it as below ::</p> <p>In oncreate() you must instialize your textview and set ontouch event on it as below</p> <pre><code>TextView tv = (TextView)findViewById(R.id.name); tv.setText("text"); tv.setOnTouchListener(this); </code></pre> <p>here is the complete code including your code:::</p> <pre><code>public class MyTextView extends Activity implements OnTouchListener{ private static final String TAG = "Touch"; @SuppressWarnings("unused") private static final float MIN_ZOOM = 1f,MAX_ZOOM = 1f; // These matrices will be used to scale points of the image Matrix matrix = new Matrix(); Matrix savedMatrix = new Matrix(); // The 3 states (events) which the user is trying to perform static final int NONE = 0; static final int DRAG = 1; static final int ZOOM = 2; int mode = NONE; // these PointF objects are used to record the point(s) the user is touching PointF start = new PointF(); PointF mid = new PointF(); float oldDist = 1f; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); TextView iv = new TextView(this); iv.setText("text"); iv.setOnTouchListener(this); setContentView(iv); } @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub ImageView view = (ImageView) v; view.setScaleType(ImageView.ScaleType.MATRIX); float scale; dumpEvent(event); // Handle touch events here... switch (event.getAction() &amp; 255) { case MotionEvent.ACTION_DOWN: // first finger down only savedMatrix.set(matrix); start.set(event.getX(), event.getY()); Log.d(TAG, "mode=DRAG"); // write to LogCat mode = DRAG; break; case MotionEvent.ACTION_UP: // first finger lifted case 6: // second finger lifted mode = NONE; Log.d(TAG, "mode=NONE"); break; case 5: // first and second finger down oldDist = spacing(event); Log.d(TAG, "oldDist=" + oldDist); if (oldDist &gt; 5f) { savedMatrix.set(matrix); midPoint(mid, event); mode = ZOOM; Log.d(TAG, "mode=ZOOM"); } break; case MotionEvent.ACTION_MOVE: if (mode == DRAG) { matrix.set(savedMatrix); matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); // create the transformation in the matrix of points } else if (mode == ZOOM) { // pinch zooming float newDist = spacing(event); Log.d(TAG, "newDist=" + newDist); if (newDist &gt; 5f) { matrix.set(savedMatrix); scale = newDist / oldDist; // setting the scaling of the // matrix...if scale &gt; 1 means // zoom in...if scale &lt; 1 means // zoom out matrix.postScale(scale, scale, mid.x, mid.y); } } break; } view.setImageMatrix(matrix); // display the transformation on screen return true; // indicate event was handled } private float spacing(MotionEvent event) { float x = event.getX(0) - event.getX(1); float y = event.getY(0) - event.getY(1); return FloatMath.sqrt(x * x + y * y); } /* * -------------------------------------------------------------------------- * Method: midPoint Parameters: PointF object, MotionEvent Returns: void * Description: calculates the midpoint between the two fingers * ------------------------------------------------------------ */ private void midPoint(PointF point, MotionEvent event) { float x = event.getX(0) + event.getX(1); float y = event.getY(0) + event.getY(1); point.set(x / 2, y / 2); } /** Show an event in the LogCat view, for debugging */ private void dumpEvent(MotionEvent event) { String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE","POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" }; StringBuilder sb = new StringBuilder(); int action = event.getAction(); int actionCode = action &amp; MotionEvent.ACTION_MASK; sb.append("event ACTION_").append(names[actionCode]); if (actionCode == MotionEvent.ACTION_POINTER_DOWN || actionCode == MotionEvent.ACTION_POINTER_UP) { sb.append("(pid ").append(action &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT); sb.append(")"); } sb.append("["); for (int i = 0; i &lt; event.getPointerCount(); i++) { sb.append("#").append(i); sb.append("(pid ").append(event.getPointerId(i)); sb.append(")=").append((int) event.getX(i)); sb.append(",").append((int) event.getY(i)); if (i + 1 &lt; event.getPointerCount()) sb.append(";"); } sb.append("]"); Log.d("Touch Events ---------", sb.toString()); } } </code></pre>
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    1. POHow to zoom a textview in android?
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    1. USShankar Agarwal
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    1. COThanks Agarwal. But it is crashing immediately on touch of TextView. ERROR : java.lang.ClassCastException: android.widget.TextView @ line 1 of onTouch() method. And Could you please tell me what should be my parent Layout to have and perform zoom on both image,text views ?
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