title: How to zoom a textview in android?
body: <p>Can anyone guide me to perform zoom in&amp;out operations on multiple views in android ? I need to perform zoom in&amp;out operations on touch of image, text views . What should be my parent layout? Here is the code to zoom an image on touch of imageview. How  do i zoom a textview? Please help me. </p>
  
  <pre><code>   // 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;
  
  private void zoom(View v, MotionEvent event) 
  {
      ImageView view = (ImageView) v;
      view.setScaleType(ImageView.ScaleType.MATRIX);
      float scale;
  
      //  dumpEvent(event);
      // Handle touch events here...
  
      switch (event.getAction() &amp; MotionEvent.ACTION_MASK) 
      {
      case MotionEvent.ACTION_DOWN:  
          // first finger down only
          savedMatrix.set(matrix);
          start.set(event.getX(), event.getY());
  
          mode = DRAG;
          break;
  
      case MotionEvent.ACTION_UP: // first finger lifted
  
      case MotionEvent.ACTION_POINTER_UP: // second finger lifted
  
          mode = NONE;   
  
          break;
  
      case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down
  
          oldDist = spacing(event);
  
          if (oldDist &gt; 5f)
          {
              savedMatrix.set(matrix);
              midPoint(mid, event);
              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);
  
              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
  
  }
  
  /*
   * --------------------------------------------------------------------------
   * Method: spacing Parameters: MotionEvent Returns: float Description:
   * 
   * checks the spacing between the two fingers on touch
   * ----------------------------------------------------
   */
  
  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);
  }
  </code></pre>