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Android: TouchImageView
Created by: Mike Ortiz
Contributions by: 
 * Patrick Lackemacher
 * Babay88
 * @ipsilondev

Date: 2/17/2012
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Adds panning, pinch zoom, double tap zoom, and fling to Android ImageView.

Usage:
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Place TouchImageView.java in your project. It can then be used the same as
ImageView. Example:

TouchImageView img = (TouchImageView) findViewById(R.id.img);

If you are using TouchImageView in xml, then you must provide the full package
name, because it is a custom view. Example:

<com.example.touch.TouchImageView
	    android:id="@+id/img”
	    android:layout_width="match_parent"
	    android:layout_height="match_parent" />

API:
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// Get the current zoom. This is the zoom relative to the initial
// scale, not the original resource.
float getCurrentZoom();

// For a given point on the view (ie, a touch event), returns the
// point relative to the original drawable's coordinate system.
PointF getDrawablePointFromTouchPoint(float x, float y);

// For a given point on the view (ie, a touch event), returns the
// point relative to the original drawable's coordinate system.
PointF getDrawablePointFromTouchPoint(PointF p);

// Get the max zoom multiplier.
float getMaxZoom();

// Get the min zoom multiplier.
float getMinZoom();

// After setting image, a value of true means the new image should maintain
// the zoom of the previous image. False means the image should be resized 
// within the view. Default value is true.
void maintainZoomAfterSetImage(boolean maintainZoom); 

// Set the max zoom multiplier. Default value: 3.
void setMaxZoom(float max);

// Set the min zoom multiplier. Default value: 1.
void setMinZoom(float min);