Android image pinch (continual in/out) / double tap zoom, scroll larger images, configurable , should work on 1.5(without pinch zoom) because of dynamic class loading
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.
.settings fixing issue #1 and big refactoring Mar 8, 2012
examples Options + readme changes. Fix problem with pinch zoom. Fix library ex… Oct 21, 2013
.gitignore Issue #1 Separate Library and Example Jun 25, 2012
LICENSE first github commit Jan 28, 2012 Readme fix Oct 21, 2013


Library provides you with options for manipulating images: zoom (double tap and/or pinch zoom), scroll, determine position of touch, etc... Example project included!

public methods:

  • java setImage(Bitmap) - Bitmap which you want to show in view(layout)
  • java setImage(Bitmap bitmap, int widthOfParent) - you can set maximum width(in pixels) of parent if you want. But in most cases above will be enough.

You can extend class and override method

java protected void onImageClick(float posX, float posY) to add custom ontouchhandler (for example try touch Homer's head on second picture in example project)


  • minWidth default: 0 if minWidth == 0 than minWidth = min(parent view width, bitmap width)
  • maxWidth default: 0 if > 0 than this width will be for max zoom
  • maxWidthMultiplier default: 0 if maxWidth == 0 && maxWidthMultiplier > 0 than maxWidth = minWidth * maxWidthMultiplier
  • pinchToZoomMinDistance default: 5
  • isDoubleTapZoomEnabled default: true should double tap perform zoom in steps
  • maxZoomSteps default: 3 how much zoom steps
  • timeForClick default: 300 in miliseconds. if finger down/up interval <= timeForClick than click occured
  • timeForDoubleClick default: 300 in miliseconds. if two click occured in interval <= timeForDoubleClick we have double click
  • distanceZoomMultiplier default: 4.0f for pinch zoom - zooming in pixels = move distance * distanceZoomMultiplier
  • backgroundQualityUpdateMilis default: 2000 - this is paired with setting bellow to allow "smarter" / "optimize" pinch zooming but its not fully tested
  • afterPinchZoomSetLowerQualityAndUpdateQualityLater - default: false - better leave it as it is. If true may render faster or render image slower, but this is not fully tested
  • angleTolerant default: 30 degree tolerance for pinch zoom - leave as it is in most cases - currently not used, because made a lot of problems in past