Subsampling Zoom Image View - 支持大图的自定义ImageView

如果你想加载超大图片（1m以上），同时又想让图片可以随意的缩放，还想要流畅的效果，还不想发生oom，那么这个项目绝对是不二的选择。其流畅度与可操作性绝对不输原生相册应用。demo中的图片最大是2.7m，但是一点也不卡。

特性

图片展示

• Display images from assets, resources or the file system
• Automatically rotate images from the file system (e.g. the camera or gallery) according to EXIF
• Manually rotate images in 90° increments
• Swap images at runtime
• Use a custom bitmap decoder

SubsamplingScaleImageViewonly:

• Display huge images, larger than can be loaded into memory
• Show high resolution detail on zooming in
• Tested up to 20,000x13,000px, though larger images are slower

These views don't extendImageViewand aren't intended as a general purpose replacement for it. They're specialised for the display of photos and other large images, not the display of 9-patches, shapes and the other types of drawable that ImageView supports.

手势检测

• One finger pan
• Two finger pinch to zoom
• Quick scale (one finger zoom)
• Pan while zooming
• Seamless switch between pan and zoom
• Fling momentum after panning
• Double tap to zoom in and out
• Options to disable pan and/or zoom gestures

动画

• Public methods for animating the scale and center
• Customisable duration and easing
• Optional uninterruptible animations

重写事件检测

• SupportsOnClickListenerandOnLongClickListener
• Supports interception of events usingGestureDetectorandOnTouchListener
• Extend to add your own gestures

易于集成

• Use within aViewPagerto create a photo gallery
• Easily restore scale, center and orientation after screen rotation
• Can be extended to add overlay graphics that move and scale with the image
• Handles view resizing andwrap_contentlayout

局限

• SubsamplingScaleImageViewrequires SDK 10 (Gingerbread).
• SubsamplingScaleImageViewcannot display aBitmapobject - the image file needs to be in assets, resources or external storage.
• SubsamplingScaleImageViewcannot display grayscale PNGs on Android Lollipop, due to bugs in the skia library and/or BitmapRegionDecoder. Earlier versions of Android also have issues displaying some grayscale PNGs, but not all. I have reported these bugs to Google. For a workaround, see the section on custom bitmap decoders below.
• These views do not extend ImageView so attributes including android:tint, android:scaleType and android:src are not supported.
• Images stored in resources and assets cannot be rotated based on EXIF, you'll need to do it manually. You probably know the orientation of your own files :-)

项目主页：http://www.open-open.com/lib/view/home/1425530369712