android2.2缩略图类ThumbnailUtils

核心提示：提供了四个对外的静态接口1.Bitmap android.media.ThumbnailUtils.createImageThumbnail(String filePath, int kind)This method first examines if the thumbnail embedded in EXIF is

提供了四个对外的静态接口

1.

Bitmap android.media.ThumbnailUtils.createImageThumbnail(String filePath, int kind)

This method first examines if the thumbnail embedded in EXIF is bigger than our target size. If not, then it'll create a thumbnail from original image. Due to efficiency consideration, we want to let MediaThumbRequest avoid calling this method twice for both kinds, so it only requests for MICRO_KIND and set saveImage to true. This method always returns a "square thumbnail" for MICRO_KIND thumbnail.

Parameters:

filePath the path of image file

kind could be MINI_KIND or MICRO_KIND

Returns:

Bitmap

@hide

This method is only used by media framework and media provider internally.

2.

Bitmap android.media.ThumbnailUtils.createVideoThumbnail(String filePath, int kind)

返回视频缩略图，如果视频损坏或格式不被支持那么都将返回为空

filePath：视频文件的位置

kind：Images.Thumbnails.MICRO_KIND或者Images.Thumbnails.MINI_KIND最终和分辨率有关

3.

Bitmap android.media.ThumbnailUtils.extractThumbnail(Bitmap source, int width, int height)

创建一个指定大小居中的缩略图

4.

Bitmap android.media.ThumbnailUtils.extractThumbnail(Bitmap source, int width, int height, int options)

创建一个指定大小居中的缩略图，如果options定义为OPTIONS_RECYCLE_INPUT，则回收资源

ThumbnailUtils类是API Level从8或更高才开始支持的，不向下兼容