android中的缩略图工具类

public class ImgUtil {

/**
* 获取图片缩略图
*/
public static Bitmap getImageThumbnailTwo(String imagePath, int width, int height) {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
// 获取这个图片的宽和高，注意此处的bitmap为null
Bitmap bitmap = BitmapFactory.decodeFile(imagePath, options);
// 计算缩放比
int h = options.outHeight;
int w = options.outWidth;
int beWidth = w / width;
int beHeight = h / height;
int be = 1;
if (beWidth < beHeight) {
be = beWidth;
} else {
be = beHeight;
}
if (be <= 0) {
be = 1;
}
options.inSampleSize = be;
options.inJustDecodeBounds = false; // 设为 false
// 重新读入图片，读取缩放后的bitmap，注意这次要把options.inJustDecodeBounds 设为 false
bitmap = BitmapFactory.decodeFile(imagePath, options);
// 利用ThumbnailUtils来创建缩略图，这里要指定要缩放哪个Bitmap对象
bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height,
ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
return bitmap;
}

/**
* 获取视频缩略图
*/
public static Bitmap getVideoThumbnail(String videoPath, int width, int height,
int kind) {
Bitmap bitmap;
// 获取视频的缩略图
bitmap = ThumbnailUtils.createVideoThumbnail(videoPath, kind);
bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height,
ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
return bitmap;
}

}

使用方法：

图片：ImgUtil.getImageThumbnailTwo(file.getAbsolutePath(), 110, 110)；

视频：ImgUtil.getVideoThumbnail(file.getAbsolutePath(), 110, 110, MediaStore.Images.Thumbnails.MICRO_KIND)