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取缩略图不等同于缩放图片.
缩放图片是保持不失真的情况下缩放处理,并进行平滑处理.
缩略图则不然,允许失真,目的只是取出图片的轮廓.
保存Bitmap图片
private void saveBitmap(Bitmap bm,String picName) {
Log.e(TAG, "保存图片");
String icon_dir=mMedialist.get(mMedialist.size()-1).getIconpath().replace("/", "__");
// String icon_dir=picName.replace("/", "__");
File dir = new File(Environment.getExternalStorageDirectory().toString()+"/movdo/clip",icon_dir );
if(!dir.exists())
if(!dir.mkdir())
Log.e(TAG, "don‘t create dir");
else
Log.i(TAG, "DIR is created");
picName=picName.replace(".mp4", ".jpg");
File f = new File(dir.getAbsolutePath(), "0.jpg");
if (f.exists()) {
f.delete();
}
try {
FileOutputStream out = new FileOutputStream(f);
bm.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
Log.i(TAG, "已经保存");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
为图片取缩略图
public Bitmap getImageThumbnail(String filename,Bitmap bmp,int width,int height)
{
Bitmap bitmap=ThumbnailUtils.extractThumbnail(bmp, 300, 300);
saveBitmap(bitmap,filename);
return bitmap;
}
为视频取缩略图
private Bitmap getVideoThumbnail(String videoPath, int width , int height){
Bitmap bitmap = null;
bitmap = ThumbnailUtils.createVideoThumbnail(videoPath, Thumbnails.MINI_KIND);
bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
String filename=new String();
saveBitmap(bitmap,mMedialist.get(mMedialist.size()-1).getItemname());
return bitmap;
}
根据路径解析进Bitmap
Bitmap thumb = BitmapFactory.decodeFile(filepath); getImageThumbnail(filename,thumb,300,300);
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原文地址：http://www.cnblogs.com/L-Arikes/p/5166478.html
