Two ways to get picture thumbnails on Android

1.

/** * Using the content provider to get picture thumbnails disadvantages: You must update your media library to see the latest thumbnails * @param context * @param cr * @param Imagepath * @return */public Stati C Bitmap Getimagethumbnail (context context, Contentresolver CR, String Imagepath) {Contentresolver TESTCR = Co            Ntext.getcontentresolver ();            string[] projection = {MediaStore.Images.Media.DATA, mediastore.images.media._id,};            String Whereclause = MediaStore.Images.Media.DATA + "= '" + Imagepath + "'";            cursor cursor = testcr.query (MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, whereclause,null, null);            int _id = 0;            String ImagePath = "";            if (cursor = = NULL | | Cursor.getcount () = = 0) {return null;                    }else if (Cursor.movetofirst ()) {int _idcolumn = Cursor.getcolumnindex (mediastore.images.media._id);                    int _datacolumn = Cursor.getcolumnindex (MediaStore.Images.Media.DATA);                         do {   _id = Cursor.getint (_idcolumn);                    ImagePath = cursor.getstring (_datacolumn);            } while (Cursor.movetonext ());            } cursor.close ();            Bitmapfactory.options Options = new Bitmapfactory.options ();            Options.indither = false;            Options.inpreferredconfig = Bitmap.Config.RGB_565;            Bitmap Bitmap = MediaStore.Images.Thumbnails.getThumbnail (CR, _id, images.thumbnails.mini_kind,options);    return bitmap; }

2, manually with the specified wide-height acquisition

Cons: More Time consuming

private void Getimagethumbnail (String imagepath,int width,int height) {Bitmap Img_bitmap = null;//Save Memory Options.inpreferr Edconfig = bitmap.config.argb_4444;/* setting allows decoder to be decoded in the best way */options.inpurgeable = True;options.ininputshareable = True;o  Ptions.injustdecodebounds = true; If Dither is true, the decoder would attempt to dither the decoded imageoptions.indither = false;//do not take picture jitter processing//Get the width and height of this picture , note that the bitmap here is null Img_bitmap = Bitmapfactory.decodefile (params[0], options); options.injustdecodebounds = false;//is set to  False//calculates the scaling ratio 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) {is = 1;  }options.insamplesize = be; Re-read into the picture, read the scaled bitmap, note this time to set Options.injustdecodebounds to False img_bitmap = Bitmapfactory.decodefile (Params[0],  Options); Use Thumbnailutils to create thumbnails, where you specify which bitmap object to scale Img_bitmap = Thumbnailutils.extractthumbnail (img_bitmap, width, height, thumbnailutils.options_recycle_input); return img_bitmap;}

Two ways to get picture thumbnails on Android