android 获取适配的bitmap等相关

获取适配尺寸的图片：

File files = new File(imagePath);



				FileInputStream is = null;

				BufferedInputStream bis = null;



				BitmapFactory.Options opts = new BitmapFactory.Options();



				if (files.length() < 51200) { // 20-50k

					opts.inSampleSize = 2;

				} else if (files.length() < 307200) { // 50-300k

					opts.inSampleSize = 4;

				} else if (files.length() < 819200) { // 300-800k

					opts.inSampleSize = 6;

				} else if (files.length() < 1048576) { // 800-1024k

					opts.inSampleSize = 8;

				} else {

					opts.inSampleSize = 12;

				}



				Bitmap bitmap = BitmapFactory.decodeFile(files.getPath(), opts);

                                newBitmap = Bitmap.createScaledBitmap(bitmap, 70, 70, true);        

　　获取图片的大小：

	long size = files.length();

				DecimalFormat df = new DecimalFormat("#.00");

				String fileSizeString = "";

				if (size < 1024) {

					fileSizeString = df.format((double) size) + "B";

				} else if (size < 1048576) {

					fileSizeString = df.format((double) size / 1024) + "K";

				} else if (size < 1073741824) {

					fileSizeString = df.format((double) size / 1048576) + "M";

				} else {

					fileSizeString = df.format((double) size / 1073741824)

							+ "G";

				}