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";
				}