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";
}