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//压缩图片
public Bitmap compressBitmap(int i) throws IOException {
// 尺寸压缩倍数,值越大，图片尺寸越小
int ratio = 2;
// 压缩Bitmap到对应尺寸
Bitmap bmp =BitmapFactory.decodeByteArray(items.get(i).getImageAsBytes(), 0, items.get(i).getImageAsBytes().length);
Bitmap result = Bitmap.createBitmap(bmp.getWidth() / ratio, bmp.getHeight() / ratio, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(result);
Rect rect = new Rect(0, 0, bmp.getWidth() / ratio, bmp.getHeight() / ratio);
canvas.drawBitmap(bmp, null, rect, null);
return result;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
String path = Environment.getExternalStorageDirectory()+ "/Image/";
File dirFile= new File(path);
//目录转化成文件夹
if (!dirFile .exists()) {//如果不存在，建立这个文件夹
dirFile .mkdirs();
}
//保存图片到文件夹
File file = new File(path, items.get(i).getMessage()+ ".jpg");
try {
FileOutputStreamout = new FileOutputStream(file);
// 把压缩后的数据存放到out中
result.compress(Bitmap.CompressFormat.JPEG, 100 ,out);
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
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