android - 减小从 android 中的相机捕获的图像的大小

Question

在这里，我将从相机拍摄的图像保存在 SD 卡上。此处，捕获的图像大小大于 1 MB。我想在保存到 sdcard 之前将这个大小减少到将近 500kb 到 600kb。我怎么能那样做？

try 
        {
            Bitmap mPhoto;
            mPhoto = android.provider.MediaStore.Images.Media.getBitmap(cr, CheckInGallery.mUri);
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();
            mPhoto.compress(Bitmap.CompressFormat.PNG, 100, bytes);

            File direct = new File(Environment.getExternalStorageDirectory() + "/RetailRun");
            String mydate = java.text.DateFormat.getDateTimeInstance().format(Calendar.getInstance().getTime());
            Toast.makeText(getBaseContext(), "Time :" + mydate, 5000).show();

            if(!direct.exists())
            {
                direct.mkdir();
                File file = new File(Environment.getExternalStorageDirectory()+File.separator + "/MyImage/image" + mydate +".jpg");
                file.createNewFile();
                FileOutputStream fo = new FileOutputStream(file);
                fo.write(bytes.toByteArray());
                fo.close();
             }

         else
            {
                File file = new File(Environment.getExternalStorageDirectory()+File.separator + "/MyImage/image" + mydate +".jpg");
                file.createNewFile();
                FileOutputStream fo = new FileOutputStream(file);
                fo.write(bytes.toByteArray());
                fo.close();
            }



        }

        catch (Exception e) 
        {
            Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
        }

Answer 1

mPhoto.compress(Bitmap.CompressFormat.PNG, 100, bytes);

100在这就是最好的品质。如果您想减小尺寸，请尝试减小该值

其他方法可能是使用 BitmapFactory.Options() 的 inSampleSize 参数。那也应该减小尺寸。你可以阅读 here

编辑:一些代码

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize=2; //4, 8, etc. the more value, the worst quality of image

Bitmap bmp=BitmapFactory.decodeStream(getContentResolver().openInputStream(CheckInGallery.mUri), null, options);

这应该加载质量稍差的图像。

然后保存图片

bmp.compress(Bitmap.CompressFormat.PNG, 70, bytes);