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我想将从相机拍摄的照片发送到服务器。但它的大小约为 1M，我相信它是两个多。因此我想减小照片的大小。下面是我正在使用的方法。
saveFile- 只需将位图保存到文件并返回路径即可。
calculateInSampleSize返回inSampleSize以将照片描述调整为已选择。
decodeSampledBitmapFromResource从文件中解码 birmap 并使用新参数重建它。
一切都很好，但似乎不起作用。small3.png 的尺寸为 1240*768*24，大小仍为 ~1M。

我称之为 

photo = saveFile(decodeSampledBitmapFromResource(picturePath,
                    800, 800),3);

方法

public String saveFile(Bitmap bm,int id) {
        String file_path = Environment.getExternalStorageDirectory()
                .getAbsolutePath() + "/Mk";
        File dir = new File(file_path);
        if (!dir.exists())
            dir.mkdirs();
        File file = new File(dir, "smaller" + id + ".png");
        FileOutputStream fOut;
        try {
            fOut = new FileOutputStream(file);
            bm.compress(Bitmap.CompressFormat.PNG, 85, fOut);
            fOut.flush();
            fOut.close();


            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        return file.getPath();

    }

    public static int calculateInSampleSize(BitmapFactory.Options options,
            int reqWidth, int reqHeight) {
        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            // Calculate ratios of height and width to requested height and
            // width
            final int heightRatio = Math.round((float) height
                    / (float) reqHeight);
            final int widthRatio = Math.round((float) width / (float) reqWidth);

            // Choose the smallest ratio as inSampleSize value, this will
            // guarantee
            // a final image with both dimensions larger than or equal to the
            // requested height and width.
            inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
        }

        return inSampleSize;
    }
public static Bitmap decodeSampledBitmapFromResource(String path,
            int reqWidth, int reqHeight) {
        Log.d("path", path);
        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, reqWidth,
                reqHeight);

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(path, options);
    }
4

2 回答 2

1

为什么你要写两次图像只需一次完成

我所做的

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 4;

Bitmap myBitmap = BitmapFactory.decodeFile({ImagePath}, options);
FileOutputStream fileOutputStream = new FileOutputStream({ImagePath});
BufferedOutputStream bos = new BufferedOutputStream(fileOutputStream);
myBitmapClose.compress(CompressFormat.JPEG, imageQuality, bos);
if (bos != null) {
    bos.flush();
    bos.close();
}
if (fileOutputStream != null) {
    fileOutputStream.flush();
    fileOutputStream.close();
}

它肯定会压缩介意线

 myBitmapClose.compress(CompressFormat.JPEG, imageQuality, bos);

在哪里设置 imageCompression 类型CompressFormat.JPEG

于 2013-08-01T07:58:49.917 回答
0

那是我的代码...我想减小路径为字符串的图像的大小。

String pics=(arraylist.get(position).getImage()); 
try{ 
   BitmapFactory.Options op = new BitmapFactory.Options(); 
   op.inJustDecodeBounds = true; 
   //op.inSampleSize = 20; op.outWidth = 25; 
   op.outHeight = 35; 
   bmp = BitmapFactory.decodeFile(pics); 
   image.setImageBitmap(bmp); 
 }catch(Exception e) {
 }
于 2014-08-01T05:30:33.680 回答