BitmapFactory.de codeFILE出与图片2400x2400记忆 [英] BitmapFactory.decodeFile out of memory with images 2400x2400

问题描述

我需要从文件发送图像到服务器。服务器在2400x2400的分辨率请求图像。

我试图做的是：

1），使用BitmapFactory.de codeFILE使用正确的inSampleSize获取一个位图。

2）的COM preSS的JPEG图像与40％的质量

3）恩code以base64图像

4）发送到服务器

我无法实现的第一步，它抛出一个内存溢出异常。我敢肯定，inSampleSize是正确的，但我想即使有inSampleSize位图是巨大（DDMS中约30 MB）。

任何想法如何能做到这一点？我可以做这些步骤没有创建位图对象？我的意思是这样做的文件系统，而不是RAM内存。

这是当前code：

  //下面的函数计算正确的inSampleSize
位图图像= Util.de codeSampledBitmapFromFile（的ImagePath，宽，高）;
// COM pressing图像
ByteArrayOutputStream BAOS =新ByteArrayOutputStream（）;
image.com preSS（Bitmap.Com pressFormat.JPEG，40，BAOS）;
// EN code图像
字符串连接codeDIMAGE = Base64.en codeToString（baos.toByteArray（），Base64.DEFAULT））;
公共静态INT calculateInSampleSize（BitmapFactory.Options选项，诠释reqWidth，诠释reqHeight）{
    //原始高度和图像宽度
    最终诠释身高= options.outHeight;
    最终诠释宽度= options.outWidth;
    INT inSampleSize = 1;    如果（高度＆GT; reqHeight ||宽度GT; reqWidth）{        //计算的高度和宽度的比率要求的高度和宽度
        最终诠释heightRatio = Math.round（（浮点）高度/（浮点）reqHeight）;
        最终诠释widthRatio = Math.round（（浮点）宽/（浮点）reqWidth）;        //选择最小比率inSampleSize值，这将保证
        //使用两个维度大于或等于所述最终图像
        //请求的高度和宽度。
        inSampleSize = heightRatio＆LT; widthRatio？ heightRatio：widthRatio;
    }    返回inSampleSize;
}公共静态位图德codeSampledBitmapFromFile（字符串路径，INT reqWidth，诠释reqHeight）{    //首先去code。与inJustDe codeBounds = true来检查尺寸
    最后BitmapFactory.Options选项=新BitmapFactory.Options（）;
    options.inJustDe codeBounds = TRUE;
    BitmapFactory.de codeFILE（路径选择）;    //计算inSampleSize
    options.inSampleSize = calculateInSampleSize（选项，reqWidth，reqHeight）;    //德code位与inSampleSize集
    options.inJustDe codeBounds = FALSE;
    返回BitmapFactory.de codeFILE（路径选择）;
}
 

解决方案

您可以跳过ARGB_8888，并使用RGB_565代替，然后再抖动图像preserve质量好

  BitmapFactory.Options选项=新BitmapFactory.Options（）;
 options.inJustDe codeBounds = FALSE;
 options.in preferredConfig = Config.RGB_565;
 options.inDither = TRUE;
 

I need to send an image from a file to a server. The server request the image in a resolution of 2400x2400.

What I'm trying to do is:

1) Get a Bitmap using BitmapFactory.decodeFile using the correct inSampleSize.

2) Compress the image in JPEG with a quality of 40%

3) Encode the image in base64

4) Sent to the server

I cannot achieve the first step, it throws an out of memory exception. I'm sure the inSampleSize is correct but I suppose even with inSampleSize the Bitmap is huge (around 30 MB in DDMS).

Any ideas how can do it? Can I do these steps without created a bitmap object? I mean doing it on filesystem instead of RAM memory.

This is the current code:

// The following function calculate the correct inSampleSize
Bitmap image = Util.decodeSampledBitmapFromFile(imagePath, width,height);   
// compressing the image
ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 40, baos);
// encode image
String encodedImage = Base64.encodeToString(baos.toByteArray(),Base64.DEFAULT));


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 decodeSampledBitmapFromFile(String path,int reqWidth, int reqHeight) {

    // 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);
}

解决方案

you can skip ARGB_8888, and use RGB_565 instead, and then dither then images to preserve good quality

 BitmapFactory.Options options = new BitmapFactory.Options();
 options.inJustDecodeBounds = false;
 options.inPreferredConfig = Config.RGB_565;
 options.inDither = true;

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