位图内存问题 [英] Bitmap Out Of Memory Issues

问题描述

我的问题

我带着我的Andr​​oid设备中的图片。然后我去code从文件中的图片。

I take a picture with my android device. I then decode that picture from file.

        Bitmap photo = BitmapFactory.decodeFile(EXTERNAL_IMAGE_PATH+File.separator+this._currentPhotoName+JPEG_FILE_SUFFIX);
        if (photo == null && data != null) 
            photo = (Bitmap) data.getExtras().get("data");
        else if (data == null && photo == null)
            Log.e("CCPhotoManager","Can't find image from file or from intent data.");

我然后检查照片，看看它是否需要被旋转到正确的方向。

I then check that picture and see whether it needs to be rotated to the correct orientation.

             try {
                ExifInterface exif = new ExifInterface(EXTERNAL_IMAGE_PATH+File.separator+this._currentPhotoName+JPEG_FILE_SUFFIX);
                int rotation = CCDataUtils.exifToDegrees(exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,ExifInterface.ORIENTATION_NORMAL));
                Log.v("CCPhotoManager", "Rotation:"+rotation);
                if (rotation > 0) {
                    photo = this.convertSavedImageToCorrectOrientation(EXTERNAL_IMAGE_PATH+File.separator+this._currentPhotoName+JPEG_FILE_SUFFIX, photo, rotation);
                }
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

如果确实需要旋转我调用此方法。

If it does need rotating I call this method.

public Bitmap convertSavedImageToCorrectOrientation(String filePath,Bitmap photo,int rotation) {
        Log.d("CCPhotoManager", "Changing Orientation of photo located at: "+filePath+" Rotating by:"+rotation);
        int width = photo.getWidth();
        int height = photo.getHeight();


        Matrix matrix = new Matrix();
        matrix.preRotate(rotation);

        Bitmap adjusted = Bitmap.createBitmap(photo, 0, 0, width, height, matrix, true);

        try {
               FileOutputStream out = new FileOutputStream(filePath);
               adjusted.compress(Bitmap.CompressFormat.JPEG, 100, out);
        } catch (Exception e) {
               e.printStackTrace();
        }

        return adjusted;
    }

我收到的内存不足投诉，如果 convertSavedImageToCorrectOrientation 被称为上线位图进行调整，Bitmap.createBitmap （照片，0,0，宽，高，矩阵，真）;

I am getting Out of Memory complaints if the convertSavedImageToCorrectOrientation is called on the line Bitmap adjusted = Bitmap.createBitmap(photo,0,0,width,height,matrix,true);

这是只在三星Galaxy S3 的情况。它工作正常的三星Galaxy王牌， HTC Hero的和索尼Xperia U 。

This is only the case on the Samsung Galaxy S3. It works fine on the Samsung Galaxy Ace, HTC Hero and the Sony Xperia U.

下面是错误。

10-17 14:33:33.950: E/AndroidRuntime(12556): java.lang.OutOfMemoryError
10-17 14:33:33.950: E/AndroidRuntime(12556):    at android.graphics.Bitmap.nativeCreate(Native Method)
10-17 14:33:33.950: E/AndroidRuntime(12556):    at android.graphics.Bitmap.createBitmap(Bitmap.java:605)
10-17 14:33:33.950: E/AndroidRuntime(12556):    at android.graphics.Bitmap.createBitmap(Bitmap.java:551)

这是内存的海量了。

It's a massive amount of memory too.

10-17 14:33:33.945: E/dalvikvm-heap(12556): Out of memory on a 31961104-byte allocation.

我认为它是与位图周围的人的数量，但我​​不知道如何阻止这种情况发生的错误。

I think its something to do with the amount of Bitmaps around but I'm not sure how to stop this error from happening.

我知道你可以叫 .recycle（）; 上他们，但它似乎并没有正常工作

I know you can call .recycle(); on them but it doesn't seem to work.

我的提问

我如何正确地处理我的位图，所以我没有这个OOM问题？

How do I correctly handle my Bitmaps so I don't have this OOM problem?

在此先感谢

推荐答案

有关内存不足的问题。

//德$ C $连拍影像，并对其进行缩放以减少内存消耗

//decodes image and scales it to reduce memory consumption

private Bitmap decodeFile(File f){

try {
    //Decode image size
    BitmapFactory.Options o = new BitmapFactory.Options();
    o.inJustDecodeBounds = true;
    BitmapFactory.decodeStream(new FileInputStream(f),null,o);

    //The new size we want to scale to
    final int REQUIRED_SIZE=70;

    //Find the correct scale value. It should be the power of 2.
    int scale=1;
    while(o.outWidth/scale/2>=REQUIRED_SIZE && o.outHeight/scale/2>=REQUIRED_SIZE)
        scale*=2;

    //Decode with inSampleSize
    BitmapFactory.Options o2 = new BitmapFactory.Options();
    o2.inSampleSize=scale;
    return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}

这篇关于位图内存问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！