Android Bitmap bigger than heapSize

Question

我收到错误：java.lang.OutOfMemoryError: bitmap size exceeds VM budget(Heap Size=12295KB, Allocated=3007KB, Bitmap Size=15621KB)

位图大小大于我的堆大小。那么如何使位图更小呢？这是它崩溃的代码：

private Bitmap getPicture(int position) {
    Bitmap bmpOriginal = BitmapFactory.decodeFile(mFileLocations.get(position));
    Bitmap bmResult = Bitmap.createBitmap(bmpOriginal.getWidth(), bmpOriginal.getHeight(), Bitmap.Config.RGB_565);
    Canvas tempCanvas = new Canvas(bmResult);
    tempCanvas.rotate(90, bmpOriginal.getWidth()/2, bmpOriginal.getHeight()/2);
    tempCanvas.drawBitmap(bmpOriginal, 0, 0, null);
    bmpOriginal.recycle();
}

它崩溃在行：

 Bitmap bmResult = Bitmap.createBitmap(bmpOriginal.getWidth(), bmpOriginal.getHeight(), Bitmap.Config.RGB_565);

和我的解码文件：

private Bitmap decodeFile(String 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) {
        Log.d(LOG_TAG, "Failed to decode file");
    }
    return null;
}

Answer 1

缩小映像以符合 VM 预算...

BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile( filename, options );
        options.inJustDecodeBounds = false;
        options.inSampleSize = 4; 
        bitmap = BitmapFactory.decodeFile( filename, options );
        if ( bitmap != null ) {
            bitmap = Bitmap.createScaledBitmap( bitmap, width, height, false );
        }

将样本大小更改为您想要的任何内容，例如 2、4、6、8 等。

有关完整的详细信息，请参阅最近发布的Android开发人员网站，它清楚地说明了您需要做什么才能达到虚拟机预算。

Answer 2

两件事：

您似乎使用的是BitmapFactory.decodeFile方法，而不是您发布的方法。

此外，看起来您唯一要保留的信息bmpOriginal是它的尺寸。那么，为什么不像在decodeFile方法中那样使用BitmapFactory.inJustDecodeBounds呢？ 或者，在创建新位图之前，只需回收位图，同时保留其尺寸，如下所示：

int width = bmpOriginal.getWidth();
int height = bmpOriginal.getHeight();
bmpOriginal.recycle();
Bitmap bmResult = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);

Answer 3

这最近在AndroidDevelopers+中有所介绍：

https://plus.google.com/103125970510649691204/posts/1oSFSyv3pRj