在Android中缩放图像会导致OutOfMemory异常

public static Bitmap loadBitmap(int resId) {  
    return BitmapFactory.decodeResource(getResources(), resId, options);
}

public static Bitmap loadBitmap(int resId) {
    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), resId, options);
    Matrix matrix = new Matrix();
    matrix.postScale(0.8f, 0.8f);
    Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    bitmap.recycle();
    bitmap = null;
    return scaledBitmap;
}

2211840-byte external allocation too large for this process.  
Out of memory: Heap Size=4935KB, Allocated=2549KB, Bitmap Size=18463KB  
VM won\'t let us allocate 2211840 bytes

Bitmap.createScaledBitmap(...)