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在任玉刚大神的书上看到的这个方法。其实Android API上也给了这个类似的代码。用来预防图片OOM的发生

public class BitmapUtil{	public BitmapUtil(){			}	public static Bitmap decodeSampleedBitmapFromResource(Resources res,int resId,int reqWidth,int reqHeight){				final Options options = new Options();		options.inJustDecodeBounds = true;				BitmapFactory.decodeResource(res, resId,options);		options.inSampleSize = calculateInSampleSize(options,reqWidth,reqHeight);		options.inJustDecodeBounds = false;		options.inPreferredConfig = Config.ARGB_8888;		options.inDither = true;		return BitmapFactory.decodeResource(res, resId, options);			}	private static int calculateInSampleSize(Options options, int reqWidth,            int reqHeight)    {	    final int height = options.outHeight;	    final int width = options.outWidth;	    int inSampleSize = 1;	    if (height>reqHeight ||width>reqWidth)        {	        final int halfHeight = height /2;	        final int halfWidth = width /2;	        while (halfHeight /inSampleSize >= reqHeight && 	        		(halfWidth / inSampleSize >= reqWidth))            {	           inSampleSize *= 2;	                        }        }	    return inSampleSize;    }}

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