Drawable.createFromPath nativeDecodeStream OutOfMemoryError

一般解析图片进行指定大小，这样不容易造成内存溢出
    public static Bitmap decodeBitmapFromRes(Resources res,int bmpId,int reqWidth, int reqHeight) {
        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;//设置这个，只得到能解析的出来图片的大小，并不进行真正的解析
        BitmapFactory.decodeResource(res, bmpId, options);
        // Calculate inSampleSize
        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight); //跟指定大小比较，计算缩放比例
        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false; 
        return BitmapFactory.decodeResource(res, bmpId, options);
    }

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) {
        if (width > height) {
            inSampleSize = Math.round((float)height / (float)reqHeight);
        } else {
            inSampleSize = Math.round((float)width / (float)reqWidth);
        }
    }
    return inSampleSize;
    }

参考：http://stackoverflow.com/questions/10278686/out-of-memory-fatal-exception