关于通过getWidth与getHeight获取bitmap​的尺寸与其实际尺寸不符合问题

很简单的代码测试一个图片的尺寸：

        Bitmap img1 = BitmapFactory.decodeResource(getResources(), R.drawable.bg);
        int w = img1.getWidth();
        int h = img1.getHeight();
        System.out.printf("++++++++++++++++++ w=" + w + " h=" + h);

但有时会发现获取的尺寸比其实际尺寸要大1/3（如原图是300x300，则上面代码返回的是400x400）

要是突然遇到这种问题有时是会让人有些抓狂的。。。

具体原因可能是选择的虚拟机类型变了导致的（还不太确定），解决方法如下：

You have two options, use the BitmapFactory + BitmapFactory.Options like this:

BitmapFactory.Options bfoOptions = new BitmapFactory.Options();
bfoOptions.inScaled = false;
BitmapFactory.decodeResource( rMgr, ResID, bfoOptions );

Or you can put all the resources you don't want scaled in the drawable-nodpi
directory here:

Project/res/drawable-nodpi/resource.png

I've used them both and they seem to both work equally well. If you want the
option of deciding to scale or not via a preference or similar, the code
edition would probably be the better choice.

示例代码：

    	BitmapFactory.Options bfoOptions = new BitmapFactory.Options();
    	bfoOptions.inScaled = false; 
    	Bitmap img1 = BitmapFactory.decodeResource(getResources(), R.drawable.sb, bfoOptions); 
        w = img1.getWidth();
        h = img1.getHeight(); 
        System.out.printf("++++++++++++++++++ w=" + w + " h=" + h);

这次得到绝对是正确的！
当然了，根据上面提示也可以自建一个drawable-nodpi目录存放文件（测试是可以的，貌似更简单！）

还有一点：直接从文件系统中解析图片文件（如/sdcard/test.jpg）好像不受影响，获得width/height都是正常的。

更多描述：groups.google.com/group/android-develope...f4?#9be5b95022d17df4