Android bitmap.getwidth 返回 null？

发布于 2024-11-29 13:45:27 字数 419 浏览 1 评论 0原文

我想在加载位图后获取其宽度，并且我正在使用这段代码，其中 mybackground 是一个等于 R.drawable.background 的 int 。

background=BitmapFactory.decodeResource(context.getResources(),mybackground );

scalefactorbackx=WindowInfo.Width/background.getWidth();
scalefactorbacky=WindowInfo.Height/background.getHeight();

到目前为止，它在这一行返回一个空指针异常。我必须做一些根本上错误的事情才会失败。我读到的在线教程似乎只是调用 .getWidth() 函数，并且它应该可以工作。

谢谢

原文

I want to get the width of a bitmap after loading it and i am using this code where mybackground is an int that is equal to R.drawable.background.

background=BitmapFactory.decodeResource(context.getResources(),mybackground );

scalefactorbackx=WindowInfo.Width/background.getWidth();
scalefactorbacky=WindowInfo.Height/background.getHeight();

So far it returns a null pointer exception on this line. I have to be doing something fundamentally wrong for this to fail. Tutorials online that I read appeared to just call the .getWidth() function and it was suppose to work.

Thanks

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