android – BitmapFactory.decodeResource()忽略jpg图像的inPreferredConfig选项

概述我尝试将jpeg资源图像加载到ARGB_8888格式的位图： BitmapFactory.Options opts = new BitmapFactory.Options();opts.inPreferredConfig = Bitmap.Config.ARGB_8888;Bitmap b = BitmapFactory.decodeResource(resources, resId, opt 我尝试将jpeg资源图像加载到ARGB_8888格式的位图：

BitmapFactory.Options opts = new BitmapFactory.Options();opts.inPreferredConfig = Bitmap.Config.ARGB_8888;Bitmap b = BitmapFactory.decodeResource(resources,resID,opts);Log.d("test",b.getConfig().toString());

这里resID是jpeg图像资源的ID.
输出为“RGB_565”.
在AndroID 2.2和2.3的模拟器中试过这个.

‘inPreferredConfig’的文档说：

If this is non-null,the decoder will try to decode into this internal
configuration. If it is null,or the request cannot be met,the
decoder will try to pick the best matching config based on the
system’s screen depth,and characteristics of the original image such
as if it has per-pixel Alpha (requiring a config that also does).
Image are loaded with the ARGB_8888 config by default.

那么我打的是“请求无法满足”的情况吗？ 总结

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