我正在使用培训材料中的 BitmapFun 在 GridView 中显示我的图像。但是代码返回的图像非常模糊。ImageResizer我在方法类的第 184 行跟踪了罪魁祸首之一decodeSampledBitmapFromDescriptor。
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
这是实际的方法
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) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while (halfHeight / inSampleSize > reqHeight && halfWidth / inSampleSize > reqWidth) {
inSampleSize *= 2;
}
// This offers some additional logic in case the image has a strange
// aspect ratio. For example, a panorama may have a much larger
// width than height. In these cases the total pixels might still
// end up being too large to fit comfortably in memory, so we should
// be more aggressive with sample down the image (=larger inSampleSize).
long totalPixels = width * height / inSampleSize;
// Anything more than 2x the requested pixels we'll sample down further
final long totalReqPixelsCap = reqWidth * reqHeight * 2;
while (totalPixels > totalReqPixelsCap) {
inSampleSize *= 2;
totalPixels /= 2;
}
}
return inSampleSize;
}
所以我想要的是不要那么激进地采样。但这会导致一些问题：既然这是加载位图的官方建议，那么将采样更改为不那么激进有什么问题？有没有人不得不更改此代码以获得更好质量的图片？我的调查是否正确？即这段代码是我的图像模糊的原因吗？这不是问题/疑问的详尽清单，但这应该让读者对我的担忧有所了解。最后：如何在不影响 BitmapFun 目的的情况下解决这个问题？显然，我去 BitmapFun 是有原因的：我的应用程序运行不正常并且经常崩溃。现在它没有崩溃，但图像太模糊了。