Image 为什么图像会从顶部剪掉？

代码可以工作，但图像会从顶部修剪下来。我什么都试过了，但还是想不出来

有人能看一下吗？ 提前谢谢

代码：

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非常感谢……

在CalculatesSampleSize中，您返回的是int。根据图像的比率，此返回值很可能为0，options.inSampleSize将为0，因此不会进行缩放

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然后解码将使用您传递的大小值进行解码，因此将发生裁剪。我认为你需要用密度参数来代替。请查看

您的计算有多个代码路径。你能描述一下你用的是哪一种吗？目标与源大小相同还是存在缩放？我使用decode_imagePath_String（）；感谢您图像的大小取决于用户的选择。因此，图像可以是3000px x4000px。将发生OOM。我从其他地方下载了代码，我一直在尝试修改它，但由于某些原因，它只会从顶部修剪，而不是从其他地方修剪。您应该尝试在返回unscaledBitmap时设置断点，并验证inSampleSize是否大于1。非常感谢您的帮助。我对Android还是新手。你能给我一些代码吗？谢谢您应该学习使用调试器。我不是突然说的。掌握调试器是开发人员能够掌握的最好的技能之一。好的，谢谢你的提示。我有时间一定会调查的。关于发展，有很多东西需要学习。

public class ScalingUtilities {


 public static Bitmap decodeResource(Resources res, int resId, int ReqWidth, int ReqHeight, ScalingLogic scalingLogic) {
    Options options = new Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);
    options.inJustDecodeBounds = false;
    options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, ReqWidth,
            ReqHeight, scalingLogic);
    Bitmap unscaledBitmap = BitmapFactory.decodeResource(res, resId, options);

    return unscaledBitmap;
}


public static Bitmap decode_imagePath_String(String image_path, int ReqWidth, int ReqHeight, ScalingLogic scalingLogic) {
    Options options = new Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(image_path, options);
    options.inJustDecodeBounds = false;
    options.inSampleSize = calculateSampleSize(options.outWidth, options.outHeight, ReqWidth,
            ReqHeight, scalingLogic);
    Bitmap unscaledBitmap = BitmapFactory.decodeFile(image_path, options);

    return unscaledBitmap;
}



public static Bitmap createScaledBitmap(Bitmap unscaledBitmap, int ReqWidth, int ReqHeight,
        ScalingLogic scalingLogic) {
    Rect srcRect = calculateSrcRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),
            ReqWidth, ReqHeight, scalingLogic);
    Rect dstRect = calculateDstRect(unscaledBitmap.getWidth(), unscaledBitmap.getHeight(),
            ReqWidth, ReqHeight, scalingLogic);
    Bitmap scaledBitmap = Bitmap.createBitmap(dstRect.width(), dstRect.height(),
            Config.RGB_565);
    Canvas canvas = new Canvas(scaledBitmap);
    canvas.drawBitmap(unscaledBitmap, srcRect, dstRect, new Paint(Paint.FILTER_BITMAP_FLAG));

    return scaledBitmap;
}


public static enum ScalingLogic {
    CROP, FIT
}


public static int calculateSampleSize(int srcWidth, int srcHeight, int ReqWidth, int ReqHeight,
        ScalingLogic scalingLogic) {
    if (scalingLogic == ScalingLogic.FIT) {
        final float srcAspect = (float)srcWidth / (float)srcHeight;
        final float dstAspect = (float)ReqWidth / (float)ReqHeight;

        if (srcAspect > dstAspect) {
            return srcWidth / ReqWidth;
        } else {
            return srcHeight / ReqHeight;
        }
    } else {
        final float srcAspect = (float)srcWidth / (float)srcHeight;
        final float dstAspect = (float)ReqWidth / (float)ReqHeight;

        if (srcAspect > dstAspect) {
            return srcHeight / ReqHeight;
        } else {
            return srcWidth / ReqWidth;
        }
    }
}

public static Rect calculateSrcRect(int srcWidth, int srcHeight, int ReqWidth, int ReqHeight,
        ScalingLogic scalingLogic) {
    if (scalingLogic == ScalingLogic.CROP) {
        final float srcAspect = (float)srcWidth / (float)srcHeight;
        final float dstAspect = (float)ReqWidth / (float)ReqHeight;

        if (srcAspect > dstAspect) {
            final int srcRectWidth = (int)(srcHeight * dstAspect);
            final int srcRectLeft = (srcWidth - srcRectWidth) / 2;
            return new Rect(srcRectLeft, 0, srcRectLeft + srcRectWidth, srcHeight);
        } else {
            final int srcRectHeight = (int)(srcWidth / dstAspect);
            final int scrRectTop = (int)(srcHeight - srcRectHeight) / 2;
            return new Rect(0, scrRectTop, srcWidth, scrRectTop + srcRectHeight);
        }
    } else {
        return new Rect(0, 0, srcWidth, srcHeight);
    }
}


public static Rect calculateDstRect(int srcWidth, int srcHeight, int ReqWidth, int ReqHeight,
        ScalingLogic scalingLogic) {
    if (scalingLogic == ScalingLogic.FIT) {
        final float srcAspect = (float)srcWidth / (float)srcHeight;
        final float dstAspect = (float)ReqWidth / (float)ReqHeight;

        if (srcAspect > dstAspect) {
            return new Rect(0, 0, ReqWidth, (int)(ReqWidth / srcAspect));
        } else {
            return new Rect(0, 0, (int)(ReqHeight * srcAspect), ReqHeight);
        }
    } else {
        return new Rect(0, 0, ReqWidth, ReqHeight);
    }
  }

}