Java 使用毕加索将图像调整为全宽和固定高度

Resize image to full width and fixed height with Picasso

提问by David Rabinowitz

I have a vertical LinearLayout where one of the items is an ImageViewloaded using Picasso. I need to rise the image's width to the full device width, and to display the center part of the image cropped by a fixed height (150dp). I currently have the following code:

我有一个垂直的 LinearLayout，其中一个项目是ImageView使用毕加索加载的。我需要将图像的宽度增加到整个设备宽度，并显示按固定高度 (150dp) 裁剪的图像的中心部分。我目前有以下代码：

Picasso.with(getActivity()) 
    .load(imageUrl) 
    .placeholder(R.drawable.placeholder) 
    .error(R.drawable.error) 
    .resize(screenWidth, imageHeight)
    .centerInside() 
    .into(imageView);

Which values should I put into screenWidthand imageHeight(=150dp)?

我应该将哪些值放入screenWidthand imageHeight(=150dp)？

采纳答案by Jake Wharton

You are looking for:

您正在寻找：

.fit().centerCrop()

What these mean:

这些是什么意思：

• fit- wait until the ImageViewhas been measured and resize the image to exactly match its size.
• centerCrop- scale the image honoring the aspect ratio until it fills the size. Crop either the top and bottom or left and right so it matches the size exactly.

• fit- 等到ImageView已经测量并调整图像大小以完全匹配其大小。
• centerCrop- 按照纵横比缩放图像，直到它填满尺寸。裁剪顶部和底部或左右，使其大小完全匹配。

回答by Umut ADALI

In some case the fit() is useless. Before you must wait for the width and height measurement to end. So you can use globallayoutlistener. for example;

在某些情况下， fit() 是无用的。在您必须等待宽度和高度测量结束之前。所以你可以使用 globallayoutlistener。例如;

imageView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                Picasso.with(getActivity())
                        .load(imageUrl)
                        .placeholder(R.drawable.placeholder)
                        .error(R.drawable.error)
                        .resize(screenWidth, imageHeight)
                        .fit
                        .centerInside()
                        .into(imageView);
                imageView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
            }
        });