ImageView 是动态宽度的正方形? [英] ImageView be a square with dynamic width?

问题描述

我有一个 GridView，里面有 ImageViews.我每行有 3 个.我可以使用 WRAP_CONTENT 和 scaleType = CENTER_CROP 正确设置宽度，但我不知道如何将 ImageView 的大小设置为正方形.这是我到目前为止所做的，除了高度之外似乎还可以，即静态":

I have a GridView with ImageViews inside. I have 3 of them for each row. I can set correctly the width with WRAP_CONTENT and scaleType = CENTER_CROP, but I don't know how to set the ImageView's size to be a square. Here's what I did until now, it seems to be ok except the height, that is "static":

imageView = new ImageView(context);     
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setLayoutParams(new GridView.LayoutParams(GridView.LayoutParams.WRAP_CONTENT, 300));

我是在适配器内部进行的.

I'm doing it inside an adapter.

推荐答案

最好的选择是自己继承ImageView，覆盖measure pass:

The best option is to subclass ImageView yourself, overriding the measure pass:

public class SquareImageView  extends ImageView {

  ...

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    int width = getMeasuredWidth();
    setMeasuredDimension(width, width);
  }

  ...

}

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