Android中如何实现一个宽和高都等于【屏幕宽度】的正方形控件？

Answer 1

//测量

    @Override

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int widthSize = MeasureSpec.getSize(widthMeasureSpec);

        int widthMode = MeasureSpec.getMode(widthMeasureSpec);

        int highSize = MeasureSpec.getSize(heightMeasureSpec);

        int highMode = MeasureSpec.getMode(heightMeasureSpec);

        int width = Math.min(widthSize,highSize); //获取最小值来实现正方形布局

        //防止出现尺寸为0不显示

        if (widthMode == MeasureSpec.UNSPECIFIED){

            width = highSize;

        }else if (highMode == MeasureSpec.UNSPECIFIED){

            width = widthSize;

        }

        setMeasuredDimension(width, width); //设置宽高 即正方形布局