安卓: onMeasure()的问题

Question

我做了一个自定义视图。如果我将视图添加到布局XML文件中，并将高度设置为fill_parent "specSize“，则返回0。为什么？

代码：

    @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int measuredHeight = 90;

        int specMode = MeasureSpec.getMode(heightMeasureSpec);
        int specSize = MeasureSpec.getSize(MeasureSpec.getMode(heightMeasureSpec));

        if(specMode != MeasureSpec.UNSPECIFIED){
         measuredHeight = specSize;
        }
        setMeasuredDimension(60, measuredHeight);
}

有人知道怎样才能得到fill_parent的高度吗

Answer 1

你不需要在“getSize”的调用中调用MeasureSpec.getMode。测量规范的全部思想是将测量方法(称为规范)和相关的大小结合起来。有关MeasureSpec.makeMeasureSpec method.So的正确代码，请参阅文档，如下所示：

int widthSpec = MeasureSpec.getMode(widthMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);

Answer 2

正确的代码是：

int specMode = MeasureSpec.getMode(heightMeasureSpec);     ----This was already correct
int specSize = MeasureSpec.getSize(heightMeasureSpec);     ----This is corrected.