Android：onMeasure()存在问题

Question

我创建了一个自定义视图。如果我将该视图添加到布局XML文件中，并将高度设置为fill_parent，则 "specSize" 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);
}

有人知道如何获取fill_parent的高度吗？

- droid-test

Answer 1

您不需要在调用“getSize”时调用MeasureSpec.getMode。测量规范的整个概念是将测量方式（称为规范）和相关大小组合起来。请参阅MeasureSpec.makeMeasureSpec方法的文档。因此，正确的代码应该像这样：

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

- Nikolay Ivanov

Answer 2

正确的代码应该是：

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

- Nitin Rajurkar