本文详细探讨了Android中View的onMeasure方法，包括MeasureSpec的三种模式（EXACTLY, AT_MOST, UNSPECIFIED），MeasureSpec的创建规则，以及在ViewGroup和View之间的调用关系。特别强调了onMeasure方法在测量View尺寸时的角色，指出MeasureSpec由父容器的MeasureSpec和子View的LayoutParams共同决定，并举例说明了如果不重写onMeasure如何影响wrap_content的支持。"
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1. MeasureSpec.EXACTLY
The parent has determined an exact size for the child. The child is going to be given those bounds regardless of how big it wants to be.
2. MeasureSpec.AT_MOST
The child can be as large as it wants up to the specified size.
3. MeasureSpec.UNSPECIFIED
The parent has not imposed any constraint on the child. It can be whatever size it wants.
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