Android View绘制的三大流程

} else if (childDimension == LayoutParams.MATCH_PARENT) {

// Child wants to be our size, but our size is not fixed.

// Constrain child to not be bigger than us.

resultSize = size;

resultMode = MeasureSpec.AT_MOST;

} else if (childDimension == LayoutParams.WRAP_CONTENT) {

// Child wants to determine its own size. It can't be

// bigger than us.

resultSize = size;

resultMode = MeasureSpec.AT_MOST;

}

break;

// Parent asked to see how big we want to be

case MeasureSpec.UNSPECIFIED:

if (childDimension >= 0) {

// Child wants a specific size... let him have it

resultSize = childDimension;

resultMode = MeasureSpec.EXACTLY;

} else if (childDimension == LayoutParams.MATCH_PARENT) {

// Child wants to be our size... find out how big it should

// be

resultSize = View.sUseZeroUnspecifiedMeasureSpec ? 0 : size;

resultMode = MeasureSpec.UNSPECIFIED;

} else if (childDimension == LayoutParams.WRAP_CONTENT) {

// Child wants to determine its own

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