Android View绘制的三大流程

padding, int childDimension) {

int specMode = MeasureSpec.getMode(spec);

int specSize = MeasureSpec.getSize(spec);

int size = Math.max(0, specSize - padding);

int resultSize = 0;

int resultMode = 0;

switch (specMode) {

// Parent has imposed an exact size on us

case MeasureSpec.EXACTLY:

if (childDimension >= 0) {

resultSize = childDimension;

resultMode = MeasureSpec.EXACTLY;

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

// Child wants to be our size. So be it.

resultSize = size;

resultMode = MeasureSpec.EXACTLY;

} 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 has imposed a maximum size on us

case MeasureSpec.AT_MOST:

if (childDimension >= 0) {

// Child wants a specific size... so be it

resultSize = childDimension;

resultMode = MeasureSpec.EXACTLY;

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