ViewRootImpl對象=>performTraversals()
private void performTraversals() {
//上下近800行代碼坛掠。
performMeasure();
performLayout();
performDraw();
}
private void performMeasure(int childWidthMeasureSpec, int childHeightMeasureSpec) {
//mView是DecorView對象
mView.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
layout和draw同理，下面是measure,layout,draw的機制==>
measure
layout
draw
