View绘制的三部曲, 测量,布局,绘画
今天我们分析测量过程
view的测量是从ViewRootImpl发起的,View需要重绘,都是发送请求给ViewRootImpl,然后他组织重绘
在重绘的过程中,有一步就是测量,通过代码来分析测量过程
private boolean measureHierarchy(final View host, final WindowManager.LayoutParams lp, final Resources res, final int desiredWindowWidth, final int desiredWindowHeight) { int childWidthMeasureSpec; int childHeightMeasureSpec; boolean windowSizeMayChange = false; if (DEBUG_ORIENTATION || DEBUG_LAYOUT) Log.v(TAG, "Measuring " + host + " in display " + desiredWindowWidth + "x" + desiredWindowHeight + "..."); boolean goodMeasure = false; if (lp.width == ViewGroup.LayoutParams.WRAP_CONTENT) { // On large screens, we don't want to allow dialogs to just &n