Android从源码分析handler.post(runnable),view.post(runnable),runOnUiThread(runnable)执行时机

参考： https://blog.csdn.net/fengshenlangzi/article/details/51727264?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase

view/activity的生命周期关系

在MyActivity中布局添加一个CustomView，然后在各个回调中添加log，会有如下调用顺序：

E/MyActivity: onCreate: 
E/CustomView: onFinishInflate: 
E/MyActivity: onResume: 
E/MyActivity: onAttachedToWindow: 
E/CustomView: onAttachedToWindow: 
E/CustomView: onMeasure: 
E/CustomView: onMeasure: 
E/CustomView: onMeasure: 
E/CustomView: onSizeChanged: 
E/CustomView: onLayout: 
E/CustomView: onDraw: 
E/MainActivity: onWindowFocusChanged: true
E/CustomView: onWindowFocusChanged: true

//接下来退出Activity
E/MainActivity: onWindowFocusChanged: false
E/CustomView: onWindowFocusChanged: false
E/MyActivity: onDestroy: 
E/CustomView: onDetachedFromWindow: 
E/MyActivity: onDetachedFromWindow: 

因此如果是在 onCreate或者是onResume 里面获取View的 宽高，得到的都是0.

可以用View.post(Runnable)来延后 执行

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