Activity七个基本的生命周期方法：onCreate、onStart、onResume、onPause、onStop、onDestory，这六个生命周期方法两两相互对应，外加一个onRestart方法。
自定义View时，常需要复写的方法：onMeasure、onLayout、onDraw以及onSizeChanged、onFinishInflate。
structure=>operation: 构造方法
onAttachToWin=>operation: onAttachToWindow
onMeasure1=>operation: onMeasure
onSizeChanged=>operation: onSizeChanged
onLayout1=>operation: onLayout
onMeasure2=>operation: onMeasure
onLayout2=>operation: onLayout
onDraw=>operation: onDraw
onDetachedFromWindow=>operation: onDetachedFromWindow
structure->onAttachToWin->onMeasure1->onSizeChanged->onLayout1->onMeasure2->onLayout2->onDraw->onDetachedFromWindow
先蛮测下呗，在MainActivity中给七个生命周期方法打log；自定义FrameLayout和TextView的子类，即CustomViewGroup和CustomView，仅仅给五个生命周期方法打log；这两个自定义View直接放到Activity的xml布局中：
生命周期的执行流程
启动Activity
| 顺序 |
MainActivity |
CustonViewGroup |
CustomView |
| 1 |
onCreate before setContentView |
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| 2 |
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CustonViewGroup(ctx, attrs) |
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| 3 |
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CustomView(ctx, attrs) |
| 4 |
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onFinishInflate |
| 5 |
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onFinishInflate |
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| 6 |
onCreate after setContentView |
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| 7 |
onStart |
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| 8 |
onResume |
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| 9 |
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onMeasure |
| 10 |
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onMeasure |
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| 11 |
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onMeasure |
| 12 |
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onMeasure |
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| 13 |
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onMeasure |
| 14 |
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onMeasure |
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| 15 |
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onMeasure |
| 16 |
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onMeasure |
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| 17 |
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onSizeChanged |
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| 18 |
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onSizeChanged |
| 19 |
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onLayout |
| 20 |
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onLayout |
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| 21 |
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onMeasure |
| 22 |
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onMeasure |
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| 23 |
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onMeasure |
| 24 |
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onMeasure |
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| 25 |
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onLayout |
| 26 |
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onLayout |
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| 27 |
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onDraw |
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| 28 |
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onDraw |
按下回退键
| 顺序 |
MainActivity |
CustonViewGroup |
CustomView |
| 1 |
onPause |
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| 2 |
onStop |
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| 3 |
onDestroy |
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重新进入MainActivity并按下Home键
| 顺序 |
MainActivity |
CustonViewGroup |
CustomView |
| 1 |
onPause |
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| 2 |
onStop |
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回到MainActivity
| 顺序 |
MainActivity |
CustonViewGroup |
CustomView |
| 1 |
onRestart |
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| 2 |
onStart |
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| 3 |
onResume |
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| 4 |
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onDraw |
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| 5 |
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onDraw |
onFinishInflate
| 顺序 |
CustonViewGroup |
CustomView |
| 1 |
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onFinishInflate |
| 2 |
onFinishInflate before |
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| 3 |
onFinishInflate after |
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onMeasure
| 顺序 |
CustonViewGroup |
CustomView |
| 1 |
onMeasure before |
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| 2 |
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onMeasure |
| 3 |
onMeasure after |
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onSizeChanged和onLayout
| 顺序 |
CustonViewGroup |
CustomView |
| 1 |
onSizeChanged before |
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| 2 |
onSizeChanged after |
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| 3 |
onLayout before |
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| 4 |
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onSizeChanged |
| 5 |
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onLayout |
| 6 |
onLayout after |
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onDraw
| 顺序 |
CustonViewGroup |
CustomView |
| 1 |
onDraw before |
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| 2 |
onDraw after |
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| 3 |
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onDraw |
