https://github.com/codepath/android-custom-view-demos/blob/master/README.md

http://www.vogella.com/tutorials/AndroidCustomViews/article.html

https://github.com/codepath/android_guides/wiki/Basic-Painting-with-Views

2018.9.17

1.用法

https://www.jianshu.com/p/1a1491f059fc

2.用法

https://www.cnblogs.com/mengdd/p/3332882.html

3.自定義View

• create drawing objects

　　　Canvas+Paint

• handle layout events

　　　View.MeasureSpec

　　　LayoutParams

　　　onMeasure

https://developer.android.com/training/custom-views/custom-drawing

4.同樣大的面積裡會有不同個數的畫素點，這就是造成高低解析度的原因。

• pixel和dp的轉換
• 佈局大小(dp)和字型大小(sp)的單位

https://developer.android.com/training/multiscreen/screendensities

https://developer.android.com/guide/topics/graphics/drawables

https://developer.android.com/reference/android/graphics/package-summary

2018.9.20

Animator

https://blog.csdn.net/vanpersie_9987/article/details/51699595

ViewAnimator

https://blog.csdn.net/zhanhong39/article/details/78956553

https://abhiandroid.com/ui/viewanimator

ViewAnimation

https://blog.csdn.net/kisso143/article/details/52808272

https://blog.csdn.net/weixin_35791555/article/details/62883184

http://www.cnblogs.com/yc-755909659/p/4290114.html

https://github.com/daimajia/AndroidViewAnimations

https://github.com/lygttpod/AndroidCustomView

View in Camera

• 坑一

selector使用失敗

• 坑二

LayoutParams所有控制元件都可以使用LinearLayout的這個類嗎？

References

Android自定義View三(座標系與View的繪製流程)