老是遇到版本对应的问题，做个笔记，再看时就不用乱找了。
Android 8. 0= API Level 26
Android 7.1.1 = API Level 25
Android 7.0 = API Level 24
Android 6.0 = API Level 23
Android 5.1.1 = API Level 22
Android 5.0.1 = API Level 21
Android 4.4W (L) = API Level 20
Android 4.4.2 = API Level 19
Android 4.3 = API Level 18
Android 4.2-4.2.2 = API Level 17
Android 4.1-4.1.1 = API Level 16
Android 4.0.3-4.0.4 = API Level 15
Android 4.0-4.0.2 = API Level 14
Android 3.2 = API Level 13
Android 3.1.x = API Level 12
Android 3.0.x = API Level 11
Android 2.3.3，2.3.4 = API Level 10
Android 2.3-2.3.2 = API Level 9
最快的方式：
