Fix "argetSdkVersion" to "targetSdkVersion"
Update database.md
“再其他地方调用了finish()方法" 改为”在其他地方调用了finish()方法“
Merge pull request #127 from Lin-H/master

提交部分校对
Merge pull request #128 from sweetIan/patch-1

Update database.md
Merge pull request #8 from kesenhoo/master

合并更新
校对1.1.2节

修正部分格式
校对1.1.2节

修改错字
校对1.1.3节

修正部分格式
Merge branch 'master' of https://github.com/Lin-H/android-training-course-in-chinese