The document discusses the Android activity lifecycle and how to handle activity state changes. It explains that activities go through a defined sequence of lifecycle events like onCreate, onResume, onPause as they become visible, inactive or are destroyed. Developers need to properly prepare activities for termination or configuration changes by saving state during onPause and restoring it in onCreate to ensure a seamless user experience when an activity restarts.

1. Lesson

2. 4a.

3. Lifecycle

4. and

5. Database
도우미

6. 이찬형

7. Introduction
•Provides

8. a

9. seamless

10.
•When

11. networks

12. may

13. be

14. slow

15. or

16.
unavailable

17. Why

18. We

19. need

20. an

21. Activity

22. Lifecycle
•Resources

23. are

24. extremely

25. limited

26.
•Kills

27. low

28. priority

29. applications

30. at

31. any

32.
time

34. The

35. Android

36. Activity

37. LifeCycle

38. Active

39. and

40. Visible

41. Lifetime

42. Lifecycle

43. Events
•What

44. is

45. the

46. sequence

47. of

48. lifecycle

49. events

50. following

51. a

52. device

53.
rotation?

54.
•onPause

55.
•onStop

56.
•onCreate

57.
•onResume

58.
•onStart

59.
•onDestroy

60. How

61. to

62. prepare

63. for

64. Termination
•OnPause/OnStop

65.
•Sensor

66. Listeners

67.
•Location

68. updates

69.
•Dynamic

70. Broadcast

71. Receivers

72.
•Game

73. Physics

74. Engine

75. Maintaining

76. State
•get

77. wrong

78. if

79. you

80. don’t

81. understand

82. Good

83. Android

84. Citizen
•minimizing

85. network

86.
•works

87. seamlessly

88. between

89. offline

90. and

91.
online

92.
•creating

93. a

94. cache

95. Storing

96. Data

97. in

98. android
•network

99.
•shared

100. Preperences

101.
•SQLite

102. Database

103. Optional

104. SQLite(create)
CREATE

105. TABLE

106. weather(

108.
_id

109. INTEGER

110. PRIMARY

111. KEY,

113.
date

114. TEXT

115. NOT

116. NULL,

118.
min

119. REAL

120. NOT

121. NULL,

123.
max

124. REAL

125. NOT

126. NULL,

128.
humidity

129. REAL

130. NOT

131. NULL,

133.
pressure

134. REAL

135. NOT

136. NULL);

137. Optional

138. SQLite(insert,

139. select)
INSERT

140. INTO

141. weather

143.
VALUES(1,’20140625',16,20,0,1029);

144.
!
_id,

145. date,

146. min,

147. max,

148. humidity,

149. pressure

150.
!
SELECT

151. *

152. FROM

153. weather

154. WHERE

155. date

156. ==

157. 20140626;

158. Optional

159. SQLite(update,

160. delete)
UPDATE

161. weather

163.
SET

164. min

165. =

166. 0,

167. max

168. =

169. 100

171.
where

172. date

173. =

174. 20140626

175. AND

176. date

177. =

178. 20140627;

179.
!
DELETE

180. FROM

181. weather

182. WHERE

183. humidity

184. !=

185. 0;

186. Optional

187. SQLite(alter,

188. drop)
ALTER

189. TABLE

190. weather

192.
ADD

193. COLUMN

194. description

196.
TEXT

197. NOT

198. NULL

200.
DEFAULT

201. 'Sunny';

202.
!
DROP

203. TABLE

204. weather;

205. SQLite

206. Databases

207. Sunshine

208. Github

209. Repository
•https://github.com/udacity/Sunshine

210. Content

211. Providers

212. Overview

214. Next

215. Steps

216. Step

217. 1.

218. Create

219. Underlying

220. Data

221. Source
•Contract

222. class

223.
•SQLiteOpenHelper

224. class

225.
•test

226. code

227. Final

228. Detail

229. Wireframe

230. Weather

231. Contract
•BaseColumns

232.
•Location

233. info

234.
•forecast

235. data

236.
•foreign

237. key

238. Create

239. Databases

240. with

241. SQLiteOpenHelper
•weather

242. table

243. Create

244. 문

245. 분석

246.
•SQLiteOpenHelper

247. onUpdate()

248. method

249. JUnit

250. testing
•Cursor

251.
•Refactoring

252. Step2.

253. Create

254. the

255. ContentProvider