TryDateLibraryofAndroid

Transcript

1. Try Date Library
   of Android
   @futabooo
   

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2. futabooo(Takahiro futagawa)
   - Engineer at eureka, Inc.
   - Android Developer
   futabooo
   futabooo
   

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3. Topics
   ‣ java.util.Date and java.util.Calendar
   ‣ Android Date Library
   ‣ Joda-Time-Android
   ‣ Date4j
   ‣ ThreeTenABP
   

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4. java.util.Date
   java.util.Calendar
   

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5. java.util.Date and java.util.Calendar
   ‣ The Java classes for handling dates
   ‣ Have been mostly unchanged since JDK1.0
   ‣ And suffer from well-known issues
   ‣ for example January starts from 0 leading to many off-by-one
   bugs
   

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6. Joda-Time-Android
   ‣ Date calculation
   

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7. ‣ Date period
   Joda-Time-Android
   

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8. Joda-Time-Android
   

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9. Joda-Time-Android
   ‣ Joda-Time for Android
   ‣ Joda-Time eases the pain and tedium of manipulating
   dates and time
   ‣ Joda-Time greatly inflates its memory footprint on apps.
   ‣ Avoids the problem for Android by loading from resources instead
   of a JAR
   ‣ Has extra utilities designed for Android
   

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10. Joda-Time-Android
    ‣ Add the following dependency to build.gradle
    ‣ Initialize the library before using
    

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11. ‣ Date calculation
    Joda-Time-Android
    

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12. ‣ Date period
    Joda-Time-Android
    

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13. Date4j
    

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14. Date4j
    ‣ Eases the pain and tedium of manipulating dates and time
    ‣ Different scope from Joda-Time
    ‣ Number of classes < 10
    ‣ Works in tandem with some JDK Date classes
    ‣ Supports nanosecond resolutions
    ‣ And more
    

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15. Date4j
    ‣ Add the following dependency to build.gradle
    

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16. Date4j
    ‣ Date calculation
    

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17. Date4j
    ‣ Date period
    • Ignore hour,minitue,secounds
    

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18. ThreeTenABP
    

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19. ThreeTenABP
    ‣ An adaptation of the JSR-310 backport for Android
    ‣ JSR-310 was included in Java 8 as the java.time.* package
    ‣ Full replacement for the ailing Date and Calendar
    

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20. ThreeTenABP
    ‣ Add the following dependency to build.gradle
    ‣ Initialize the library before using
    

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21. ThreeTenABP
    ‣ Date calculation
    

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22. ThreeTenABP
    ‣ Date period
    

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23. ·ͱΊ
    ‣ java.util.Date and java.util.Calendar died
    ‣ Joda-Time-Android fat
    ‣ Date4j old
    ‣ ThreeTenABP cool
    Let’s use ThreeTenABP
    

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24. ࢀߟจݙ
    ‣ https://dzone.com/articles/game-over-jdks-date-and-time-c
    ‣ http://www.joda.org/joda-time/
    ‣ https://github.com/dlew/joda-time-android
    ‣ http://blog.danlew.net/2013/08/20/joda_time_s_memory_issue_in_android/
    ‣ http://www.date4j.net/
    ‣ https://github.com/JakeWharton/ThreeTenABP
    ‣ https://twitter.com/jakewharton/status/606158843249364993
    

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25. Thank you
    Credit: NASA Earth Observatory/NOAA NGDC
    

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