Avoid redundant codes to deal with application version upgrading task.

1. Version Management
@KeithYokoma - Drivemode, Inc.
potatotips #11

2. KeithYokoma
Keishin Yokomaku
Drivemode, Inc.
Android Engineer
GitHub: https://github.com/KeithYokoma
e-Book: http://amzn.to/1mZNydv

3. When your application is updated…

4. You may…
• Change database scheme
• Write new preferences
• Migrate to new data models
• Trigger data synchronization
• and so on…

5. It could happen!
int current = // get current version code from PackageManager
int previous = // read previous version from Preference
if (current <= previous) { return; }
if (previous < 1) {} // do when the app is updated from 0
if (previous < 2) {} // do when the app is updated from 0 or 1
if (previous < 3) {} // do when the app is updated from 0 ~ 2
if (previous < 4) {}
if (previous < 5) {}
if (previous < 6) {}

6. It could happen!
int current = // get current version code from PackageManager
int previous = // read previous version from Preference
if (current <= previous) { return; }
if (previous < 1) {} // do when the app is updated from 0
if (previous < 2) {} // do when the app is updated from 0 or 1
if (previous < 3) {} // do when the app is updated from 0 ~ 2
if (previous < 4) {}
if (previous < 5) {}
if (previous < 6) {}

7. Too many “if” statement!
int current = // get current version code from PackageManager
int previous = // read previous version from Preference
if (current <= previous) { return; }
if (previous < 1) {} // do when the app is updated from 0
if (previous < 2) {} // do when the app is updated from 0 or 1
if (previous < 3) {} // do when the app is updated from 0 ~ 2
if (previous < 4) {}
if (previous < 5) {}
if (previous < 6) {}

8. Just fit for you
https://github.com/KeithYokoma/Fit

9. Fit
• Annotation based
• Automatically call your procedure
• Reusable method declaration
• No more dull “if” statement

10. Version Module class
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

11. Version Module class
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

12. Version Module class
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

13. Application class
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Fit.initialize(this, new MyModule());
Fit.getInstance().execute();
}
}

14. Application class
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Fit.initialize(this, new MyModule());
Fit.getInstance().execute();
}
}

15. Application class
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Fit.initialize(this, new MyModule());
Fit.getInstance().execute();
}
}

16. That’s it!

17. Behaviour
Version 1 to 4
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

18. Behaviour
Version 1 to 4
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

19. Behaviour
Version 1 to 4
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

20. Behaviour
Version 1 to 4
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

21. Behaviour
Version 1 to 4
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

22. Behaviour
Version 3 to 4
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

23. Behaviour
Version 3 to 4
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

24. Behaviour
Version 3 to 4
public class MyModule implements VersionModule {
// foo() is called when the app is updated to
// version code = 1, 2 and 3
@VersionCode({1, 2, 3})
public void foo() {}
// bar() is called when the app is updated to version code = 4
@VersionCode(4)
public void bar() {}
}

25. Version Management
@KeithYokoma - Drivemode, Inc.
potatotips #11