Use of libraries gives you speed and smaller error rate than writing everything by yourself. Learn from Timber through Picasso, ButterKnife to RoboSpice, Dagger2 and few other libs about modern approach to build Android apps that make your customers happy.

1. Don’t reinvent the wheel
Modern Android Stack

2. Paweł Junak

3. Libs:
● Timber
● Butterknife
● Picasso
● RoboSpice
+ Retrofit
● ORMLite
● Lombok
● Parceler
● Dagger2

4. Open Source Bar

5. Timber
never again:
deleting logs from
production app

6. Timber
if (BuildConfig.DEBUG) {
Timber.plant(new Timber.
DebugTree());
}

7. Timber
Timber.d("Downloading URL: %s", url);

8. Butterknife
never again:
findViewById()

9. Butterknife
EditText email = (EditText)
findViewById(R.id.email)

10. Butterknife
@Bind(R.id.email)
EditText email;

11. Butterknife
never again:
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
doStuff()
}
});

12. Butterknife
@onClick(R.id.button)
public void doStuff(View v)

13. Butterknife
@onClick(R.id.button)
public void doStuff()

14. Butterknife
@onClick(R.id.button)
public void doStuff(Button b) {
button.setText(); }

15. Butterknife
ButterKnife.bind(this);
● OnCreate
ButterKnife.bind(this, view);
● onViewCreated(View v, Bundle b),
● ViewHolder(View v):

16. Picasso
never again:
AsyncTask with HttpConnection
downloading image

17. Picasso
Picasso
.with(context)
.load(url)
.into(imageView);

18. Picasso
Picasso.with(context)
.load(url)
.placeholder(R.drawable.placeholder)
.error(R.drawable.placeholder_error)
.into(imageView);

19. Picasso
Picasso.with(context)
.load(url)
.resize(50, 50)
.centerCrop()
.into(imageView);

20. RoboSpice + Retrofit
never again:
AsyncTask with HttpConnection

21. RoboSpice
never again:
AsyncTask

22. RoboSpice

23. RoboSpice

24. Retrofit
never again:
HttpConnection

25. Retrofit
public interface GitHubService {
@GET("/users/{user}/repos")
List<Repo> listRep(@Path("user") String u);
}

26. Retrofit
@Headers("Cache-Control: max-age=640000")
@Headers({
"Accept: application/vnd.github.v3.full+json",
"User-Agent: Retrofit-Sample-App"
})

27. Retrofit
@GET(/users)
void getUser(@Header("Auth") String auth);

28. Retrofit
@GET("/group/{id}/users")
List<User> groupList(@Path("id") int groupId,
@Query("sort") String sort);

29. Retrofit
RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint("https://api.github.com")
.build();

30. Retrofit
GitHubService serv =
RestAdapter.create(GitHubService.class);
List<Repo> repos = service.listRepos("octocat");

31. Retrofit
POJO
public class Repo {
int id;
String name;
}

32. RoboSpice + Retrofit
@Override
public void onRequestSuccess(Repo repo) {
// TODO forkAll
}
@Override
public void onRequestFailure(SpiceException ex) {
// TODO fail
}

33. Mention
Retrofit 2 coming

34. ORMLite
never again:
SQL

35. ORMLite
@DatabaseTable(tableName = "repo")
public class Repo {
@DatabaseField(id = true)
int id;
@DatabaseField(canBeNull = false)
String name;
}

36. ORMLite
No Args Constructor needed
public Repo() {};

37. ORMLite
class DbHelper extends OrmLiteSqliteOpenHelper
onCreate(SQLiteDatabase db, ConnectionSource cS) {
TableUtils.createTable(cS, Repo.class);
}

38. ORMLite
class DbHelper extends OrmLiteSqliteOpenHelper
Dao<Repo,Integer> getDao() {
return getDao(Repo.class)
}

39. ORMLite
class MainAct extends OrmLiteBaseActivity<DbHelper>
Dao<Repo,Integer> repoDao = getHelper.getDao();

40. ORMLite
Repo repo = new Repo(id, name);
repoDao.create(repo);

41. ORMLite
Repo repo = repoDao.queryForId(id);

42. ORMLite
module in RoboSpice :)

43. Mention
yahoo - squidb
square - sqlbrite

44. Lombok
never again:
boilerplate getters,
setters, constructors

45. Lombok
@Getter
@Setter
public class Repo {
int id;
String name;
}

46. Lombok
public class Repo {
@Getter
int id;
@Setter
String name;
}

47. Lombok
@NoArgsConstructor
public class Repo {
int id;
String name;
}

48. Lombok
@Data
public class Repo {
int id;
String name;
}

49. Parceler
never again:
public static final Creator<Repo> CREATOR =
new Creator<Repo> {
public Repo createFromParcel(Parcel source);
public Repo[] newArray(int size);
}
public void writeToParcel(Parcel dest, int flags);

50. Parceler
@Parcel
public class Repo

51. Parceler
Parcelable pr = Parcel.wrap(new Repo())
Repo repo = Parcel.unwrap(pr)

52. Lombok
@Getter
@Setter
@NoArgsConstructor
@Parcel
@DatabaseTable(tableName = "repo")
public class Repo {
@DatabaseField(id = true)
int id;
@DatabaseField(canBeNull = false)
String name;
}

53. Dagger2
never again:
init SharedPreferences

54. Dagger2
@Inject
SharedPreferences prefs;

55. Dagger2
@Module
class Utils
@Provides
SharedPreferences provideSharedPreferences(){
return context.getSharedPreferences("pref",
Context.MODE_PRIVATE);
}

56. Dagger2
tools.saveMail(mail);
tools.getMail();
tools.saveToken(token);
tools.getToken();

57. Dagger2
@Provides
Tools provideTools(){
return new Tools();
}

58. Dagger2
@Inject
Tools tools;

59. Summary:
● Butterknife
● Picasso
● RoboSpice
+ Retrofit
● ORMLite
● Lombok
● Parceler
● Dagger2
● Timber
github.com/Polidea/OpenSourceBar-Android

60. Q&A

61. Thanks