A short presentation of technologies which we use at UPTECH. For more info and examples see https://uptech.

1. Android Getting Started
The UPTech way

2. What’s on the list?
Basic Libraries
Dependency Injection with Dagger 2
RxAndroid
Custom Views FTW
The Future: Kotlin

3. Basic Libraries
Butterknife
Retrolambda
REST Trio: Retrofit, OkHttp, Gson
Image Loading: Glide, Fresco
Realm

4. Dependency Injection with Dagger 2
class ApiService {
public void uploadPhoto(String user, File file) {
OkHttpClient client = new OkHttpClient();
Gson gson = new Gson();
Request request = // TODO build a post request
client.newCall(request).execute();
}
}

5. Dependency Injection with Dagger 2
class ApiService {
Gson gson = new Gson();
OkHttpClient client = new OkHttpClient()
public void uploadPhoto(String user, File file) {
Request request = // TODO build a post request
client.newCall(request).execute();
}
}

6. Dependency Injection with Dagger 2
class ApiService {
Gson gson;
OkHttpClient client;
public ApiService(OkHttpClient client, Gson gson) {
this.client = client;
this.gson = gson;
}
public void uploadPhoto(String user, File file) {
Request request = // TODO build a post request
client.newCall(request).execute();
}
}

7. Dependency Injection with Dagger 2
OkHttpClient client = new OkHttpClient();
Gson gson = new Gson();
ApiService apiService = new ApiService(client, gson);
apiService.uploadPhoto("UPTechTeam", file);

8. Dependency Injection

9. OkHttpClient client = new OkHttpClient();
Gson gson = new Gson();
ApiService apiService = new ApiService(client, gson);
RealmConfiguration config = new RealmConfiguration.Builder(context)
.deleteRealmIfMigrationNeeded()
.build();
Realm.setDefaultConfiguration(config);
Realm realm = Realm.getDefaultInstance();
Preferences preferences = new Preferences(context);
AccountManager accountManager = new AccountManager(apiService, database, preferences);
accountManager.getUser();
Dependency Injection

10. @Inject
AccountManager accountManager;
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Application.appComponent().inject(this);
accountManager.getUser()
}
Dependency Injection with Dagger 2

11. api.registerWithEmail(email, password, new Callback<RegisterResponse>() {
@Override
public void onResponse(Call<RegisterResponse> call, Response<RegisterResponse> response) {
if (response.isSuccess()) {
api.getUser(response.token, new Callback<User>() {
@Override
public void onResponse(Call<User> call, Response<User> response) {
if (response.isSuccess()) {}
database.saveUser()
} else {
showError(...);
}
}
@Override
public void onFailure(Call<User> call, Throwable t) {
showError(...);
}
});
} else {
if (ErrorResponse.isAlreadyRegistered(response.getErrorBody())) {
api.login(email, password, new Callback<LoginResponse>() {
@Override
public void onResponse(Call<LoginResponse> call, Response<LoginResponse> response) {
preferences.saveToken(response);
api.getUser(response.token, new Callback<User>() {
@Override
public void onResponse(Call<User> call, Response<User> response) {
RxAndroid

12. public Observable<UserInfo> registerAndLogin(String email, String password) {
return apiService.registerWithEmail(new RegisterRequest(email, password))
.flatMap(userInfo -> apiService.signInWithEmail(new SignInRequest(email, password)))
.doOnNext(signInResponse -> preferences.saveAccessToken(signInResponse.accessToken))
.onErrorResumeNext(e -> ErrorResponse.isAlreadyRegistered(e) ? apiService.signInWithEmail(new
SignInRequest(email, password)) : errorObservable(e))
.flatMap(ignore -> getUser())
.doOnNext(user -> database.saveUser(user));
}
RxAndroid

13. >> Improving UX with RX
RxAndroid

14. >> Thanks!
UPTech