Two-thumb Text Entry for Touchscreen Mobile Devices

Cilj ovoga rada bio je implementirati tipkovnicu za dvopalčani unos teksta na mobilnim napravama osjetljivim na dodir. Implementacija je postignuta korištenjem kružnih izbornika koji su organizirani u dva dijela, svaki u jednom kutu tipkovnice. Time pomažu pri korištenju tipkovnice za dvopalčani unos teksta. Tipkovnica je razvijena za operativni sustav Android verzije 4.0 (KitKat) pa nadalje. Kako bi se utvrdila korisnost tipkovnice sa kružnim izbornicima kao način unosa teksta, proveden je eksperiment na osam ispitanika u kojem ispitanici testiraju odnos razvijene tipkovnice naspram standardne QWERTY tipkovnice. Provedena su mjerenja za dobivanje brzine unosa teksta, ispravljanja znakova i iznos ukupne pogreške izražen u postotcima. Ispitanici su ocijenili sveukupni dojam tipkovnice na provedeno upitniku. Rezultatima eksperimenta utvrđeno je da razvijena tipkovnica nije brža od QWERTY tipkovnice, ali zato ima manju stopu pogreške unosa.The purpose of this thesis was to implement a keyboard for two-tumb text input on a touch-sensitive mobile device. Implementation is achieved by using circular menus that are organized in two parts, each in one corner of the keyboard, all to help the use of the two-tumb text input keyboard. The keyboard is developed for Android 4.0 (KitKat) and above. In order to determine the usefulness of the keyboard with circular menus as a text input method, an experiment was conducted on eight participantes whose task was to test the developed keyboard against the standard QWERTY keyboard. Measurements were made to get the rate of text input, character correction, and the amount of total error expressed in percentages. Respondents rated the overall impression of the keyboard on the questionnaire. The experiment results found that the developed keyboard is no faster than the QWERTY keyboard, but it has a lower input error rate