Text input on smartphones plays an increasingly important role in people’s daily lives. This study aims to explore the impact of posture and environment on the user experience of smartphone input methods. A combination of performance, subjective, and physiological measures is used to assess the user experience of 32 subjects (12 male, 20 female; 18–26 years old) using QWERTY and T9 input methods in walking and sitting postures in indoor and outdoor environments. The results showed that T9 was more effective for indoors and when sitting than QWERTY, while QWERTY was more effective than T9 for outdoors and when walking. In our tests, using T9 indoors while sitting showed a significantly higher performance than QWERTY, while using QWERTY outdoors while walking elicited significantly lower emotional arousal than T9. The findings allow us to propose both the optimal contexts in which to use particular input methods, and to highlight new approaches for improving the user experience of these devices.

智能手机上的文本输入在人们的日常生活中扮演着越来越重要的角色。这项研究旨在探讨姿势和环境对智能手机输入法用户体验的影响。在室内和室外环境中，使用QWERTY和T9输入法，结合性能，主观和生理学方法来评估32位受试者（12位男性，20位女性； 18-26岁）的用户体验。结果表明，T9在室内和坐着时比QWERTY更有效，而QWERTY在户外和坐着时比T9更有效。在我们的测试中，在室内坐着使用T9表现出比QWERTY更高的性能，而在户外使用QWERTY则在步行时引起的情绪唤起明显低于T9。