以重力感測器輔助行動裝置之單手操作互動模式

Abstract

配備觸控式螢幕的智慧型手機越來越普及，然而有些使用情境下，例如雨天撐傘、提重物等，使用者只有一手可以操作手機。在這樣的單手操作的互動方式下，使用者最常用拇指來操作觸碰螢幕。如果螢幕的長度或寬度比拇指還長，畫面上離指尖遠的元件 (far-targets) 就很難碰觸到。大多數的智慧型手機都有內建三軸加速感應器 (accelerometer) 以用來控制畫面的旋轉方向。我們使用手機內建的三軸加速感應器來偵測手指在螢幕後方的觸碰動作，偵測到此動作之後，使螢幕顯示元件排列方式改變，以讓拇指在單手操作手機時更容易觸及那些離姆指尖很遠的元件。

In one-handed interaction of mobile devices, touch-screen areas far from users’ thumbs may be difficult to reach. We propose iReach, which uses the accelerometer to sense motion gestures of the device-holding hand. We propose three UI layout change manners that make distant targets reachable: Screen-Shifting, Scaling-Down and Sector-alignment. After detecting the motion gesture of holding hand, one of the UI layout change is triggered. Through a pilot study, we compare those UI layout change manner. Participants performed target-selection tasks using small (4.3-inch display) and large (5.3-inch display) mobile phones. Our results show that Sector-Shaped Aligning is preferred by users when using large-screen smartphones.