Introduction

These days, mobile devices are packed with sensors, often including a gyroscope, magnetic, gravity, pressure, and/or temperature sensors, not to mention the touchscreen. This provides many new and exciting options to interact with your user. Through the sensors, you can determine three-dimensional device location and how the device itself is being used, such as shaking, rotation, tilt, and so on. Even the touchscreen offers many new input methods from just the simple click to gestures and multi-touch.

We'll start this chapter by exploring touchscreen interactions, starting with a simple click and long-press, then move on to detecting common gestures using the SimpleOnGestureListener class. Next we'll look at a multi-touch using the pinch-to-zoom gesture with ScaleGestureDetector.

This book is meant to offer a quick guide to adding features and functionality to your own applications. As such, it focuses on the code needed. It's highly recommended that you spend some time reading...