一个android手机上的物理弹球模拟程序，有助于理解android重力传感器的使用和2D绘图API-Android phone on a physical pinball simulation program, helps to understand the use of android gravity sensor and 2D drawing API

android应用程序，用手指触碰屏幕中的小球是小球移动-android app, touch the screen with your finger in the small ball is the ball moving

android游戏开发，闪避球小游戏，包含重力感应，画布，碰撞检测相关内容，初学者开发。-android game development, dodge ball game, including the gravity sensor, canvas, collision detection related content, beginners to develop.