实现一个android平台下传感器支持的打气球游戏. 控制手机屏幕的空间朝向，来对准十字焦点，点击屏幕点破气球。（基于传感器的摄像机实现）-Achieve an android platform sensor support playing balloon games space control phone screen orientation to align cross-focus, tap the screen to point out the balloons. (Sensor-base