报错信息：java.lang.RuntimeException: startPreview failed
把setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);调用放在Activity的onCreate中
http://blog.csdn.net/davidbeckham2901/article/details/7696497
android 使用相机时出现了 startpreview 报错
http://www.apkbus.com/thread-462457-1-1.html
把setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);调用放在Activity的onCreate中