Android硬件设备检测
1. 摄像头

public boolean isCameraAvailable() {boolean ret = false;android.hardware.Camera mCameraDevice;try {mCameraDevice = android.hardware.Camera.open();ret = true;} catch (RuntimeException e) {}return ret;}

不过貌似不太正确，有待更新

另：启动无摄像头avd的方法
emulator-arm -avd nocam -webcam off -fake-camera off