android 中如何获取camera当前状态

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/**  * 测试当前摄像头能否被使用  *  * @return  */ public static boolean isCameraCanUse() {     boolean canUse = true;     Camera mCamera = null;     try {         // TODO camera驱动挂掉,处理??         mCamera = Camera.open();     } catch (Exception e) {         canUse = false;     }     if(mCamera == null){         canUse = false;     }     if (canUse) {         mCamera.release();         mCamera = null;     }       return canUse; }