android的一个编译问题

 错误信息：
Checking API: checkapi-last
(unknown): error 17: Field android.hardware.Camera.CameraInfo.CAMERA_FACING_BACK has changed value from 0 to 1
(unknown): error 17: Field android.hardware.Camera.CameraInfo.CAMERA_FACING_FRONT has changed value from 1 to 0
******************************
You have tried to change the API from what has been previously released in
an SDK.  Please fix the errors listed above.
*****************************
make: *** [out/target/common/obj/PACKAGING/checkapi-last-timestamp] Error 38
make: *** Waiting for unfinished jobs....
htmlDir not a directory: out/target/common/docs/gen
DroidDoc took 243 sec. to write docs to out/target/common/docs/doc-comment-check
原因是修改了framework中的变量的值，使得源码之前的api 的值与新的不一样，从而报错。
修改：
找到android api对应的文件，例如，android2.3 对应的api level 是9，则把9.xml（frameworks\base\api\）中的CAMERA_FACING_BACK/CAMERA_FACING_FRONT 修改成所想要的。
附：android api level:
  Android 3.0 - honeycomb
    Android 2.3.3 - API Level 10
    Android 2.3 - API Level 9
    2.2 - 8
    2.1 - 7
    2..0.1 - 6
    2.0 - 5
    1.6 - 4
    1.5 -3
    1.1 - 2
   Android 1.0 - API Level 1