Camera focus code

//my flags:

        static final int FOCUS_NOT_STARTED=1;
    static final int FOCUSING=2;
    static final int FOCUSING_SNAP_ON_FINISH=3;
    static final int FOCUS_SUCCESS=4;
    static final int FOCUS_FAIL=5;
    private int mFocusState=FOCUS_NOT_STARTED;

private void autoFocus()
    {
        //Confused about the condition:
        if(mFocusState==FOCUS_NOT_STARTED && isPreviewShowing && mCameraStatus!=SNAPSHOT_IN_PROGRESS)
        {
            mFocusState=FOCUSING;
            //mCamera.autoFocus(autoFocusCallback);
            mCamera.autoFocus(new YourAutoFocusCallback());
        }
    }

    private void cancelAutoFocus()
    {
        //Confused about the condition
        if(mCameraStatus==CAMERA_IDLE && (mFocusState==FOCUSING||mFocusState==FOCUS_SUCCESS||mFocusState==FOCUS_FAIL))
        {
            mCamera.cancelAutoFocus();
        }
        mFocusState=FOCUS_NOT_STARTED;
    }

    private void doSnap()
    {
        String mFocusMode=mCamera.getParameters().getFocusMode();
        if(mFocusMode.equals(Parameters.FOCUS_MODE_INFINITY)||mFocusMode.equals(Parameters.FOCUS_MODE_EDOF)||mFocusMode.equals(mFocusMode.equals(Parameters.FOCUS_MODE_FIXED))||mFocusState==FOCUS_SUCCESS||mFocusState==FOCUS_FAIL||mFocusState==FOCUS_NOT_STARTED)
        {
            //take a picture here
            //If the focus was not started,it will go through the focus states if the user holds on to the ShutterButton until the Camera focuses...
            //If it does come to do snap
            mCameraStatus=SNAPSHOT_IN_PROGRESS;
            mCamera.takePicture(null, null, pictureCallback);
        }
        else if(mFocusState==FOCUSING)
            mFocusState=FOCUSING_SNAP_ON_FINISH;

    }

    private void doFocus(boolean pressed)
    {
        //Pressed is set to true,if ShutterButton is half-pressed
        if(pressed)
            autoFocus();
        else
            cancelAutoFocus();
    }