최상위 레이아웃에 버튼을 추가해서 버튼 클릭시 없어지도록 하고 싶은데 어쩌죠???

Question

public void mStart(View v) {
    startService(new Intent(this, AlwaysTopServiceTouch.class));
}

public void mStop(View v) {
    stopService(new Intent(this, AlwaysTopServiceTouch.class));
}

main 레이아웃에 1버튼이 mStart메소드로 누르면 아래 사진에 뜹니다 버튼은 제가 새로 추가한건데 

레이아웃 닫을 때는 2번째 버튼이 mStop메소드를 사용합니다 그래서 버튼을 생성하고 그 버튼 id값을 

객체화해서 클릭시 mStop메소드 내용을 그대로 했는데 애러가 걸리더라고요 어떻게 하면 되죠?

아래는 소스

public class AlwaysTopServiceTouch extends Service {
    private View mView;
    private WindowManager mManager;
    private WindowManager.LayoutParams mParams;

    private float mTouchX, mTouchY;
    private int mViewX, mViewY;

    private boolean isMove = false;

    private View.OnTouchListener mViewTouchListener = new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {

            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    isMove = false;

                    mTouchX = event.getRawX();
                    mTouchY = event.getRawY();
                    mViewX = mParams.x;
                    mViewY = mParams.y;

                    break;

                case MotionEvent.ACTION_UP:
                    if (!isMove) {
                        Toast.makeText(getApplicationContext(), "터치됨",
                                Toast.LENGTH_SHORT).show();
                    }

                    break;

                case MotionEvent.ACTION_MOVE:
                    isMove = true;

                    int x = (int) (event.getRawX() - mTouchX);
                    int y = (int) (event.getRawY() - mTouchY);

                    final int num = 5;
                    if ((x > -num && x < num) && (y > -num && y < num)) {
                        isMove = false;
                        break;
                    }

                    /**
                     * mParams.gravity에 따른 부호 변경
                     *
                     * LEFT : x가 +
                     *
                     * RIGHT : x가 -
                     *
                     * TOP : y가 +
                     *
                     * BOTTOM : y가 -
                     */
                    mParams.x = mViewX + x;
                    mParams.y = mViewY + y;

                    mManager.updateViewLayout(mView, mParams);

                    break;
            }

            return true;
        }
    };

    @Override
    public void onCreate() {
        super.onCreate();

        LayoutInflater mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mView = mInflater.inflate(R.layout.always_on_top_view_touch, null);

        mView.setOnTouchListener(mViewTouchListener);

        mParams = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_PHONE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                PixelFormat.TRANSLUCENT);
        mParams.gravity = Gravity.TOP | Gravity.LEFT;

        mManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mManager.addView(mView, mParams);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mView != null) {
            mManager.removeView(mView);
            mView = null;
        }
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}

public class AlwaysTopServiceNotTouch extends Service {
    private View mView;
    private WindowManager mManager;

    @Override
    public void onCreate() {
        super.onCreate();

        LayoutInflater mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mView = mInflater.inflate(R.layout.always_on_top_view_not_touch, null);

        WindowManager.LayoutParams mParams = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                // 항상 최상위 화면에 있도록 설정합니다
                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                // 터치 이벤트를 받지 않습니다
                WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                PixelFormat.TRANSLUCENT); // 투명

        mManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mManager.addView(mView, mParams);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        if (mView != null) {
            mManager.removeView(mView);
            mView = null;
        }
    }

    @Override
    public IBinder onBind(Intent arg0) {
        return null;
    }

}