问Android - onTouch (ACTION_MOVE) -阻止视图退出屏幕

EN

case MotionEvent.ACTION_MOVE:
                RelativeLayout.LayoutParams moveParam = (RelativeLayout.LayoutParams) v.getLayoutParams();

                float maxTop = (mHeight-mPeepHole)/2;
                Log.d(TAG, "onTouch: maxTop = " + maxTop);
                if (moveParam.topMargin > maxTop || moveParam.topMargin < -(mHeight-mPeepHole)/2)
                {
                    Log.d(TAG, "onTouch: OUT OF BOUNDS HEIGHT");
                    // this fires when I need it to, all good.
                    // here is where I need some logic

                }

                if (moveParam.leftMargin > (mWidth-mPeepHole)/2 || moveParam.leftMargin < -(mWidth-mPeepHole)/2)
                {
                    Log.d(TAG, "onTouch: OUT OF BOUNDS WIDTH");
                    // and here...
                }

                moveParam.leftMargin = x - Position_X;
                moveParam.topMargin = y - Position_Y;
                moveParam.rightMargin = -500; // ignore this at present
                moveParam.bottomMargin = -500; // ignore this at present
                v.setLayoutParams(moveParam);

                break;