android ScrollView 里面有一个文本TextView需要超出限度后滚动

        tv1.setMovementMethod(ScrollingMovementMethod.getInstance());
        tv1.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                if(event.getAction()==MotionEvent.ACTION_DOWN){
                    //通知父控件不要干扰
                    v.getParent().requestDisallowInterceptTouchEvent(true);
                }
                if(event.getAction()==MotionEvent.ACTION_MOVE){
                    //通知父控件不要干扰
                    v.getParent().requestDisallowInterceptTouchEvent(true);
                }
                if(event.getAction()==MotionEvent.ACTION_UP){
                    v.getParent().requestDisallowInterceptTouchEvent(false);
                }
                return false;
            }
        });